Re: 3586A encoder question
Don,
thanks for the advice. I could do this in the next days. I will post the results.
Antonio I8IOV
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--- In hp_agilent_equipment@..., Don Bitters Jr <donbitters@...> wrote:
The 3586, 8568, 8566, 8340 series units All used the RPG encoders with a lamp HP 2140-0016 (653 lamp ??). These RPG's were round flattened cylinders. if the lamps were old/darkened by age/misaligned you could get " works in one direction but not the other". The solution is to remove the RPG, pop the end cover-2 opposite tabs, use needle nose to pull the bulb from the side, check bulb for clarity, resistance-90 ohms, reinsert/replace with base of bulb flush with case of RPG, AND parallel to the optical grating inside - parallel to the PC brd. The detector diodes need to be illuminated equally.
Don B.
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Re: HP 11660A Shunt for HP 8556A
Steve,
A shunt means something in parallel. Shunt resistors are most commonly used in meter circuits. The shunt (or, low ohm resistor) is in parallel with the meter. There is no voltage divider.
If you need a 50 ohm termination, just use a 50 ohm resistor. What DO you need, anyway?
-br4
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Re: DIY: Repair of HP Step Attenuators
Thanks a lot of this.
I just managed to get a 8568B that attenuator has some problems with the 20dB step.
These instructions encourage me to open the attenuator and clean the pads with isopropyl alcohol. Now it works fine.
I didn't made a testped for it i just cold moved carefully the solenoids and checked with dg8saq vnwa the attenuator pads. I'm not sure is the solenoid stuck or is it actually a contact failure.
The instructions how to disaasemble the attenuator was very accurate and easy to follow.
BR, Jarmo
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Both the 260-A Q-Meter and the 250-A RX Meter were made under the HP brand. Development continued for a while in NJ. A 250-B was made.
The 260-A was replaced by the 4342A.
RX meters vanished and were replaced by VNA's
One not mentioned was the higher frequency Q-Meter, the 190-A. I have
a 190B, which is different andappears to be almost production. With
it came some design notes on a redesign replacing the tubes with transistors. Sadly no names on any of the notes.
There are a couple useful sites for the 260-A
(manuals)
k5bcq talks about making his own work coils, for a long time 103A's were pretty much non existent. But over the past 3 to 4 years they have been showing up. The ones above 5 MHz are still pretty rare.
And if your patient the 518A standards can be had.
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--- In hp_agilent_equipment@..., "Richard Knoppow" <dickburk@...> wrote:
----- Original Message -----
From: "Dave Daniel" <kc0wjn@...>
To: <hp_agilent_equipment@...>
Sent: Friday, December 21, 2012 4:47 PM
Subject: Re: [hp_agilent_equipment] HP Oldies.
Really? I thought I've seen Boonton instruments younger
than that. Did
HP keep the Boonton name for a while after the
acquisition?
Dave
Boonton radio started in 1934 as Radio Frequency
Laboratories and reformed as Boonton Radio Corporation a
short time later. Its first product was the Q-Meter. -hp-
kept the Boonton name for a couple of years anyway. I don't
know if any Q-Meters or RX-Meters were made with the -hp-
trade mark on them but the name is on the label on the back.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@...
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frequency counter Systron Donner 6054b help repair
Hello looking for someone who has the frequency counter Systron Donner 6054b? (I own the service manual) be able to compare the measures to repair my thanks for the help
Roberto
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I am looking for a BNC Fuse Holder. Anyone have one they
will part with ?
Thanks, Dick, W1KSZ
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rotary encoders for instruments (54542)
Hi,
The key panel data entry encoder on my HP54542C scope has worn out. Anyone know of a source for replacements?
Numbers on the encoder are: 9436, and 1-2-36.
The part is listed as replaceable by entire board assembly with part number 54542-66506, though it's pretty easy to just change the encoder.
I tried to repair it but the plating on the encoder PCB is about done for. It works again but who knows for how long.
Thanks.
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Hi Folks,
I've been installing option 011 (HPIB) on my HP5328a counter wich has a bleu wire for arming wich goes to a pin behind the operating panel. In my counter that is also the pin where Channel C gets its arming with a blue wire as well. What to do just parallel them?
Bas.
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Re: HP 8556A plugin required for an HP141T
Hi MK whereaboutsare you in the UK? I will have to check but I may have a spare frame, though Iam not sure what state its in.
