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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

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

--- 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

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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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

Hi

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


thanks in advance


Anand

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

Check out

This guy is excellent.

Bernie

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

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

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

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

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:

Hi to all
I've a 8505A RF/IF Unit (lower part) that needs some repair. Basically
I'm looking for some spare parts only and not a unit to salvage for,
but if there is any available out there I will give it a try...
However, now I'm looking for a pot, for the vernier of stop frequency,
a rotary encoder for frequency adjuster, and some other spares inside
the unit that might be hard to find. These are 2 connectors of 2x25
pins for the pcb slots positions on motherboard. At least a source for
them or any related info...
Thanks in advance
Sotiris Pdmtr

I've got an 8170a and the Operating and Service Manual for it. It's
the typical HP O&S manual; about 2" thick and loaded with fold-out
pages. If there is something I can look up for you, I'd be happy to
do so, and, if anyone has figured out a good way to copy those fold-
out pages, I'd be happy to scan the thing in or loan the manual out
so somebody else can do the dirty work.

My 8170 is in very good shape. The battery was bad but didn't do any
damage to the board or surrounding components; it was in the "fuzzy"
stage, but hadn't leaked acid over anything. I need to rebuild the
keyboard, which is sticky, but otherwise it's quite nice.

Except, of course, that it's missing the output pods (15452a, 15453a,
15454a, 15455a, 15456a) - and so utterly worthless. I'm sure nobody
will be surprised, but I haven't been able to find them anywhere. Any
leads (no pun intended) would be appreciated.

-Mark

I am in Need of a Operation and Service Manual for HP 5306a
Multimeter,Counter.
Also Looking for the Proper Knob for the Sample Rate control,(Grey
Plastic) and the Negative Binding Post screw end, (Grey Plastic with
Black Tip).
Any Help would be Appreciated.

Rod.
VE5RMK

HI
I live in West Sussex and I am interested in the PCB's especially for 8620 Sweeper or 5345 A counter etc
Paul Tel 01903 787324

Adding to the recent oscillator thread: Maxim has introduced +/- 1minute/year
(+/- 3.5ppm) at 0-40C integrated TCXOs (DS3234, for example). IMHO, that's
pretty darn good for something that fits in a 20 pin wide so package.

Does anyone have experience with their phase noise? As far as I'm concerned,
those are mighty good specs for such a small, non-ovenized package??

Cheers, Kuba

On Tuesday 12 December 2006 03:57, Robert Atkinson wrote:

Hi,
I've recently lost some of my storage space and am looking for a home
for a small collection of PCB's from various items of HP test equipment.
They are mostly from earlier solid state equipment. Collection
preferred, I'm in Christchurch Dorset, or postage at cost.
Anyone interested please contact me off-list

I'm looking for 00204-66538, that's the power supply assembly for an HP 204C
sine oscillator. Even a bare board would be fine. Mine is damaged from
battery leak and I'm trying to avoid rebuilding it.

Cheers, Kuba

Greetings,

I have a few gold plated pcb's that I have stripped bare. How many boards do you need before you consider finding a gold salvage buyer?

Jerry


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