The attenuator drive is on A16 brd. in the RF section. It is a current drive to the solenoids in the attenuator. The attenuator is 10dB, 20dBa, 20dBb, 20dBc sections.

The attenuator steps are:
0dB = bypass all pads
10dB = 10dB in, bypass all 20dB pads
20dB = bypass 10dB pad, 20dBa in, bypass 20dBb, 20dBc pads
30dB = 10dB, 20dBa in, bypass 20dBb, 20dBc pads
40dB = bypass 10dB, 20dBa pads, 20dBb in, 20dB in
50dB = bypass 20dBa, 10dB in, 20dBb in, 20dB in
60dB = bypass 10dB, all 20dB pads in
70dB = all pads in

The pads inside the attenuator are from input to output 10dB, 20dBa, 20dBb, 20dBc.

The truth table is in the RF section manual and on the A16 schematic.

Don Bitters

It is rectangular. The Viking connector is for the 4/18 Ghz green old attenuators or the driver box 11713A On Monday, March 13, 2023, 06:30:33 PM GMT+1, Bruce <bruce@...> wrote:

Viking ???? If it is round, it is probably Viking


Quoting "jfphp via groups.io" <jfphp@...>:

Hello,
I am looking for the commercial brand/reference of the female 10?
pins dip female connector mating the male connector of the step?
attenuator.
Thank you.

It is rectangular. The Viking connector is for the 4/18 Ghz green old
attenuators or the driver box 11713A

Hello,
I am looking for the commercial brand/reference of the female 10 pins dip female connector mating the male connector of the step attenuator.
Thank you.

From: [email protected] [mailto:[email protected]] On Behalf Of RubenRubio
Sent: 13 March 2023 09:37
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 5086-7337 *Yig Oscillator issue*

?

I made this plugin out ot two separated parts sets: one comprises everything but A1, A2, keyboard and front panel. The second set includes the boards and mechanical parts I needed to complete the puzzle plus some extra chassis parts, SYTM, PMI and other microcircuits, also extra A3 board without ROMs and A10 motherboard.

My point is that the YO comes with it's appropiate resistors in A8, I've checked that.

Paul: I uploaded the OSM that I have, don't know what CCT or those aligner PCBs are, sorry.

As I told in the earlier posts in this very thread, there's is no output?neither on the auxiliary output nor on the direct output of the oscillator. And the signal and supplies are present in the YO board test points.?In my eagerness to check the whole set, I have referred back to the YO driver.?

I'll read the manual again looking for that mA/Hz table and more troubleshooting info. Also redundant check to be sure.

Regards,
Ruben

Attachments:

• 1.jpg
• b.jpg
• WhatsApp Image 2023-03-13 at 10.19.23.jpeg
• 9018-05856 HP 83592A OSM.pdf

Hi Ruben



I thought I asked this question but apparently not on looking at the
history , sorry if I am going over old ground

You have made the unit out of 2 units and no output on the Aux socket
on the back panel the big question hear again from memory

But is the yig PCB the matching one for the yig in the sweeper as they
are individually set to the yig and as a service item supplied as PCB
and YIG together

When you have the Maine yig giving output

There should be a lineariser PCB with lots of pots on it this should
be the yig multiplier PCB again you MUST have the matching board as
they are individually set up to the Yig

The PCB can be realigned but it could take about 3 hours the first
time you do it with all the messing about with fixed resisters etc

I assume you have the Full Service manual including CCT



From: [email protected]
[mailto:[email protected]] On Behalf Of
RubenRubio
Sent: 19 February 2023 12:18
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 5086-7337 *Yig Oscillator
issue*



Hello everyone!

Although this topic belongs to my 8350B restoration thread I did
almost a year ago, I want to imprint some relevance. Shortly, my 8350B
mainframe doesn’t have main transformer. Instead of that I feed it
with three external sources.

