I recently got an 8970B & 346B from Pete. I'd like to add an 8971B to the system so I can cover the 2.4 & 5 GHz ISM bands.

There are some 8971Bs on ebay, but the the cheap ones are "untested, no returns". As I think all are aware the "untested" may or may not be true. This gets really questionable when the seller is xxxxx_test.

Does anyone have any advice to offer? Or better yet, one to sell.

Also, I have an 83631B. Can I use that as the LO instead of an 83630B? For the sake of repeatability I plan to run everything via GPIB and a program.

Thanks,
Reg

Thanks,
Reg

I have a 334A whose AUTO function is not working correctly.  It seeks an initial null then drifts well off of that null.

I've been checking the voltages and waveforms on the A5 board and have bound TP5 is completely dead.  I've checked everything I can think of so far and still haven't found it; however, in my exploration of that board, I found some components that don't appear to be on either of the schematics I have and not sure what they are.  There are a few of them and in two cases, they're tied from collector to base for two of the transistors.

I'm attempting to attach pictures that show these parts but if that fails, I'll add these to an album.  If they do come through, I'm talking about the darker brown components that look a bit like a resistor but are marked a bit differently (e.g. red black black orange brown.  My presumption that is 200,000 with the brown being a tolerance or tempco indicator but don't know.

Anyone recognize these?

BTW, the serial number prefix for mine is 1140A and one of the manuals I have is valid for the serial number; however, I'm not sure if there may be some Service Notes that may have included those parts.  I have a lot of microfiche and the index for the 334A mentions quite a few updates that are not part of a manual (at least I don't think they are).  Unfortunately, the only microfiche I have is a 1972 version so it's quite a bit older than mine.

Thanks,
Barry - N4BUQ

From: "Ed Breya via groups.io" <edbreya@...>
To: [email protected]
Sent: Monday, April 27, 2020 3:00:54 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A - Mystery Parts on A5 Board

Those are 1% tolerance resistors. Using all four bands your 200,000 number is
correct in ohms. The last brown is for 1%.? Ed

From: "Patrick Manning" <pbmanning@...>
To: [email protected]
Sent: Monday, April 27, 2020 2:49:12 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A - Mystery Parts on A5 Board

Barry -

Maybe do a quick check with an ohmmeter? If they're inductors they should be
near shorts at DC.

-Pat

On April 27, 2020 at 3:43 PM n4buq <n4buq@...
mailto:n4buq@... > wrote:


Hi Pat,

I wondered if they're inductors or capacitors. I'm not sure that style
of capacitor was around at that time so an inductor makes sense.

Thanks,
Barry - N4BUQ

----- Original Message -----

> > From: "Patrick Manning" <pbmanning@...
> > mailto:pbmanning@... >

To: [email protected]
mailto:[email protected]
Sent: Monday, April 27, 2020 2:40:59 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A - Mystery
Parts on A5 Board

Barry -

Those appear to be axial inductors - 20mH, 1% if I'm reading them
correctly.

-Pat

> > > On April 27, 2020 at 3:22 PM n4buq <n4buq@...
> > > mailto:n4buq@...

mailto:n4buq@... mailto:n4buq@... > wrote:


I have a 334A whose AUTO function is not working correctly.
It seeks an
initial null then drifts well off of that null.

I've been checking the voltages and waveforms on the A5
board and have
bound TP5 is completely dead. I've checked everything I can
think of
so far and still haven't found it; however, in my
exploration of that
board, I found some components that don't appear to be on
either of
the schematics I have and not sure what they are. There are
a few of
them and in two cases, they're tied from collector to base
for two of
the transistors.

I'm attempting to attach pictures that show these parts but
if that
fails, I'll add these to an album. If they do come through,
I'm
talking about the darker brown components that look a bit
like a
resistor but are marked a bit differently (e.g. red black
black orange
brown. My presumption that is 200,000 with the brown being
a tolerance
or tempco indicator but don't know.

Anyone recognize these?

BTW, the serial number prefix for mine is 1140A and one of
the manuals
I have is valid for the serial number; however, I'm not
sure if there
may be some Service Notes that may have included those
parts. I have a
lot of microfiche and the index for the 334A mentions quite
a few
updates that are not part of a manual (at least I don't
think they
are). Unfortunately, the only microfiche I have is a 1972
version so
it's quite a bit older than mine.

Thanks,
Barry - N4BUQ


> >

>

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On April 27, 2020 at 3:43 PM n4buq <n4buq@...> wrote:


Hi Pat,

I wondered if they're inductors or capacitors. I'm not sure that style of capacitor was around at that time so an inductor makes sense.

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Patrick Manning" <pbmanning@...>
To: [email protected]
Sent: Monday, April 27, 2020 2:40:59 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A - Mystery Parts on A5 Board

Barry -

Those appear to be axial inductors - 20mH, 1% if I'm reading them correctly.

-Pat

On April 27, 2020 at 3:22 PM n4buq <n4buq@...
mailto:n4buq@... > wrote:


I have a 334A whose AUTO function is not working correctly. It seeks an
initial null then drifts well off of that null.

I've been checking the voltages and waveforms on the A5 board and have
bound TP5 is completely dead. I've checked everything I can think of
so far and still haven't found it; however, in my exploration of that
board, I found some components that don't appear to be on either of
the schematics I have and not sure what they are. There are a few of
them and in two cases, they're tied from collector to base for two of
the transistors.

