[TenTec] Jupiter intermittent receive

[Stan Gammons]

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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