Opek HVT-400B hears, but isn't heard

[VK2HLG]

Hello everyone.

Any ideas what is wrong with my installation of an Opek HVT-400B? I am trying to use in for WSPR on 20m, and while it seems to hear plenty and tunes to 1:1 SWR for transmit, no one hears me, not even a station within walking distance.

Here's the installation (I don't know why we can't embed remote-hosted photos here):

http://i292.photobucket.com/albums/mm1/hazydavy99/DSC_0899_zps3b0eccf4.jpg

http://i292.photobucket.com/albums/mm1/hazydavy99/DSC_0898_zps40abe0df.jpg

That's the roof of a garden shed. The gray corrugated parts are steel; the white parts are transluscent plastic. The base of the antenna is about 2.5 meters (7 feet or so) in the air. It's not high, but it's higher than a car, which is what this antenna was intended for.

The antenna's fed by about 50 meters of coax, connected to an ICOM 7200 via a Palstar AT2K. Like I said, 1:1 SWR.

Any advice? Thanks.

David VK2HLG

[W4JST]

Another radio within walking distance cannot hear you?

You should be heard on a nearby radio even WITHOUT an antenna connected.

Check for power output at the radio. Check the microphone etc. Try FM or CW instead of SSB.

[VK2HLG]

Ah, now I am getting out. I had the wrong audio output device selected in the configuration of the WSPR client. It's the one that says "USB Audion CODEC."

Thanks!