Hi again all,
Lokks as though my problem has nothing to do with spurs, but would like to obtain the test software anyway.
The problem with the analyser is that the main oscillator becomes regenerative in bands 2 thru 4. (mostly band 2)
playing about caused the problem to be repeatable , when in band 2 the output takes off at around 2.7 GHz and outputs around + 10 dBm or more
doesnt appear to matter what frequency in band 2 is used, the ouput takes off at the same freq
Adjust the board cover and all comes good, tighten another screw and it comes back.
Anyone seen something similar ? Any ideas?
If one of the pin switches that switched in the b2 filter was dead and represented a high impedance it's possible, I suppose, that the alc is compensating but the input is twitchy as it's unloaded and so takes off with a little feedback? Sound reasonable?
Thanks Greg
Hi All,
> I'm repairing an 8714B and am in need of the the performance test
software,
HP part number 08712-10011. I can find no reference to it on the agilent
> site.
>
> I have a problem with the analyser which I think is related to spurs? Out
of
the main osc is the output signal and a LO signal around 25 to 30 dB down.
> I'm not sure if this is what is referred to as spurs or whether they are
> solely referring to fractional N PLL reference osc spurs.
>
> This LO component on the output affects the dynamic range of the narrow
band
receivers as it interfers with the receiver mixing process.
>
> Mostly affects band 2 but noticeable on bands 2 thru 4.
>
> So looking for the software to adjust the spurs, if this is the spurs
being
referred to in the .
>
> Alternatively, if someone knows which test frequency to use for which
> adjustment point that would be almost as good.
>
> Or if it's not these spurs the software adjusts, then anyone have any
ideas
as to how the LO is bleeding thru tot he main osc port? and if so, any
> suggested cure?
>
> Thanks
>
> Greg
> ---------
> g c d [delete everything else] A.T. austarmetro.com.au
>
>