Re: HP3580A Repair- Spurious Signal
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Hi Nigel, thanks for the offer but I don't think that parts from an 8559 being a Ghz capable SA would be compatible with either the 3580A (50Khz) or a 8556A plugin which I would like to buy, but I do appreciate you thinking of me, maybe someone else on the forum could make use of them?? Cheers Steve.
On Fri, 9 Oct 2020, 6:54 am nigel adams via , <bristol.rell6l= [email protected]> wrote: I have a ¡®second LO and YIG¡¯ assy from an HP8559 SA which I just uncovered from a clear out... must have had it for years....
If there is any interest I will part with it for a reasonable offer...
Note: I am in UK
Unit is unknown condition electrically as I have no means of testing it.
Mechanically it looks good.
Can¡¯t recall why i kept it as I don¡¯t have a comparable analyser now...
Will post some images when I am back at home...
Just wondering if any parts are common to any other generator or analyser...
Would prefer to find a good home for it than recycle...
Regards
> On 8 Oct 2020, at 20:25, Bruce <bruce@...> wrote:
>
> ?Steve let me look.? I could buy it and ship it to you.? One thing I learned from using the 141/8555 series is it is a nice feature to have an IF for each "RF" unit - avoids wer and tear on the mating connectors and eliminates re-calibration each time.
>
> Cheer!
> Bruce
>
>
> Quoting Steve Dench <sjdench48@...>:
>
>> Hi Bruce,
>> When I do an Ebay search it only shows one, that comes with 3 other units,
>> while the price for the 4 items isnt bad, the postage to me in Australia
>> for such a heavy package (of the 4 plugins) is way out of my budget. Its
>> possible that other 8556s that are listed do not show up for me as they
>> problably dont have international postage. (just a guess).
>> Thanks for your reply. Steve.
>>
>>> On Thu, 8 Oct 2020, 1:28 pm Bruce, <bruce@...> wrote:
>>>
>>> There are several HP 8556s on E-bay
>>>
>>> Cheers!
>>>
>>> Bruce
>>>
>>> Quoting Steve Dench <sjdench48@...>:
>>>
>>> > Hi Bernie
>>> >
>>> > I have only been able to estimate the 90Hz signal by injecting a signal
>>> > into the input from a sig gen at a high amplitude to override the
>>> spurious
>>> > signal and see where it sits on the waveform. I actually suspect that the
>>> > spurious signal is nothing like 90Hz but a signal close to the LO signal
>>> or
>>> > a harmonic of it.
>>> > Regarding the mixer, I have replaced the IC and the balance trim pot to
>>> no
>>> > effect.
>>> > I totally agree that the best way to fix it may be another 3850. I have
>>> for
>>> > some time been on the lookout for a HP8556 plug in for my HP141T that
>>> would
>>> > solve all the problems.
>>> > Thank you for your suggestions
>>> > Steve Dench
>>> >
>>> > On Thu, 8 Oct 2020, 11:07 am Ham Radio, <bernard.murphy@...>
>>> wrote:
>>> >
>>> >> Is the spur exactly 90 HZ?? That might be a clue.
>>> >>
>>> >> I would double check the mixer trim pot connections with an ohm meter on
>>> >> low range and also reflow the solder of joints.
>>> >>
>>> >> You might need another 3580 to find the spur.? ?:-(
>>> >>
>>> >> --
>>> >> Regards, Bernie Murphy
>>> >>
>>> >>
>>> >
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