Alan
G3NYK
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----- Original Message ----- From: "m1k3k1" <m1k3k1@...> To: <hp_agilent_equipment@...> Sent: Wednesday, December 26, 2012 8:45 PM Subject: [hp_agilent_equipment] HP 8556A plugin required for an HP141T As title, I an in the UK, so would prefer to get one from the UK or europe as postage and vat would make it expensive otherwise
Aslo would like to get hold of a non-working HP141T chassis, dont mind if the tube is gone, but also best to source from UK as they are quite heavy. would want to use the dead one for spares to keep the other one going.
Regards,
M K
------------------------------------
Yahoo! Groups Links
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HP 8556A plugin required for an HP141T
As title, I an in the UK, so would prefer to get one from the UK or europe as postage and vat would make it expensive otherwise
Aslo would like to get hold of a non-working HP141T chassis, dont mind if the tube is gone, but also best to source from UK as they are quite heavy. would want to use the dead one for spares to keep the other one going.
Regards,
M K
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We moved from there when I was five years old. I never knew that there
was as many electronics companies in the area as you list.
Dave
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On 12/24/2012 4:16 PM, petepdx1955 wrote:
There were two companies with Boonton in their name
Boonton Electronics. Now a division of a British company boonton.com
if interested.
Their two biggest contributions were a C and L bridges that ran at 1
MHz, and a power meter head using diodes.
Boonton Radio Corporation or BRC. These are the guys HP bought. The
Q-Meter is prob the biggest contribution, but they did a few other
things very well one of which was generators that could FM better then
any one else at the time.
The area around Boonton was quite the concentration, all basically
springing from a company called Ferris Instruments. Ballentine was
another off shoot.
Another company not into instruments but in the same area was Aircraft
Radio Corp, or ARC.
--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>, Dave Daniel
<kc0wjn@...> wrote:
Wow. I didn't know HP bought Boonton. I always liked Boonton
instruments, probably because I was born in Boonton. When did HP buy
them?
Dave
On 12/21/2012 12:59 PM, Max Robinson wrote:
I am looking for a couple of HP oldies. The 260A Q meter and the
250A RX
meter. I can't find any on eBay. These two instruments were
carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
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Motorola MSPS7279 and MSPS7278 Transistors
I am looking for any data, substitute, or availability on these transistors. The 7279 is an NPN and the 7278 is a PNP silicon as best I can tell. They are both TO-220 type cases with an 'EBC' pin out.
The application uses 4 of these, with a 36.5 ohm resistor in series with the emitter, all in parallel, to make up a TO-66 type package transistor substitute for each of tne PNP and NPN application.
Thanks in advance.
Joe
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Service manuals for 526C (2 x) and 560A for free!
Hi,
I'd like to give away the above mentioned service manuals for free. I only ask for refund of the shipping costs from Germany (registered mail for about US$ 8.00 to the US via PayPal).
Best regards
pudu51
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Re: 608 output attenuator. and more
On 12/26/2012 12:53 AM, Patrick Wong wrote:
Hi Doug,
I'm not sure how the OP's test would distinguish between
1) a situation where the attenuator resistor(s) is/(are) open and he
is introducing a load of 50 ohms with the passthrough terminator, vs.
2) a situation where the attenuator resistor(s) is/(are) fine, and the
passthrough terminator is used.
In both 1) and 2), the voltage measurement will probably drop by ~50%
when the passthrough terminator is introduced.
I like your other post offering an alternate way to test without
access to an antenna bridge. That alternative assumes the existence of
another RF generator whose output is loaded by the 608 attenuator.
Patrick Wong AK6C
--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>, Doug <dmcgarrett@...>
wrote:
...If all you are doing is adding and removing a 50 ohm resistor
across the 608 output, and measuring the output with a scope, then
the test would seem to be kosher, IF you use a high-impedance 10:1
scope probe...
<;_ylc=X3oDMTJyZzkzdDl1BF9TAzk3MzU5NzE0BGdycElkAzEwOTI5MzMzBGdycHNwSWQDMTcwNTA4MzY2MwRtc2dJZAM0ODcyNQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzEzNTY1MDEyMTU-?act=reply&messageNum=48725>
The situation that Patrick envisions is somewhat unknown. I would guess that if the attenuator resistors were blown, then adding a 50 ohm load across the 608 output would probably cause the signal level to drop MORE than 50%, but it would depend on what's the actual impedance of the unterminated attenuator. So we may both be wrong! I suggested the measurement with another source of RF since the poster did not have an antenna analyzer, which of course, is another source of RF. (The antenna analyzer would have actually been my first attempt, because I do own one. But I also own another RF generator or two-- a Measurements Model 80 and two sweep generators that cover 10MHz.) doug, WA2SAY
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Re: 608 output attenuator. more
On 12/26/2012 12:01 AM, Max Robinson wrote:
I don't have any antenna or RF impedance bridge that I trust. So the
50 ohm
termination and "infinite" impedance test is all I have.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
Transistor site
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Woodworking site
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To subscribe to the fun with transistors group send an email to.
