[time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

Bill Byrom time at radio.sent.com
Thu Dec 22 15:54:22 EST 2016

Read about the synthesizer design of that generator here:


Dave, looking at the graph you posted it appears to me that the shift is
10 Hz, not 100 Hz. It appears to me that is an audio spectrogram. I have
no idea if the frequency shift is in the generator or receiver.


Bill Byrom N5BB

On Thu, Dec 22, 2016, at 10:10 AM, David wrote:

> On Thu, 22 Dec 2016 12:39:27 +0000, you wrote:


>> But I find it a bit odd that HP would have a 1 Hz software option
>> on this
>> instrument, if the instrument jumped up/down 100 Hz.


>> Now I don't yet have the 1 Hz option programmed in, and it might well
>> change the behavior completely, but I'd still like to find a
>> way, if one
>> exists, of checking this with the equipment I have.


>> The signal generator is no longer supported, but I could try my
>> luck seeing
>> if there are any known problems with this unit, or firmware upgrades
>> available - currently revision 29, May 1991.


>> ...


>> Dave


> I agree with Bill, maybe something is going on at the other end.


> While I do not expect this sort of thing from HP, could they have

> deliberately designed the sweep generator to include those 100 Hz

> bumps unless the 1 HZ software option was purchased?


> Like Paul, I would not expect the kind of stability you need from a

> sweep generator but that 100 Hz jump is just weird.  It does kind of

> remind me of popcorn noise but without a time scale and a longer

> record, it is difficult to tell.

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