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Re: X-Y to VGA/USB converter

Bill Ress
 

Hi Chris,

I must have missed the reference. I have cobbled up something for my 141T series but really need something much better. Could you send me the reference link?

Thanks...Bill

On 9/1/2011 7:34 AM, Christophe Huygens wrote:
These are available, I think this was discussed before.

Xtof

On 01/09/11 16:08, Kuba Ober wrote:
>
> I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
> VGA/USB converter for use with various instruments where existing X-Y
> displays are dying.
>
> I'm looking for input about the required specs and functionality:
>
> 1. Bandwidth
> 2. Input voltage ranges
> 3. Required accuracy on voltage-to-coordinate transformation
> 4. Requirements for sequence triggers to change colors: for example,
> if a display
> draws some nomenclature, and then goes on to draw traces, it'd be good
> to have a way
> of setting it up to switch colors automatically on certain events (X,Y
> in a certain
> area, retrace on X, etc).
> 5. Other inputs needed for interfacing with particular instruments
> 6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
> 7. Persistence adjustments: how many rectangular areas should there be
> (upper limit),
> each with its own persistence value.
>
> I'm also wondering if there are any spectrum analyzers where display
> accuracy would benefit
> from taking some IF frequency/ies as the X coordinate instead of a
> voltage. Counting frequency
> is easy. For my 7L14 I was thinking of using both IFs as the inputs;
> that would improve
> the accuracy of the display and would make it fixed-frequency.
>
> I don't have any HP SAs or other instruments like that, all I have is
> a 7L14 spec an.
>
> I'd try to make it as low cost as possible of course, but specs come
> first.
>
> Cheers, Kuba Ober
>
>

Disclaimer:


Re: HP 343A V.H.F. noise source

 

On 09/01/2011 12:49 PM, gianfrancocanale wrote:

Hi
I have found in a flee market the A.M. device.
Nice and with the the noise generator tube.
Now i want to build the power supply it.
The tube is not marked.
The HP catalogue says that the ENR is 5.2 dB
with a anode current of 3.1 mA.
Does anybody know the type of the tube used.
Thanks for the help
Gianfranco

_ <!-- #ygrp-mkp { border: 1px solid #d8d8d8; font-family: Arial;
margin: 10p
The tube is a 7-pin miniature directly heated vacuum tube
diode, type 5722. The noise is thermally limited by the
temperature of the cathode (filament). The plate current
is determined by adjusting the filament voltage.

The excess noise in a 50 ohm system is determined as

NFdb = 10 * LOG_10 (20 * I * R)

where: I = Plate current in Amps, R = generator resistance,
50 Ohms in this case. For simplicity, where you have a 50
ohm system, the calculation reduces to

NFdb = 10 * LOG_10 I,mA

There is a nice schematic diagram of a 5722 noise
generator at



Make that source and terminating impedance 50 ohms for
the USA, please! (Germans used to use 60 ohm test equipment,
probably as a compromise between 50 and 75 ohms. Old R&S
test equipment was designed for 60 ohms.)

Several manufacturers made these noise generators. They
could be used one of two ways: Either set the plate
current for a known ENR and then measure K-factor, or,
with plate current off, set a noise reference on a
receiver, then crank in 3 dB of attenuation in the
reciever IF, and increase the plate current until the
noise reference was the same value; read the plate current
and calculate. (You normally didn't have to; the current
meter was calibrated in noise figure.) Here's one
example:



AIL made an instrument like that--I think it was a 7005.

Because of unavoidable lead lengths, this kind of
instrument was good only to about 500 MHz, and there were
correction curves to apply above some VHF frequency,
usually around 100 MHz.

Please note that the specified current and excess noise
contain round-off errors. 3.1mA would produce 4.91 dB
ENR. It would actually take just a bit over 3.3mA to
achieve 5.2dB ENR.

doug, WA2SAY

--
Blessed are the peacemakers...for they shall be shot at from both sides. --A. M. Greeley
Re: X-Y to VGA/USB converter

 

On 09/01/2011 10:43 AM, Peter Reilley wrote:
Perhaps another approach might be easier. Use a PC and an A/D
input device. You could create an application that read 2 analog
inputs and displayed them in an X/Y manner in a window. You would
not have to worry about screen resolution. The trick is finding
an A/D input device with at least 2 input channels. I was thinking
an audio input device but I don't think that they handle DC.

