?

Rich:

I just checked out The Demi Distribution amp you recommended to use on my ?Leo Bodnar GPS Disciplined Oscillator as it outputs only two software adjustable channels from 450 Hz to 800 MHz – I will be using one 10MHZ output to precision time multiple sync inputs - and this D.A. Looked ideal.

Unfortunately the vendor is sold out and is quoting ?seven week ?unavailability.

This looks like an excellent product from the specs and I have marked my calendar.

Thank you for the heads up.

Lee

???

Hi Calvin

unfortunately, I've got no 8340 to offer. However, I have a large collection of old and obsolete ICs.

If you tell me what you need, I can have a look.

The 7533 is available from Maxim, the other parts I don't know whether I can find one.

I can have a look tomorrow :-)

However, I would first try some more debugging to see whether the fault is somewhere else, and not in the ADCs.

Tobias

-------- Original message --------

From: "Calvin Guan guancalvin@... [hp_agilent_equipment]"

Date: 10/23/17 21:09 (GMT+01:00)

To: hp_agilent_equipment@...

Subject: Re: [hp_agilent_equipment] Re: 8340A Fault - ADC

???

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

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



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


------------------------------------
Posted by: Dennis Czelusniak <czelusniakd@...>
------------------------------------


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

Yahoo Groups Links

?

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 -
Version: 2016.0.8013 / Virus Database: 4782/15063 - Release Date: 10/23/17