I'm attempting to attach pictures that show these parts but if that
fails, I'll add these to an album. If they do come through, I'm
talking about the darker brown components that look a bit like a
resistor but are marked a bit differently (e.g. red black black orange
brown. My presumption that is 200,000 with the brown being a tolerance
or tempco indicator but don't know.

Anyone recognize these?

BTW, the serial number prefix for mine is 1140A and one of the manuals
I have is valid for the serial number; however, I'm not sure if there
may be some Service Notes that may have included those parts. I have a
lot of microfiche and the index for the 334A mentions quite a few
updates that are not part of a manual (at least I don't think they
are). Unfortunately, the only microfiche I have is a 1972 version so
it's quite a bit older than mine.

Thanks,
Barry - N4BUQ

---

Groups.io Links: You receive all messages sent to this group.

View/Reply Online (#105647): /g/HP-Agilent-Keysight-equipment/message/105647
Mute This Topic: /mt/73312121/308147
Group Owner: [email protected]
Unsubscribe: /g/HP-Agilent-Keysight-equipment/leave/defanged [pbmanning@...]

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From: "Patrick Manning" <pbmanning@...>
To: [email protected]
Sent: Monday, April 27, 2020 2:40:59 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 334A - Mystery Parts on A5 Board

Barry -

Those appear to be axial inductors - 20mH, 1% if I'm reading them correctly.

-Pat

On April 27, 2020 at 3:22 PM n4buq <n4buq@...
mailto:n4buq@... > wrote:


I have a 334A whose AUTO function is not working correctly. It seeks an
initial null then drifts well off of that null.

I've been checking the voltages and waveforms on the A5 board and have
bound TP5 is completely dead. I've checked everything I can think of
so far and still haven't found it; however, in my exploration of that
board, I found some components that don't appear to be on either of
the schematics I have and not sure what they are. There are a few of
them and in two cases, they're tied from collector to base for two of
the transistors.

I'm attempting to attach pictures that show these parts but if that
fails, I'll add these to an album. If they do come through, I'm
talking about the darker brown components that look a bit like a
resistor but are marked a bit differently (e.g. red black black orange
brown. My presumption that is 200,000 with the brown being a tolerance
or tempco indicator but don't know.

Anyone recognize these?

BTW, the serial number prefix for mine is 1140A and one of the manuals
I have is valid for the serial number; however, I'm not sure if there
may be some Service Notes that may have included those parts. I have a
lot of microfiche and the index for the 334A mentions quite a few
updates that are not part of a manual (at least I don't think they
are). Unfortunately, the only microfiche I have is a 1972 version so
it's quite a bit older than mine.

Thanks,
Barry - N4BUQ

On April 27, 2020 at 3:22 PM n4buq <n4buq@...> wrote:


I have a 334A whose AUTO function is not working correctly. It seeks an initial null then drifts well off of that null.

I've been checking the voltages and waveforms on the A5 board and have bound TP5 is completely dead. I've checked everything I can think of so far and still haven't found it; however, in my exploration of that board, I found some components that don't appear to be on either of the schematics I have and not sure what they are. There are a few of them and in two cases, they're tied from collector to base for two of the transistors.

I'm attempting to attach pictures that show these parts but if that fails, I'll add these to an album. If they do come through, I'm talking about the darker brown components that look a bit like a resistor but are marked a bit differently (e.g. red black black orange brown. My presumption that is 200,000 with the brown being a tolerance or tempco indicator but don't know.

Anyone recognize these?

BTW, the serial number prefix for mine is 1140A and one of the manuals I have is valid for the serial number; however, I'm not sure if there may be some Service Notes that may have included those parts. I have a lot of microfiche and the index for the 334A mentions quite a few updates that are not part of a manual (at least I don't think they are). Unfortunately, the only microfiche I have is a 1972 version so it's quite a bit older than mine.

Thanks,
Barry - N4BUQ

On April 27, 2020 at 3:22 PM n4buq <n4buq@...> wrote:


I have a 334A whose AUTO function is not working correctly. It seeks an initial null then drifts well off of that null.

I've been checking the voltages and waveforms on the A5 board and have bound TP5 is completely dead. I've checked everything I can think of so far and still haven't found it; however, in my exploration of that board, I found some components that don't appear to be on either of the schematics I have and not sure what they are. There are a few of them and in two cases, they're tied from collector to base for two of the transistors.

I'm attempting to attach pictures that show these parts but if that fails, I'll add these to an album. If they do come through, I'm talking about the darker brown components that look a bit like a resistor but are marked a bit differently (e.g. red black black orange brown. My presumption that is 200,000 with the brown being a tolerance or tempco indicator but don't know.

Anyone recognize these?

BTW, the serial number prefix for mine is 1140A and one of the manuals I have is valid for the serial number; however, I'm not sure if there may be some Service Notes that may have included those parts. I have a lot of microfiche and the index for the 334A mentions quite a few updates that are not part of a manual (at least I don't think they are). Unfortunately, the only microfiche I have is a 1972 version so it's quite a bit older than mine.

Thanks,
Barry - N4BUQ

hi,

Wanted: HP 8445b Preselector .

Please contact me off-list.

thank you,
rick