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Re: HP8568B Display Intensity?

 

--- In hp_agilent_equipment@..., "david_woodhead"
<david_woodhead@...> wrote:

Just acquired an 8568B and have questions....

The graticule is a little out of focus and appears to be over
intensified. The trace and on screen characters are very crisp.
When I
turn down the intensity, the graticule is visible long after the
trace
and text have vanished.

Are there seperate intensity commands for the trace and characters?

I also note that trace B is considerably dimmer than trace A. Is
there
an adjustment for trace B intensity?

Hoping this is not a CRT problem.

David.
Here's a little more info:

The front panel command to intensify the graticule for photography
works but all I see is the graticule. It completely dims text and
traces. Perhaps my problem is that text and traces are much dimmer
than they should be and the graticule intensity is working correctly.

The manual is not the easiest thing to understand so I'd appreciate
any input?

Thanks,

David.
First mixer for 8555A [141T Spectrum Analyzer System]

Don Collie
 

Hi Group,
I`d like to obtain one first mixer for my new/old
H/P 8555A plug - in for my 141T Spec/An. Does anyone have one that they don`t want? Ideally, I`d like
a fully working one, but non - working would be OK
too.
[The H/P part number is : 5086 - 7177]

Thanking you!.................................Don Collie jnr.

P.S. : My email is : donmer@...
HP8568B Display Intensity?

 

Just acquired an 8568B and have questions....

The graticule is a little out of focus and appears to be over
intensified. The trace and on screen characters are very crisp. When I
turn down the intensity, the graticule is visible long after the trace
and text have vanished.

Are there seperate intensity commands for the trace and characters?

I also note that trace B is considerably dimmer than trace A. Is there
an adjustment for trace B intensity?

Hoping this is not a CRT problem.

David.
Re: Reseting 3325A

 

make shure that all the screws holding the pcb's are tighten, most of the grounds are closed thru the screws and the chasis.
Re: Wanted: 8505A Network Analyzer Manuals...

 

Hi Mike,

I have a paper set now. It is the other guy that needs
a set.

-Chuck

Dr M J DiGirolamo wrote:

Hi Chuck,
I have a set on microfish. Do you have a reader?
73,
Mike, W4XN
Reseting 3325A

 

Dear list members,

I own a 3325A, a nice function generator, however it has an
intermittent fault, it resets sometimes, usually it does that during
warmup, but once in a while it also resets after a few hours. I have
this generator for several years and tried to fix the problem. I first
checked the PSU, replaced all caps, resoldered all power transistors
of the PSU, replaced all caps on the CPU/logic board, replaced the DIP
switch on the CPU board, replaced the 3 flex strips with new solid
flexcable.

I have run out of ideas, but suspect that the cause is the nano
processor ??, any ideas would be welcome,

Thanks,

Fred, PE1FBO
Re: Wanted: 8505A Network Analyzer Manuals...

 

Hi Chuck,

I have a set on microfish. Do you have a reader?

73,

Mike, W4XN
-----------------

Hi,

I am trying to locate a set of manuals for my 8505A network analyzer
system.

I need:

HP8505A Opt 5,7 (3 volume set)
HP8501A
HP8503A Opt 1

I have found some or all from the various manual merchants,
but the prices are outrageous! $500 bucks seems to me to
be a bit excessive.

Does anybody have a set I could buy, borrow, or rent?

Thanks!

Chuck Harris
Re: Wanted: 8505A Network Analyzer Manuals...

 

Hi Glenn,

Yes I did! I paid something over $350USD for a set of 8505A originals.
They come in three, 3 inch, 3-ring binders, and about 50% of the
pages are fold out schematics. Each binder is packed beyond full
to overflowing with pages.... there are probably over 1200 pages
(double sided) in all.

The best bet is to do a google, and buy one of the reprinted sets
for around $200. It will cost you that much at Kinko's to make a copy.

-Chuck Harris

glenn_briceno wrote:

Hi Chuck,
I just picked up an 8505A myself. Did you ever get a copy of the manuals for your analyzer? I'm looking for a set myself.
-Glenn
Re: Wanted: 8505A Network Analyzer Manuals...

glenn_briceno
 

Hi Chuck,

I just picked up an 8505A myself. Did you ever get a copy of the
manuals for your analyzer? I'm looking for a set myself.

-Glenn

--- In hp_agilent_equipment@..., "chuck_585a"
<cfharris@...> wrote:


Hi,

I am trying to locate a set of manuals for my 8505A network analyzer
system.

I need:

HP8505A Opt 5,7 (3 volume set)
HP8501A
HP8503A Opt 1

I have found some or all from the various manual merchants,
but the prices are outrageous! $500 bucks seems to me to
be a bit excessive.

