Re: Distribution divider/amplifier for 10MHz GPSDO
I use GRASS VALLEY GROUP VIDEO DISTRIBUTION AMP. There are a variety of plugins available for these units. I use 8500-8501 with excellent results. I find most test equipment will massage it's input REF so something not symmetrical will suffice. Watch ebay, they come up cheap. The home TV distribution amps are what I shovel out of the barn on a daily basis. There is one fully loaded for $30. with the 8501 cards, eBay item number:182839360311 exactly what I use.
Dennis
--------------------------------------------
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On Mon, 10/23/17, Gedas w8bya@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
Subject: Re: [hp_agilent_equipment] Distribution divider/amplifier for 10MHz GPSDO
To: hp_agilent_equipment@...
Date: Monday, October 23, 2017, 2:07 PM
Be careful with the amplifier you
pick up. Early
on I had the same idea and bought a cheap Asian unit
and found
out that it only had enough BW for a 6-7 MHz B/W
video signal.
Another thing to consider is if your output source
is analog or
digital. My GPS based unit provides a nice sine wave
so it's
requirements are a lot less strict than if a square
wave signal
was being used.
Gedas, W8BYA
Gallery at
Light travels faster than sound....
This is why some people appear bright until you hear them
speak.
On 10/23/2017
12:50 PM, Dave Casey
polara413@...
[hp_agilent_equipment] wrote:
?
I have heard that a popular solution is
to use
inexpensive video distribution amplifiers
after changing
the terminations from 75 to 50 ohms. This is
what I was
planning to do as well.
Dave Casey
On Mon,
Oct 23, 2017 at 11:43 AM,
'Paul Bicknell' paul@...
[hp_agilent_equipment] <hp_agilent_equipment@...>
wrote:
?
Hi
Regarding
ddistribution
divider/amplifier for 10
MHz in the
past I have talked to
others on this
subject and the
consensus was
that the
frequency response of the
amplifier must be grater
than 10 times
?that of the reference
frequency to
prevent distortion and lag
we ended up using
transistors that where
good for
450 MHz for a 10 MHz
reference
?
regards Paul
B
From:
hp_agilent_equipment@
yahoogroups.com
[mailto:hp_agilent_equipment@
yahoogroups.com]
Sent:
23 October 2017 13:39
To:
hp_agilent_equipment@
yahoogroups.com
Subject:
[hp_agilent_equipment]
Distribution
divider/amplifier for
10MHz
GPSDO
?
?
Hello
group. I`m intending
to
distribute, via 50
Ohm coax,
frequency reference
signals to my test
equipment in
my test bay [no
relation to
eBay, except that
most of the
equipment came from
there]. I`ll be
using RG58/U
coax, and 50 ohm
terminations, with
the highest
reasonable signal
level
reticulated. Given
that
the name of the game
seems to be
to avoid any severe
reduction in
SNR of the
10MHz signal comming
out of the
GPSDO, by the logic
dividers,
and impedance
lowering buffer
amplifiers, what
considerations
should be made
regarding the
choice of logic
families, and
transistors to be
used? The
frequencies required
by the test
equipment vary from
500kHz to 10MHz, and
amplitudes
from 100mV P-P
sinewave, to 5V peak
squarewave.
How good must the
PSU be to stop
the rot
getting worse, and
is 1/f noise
in the active
devices important?
Your thoughts
will be
appreciated.
P.S.:
How
accurate is the
Trimble
Thunderbolt for this
application?.................. ............................
Thankyou,............Don
Collie.
No virus found in
this message.
Checked by AVG - www.avg.com
Version: 2016.0.8013 /
Virus Database:
4782/15063 - Release Date:
10/23/17
|
You guys are awesome!!! I will carefully read the ADC's datasheet to see if there is any viable substitute for it. My repair stories so far is always in RF and pure analog path. This is certainly a challenge for me given that the part is not readily available. I'll see if I can negotiate a good price with the seller that worth the trouble.
What is the fair price you would offer for a non-defective 8340 if you guys don't mind...
