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Joined: Mon, Aug 1st 2011, 09:03 Roles: N/A Moderates: N/A

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IC-706 "Mark 1" Silent on LSB and USB Sep 15th 2011, 01:10 2 6,835 on 15/9/11

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IC-706 "Mark 1" Silent on LSB and USB kb3dfz on 15/9/11

I have an ICOM IC-706 "Mk1" radio that I picked up used and have been using primarily as a 2M base. Now I'm attempting to use the HF capabilities and find that I can not hear anything in LSB or USB modes at all. When I switch my mode over to LSB or USB the radio is silent (even with squelch all the way open).

Beside it on the bench, I have an IC-735 that can pick up. I can swap antennas and the problem sticks with the IC-706. I can Tx from the 706 and hear it on the 735, so transmit seems to work (though I haven't tested it over any sort of range). Tx from the 735 to the 706 do not go through.

If I do open the squelch, the Rx light turns on. If I switch to WFM, I can hear a variety of radio stations through the 7Mhz range. AM mode also seems to work. I have not tested RTTY.

In troubleshooting, I have done a complete reset on the 706. As far as I can tell, there is no "PL Tone" type settingo n the HF side.

My best guess is a bad filter or connection. Looking for any pointers on this issue.

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