Does anybody have a set I could buy, borrow, or rent?

Thanks!

Chuck Harris
Re: HP SMPS MANUAL

 

Hi Anand,
If you go to the Agilent website ( ) and do a
Search on "8924", you will see a download for the "8924C/E Assembly
Level Repair Manual". On the left-hand side of Page 471, of this
manual, I believe there is a cable pin-out of the 0950-2952 power
supply, including expected voltages. It's not the schematic, but
perhaps it's better than troubleshooting the power supply blindly.
Regards,
Matt

--- In hp_agilent_equipment@..., "ANAND KP"
<anandkp63@...> wrote:


Hi

I am on the lookout for HP 0950-2952 Power supply Schematics.


thanks in advance


Anand
[Fwd: Re: Measuring frequency on a 50W transmitter]

didier_juges
 

--- In hp_agilent_equipment@..., Geoff Blake <geoff@...>
wrote:

On Fri, 15 Dec 2006, Didier Juges wrote:

I put the T in series with the output of the transmitter (between
the Tx
and the antenna or the load (better)) and the standalone BNC goes
to the
counter through another BNC cable. If you want to, you can simply
cut a
BNC cable somewhere in the middle and put the resistor in series with
the center conductor. Adjust the resistor value to provide the right
attenuation, i.e. to get 5 mW into the counter, which should be safe,
from a 50W Tx, you need 40dB of attenuation, which is a ratio of
100 in
voltage. If the counter has 50 ohm input, you put a 5k resistor in
series and you are done.

I use the same setup to inject a low level signal from a signal
generator into the RF input of a receiver for instance.

Good luck es 73,

Didier KO4BB
Didier, this is fine providing that 1) the 5K resistor is at the
T-piece end, and 2) from the non T-piece end of the 5K resistor,
you put a ~50 ohm resistor from the resistor/centre conductor to
the screen. This to give some sort of match to the cable,
otherwise, at some frequency it will be a 1/4 wave and can cause
strange effects. Using normal 6ft(ish) test leads, that is around
10 metres!

Of course 3/4 or 5/4 wave etc. will ahve similar effects.

Been there, done that.

Geoff
--
This is correct, but as long as the cable is matched at least at one
end, that will be fine. His counter only goes to 50MHz, so Gene would
not have problems if he were using MY test leads, which tend to be a
lot shorter than 6 feet :-)

My test cable has about 4" of cable between the T piece and the
resistor, that's good through VHF at least.

Now, the counter that Gene is using I believe does not have a 50 ohm
input, so he would need a 50 ohm pass-thru termination at the counter
end, or a 50 ohm resistor on the counter side of the 5k resistor.

Alternately, he can build a full 40 dB PI attenuator like the one
described in my MFJ-264 modification (2.7 k and 56 ohm resistors), and
match the cable at the other end, then cable length does not matter as
much.



Didier KO4BB
Re: [Fwd: Re: Measuring frequency on a 50W transmitter]

Geoff Blake
 

On Fri, 15 Dec 2006, Didier Juges wrote:

I put the T in series with the output of the transmitter (between the Tx
and the antenna or the load (better)) and the standalone BNC goes to the
counter through another BNC cable. If you want to, you can simply cut a
BNC cable somewhere in the middle and put the resistor in series with
the center conductor. Adjust the resistor value to provide the right
attenuation, i.e. to get 5 mW into the counter, which should be safe,
from a 50W Tx, you need 40dB of attenuation, which is a ratio of 100 in
voltage. If the counter has 50 ohm input, you put a 5k resistor in
series and you are done.

I use the same setup to inject a low level signal from a signal
generator into the RF input of a receiver for instance.

Good luck es 73,

Didier KO4BB
Didier, this is fine providing that 1) the 5K resistor is at the
T-piece end, and 2) from the non T-piece end of the 5K resistor,
you put a ~50 ohm resistor from the resistor/centre conductor to
the screen. This to give some sort of match to the cable,
otherwise, at some frequency it will be a 1/4 wave and can cause
strange effects. Using normal 6ft(ish) test leads, that is around
10 metres!

Of course 3/4 or 5/4 wave etc. will ahve similar effects.

Been there, done that.

Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff (at) palaemon (dot) co (dot) uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms

Please avoid sending me Word or PowerPoint attachments.
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[Fwd: Re: Measuring frequency on a 50W transmitter]

Didier Juges
 

W???QFC wrote:

Happy Holidays to all list members!

Again, I must call for help from this great group.
I want to use my 5302A to measure the frequency of a high power transmitter (50 watts +), so how would this be done?
Would I construct some sort of 'RF pick-up loop and if so, how would I do it?
As always, I really appreciate the help.