Thanks again! Calvin
On Monday, October 23, 2017, 4:52:01 AM PDT, lexternegron@... [hp_agilent_equipment] wrote:
?
Hello Tobias,
Oops. (facepalms) and I was looking at your post too! (facepalms harder). Confused your post with Tam Hanna. XD That'll do as a replacement. As for the ADC, I concur about availability. I'll have to check later on. The data book posted should be useful in knowing electrical characteristics. As for physical ones, you may have to get creative while looking for a size flexible replacement. Maybe on some of the electrical characteristics as well.
-Lex
|
Re: Distribution divider/amplifier for 10MHz GPSDO
Be careful with the amplifier you pick up. Early
on I had the same idea and bought a cheap Asian unit and found
out that it only had enough BW for a 6-7 MHz B/W video signal.
Another thing to consider is if your output source is analog or
digital. My GPS based unit provides a nice sine wave so it's
requirements are a lot less strict than if a square wave signal
was being used.
Gedas, W8BYA
Gallery at
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 10/23/2017 12:50 PM, Dave Casey
polara413@... [hp_agilent_equipment] wrote:
toggle quoted message
Show quoted text
?
I have heard that a popular solution is to use
inexpensive video distribution amplifiers after changing
the terminations from 75 to 50 ohms. This is what I was
planning to do as well.
Dave Casey
|
Re: 1853-0063 transistor needed
Thanks for everyone that responded. ?I’ve located one from a member of this group.
|
Re: Distribution divider/amplifier for 10MHz GPSDO
If this is for routine use to have all the gear synchronized and show?consistent frequencies, then you don't need anything fancy. Pick the reference output from one of the instruments, that seems the best, or use an external OCXO box. If you need very precise and stable references, then use a GPSDO or such, depending on the need. A video distribution amp should suffice - I wouldn't even worry about the 75 versus 50 ohm issue, unless the reference cables?need to go a considerable distance. ? I'd recommend 74HC logic for any squaring-up and dividing requirements. It's probably the easiest to implement with, of all the families. ? If you need it to be really really good, for high stability, precision frequency/phase measurements and comparisons, then visit the time-nuts group to see what they're about. In that world, everything matters in striving for perfection. Be prepared to suffer from time/frequency precision envy, but be happy if your application is more mundane, and you don't have to worry about so much. ? Ed
|
Re: Distribution divider/amplifier for 10MHz GPSDO
I'm using a 75Ω video distribution amp, works just fine. $10 for 6 inputs, 30 outputs in? 2 inputs - 10 out config. I've daisy chained the inputs using the second port on the first one to feed amp #2, repeat to feed amp #3.
Works very well.
?
I have heard that a popular solution is to use inexpensive video distribution amplifiers after changing the terminations from 75 to 50 ohms. This is what I was planning to do as well.
Dave Casey
|
Re: Distribution divider/amplifier for 10MHz GPSDO
I have heard that a popular solution is to use inexpensive video distribution amplifiers after changing the terminations from 75 to 50 ohms. This is what I was planning to do as well.
Dave Casey
?
Hi
Regarding ddistribution
divider/amplifier for 10 MHz in the past I have talked to others on this
subject and the
consensus was that the frequency response of the
amplifier must be grater than 10 times ?that of the reference frequency to
prevent distortion and lag
we ended up using transistors that where good for
450 MHz for a 10 MHz reference
?
?
?
Hello
group. I`m intending to distribute, via 50 Ohm coax, frequency reference
signals to my test equipment in my test bay [no relation to eBay, except that
most of the equipment came from there]. I`ll be using RG58/U coax, and 50 ohm
terminations, with the highest reasonable signal level reticulated. Given that
the name of the game seems to be to avoid any severe reduction in SNR of the
10MHz signal comming out of the GPSDO, by the logic dividers, and impedance
lowering buffer amplifiers, what considerations should be made regarding the
choice of logic families, and transistors to be used? The frequencies required
by the test equipment vary from 500kHz to 10MHz, and amplitudes from 100mV P-P
sinewave, to 5V peak squarewave. How good must the PSU be to stop the rot
getting worse, and is 1/f noise in the active devices important? Your thoughts
will be appreciated.