These days I managed to get a 83592A plugin in two separated parts
sets. I have put them together and after some power supply issues
(classic shorted tantalum), there’s no errors displayed. But no RF
coming out. Unleveled LED lits in the front panel. Also no RF at the
rear aux output, nor at the exit of YO itself (God shake! it’s tricky
to access microcircuits!).

Following the signal path and troubleshooting notes on the manual, I
check that the +5, +20, -40 supplies for the YO are present. Also the
ON -10 volt signal and the M composite signal on scope. At first
glance, G bias signal (which should be -2 volt) was almost 0. I check
the associated components and after turning a pot, -2 volt come back.

Still no signal at the output of the oscillator :(

Is there any other way to check the YO before officially declaring it dead?

Regards,
Ruben

Hi Ruben



I thought I asked this question but apparently not on looking at the history , sorry if I am going over old ground

You have made the unit out of 2 units and no output on the Aux socket on the back panel the big question hear again from memory

But is the yig PCB the matching one for the yig in the sweeper as they are individually set to the yig and as a service item supplied as PCB and YIG together

When you have the Maine yig giving output

There should be a lineariser PCB with lots of pots on it this should be the yig multiplier PCB again you MUST have the matching board as they are individually set up to the Yig

The PCB can be realigned but it could take about 3 hours the first time you do it with all the messing about with fixed resisters etc

I assume you have the Full Service manual including CCT



From: [email protected] [mailto:[email protected]] On Behalf Of RubenRubio
Sent: 19 February 2023 12:18
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 5086-7337 *Yig Oscillator issue*



Hello everyone!

Although this topic belongs to my 8350B restoration thread I did almost a year ago, I want to imprint some relevance. Shortly, my 8350B mainframe doesn’t have main transformer. Instead of that I feed it with three external sources.

These days I managed to get a 83592A plugin in two separated parts sets. I have put them together and after some power supply issues (classic shorted tantalum), there’s no errors displayed. But no RF coming out. Unleveled LED lits in the front panel. Also no RF at the rear aux output, nor at the exit of YO itself (God shake! it’s tricky to access microcircuits!).

Following the signal path and troubleshooting notes on the manual, I check that the +5, +20, -40 supplies for the YO are present. Also the ON -10 volt signal and the M composite signal on scope. At first glance, G bias signal (which should be -2 volt) was almost 0. I check the associated components and after turning a pot, -2 volt come back.

Still no signal at the output of the oscillator :(

Is there any other way to check the YO before officially declaring it dead?

Regards,
Ruben

From: [email protected] [mailto:[email protected]] On Behalf Of RubenRubio
Sent: 19 February 2023 12:18
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 5086-7337 *Yig Oscillator issue*

?

Hello everyone!

Although this topic belongs to my 8350B restoration thread I did almost a year ago, I want to imprint some relevance. Shortly, my 8350B mainframe doesn’t have main transformer. Instead of that I feed it with three external sources.

These days I managed to get a 83592A plugin in two separated parts sets. I have put them together and after some power supply issues (classic shorted tantalum), there’s no errors displayed.?But no RF coming out.?Unleveled LED lits in the front panel.?Also no RF at the rear aux output, nor at the exit of YO itself (God shake! it’s tricky to access microcircuits!).

Following the signal path and troubleshooting notes on the manual, I check that the +5, +20, -40 supplies for the YO are present. Also the ON -10 volt signal and the M composite signal on scope. At first glance, G bias signal (which should be -2 volt) was almost 0. I check the associated components and after turning a pot, -2 volt come back.

Still no signal at the output of the oscillator :(?

Is there any other way to check the YO before officially declaring it dead?

Regards,
Ruben

I got it

I will measure again using the first harmonic band. Will post here the
exact results.

I am reluctant to think that the oscillator is dead, I hope that there
is more ways to check it. The service manual don’t have any more. My
knowledge is limited, but I usually have intuition for these things.

Thanks Paul

Regards,
Ruben