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Hi all,

I'm new to this group, but not so new to vintage HP and other test
equipment. I'm sure there are a few familar names here!

I have recently found a nice clean 5100A/5110A synthesizer set and
would like to get it up & running.
I tried the 5110A and found two problems:

1. The 1 MHz output is fine but none of the other outputs are there

2. The oven temp meter reading just keeps getting higher & higher
till the meter goes off scale...obviously I have not left it in
standby mode!

Help! I really need some advice and especially a set of manuals. I am
located in Melbourne Australia and would be happy to pay for copying
& postage costs if anyone can help.

Thanks,

Morris Odell

Hello Morris!

In the Synthesizer Driver,
there is a step recovery comb generator which was driven by the 1MHz
Signal. From those comb generator the ouput was filtered through a
lot of filtersbanks to filter out the many frequencies that are
available at the outputconectoRS at the rear.
I expect that something around the SRD was wrong, the SRD is located
(when i rememer right) in an oven, too so maybe that oven is defective.
But maybe the normal oven for the xtal has a little overshoot, too or
is defective.
I have the Manuals for those both units at our Ham-Radio clubstation.
I have to look there in the next days.

Jorgen

PS.No reply from Jose,will send another message.BG.

Jose replied to me yesterday after seeing the above. It seems he is just
as disorganised as the rest of us.

Well, no so... at least I recalled your message was somewhere in the pile of unanswered ones ;-)!

Sorry for the delay!

Regards,

JOSE

PS to BG: I think I will get the Eddy :-)!
----------------------------------------------------------------------
73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN) - Loc: IM99SM

Vintage Radio:
Vintage Test Equipment:
European Boatanchors List:

--- In hp_agilent_equipment@..., Morris Odell
<morriso@v...> wrote:

Hi Jorgen,

have a manual for the driver coming from ebay so will look into it
properly when I have the information I need.

I'm sure a new SRD will be impossible to find :-( I may have to find
some other way to generate harmonics....it can't be that hard with 21st
century ICs.

Because of it hasn't to be a microwave SRD (as in the most other cases
of SRD-use) i think it is possible to substitute it with other types
of diodes which also "snap", but unwanted, or better said, not build
for to be a SRD. A BA244 Tuner Switching Diode will work well.
A few years ago i have "Measured" (Not a perfect measurement,
fast thrown together) a step with a slew that nearly matched the
rise time of the scope (Tek 2465B, 400MHZ) so that i think it will do
a nice job in there. if it is not available down under, i send
together with the Manual.

I have
the Manuals for those both units at our Ham-Radio
clubstation. I have to look there in the next days.

Is it possible to get a copy of the 5100A manual? All costs covered of
course...

I will take a look in our clubstation the next days for it,
i think it is possible.


Jorgen

--- In hp_agilent_equipment@..., Morris Odell
<morriso@v...> wrote:

Hi Jorgen,

Hi Morris,
i need your adress.
please mail it to me to

dj0ud at web dot de (at=@; dot =.)

Jorgen

Hi:

I joined this group on the 17th and asked for a daily digest, but none
have arrived, so have missed a few postings.

I repaired my synth many years ago by replacing the SRD with the
biggest slowest one I could find. But it has died again.

The problem is in getting a SRD with a lifetime that's long enough to
work with a 1 MHz input signal. Since diode lifetime goes up with
temperature, HP used a heater to increase the lifetime and thus get a
stronger set of combs out of the diode.

The idea is that during fordward conduction the diode stores charge
and when the input polarity reverses the diode keeps conducting
(because of the stored charge). When the stored charge is all removed
the diode "snaps" to the reverse voltage. In the ideal case the
stored charge runs out when the reverse voltage is at it's negative peak.


In this case that would take a huge amount of charge storage and so
it's a case of the more charge the higher the output.

If someone knows of a large long lifetime SRD (or it may be called a
fast PIN, or noise diode) that may be a good choice.

Have Fun,

Brooke Clarke, N6GCE