you are talking about the 8444 not the 8443, the 8443 actually does not require a 500MHz signal
Alan Melia <Alan.Melia@...> wrote: Hi, just a though triggered by Chuck's posting. Some of the connectors for
the tracking gen were fitted as an "update" I think (without looking at my
frame) there is another cable inside from the back of the frame and the
plug-in bay. So there are a lot of connectors in series. It would only take
one of the 2 or 3 cables/conns from the LOs to the TG to be open for the Tg
to produce no output. I hesitate on this because without checking the manual
I am not sure whether you would get a marker in that state. Another though
but I dont remember whether it refers to this unit is that some RF heads
dont output the third LO with is 500MHz and this must be generated locally
in the TG . failure of this unit there would mean no output too. You dont
say whether you have measurable output from the TG (scope??) and whether it
is actually on the right frequency (I would imaginne the output goes via a
100MHz LPF so one osc off and no signal). Separate test equipment is better
than trying to define the problem all in the same two units.
Alan G3NYK
----- Original Message -----
From: "Chuck Harris" <cfharris@...>
To: <hp_agilent_equipment@...>
Sent: Friday, November 16, 2007 2:41 PM
Subject: Re: [hp_agilent_equipment] Re: HP-8443A Tracking Generator Problems
One very big problem with the 141T frame and its plug-ins, that can cause
many a vexing symptom, is the D style connector on the back of each
plug-in.
The aluminum framework that holds these D style connectors is too thin and
poorly braced to handle the insertion force necessary to properly mate the
connectors... particularly when the connectors get older, and dry of all
lubricant film... so, it just bends out of the way. Generally this
results in
a partially working SA.
Perhaps this has happened to yours?
-Chuck Harris
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