73,

Gene, W???QFC (OK on QRZ)
Spring Hill, Florida 34606
WEB SITE:


Gene,

Check

It uses a common T BNC connector adapter, a short piece of coax cable with a BNC plug, a resistor and a BNC socket.

I put the T in series with the output of the transmitter (between the Tx and the antenna or the load (better)) and the standalone BNC goes to the counter through another BNC cable. If you want to, you can simply cut a BNC cable somewhere in the middle and put the resistor in series with the center conductor. Adjust the resistor value to provide the right attenuation, i.e. to get 5 mW into the counter, which should be safe, from a 50W Tx, you need 40dB of attenuation, which is a ratio of 100 in voltage. If the counter has 50 ohm input, you put a 5k resistor in series and you are done.

I use the same setup to inject a low level signal from a signal generator into the RF input of a receiver for instance.

Good luck es 73,

Didier KO4BB
HP SMPS MANUAL

ANAND KP
 

Hi

I am on the lookout for HP 0950-2952 Power supply Schematics.


thanks in advance


Anand
Re: 141T rear panel terminating plug wanted.

Don Collie
 

Thanks for the tip, Bernie!.................................Don.

----- Original Message -----
From: "VE3FWF" <ve3fwf@...>
To: <hp_agilent_equipment@...>
Sent: Friday, December 15, 2006 4:00 PM
Subject: Re: [hp_agilent_equipment] 141T rear panel terminating plug wanted.


Check out

This guy is excellent.

Bernie


----- Original Message -----
From: "Don Collie" <donmer@...>
To: <hp_agilent_equipment@...>
Sent: Thursday, December 14, 2006 9:06 PM
Subject: [hp_agilent_equipment] 141T rear panel terminating plug wanted.


Looking for one rear panel termination[s] plug, as used
on the 141T mainframe.
Thanking you,....................................Don Collie jnr.



Yahoo! Groups Links




Yahoo! Groups Links





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No virus found in this incoming message.
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Re: 141T rear panel terminating plug wanted.

VE3FWF
 

Check out

This guy is excellent.

Bernie

----- Original Message -----
From: "Don Collie" <donmer@...>
To: <hp_agilent_equipment@...>
Sent: Thursday, December 14, 2006 9:06 PM
Subject: [hp_agilent_equipment] 141T rear panel terminating plug wanted.


Looking for one rear panel termination[s] plug, as used
on the 141T mainframe.
Thanking you,....................................Don Collie jnr.
Yahoo! Groups Links
141T rear panel terminating plug wanted.

Don Collie
 

Looking for one rear panel termination[s] plug, as used
on the 141T mainframe.
Thanking you,....................................Don Collie jnr.
Re: Measuring frequency on a 50W transmitter

John Miles
 


A great safety measure is to us a fused device on the counter input, to
protect it from excessive power. You could make one with a small
1/8 amp fuse, a
small box and RF connectors. Many commercial ones are also around.
The counter's input stage, whose geometry has about 1/1000 the size and
thermal mass of the fuse, will do a great job protecting the fuse. :) A
pair of back-to-back Schottky diodes, perhaps the kind rated for use in
switching supplies, might help if placed after the fuse.

An inline attenuator for the power/frequency range in question is really the
right way to go. Don't guess when it comes to protecting your test gear's
input stage. That's where we get all those auctions that say, "Removed from
a working environment! Powers up!!!11!"

-- john, KE5FX
Re: Measuring frequency on a 50W transmitter

[email protected]
 

Most VHF/UHF frequency counters use a terminated 50 ohm input, usually rated
at about 500 mW, and in this case, the fuse will provide protection, if you
do something that you shouldn't have done. If the input is a high impedance,
the fuse probably won't help, until the input melts.

Stuart K6YAZ
Measuring frequency on a 50W transmitter

[email protected]
 

Gene, there are several way to get it done. You could transmit into an
antenna and put a second antenna on the counter, or you could get a 30 dB or
higher power attenuator and place it between the transmitter and the counter. I
have a 1 kW 40 dB attenuator that I use on my test bench, but these don't come
cheap!

A directional coupler would also attenuate the power into the counter, while
the transmitter power is going to a load. A sampling loop could also be
used, but it's hard to know how much power is getting into the counter input. A
loop can be made by getting a piece of coax that matches the counter input
connector, and making an insulated 1 inch loop on the other end, between the
center conductor and the braid.


A great safety measure is to us a fused device on the counter input, to
protect it from excessive power. You could make one with a small 1/8 amp fuse, a
small box and RF connectors. Many commercial ones are also around.



Stuart K6YAZ
145881 - 145900 of 151260