Pete.



----- Original Message -----
From: "Kuba Ober"<ober.14@...>
To:<hp_agilent_equipment@...>
Sent: Thursday, September 01, 2011 10:17 AM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter


Further thoughts: Now I think that the resolution will have to be
adjustable to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when
horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios,
so even if vertically
it's 768, horizontally it may need to be more than that. I think that the
device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly
analog inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory
bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a
display
draws some nomenclature, and then goes on to draw traces, it'd be good to
have a way
of setting it up to switch colors automatically on certain events (X,Y in
a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that
would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a
7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober
/snip/

Look up Dataq Instruments. Look for model DI-194RS. It has 4 analog input channels.

--doug

--
Blessed are the peacemakers...for they shall be shot at from both sides. --A. M. Greeley
Re: HP 343A V.H.F. noise source

 

The tube should be a 5722. See for information.


Stuart K6YAZ
Los Angeles, California

-----Original Message-----
From: gianfrancocanale <gf.canale@...>
To: hp_agilent_equipment <hp_agilent_equipment@...>
Sent: Thu, Sep 1, 2011 9:49 am
Subject: [hp_agilent_equipment] HP 343A V.H.F. noise source





Hi
I have found in a flee market the A.M. device.
Nice and with the the noise generator tube.
Now i want to build the power supply it.
The tube is not marked.
The HP catalogue says that the ENR is 5.2 dB
with a anode current of 3.1 mA.
Does anybody know the type of the tube used.
Thanks for the help
Gianfranco









[Non-text portions of this message have been removed]
Re: HP 343A V.H.F. noise source

 

If memory serves me right it is a 5722. Regards - Mike



Mike B. Feher, N4FS

89 Arnold Blvd.

Howell, NJ, 07731

732-886-5960



From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of gianfrancocanale
Sent: Thursday, September 01, 2011 12:50 PM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] HP 343A V.H.F. noise source





Hi
I have found in a flee market the A.M. device.
Nice and with the the noise generator tube.
Now i want to build the power supply it.
The tube is not marked.
The HP catalogue says that the ENR is 5.2 dB
with a anode current of 3.1 mA.
Does anybody know the type of the tube used.
Thanks for the help
Gianfranco
HP 343A V.H.F. noise source

 

Hi
I have found in a flee market the A.M. device.
Nice and with the the noise generator tube.
Now i want to build the power supply it.
The tube is not marked.
The HP catalogue says that the ENR is 5.2 dB
with a anode current of 3.1 mA.
Does anybody know the type of the tube used.
Thanks for the help
Gianfranco
Re: X-Y to VGA/USB converter

EB4APL
 

I found the URL, take a look at it:


Regards,
Ignacio

On 01/09/2011 17:49, EB4APL wrote:
Pete,

You are right, but some guys had modified theirs easily for making DC
coupled low frequency software scopes and the results had been encouraging.
Since the internal A/D can handle DC, they removed the input blocking
capacitors and added a (dual) op-amp as level shiftter, accounting for
the A/D converters are biased to Vdd/2. A DC balance pot completes the
figure.

If someone is interested I think that I can find the web page with
detailed instructions.

Regards,
Ignacio


El 01/09/2011 16:43, PeterReilley escribi???:
Perhaps another approach might be easier. Use a PC and an A/D
input device. You could create an application that read 2 analog
inputs and displayed them in an X/Y manner in a window. You would
not have to worry about screen resolution. The trick is finding
an A/D input device with at least 2 input channels. I was thinking
an audio input device but I don't think that they handle DC.

Pete.



----- Original Message -----
From: "Kuba Ober"<ober.14@...>
To:<hp_agilent_equipment@...>
Sent: Thursday, September 01, 2011 10:17 AM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter


Further thoughts: Now I think that the resolution will have to be
adjustable to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when
horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios,
so even if vertically
it's 768, horizontally it may need to be more than that. I think that the
device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly
analog inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory
bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a
display
draws some nomenclature, and then goes on to draw traces, it'd be good to
have a way
of setting it up to switch colors automatically on certain events (X,Y in
a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that
would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a
7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober

------------------------------------

Yahoo! Groups Links



------------------------------------

Yahoo! Groups Links



------------------------------------

Yahoo! Groups Links
Re: X-Y to VGA/USB converter

EB4APL
 

Pete,

You are right, but some guys had modified theirs easily for making DC coupled low frequency software scopes and the results had been encouraging.
Since the internal A/D can handle DC, they removed the input blocking capacitors and added a (dual) op-amp as level shiftter, accounting for the A/D converters are biased to Vdd/2. A DC balance pot completes the figure.