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----- Original Message -----
From: "Patrick Wong" <patwong3@... <mailto:patwong3%40cox.net>>
To: <hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>>
Sent: Tuesday, December 25, 2012 9:16 PM
Subject: [hp_agilent_equipment] Re: 608 output attenuator.
Hi Max,
I'm not sure how this proves the attenuator is OK. If you use an
oscilloscope with the option to select between a 50 ohm input and a 1M ohm
input, the 50 ohm input will typically result in vertical deflection ~50%
of the high impedance input.
The use of a 50 ohm passthrough adapter on a 1M ohm input, is a reasonable
equivalent of selecting a 50 ohm input on the scope's vertical channel, at
least until you reach a sufficiently high frequency so the passthrough
adapter starts to display a reactance component.
If you have access to an antenna analyzer like an MFJ259B or MFJ269, then
you can measure the VSWR of the 608 antenna output. I would say that is a
reasonable test if you do not wish to remove the attenuator to physically
inspect and measure the resistor(s).
Patrick Wong AK6C
--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, "Max Robinson" <max@...>
wrote:
...Today I checked it again the way I had calibrated it
with a short cable and a pass through 50 ohm termination at the scope
end.
I set the frequency to 10 MHz and the attenuator to 100 mV to be sure
there
would be no proximity effect between the pickup coil and the output
tuned
circuit. With the scope reading 100 mV within accuracy spects I then
removed the termination and measured 200 mV within accuracy spects.
From
this I conclude that my output attenuator has not been damaged by
someone
transmitting into it.
Perhaps I misunderstood the measurement, since this thread has been running for a while. If all you are doing is adding and removing a 50 ohm resistor across the 608 output, and measuring the output with a scope, then the test would seem to be kosher, IF you use a high-impedance 10:1 scope probe. (Otherwise the input capacitance of the scope will degrade the results.) --doug, WA2SAY
|
Re: 608 output attenuator.
On 12/26/2012 12:01 AM, Max Robinson wrote:
I don't have any antenna or RF impedance bridge that I trust. So the
50 ohm
termination and "infinite" impedance test is all I have.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
Transistor site
Vacuum tube site:
Woodworking site
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To subscribe to the fun with transistors group send an email to.
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----- Original Message -----
From: "Patrick Wong" <patwong3@... <mailto:patwong3%40cox.net>>
To: <hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>>
Sent: Tuesday, December 25, 2012 9:16 PM
Subject: [hp_agilent_equipment] Re: 608 output attenuator.
Hi Max,
I'm not sure how this proves the attenuator is OK. If you use an
oscilloscope with the option to select between a 50 ohm input and a 1M ohm
input, the 50 ohm input will typically result in vertical deflection ~50%
of the high impedance input.
The use of a 50 ohm passthrough adapter on a 1M ohm input, is a reasonable
equivalent of selecting a 50 ohm input on the scope's vertical channel, at
least until you reach a sufficiently high frequency so the passthrough
adapter starts to display a reactance component.
If you have access to an antenna analyzer like an MFJ259B or MFJ269, then
you can measure the VSWR of the 608 antenna output. I would say that is a
reasonable test if you do not wish to remove the attenuator to physically
inspect and measure the resistor(s).
Patrick Wong AK6C
--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, "Max Robinson" <max@...>
wrote:
...Today I checked it again the way I had calibrated it
with a short cable and a pass through 50 ohm termination at the scope
end.
I set the frequency to 10 MHz and the attenuator to 100 mV to be sure
there
would be no proximity effect between the pickup coil and the output
tuned
circuit. With the scope reading 100 mV within accuracy spects I then
removed the termination and measured 200 mV within accuracy spects.
From
this I conclude that my output attenuator has not been damaged by
someone
transmitting into it.
