I tried DeOxit on the connectors and I've resoldered practically all of
the vias on the RF board along with all other connections on both the RF
board and filter board. The Jupiter just doesn't seem like it's as
sensitive as my TR7. I can hear stations on the TR7 and all I hear on
the Jupiter is noise. I'm beginning to wonder if it might be an AGC
problem. Anyone here know what the voltage should be on the AGC pin on
the connector which connects the RF board and DSP board? With no signal
and an S9+20 signal, RF gain 100%, I have .57 volts on the AGC pin.
With the RF gain at 0%, I have 1.57 volts on the AGC pin. From about
30% to 100% RF gain, the voltage stays at .57 volts.
73
Stan
KM4HQE
On 04/04/2017 02:06 PM, Stuart Rohre wrote:
For any intermittent in any radio brand/ model, the first thing for
you to do is the following:
One by one unplug and replug in carefully all jumper cables, flat
cables, etc. on the rig boards. IF any show obvious corrosion you will
need to procure some DeOxit contact cleaner and apply as per
instructions. This was carried by some Radio Shack stores, and hifi
stores or ON Line.
If there are band switches with movable brass silver contacts you need
to place a drop of De-Oxit on each contact area, and rotate the switch
back and forth.
Usually the above will solve these type of problems. If not, examine
all solder joints for correctness of solder melting, shiny appearance,
wetting, etc.
Examine any antenna contact jacks with spring loaded fingers to grip
the matching connectors.
TT uses a crimp on miniature coaxial connector that could work loose
over time, check those.
-Stuart Rohre
K5KVH
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