If someone is interested I think that I can find the web page with detailed instructions.

Regards,
Ignacio


El 01/09/2011 16:43, PeterReilley escribi???:

Perhaps another approach might be easier. Use a PC and an A/D
input device. You could create an application that read 2 analog
inputs and displayed them in an X/Y manner in a window. You would
not have to worry about screen resolution. The trick is finding
an A/D input device with at least 2 input channels. I was thinking
an audio input device but I don't think that they handle DC.

Pete.



----- Original Message -----
From: "Kuba Ober"<ober.14@...>
To:<hp_agilent_equipment@...>
Sent: Thursday, September 01, 2011 10:17 AM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter


Further thoughts: Now I think that the resolution will have to be
adjustable to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when
horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios,
so even if vertically
it's 768, horizontally it may need to be more than that. I think that the
device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly
analog inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory
bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a
display
draws some nomenclature, and then goes on to draw traces, it'd be good to
have a way
of setting it up to switch colors automatically on certain events (X,Y in
a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that
would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a
7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober


------------------------------------

Yahoo! Groups Links




------------------------------------

Yahoo! Groups Links
Re: Favorite bad capacitor debugging techniques?

 

Hi David:

A shorted cap across a power supply rail causes the fuse blowing that you are seeing. This is different than a cap with high ESR that causes problems similar to removing the cap. Many (most?) of the ESR problems are related to Capacitor plague.


Tantalum caps tend to fail as shorts and I think that's the problem on the board you have. Measuring very low resistance requires the use of an AC test method to avoid thermoelectric effects, see: where below 50 milli Ohms DC just did not work, even with a Kelvin connection. I think the ESR-Cap meter can detect shorted Tantalum caps, but I haven't run across any using it. I suspect that the capacitance reading will be way off while the ESR reading may be reasonable. The Heathkit GC-1000 Clock did not have any shorted Tantalum capacitors.


Shameless plug. The Russian made ESR-Cap meter I sell also measures both ESR & capacitance (it has a 2 line display).
Cap: 0.2 to 60,000 uF
Res: 0.00 to 99


Is there a way to force a Tantalum cap to fail as a short without causing it to explode?
If anyone has shorted Tantalum caps to send me, I'd like to make some measurements on them.

Have Fun,

Brooke Clarke




hp_agilent_equipment@... wrote:

Re: Favorite bad capacitor debugging techniques?
Re: X-Y to VGA/USB converter

 

Perhaps another approach might be easier. Use a PC and an A/D
input device. You could create an application that read 2 analog
inputs and displayed them in an X/Y manner in a window. You would
not have to worry about screen resolution. The trick is finding
an A/D input device with at least 2 input channels. I was thinking
an audio input device but I don't think that they handle DC.

Pete.

----- Original Message -----
From: "Kuba Ober" <ober.14@...>
To: <hp_agilent_equipment@...>
Sent: Thursday, September 01, 2011 10:17 AM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter


Further thoughts: Now I think that the resolution will have to be adjustable to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios, so even if vertically
it's 768, horizontally it may need to be more than that. I think that the device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly analog inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to VGA/USB converter for use with various instruments where existing X-Y displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a display
draws some nomenclature, and then goes on to draw traces, it'd be good to have a way
of setting it up to switch colors automatically on certain events (X,Y in a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be (upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a 7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come first.

Cheers, Kuba Ober



------------------------------------

Yahoo! Groups Links
Re: X-Y to VGA/USB converter

 

These are available, I think this was discussed before.

Xtof


On 01/09/11 16:08, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example,
if a display
draws some nomenclature, and then goes on to draw traces, it'd be good
to have a way
of setting it up to switch colors automatically on certain events (X,Y
in a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs;
that would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is
a 7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come
first.

Cheers, Kuba Ober


Disclaimer:

Re: X-Y to VGA/USB converter

 

Further thoughts: Now I think that the resolution will have to be adjustable to fit to popular
widescreen LCD monitors. A 1024x768 output does not look too good when horizontally stretched.
I think the output will have to be matchable to common LCD aspect ratios, so even if vertically
it's 768, horizontally it may need to be more than that. I think that the device should read the
DDC information from the monitor and use it for initial setting.