It would be better if nobody top-posts. That having been said; As you place and remove the 50 Ohm load, you are mismatching THE GENERATOR, such that the signal may vary by 2:1. If you want the test to make sense, you need to connect the generator output thru a fairly large series resistor--say 470 ohms--to the 608 input port. Connect your scope thru a 10:1 probe to that same input port. Now, with that connected, add a 51 ohm resistor in parallel with the 608 input. If the scope reading drops by about 50%, then the 608 has a 50 ohm impedance at the port. If it drops by quite a bit more than 50%, then the 608 has a higher impedance than 50 Ohms, and there would appear to be a problem with the attenuator circuit. BTW, if you don't have a scope, a high-impedance VTVM that will read at 10 MHz (it doesn't have to be accurate) will work similarly. Doug, WA2SAY
|
Re: 608 output attenuator.
I don't have any antenna or RF impedance bridge that I trust. So the 50 ohm termination and "infinite" impedance test is all I have.
Regards.
Max. K 4 O DS.
Email: max@...
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To subscribe to the fun with transistors group send an email to.
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----- Original Message ----- From: "Patrick Wong" <patwong3@...> To: <hp_agilent_equipment@...> Sent: Tuesday, December 25, 2012 9:16 PM Subject: [hp_agilent_equipment] Re: 608 output attenuator. Hi Max,
I'm not sure how this proves the attenuator is OK. If you use an oscilloscope with the option to select between a 50 ohm input and a 1M ohm input, the 50 ohm input will typically result in vertical deflection ~50% of the high impedance input.
The use of a 50 ohm passthrough adapter on a 1M ohm input, is a reasonable equivalent of selecting a 50 ohm input on the scope's vertical channel, at least until you reach a sufficiently high frequency so the passthrough adapter starts to display a reactance component.
If you have access to an antenna analyzer like an MFJ259B or MFJ269, then you can measure the VSWR of the 608 antenna output. I would say that is a reasonable test if you do not wish to remove the attenuator to physically inspect and measure the resistor(s).
Patrick Wong AK6C
--- In hp_agilent_equipment@..., "Max Robinson" <max@...> wrote:
...Today I checked it again the way I had calibrated it
with a short cable and a pass through 50 ohm termination at the scope end.
I set the frequency to 10 MHz and the attenuator to 100 mV to be sure there
would be no proximity effect between the pickup coil and the output tuned
circuit. With the scope reading 100 mV within accuracy spects I then
removed the termination and measured 200 mV within accuracy spects. From
this I conclude that my output attenuator has not been damaged by someone
transmitting into it.
------------------------------------
Yahoo! Groups Links
|
Re: 608 output attenuator.
Ah you were luckier than I. My Marconi TF1066/4 not only had a broken attenuator rack (from removing from cabinet without first turning it inward) but also a burned out 47 Ohm resistor at the probe.
It required complete removal of the probe assembly, including some gear work and springs and so on.
A lot of work but now the generator output is accurate and the attenuator works smoothly. The resistor is 1/4 Watt so it doesn't take much to burn it out. Maybe 5 Volts of rf for most of a minute. A 100 Watt transmitter delivers 71 Volts; that should do it in a second or less.
Bob
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--- On Tue, 12/25/12, Max Robinson <max@...> wrote: From: Max Robinson <max@...>
Subject: [hp_agilent_equipment] 608 output attenuator.
To: hp_agilent_equipment@...
Date: Tuesday, December 25, 2012, 10:52 AM
You may remember that I was concerned
about the integrity of the output
attenuator in my 608D.? Today I checked it again the
way I had calibrated it
with a short cable and a pass through 50 ohm termination at
the scope end.
I set the frequency to 10 MHz and the attenuator to 100 mV
to be sure there
would be no proximity effect between the pickup coil and the
output tuned
circuit.? With the scope reading 100 mV within accuracy
spects I then
removed the termination and measured 200 mV within accuracy
spects.? From
this I conclude that my output attenuator has not been
damaged by someone
transmitting into it.
Regards.
Max.? K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email
to.
funwithtransistors-subscribe@...
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to
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------------------------------------
Yahoo! Groups Links
? ? hp_agilent_equipment-fullfeatured@...
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Re: 3586A encoder question
The 3586, 8568, 8566, 8340 series units All used the RPG encoders with a lamp HP 2140-0016 (653 lamp ??). These RPG's were round flattened cylinders. if the lamps were old/darkened by age/misaligned you could get " works in one direction but not the other". The solution is to remove the RPG, pop the end cover-2 opposite tabs, use needle nose to pull the bulb from the side, check bulb for clarity, resistance-90 ohms, reinsert/replace with base of bulb flush with case of RPG, AND parallel to the optical grating inside - parallel to the PC brd. The detector diodes need to be illuminated equally.
Don B.
|
