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
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[Fwd: Re: Measuring frequency on a 50W transmitter]
--- 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
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Re: [Fwd: Re: Measuring frequency on a 50W transmitter]
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. See <> ------------------------------------------------------------------------------ This E-mail and any attachment(s) are strictly confidential and is intended solely for the addressee(s). If you are not the intended recipient please notify <postmaster(at)palaemon.co.uk> and the sender by return and permanently delete the message. You may not disclose, forward or copy this E-mail or any of its attachments to any third party without the prior consent of the sender. ------------------------------------------------------------------------------
|
[Fwd: Re: Measuring frequency on a 50W transmitter]
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
|
Re: 141T rear panel terminating plug wanted.
Thanks for the tip, Bernie!.................................Don.
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Show quoted text
----- 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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Version: 7.5.432 / Virus Database: 268.15.19/587 - Release Date: 12/14/2006 7:28 PM
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Re: 141T rear panel terminating plug wanted.
Check out
This guy is excellent.
Bernie
toggle quoted message
Show quoted text
----- 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.
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
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
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Re: Measuring frequency on a 50W transmitter
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
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:
|
Looking for HP 8505A spare parts. Anyone???
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
|
Re: HP8170a Information needed
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
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Show quoted text
On Dec 11, 2006, at 12:50 PM, tloleksy wrote:
I recently purchased the HP 8170a on Ebay by mistake. I was looking
for a generator that I could program to generate a particular signal.
My goal is to find the resident frequencies in a circuit I'm building.
On a limited budget, I've been able to make modifications to other
equipment to obtain what I was after. I've spent hour looking for
information on the HP 8170a without success. Before spending a great
deal of time or expense on service diagrams, does anyone know if what
I'm attempting to achieve with the 8170a is possible. Any information
on the 8170a would be grateful appreciated.
Thanks T.O. tloleksy@...
|
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
|
Re: HP PCB's in England - free to a good home
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
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Show quoted text
----- Original Message -----
From: Robert Atkinson
To: hp_agilent_equipment@...
Sent: Tuesday, December 12, 2006 8:57 AM
Subject: [hp_agilent_equipment] HP PCB's in England - free to a good home
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
Robert G8RPI
|
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
|
Re: HP PCB's in England - free to a good home
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
---------------------------------
Cheap Talk? Check out Yahoo! Messenger's low PC-to-Phone call rates.
|
HP PCB's in England - free to a good home
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
Robert G8RPI
|
Paul Bicknell