HFU HF Underground
Technical Topics => The RF Workbench => Topic started by: Matt285 on July 05, 2019, 1257 UTC
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Yesterday I noticed my radio seemed to be dead on receive. Especially being that it was July 4th and a lot of people were off work. It also seemed to have Shortwave splatter across all of 40 meters as well as other bands. My attenuator is working in reverse. I have to turn it 'on' to hear anything. I keep having birdies popping up all over also. I did make a contact on 20m USB last night. I'm worried it may have taken in some voltage some how. Any thoughts?
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Sounds to me like you may have diode rectification of a strong local signal going on in your antennae system. Or perhaps the noise blanker is set a bit too high?
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I've never had an issue with local transmitters. I will double check the noise blanker setting. I'm hoping its something simple. It's been a good rig so far
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Also check preamp, set it to off.
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Finally sent the Icom off for repair a week ago. The following repairs were made by the tech.
RF Pre-amps blown , replaced
RF ATTN Diodes Blown , Replaced
RF/IF resistors , there were 3 of them cracked.
Labor 1.8 hours plus parts
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Sounds like either a lightning hit, or the transmit/receive switching failed to operate correctly.
+-RH
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Have a gas discharge arrestor inline?
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Sounds like either a lightning hit, or the transmit/receive switching failed to operate correctly.
...or tx'ing w/o an antenna would do the trick!