I think that having a DVI output would also be nice, since supposedly analog inputs on monitors
are going the way of the dodo. DVI shouldn't be an issue since memory bandwidths to a DAC and to
the DVI are obviously same.

Cheers, Kuba

On Sep 1, 2011, at 10:08 AM, Kuba Ober wrote:

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to VGA/USB converter for use with various instruments where existing X-Y displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a display
draws some nomenclature, and then goes on to draw traces, it'd be good to have a way
of setting it up to switch colors automatically on certain events (X,Y in a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be (upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a 7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come first.

Cheers, Kuba Ober
X-Y to VGA/USB converter

 

I'm thinking of biting the bullet and making an affordable X-Y-(Z) to VGA/USB converter for use with various instruments where existing X-Y displays are dying.

I'm looking for input about the required specs and functionality:

1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example, if a display
draws some nomenclature, and then goes on to draw traces, it'd be good to have a way
of setting it up to switch colors automatically on certain events (X,Y in a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be (upper limit),
each with its own persistence value.

I'm also wondering if there are any spectrum analyzers where display accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs; that would improve
the accuracy of the display and would make it fixed-frequency.

I don't have any HP SAs or other instruments like that, all I have is a 7L14 spec an.

I'd try to make it as low cost as possible of course, but specs come first.

Cheers, Kuba Ober
Re: Which HP spectrum analzyer is structurally most similar to that of HP 8565A?

 

I think that following basic rules is enough: fully shielded enclosure, cable/connector
shields terminated over 360 degrees to the case (NOT the PCB!!, google Pin 1 Problem),
common mode chokes on all connections, ground plane on the component side of the PCB.
Using a linear regulator for the CPU's voltage(s) would help too, otherwise you have to
deal with CPU harmonics, USB harmonics, and regulator's that will likely mix with everything
else.

That should cover a lot of issues already methinks.

Cheers, Kuba

On Aug 27, 2011, at 12:52 AM, Jim Cotton wrote:



The real fun is keeping all the digital stuff that you add OUT of the existing analog
system...

Jim Cotton
n8qoh

________________________________
From: Amos Ku <amosku@...>
To: "hp_agilent_equipment@..." <hp_agilent_equipment@...>
Sent: Friday, August 26, 2011 2:41 PM
Subject: Re: [hp_agilent_equipment] Which HP spectrum analzyer is structurally most similar to that of HP 8565A?


Tim,

This email is to respond to your earlier email about having some VGA kit to replace the CRT.

I have an idea. Since all the display section does is to take the signal to be display (y-axis) and sweep the screen with sweep signal (x-axis), I can make up a digitized circuit that does the same thing as what CRT will do and connect the output to a LCD module that fits right into the window of HP 8565A, I can have a cheap solution for replacement of CRT tube circuit.

My idea came from here:

.

About the normalizer part. I am thinking about build up something based on the same design of normalizer in SMD and place the circuits inside the large cavity where CRT is in. I can then have all the functions I need in the same box. I am thinking about changing the weird AUX connectors to some easy to get connectors from Digikey (same pin numbers, same dimensions.)

Amos

[Non-text portions of this message have been removed]
Re: Problems with HP8753C networkanalyzer

 

Hi there Jose thanks for your mail. I tried to read your nice presentation and did some tests. I can do Cal 44 cal 45 and they pass that. but when I do Cal 48 it fails. And actually the failure got worse. I tried to work open loop to se the offset and I se a HUGE offset. setting to 300khz we should se something from 1.3-6Mhz I get 165Mhz there and going to 30Mhz give me 190Mhz and 40Mhz over 200Mhz. So what would you suggest me to do. 73 Peter
To: hp_agilent_equipment@...
From: eb5agv@...
Date: Wed, 31 Aug 2011 10:00:35 +0200
Subject: Re: [hp_agilent_equipment] Problems with HP8753C networkanalyzer




























Hi Peter,



I went through a similar problem (not exactly the same, but the error

was the same) and was able to fix it by an internal source auto-calibration.



Please, check my WEB at for more

information about what I did and the results. If you have any doubt,

just ask :-)



I hope it helps!



