[hpsdr] No RF coming in through Penny Whistle

Graham / KE9H KE9H at austin.rr.com
Sun Jan 27 20:14:01 PST 2013


Signals won't go backwards through the Pennywhistle amplifier.

You need an antenna relay to route around the amplifier when
you are in receive, and also a low pass filter for the Pennywhistle 
when you are in transmit.

--- Graham / KE9H


On 1/27/2013 9:23 PM, K1TCP Grigsby wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> I just completed my Penny Whistle build. Everything seemed to go 
> together well. I ran the couple of tests in the manual, using the 
> antenna tuner, since I had one, and then setting the trim pots.
> Antenna VSWR looked good across all bands, about 1.1 - 1.3.
> I wasn't pulling 20mA before adjusting the trim pots, more like 8mA. I 
> didn't think it was a huge deal, I could be wrong? I adjusted the 
> trimpots accordingly, bumping both up about 460mA. Voltage looked 
> good, about 13volts.
> I can hit the bias control, and the current pull reads about 980mA, 
> which is to be expected I'd think. When I transmist through it with 
> the transceiver, it peaks to about 2.20 amps sometimes, once it warms 
> up some.
> I know I am getting out on the TX. I can hear myself on another rig on 
> 40 meters running PSK. I assume it's RF from one antenna to another. 
> But I don't hear anything. I thought it was just seriously attenuating 
> the incoming RF, but I unplugged the coax from the output BNC, and the 
> waterfall never changes. Just weak reception. If I plug the antenna 
> coax back into the transceiver, the waterfall springs to life. I've 
> tried swapping coax cables. I ran some continuity tests, and I get 
> tone from BNC center on BNC input and output connector. But I also get 
> tone from BNC center to BNC outer, which seemed odd, but some of the 
> transformers seem make these connections?
> Still searching for ideas, thought I would bounce it off the group.
> Running an Ensemble RXTX, 20/30/40.
> Thanks,
> Bryan
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