P.S.: How
accurate is the Trimble Thunderbolt for this
application?..............................................Thankyou,............Don
Collie.
No virus found in this message.
Checked by AVG -
Version: 2016.0.8013 / Virus Database: 4782/15063 - Release Date: 10/23/17
|
Re: Distribution divider/amplifier for 10MHz GPSDO
Hi, Plan "B" might be to use an HP 5087A, I found two locally Surplus for $50 each, had most of the cards needed to distribute 10Mhz at the proper levels, low noise.? I use them with Trimble thunderbolts and Jackson Labs Fury, great. Ebay has 5087A for more $$, but most ebay vendors don't know what cards are in them, the option labels don't mean much after these have been through many owners. Patience and questions are sometimes rewarded there. 73 Frank KJ4OLL
|
Re: OT Omni Spectra Semi-Rigid Tools
Sounds like something that would go well in the files section as well as on the ko4bb site.
?
On Mon, 23 Oct 2017, djn@... [hp_agilent_equipment] wrote:
> Jim:
>
> I came across a 1990 M/A-Com catalog that has quite a bit of tooling in
> it. I tracks what you found as well.
>
>
> I'm putting together a spread sheet of all the kits and numbers....Can
> send along to whoever wants....
Please count me in on that :)
---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
|
Re: Distribution divider/amplifier for 10MHz GPSDO
Hi
Regarding ddistribution
divider/amplifier for 10 MHz in the past I have talked to others on this
subject and the
consensus was that the frequency response of the
amplifier must be grater than 10 times ?that of the reference frequency to
prevent distortion and lag
we ended up using transistors that where good for
450 MHz for a 10 MHz reference
?
regards Paul B
From:
hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]
Sent: 23 October 2017 13:39
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment]
Distribution divider/amplifier for 10MHz GPSDO
?
?
Hello
group. I`m intending to distribute, via 50 Ohm coax, frequency reference
signals to my test equipment in my test bay [no relation to eBay, except that
most of the equipment came from there]. I`ll be using RG58/U coax, and 50 ohm
terminations, with the highest reasonable signal level reticulated. Given that
the name of the game seems to be to avoid any severe reduction in SNR of the
10MHz signal comming out of the GPSDO, by the logic dividers, and impedance
lowering buffer amplifiers, what considerations should be made regarding the
choice of logic families, and transistors to be used? The frequencies required
by the test equipment vary from 500kHz to 10MHz, and amplitudes from 100mV P-P
sinewave, to 5V peak squarewave. How good must the PSU be to stop the rot
getting worse, and is 1/f noise in the active devices important? Your thoughts
will be appreciated.
P.S.: How
accurate is the Trimble Thunderbolt for this
application?..............................................Thankyou,............Don
Collie.
No virus found in this message.
Checked by AVG -
Version: 2016.0.8013 / Virus Database: 4782/15063 - Release Date: 10/23/17
|
Re: HP3585A Serial Numbers
|
Re: 8566B PL1 Unlock, PL2 Unlock and Ref Unlock
This goes to show the importance of not relying on DC measurements alone - always check supplies with a scope if something is suspicious. Meter measurements alone won't show ripple and other flakiness - they just average out whatever waveform is there. ? Ed
|
Re: OT Omni Spectra Semi-Rigid Tools
On Mon, 23 Oct 2017, djn@... [hp_agilent_equipment] wrote: Jim:
I came across a 1990 M/A-Com catalog that has quite a bit of tooling in
it. I tracks what you found as well.
I'm putting together a spread sheet of all the kits and numbers....Can
send along to whoever wants.... Please count me in on that :) --- * * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * *
|
Re: HP3585A Serial Numbers
Gedas,
Do you still have the HP catalogs and the last year that the HP3585A was made.?
Sam
|
HP3585A Pull-out guides/operation
Looking for the HP3585A Pull-out guides/operation, that is?on the bottom of the analyzer.