Regards,



JOSE



At 09:54 31/08/2011, you wrote:



hi group I have a HP8753C analyzer option 6 (6Ghz) that has a
HP85047 testset. I get the following error when power on. No IF
found check R input levelPhase lock lost when I se my display I
have not strait line under 90Mhz. There is like noise on the line
there. I did some tests in CW mode and se I loose my phase lock
going under 87Mhz. Looking on the Cw signal with a spectrumanalyzer
I se a very unstable signal. So when going below 87Mhz the display
say Phase-lock lost. Going above make a stable frequency signal.
Measurering the power out of the source (level set to 0dBm out say
around -11dBm but that is after a loss of 6dB in a powersplitter
(hp11667). so output od source is around -5dBm measured at 1Ghz.
Level is flat over the range. What can be the root course for that
problem. Best regards Peter Hansen OZ1LPR


--

73 EB5AGV - JOSE V. GAVILA - IM99sm La Canyada - Valencia(SPAIN)

Radio and Test Equipment.......

RadioRepair BLOG...............

8648C Sig Gen 1E5 Option

 

Does anyone know details or availability of the 1E5 high stability timebase option for the HP 8648C 3.2 GHz signal generator?

I have an 8648C without this option and would consider adding the option if it can be found or substituted.

--
Best wishes,

Larry McDavid W6FUB
Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland)
Re: Replacement for 08565-60084 attenuator in HP 8565A...

Amos Ku
 

Stuart,

Sorry, forgot to tell you. I am also an design engineer working in an R&D company. On my job, I need to develop all level of electronics. I would like to have some decent equipment that I can do some measurements. I do not want to always wait until I come to work everyday. I want to be able to do some at the leisure of my home.

On top of my job, I am also an ambitious hobbyist who wishes to build and test things at home. I think spectrum analyzer is a good tool to have.

Yes, you are right. I do not need to have it. However, I just came across a broken one on ebay and I thought getting one may help me to do more interesting research of my own and help to boost my growth in my job related knowledge.

Everyone has different needs and some are satisfied with low end equipment. Some may be a little ambitious and want to always go a little further than most other people.

Amos



________________________________
From: "stuartl73@..." <stuartl73@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 2:31 PM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...


?
Amos, in all honesty I don't know why you want a spectrum analyzer. They do two things; measure frequency (to some accuracy up to and including frequency counter resolution) and measure RF power or voltage, across a known low return loss impedance, again to some accuracy depending on the age and cost of the analyzer. In all but the newest and most expensive analyzers, time is not displayed against frequency and amplitude.

You now state that you are willing to give up the ability to accurately measure the signal level. You might as well buy an inexpensive frequency counter and RF power meter. That costs less and takes up a lot less bench space .For my needs, I would rather have my Spectrum Analyzer.

Stuart K6YAZ

Los Angeles, California

-----Original Message-----
From: Amos Ku <amosku@...>
To: hp_agilent_equipment <hp_agilent_equipment@...>
Sent: Wed, Aug 31, 2011 1:12 pm
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Stuart,

I think before I can afford that attenuator, probably I may just calculate the loss and attenuation and buy appropriate attenuators when they are needed each time...

Amos

________________________________
From: "stuartl73@..." <stuartl73@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 12:08 PM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Amos, what you are dealing with is an attenuator specifically made for that one instrument. They are in short supply and are crucial for the analyzer to work properly and to display the actual input level on both the screen and readout LED.
Anything but the proper part will degrade the instrument, and possibly create a "Frankenstein's monster", with outboard "fixes". I hope you realize that you are involved in a possibly very expensive and time consuming project; and may have to settle for "good enough" rather than a 100% reliable, accurate instrument.

Stuart

-----Original Message-----
From: Amos Ku <amosku@...>
To: hp_agilent_equipment@... <hp_agilent_equipment@...>
Sent: Wed, Aug 31, 2011 11:24 am
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Will,

Yeah. I have thought about this option too. But that means I have to give up the ability to internally choose attenuation.

Right now, I am facing the issue of choosing the cable that go between the RF connector and the coax switch (K2). No experience on choosing or specifying one before.....

Amos

________________________________
From: "w0eom@..." <w0eom@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 8:50 AM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Amos - you can use an external atten. to keep the input signal below +20
dbm.

Will

In a message dated 8/31/2011 1:06:30 A.M. Pacific Daylight Time,
amosku@... writes:

Hi all,

With help from friends in this group, I have found the schematics in the
manual, and I also identified the five missing parts in the HP 8565A that I
cheaply bought from ebay.

Now, I found it difficult to find a cheap source for 08565-60084
attenuator.

Does any one know the replacement part for 08565-60084 (A34, RF
attenuator) in HP 8565A? It does not seem to be easy to obtain this attenuator
($400). I wonder if anyone knows any information about this attenuator.

If obtaining one is difficult, what options do I have?

Also, I wonder if this attenuator is really needed to make the system work.

Thanks in advance.

Amos



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]






[Non-text portions of this message have been removed]
Re: Replacement for 08565-60084 attenuator in HP 8565A...

 

Amos, in all honesty I don't know why you want a spectrum analyzer. They do two things; measure frequency (to some accuracy up to and including frequency counter resolution) and measure RF power or voltage, across a known low return loss impedance, again to some accuracy depending on the age and cost of the analyzer. In all but the newest and most expensive analyzers, time is not displayed against frequency and amplitude.

You now state that you are willing to give up the ability to accurately measure the signal level. You might as well buy an inexpensive frequency counter and RF power meter. That costs less and takes up a lot less bench space .For my needs, I would rather have my Spectrum Analyzer.

Stuart K6YAZ

Los Angeles, California

-----Original Message-----
From: Amos Ku <amosku@...>
To: hp_agilent_equipment <hp_agilent_equipment@...>
Sent: Wed, Aug 31, 2011 1:12 pm
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...





Stuart,

I think before I can afford that attenuator, probably I may just calculate the loss and attenuation and buy appropriate attenuators when they are needed each time...

Amos

________________________________
From: "stuartl73@..." <stuartl73@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 12:08 PM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...


Amos, what you are dealing with is an attenuator specifically made for that one instrument. They are in short supply and are crucial for the analyzer to work properly and to display the actual input level on both the screen and readout LED.
Anything but the proper part will degrade the instrument, and possibly create a "Frankenstein's monster", with outboard "fixes". I hope you realize that you are involved in a possibly very expensive and time consuming project; and may have to settle for "good enough" rather than a 100% reliable, accurate instrument.

Stuart

-----Original Message-----
From: Amos Ku <amosku@...>
To: hp_agilent_equipment@... <hp_agilent_equipment@...>
Sent: Wed, Aug 31, 2011 11:24 am
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Will,

Yeah. I have thought about this option too. But that means I have to give up the ability to internally choose attenuation.

Right now, I am facing the issue of choosing the cable that go between the RF connector and the coax switch (K2). No experience on choosing or specifying one before.....

Amos

________________________________
From: "w0eom@..." <w0eom@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 8:50 AM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Amos - you can use an external atten. to keep the input signal below +20
dbm.

Will

In a message dated 8/31/2011 1:06:30 A.M. Pacific Daylight Time,
amosku@... writes:

Hi all,

With help from friends in this group, I have found the schematics in the
manual, and I also identified the five missing parts in the HP 8565A that I
cheaply bought from ebay.

Now, I found it difficult to find a cheap source for 08565-60084
attenuator.

Does any one know the replacement part for 08565-60084 (A34, RF
attenuator) in HP 8565A? It does not seem to be easy to obtain this attenuator
($400). I wonder if anyone knows any information about this attenuator.

If obtaining one is difficult, what options do I have?

Also, I wonder if this attenuator is really needed to make the system work.

Thanks in advance.

Amos



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]









[Non-text portions of this message have been removed]
Re: Replacement for 08565-60084 attenuator in HP 8565A...

Amos Ku
 

Stuart,

I think before I can afford that attenuator, probably I may just calculate the loss and attenuation and buy appropriate attenuators when they are needed each time...


Amos



________________________________
From: "stuartl73@..." <stuartl73@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 12:08 PM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...


?
Amos, what you are dealing with is an attenuator specifically made for that one instrument. They are in short supply and are crucial for the analyzer to work properly and to display the actual input level on both the screen and readout LED.
Anything but the proper part will degrade the instrument, and possibly create a "Frankenstein's monster", with outboard "fixes". I hope you realize that you are involved in a possibly very expensive and time consuming project; and may have to settle for "good enough" rather than a 100% reliable, accurate instrument.

Stuart

-----Original Message-----
From: Amos Ku <amosku@...>
To: hp_agilent_equipment@... <hp_agilent_equipment@...>
Sent: Wed, Aug 31, 2011 11:24 am
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Will,

Yeah. I have thought about this option too. But that means I have to give up the ability to internally choose attenuation.