Sam
|
Re: OT Omni Spectra Semi-Rigid Tools
Dan,
I’d appreciate a copy. Once I’m back from a trip I’ll take what I have and bits that have been given me over the weekend and, with your permission, your information, and package it up to go on the KO4BB manual repository online.?
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On Oct 23, 2017, at 2:21 AM, djn@... [hp_agilent_equipment] < hp_agilent_equipment@...> wrote:
?
Jim:
I came across a 1990 M/A-Com catalog that has quite a bit of tooling in it. I tracks what you found as well.?
I'm putting together a spread sheet of all the kits and numbers....Can send along to whoever wants....
Dan in Chandler, AZ
Thanks so much for looking around on this!
|
Distribution divider/amplifier for 10MHz GPSDO
Hello group. I`m intending to distribute, via 50 Ohm coax, frequency reference signals to my test equipment in my test bay [no relation to eBay, except that most of the equipment came from there]. I`ll be using RG58/U coax, and 50 ohm terminations, with the highest reasonable signal level reticulated. Given that the name of the game seems to be to avoid any severe reduction in SNR of the 10MHz signal comming out of the GPSDO, by the logic dividers, and impedance lowering buffer amplifiers, what considerations should be made regarding the choice of logic families, and transistors to be used? The frequencies required by the test equipment vary from 500kHz to 10MHz, and amplitudes from 100mV P-P sinewave, to 5V peak squarewave. How good must the PSU be to stop the rot getting worse, and is 1/f noise in the active devices important? Your thoughts will be appreciated. P.S.: How accurate is the Trimble Thunderbolt for this application?..............................................Thankyou,............Don Collie.
|
Hello Tobias,
Oops. (facepalms) and I was looking at your post too! (facepalms harder). Confused your post with Tam Hanna. XD That'll do as a replacement. As for the ADC, I concur about availability. I'll have to check later on. The data book posted should be useful in knowing electrical characteristics. As for physical ones, you may have to get creative while looking for a size flexible replacement. Maybe on some of the electrical characteristics as well.
-Lex
|
Hi Bob,
?
AFAIK the recurring problem with these little printers is the flexi ribbon cable ages and breaks meaning printing has rows of
dots missing.
?
Don’t recall problems with the interfaces (GPIB/Serial/Parallel).
?
It is repairable but needs some skill to avoid damaging the flexi completely – typically the brake is always on the bend at the head…
What do others think?
?
?
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: 20 October 2017 23:16
Subject: [hp_agilent_equipment] 2225a gpib inkjet
?
?
So I’ve been asked to help dig out a house of a deceased electronic, test equipment and ham radio hoarder.
One of the things it turned up while going through the many many boxes was 3 HP2225 inkjet printers with Gpib interfaces.
I see the ink cartridges are still available. Has anyone tried to breathe life back into one after sitting on a shelf for a few years (decades perhaps)?
Thanks,
Bob
And yes, the place is a thing of dreams/nightmares. Floor to ceiling, basement, first, second floor, isles just wide enough to walk in. We’re doing an on-site sale next weekend in Albany, N.Y. Send me a message offline and I’ll share the details.
A few pictures here:
And that’s just the stuff that wasn’t in boxes.
|
Lex,
the MP7533 is the easiest. Didn't you see my previous message?
It is the same as MX7533 by Maxim, still available :-)
Tobias
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-------- Original message --------
From: "lexternegron@... [hp_agilent_equipment]"
Date: 10/23/17 12:52 (GMT+01:00)
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 8340A Fault - ADC
?
From googling, hp crosref (link??), and bitsavers. Might have to Ctrl + F part of the name like I did for "DC856"
since pdf file have a hard time reading.
Signetics Corp. NE5018F - page 550
Datel Systems Inc. or Datel-Intersil ADC856C - page 145
Micro Power Systems (owned by the Exar Corporation) MP7533MP - page ???
??? need to find this. I thought the Datel one with the custom HP number would be hard.
and one more, the MUX
Precision Monolithic Inc. - page 764
These are a fountain of knowledge. Now only specs but app notes and introductions as to why to use them in design. Enjoy.
-Lex
|
bownes
Paul Bicknell
Cubdriver
Sergey Kubushyn