Right now, I am facing the issue of choosing the cable that go between the RF connector and the coax switch (K2). No experience on choosing or specifying one before.....

Amos

________________________________
From: "w0eom@..." <w0eom@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 8:50 AM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Amos - you can use an external atten. to keep the input signal below +20
dbm.

Will

In a message dated 8/31/2011 1:06:30 A.M. Pacific Daylight Time,
amosku@... writes:

Hi all,

With help from friends in this group, I have found the schematics in the
manual, and I also identified the five missing parts in the HP 8565A that I
cheaply bought from ebay.

Now, I found it difficult to find a cheap source for 08565-60084
attenuator.

Does any one know the replacement part for 08565-60084 (A34, RF
attenuator) in HP 8565A? It does not seem to be easy to obtain this attenuator
($400). I wonder if anyone knows any information about this attenuator.

If obtaining one is difficult, what options do I have?

Also, I wonder if this attenuator is really needed to make the system work.

Thanks in advance.

Amos

[Non-text portions of this message have been removed]








[Non-text portions of this message have been removed]
Re: Replacement for 08565-60084 attenuator in HP 8565A...

 

Amos; You may learn a lot by working on this project, but the knowledge and results may not be what you expected. I've had to abandon similar projects when I replaced one suspect part only to find out there was another problem revealed by the replacement. When you get to the point where a part or assembly isn't available at a reasonable price, or time-frame, where do you go?
The 8656A represents the state of the art, at that time, and relies on a lot of specialized components working reliably together. HP had a real advantage because they designed and built a unique RF attenuator. They were so good that many were sold to other companies to use in their products. My Gigatronics model 600 signal generator (10 to 8000 MHz) uses a special HP programmable attenuator, and is a major factor in it's success.

Stuart
K6YAZ
Los Angeles, California

-----Original Message-----
From: Amos Ku <amosku@...>
To: hp_agilent_equipment@... <hp_agilent_equipment@...>
Sent: Wed, Aug 31, 2011 12:36 pm
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...





Stuart,

Good reasoning. This is my dilemma: 1. To get the system up and working by any condition, 2. Or spend more money to get the complete system. Unless I can run into someone sells cheap on ebay, I may have to get stuck with this attenuator if I am choosing option 2.

Amos

________________________________
From: "stuartl73@..." <stuartl73@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 12:08 PM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...


Amos, what you are dealing with is an attenuator specifically made for that one instrument. They are in short supply and are crucial for the analyzer to work properly and to display the actual input level on both the screen and readout LED.
Anything but the proper part will degrade the instrument, and possibly create a "Frankenstein's monster", with outboard "fixes". I hope you realize that you are involved in a possibly very expensive and time consuming project; and may have to settle for "good enough" rather than a 100% reliable, accurate instrument.

Stuart

-----Original Message-----
From: Amos Ku <amosku@...>
To: hp_agilent_equipment@... <hp_agilent_equipment@...>
Sent: Wed, Aug 31, 2011 11:24 am
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Will,

Yeah. I have thought about this option too. But that means I have to give up the ability to internally choose attenuation.

Right now, I am facing the issue of choosing the cable that go between the RF connector and the coax switch (K2). No experience on choosing or specifying one before.....

Amos

________________________________
From: "w0eom@..." <w0eom@...>
To: hp_agilent_equipment@...
Sent: Wednesday, August 31, 2011 8:50 AM
Subject: Re: [hp_agilent_equipment] Replacement for 08565-60084 attenuator in HP 8565A...

Amos - you can use an external atten. to keep the input signal below +20
dbm.

Will

In a message dated 8/31/2011 1:06:30 A.M. Pacific Daylight Time,
amosku@... writes:

Hi all,

With help from friends in this group, I have found the schematics in the
manual, and I also identified the five missing parts in the HP 8565A that I
cheaply bought from ebay.

Now, I found it difficult to find a cheap source for 08565-60084
attenuator.

Does any one know the replacement part for 08565-60084 (A34, RF
attenuator) in HP 8565A? It does not seem to be easy to obtain this attenuator
($400). I wonder if anyone knows any information about this attenuator.

If obtaining one is difficult, what options do I have?

Also, I wonder if this attenuator is really needed to make the system work.

Thanks in advance.

Amos



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]









[Non-text portions of this message have been removed]
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