In the last few weeks I have been setting up my K3S with transverters and using the on board 2 tone generator and a 28 MHz transverter drive I have been delighted with the TX performance. The 3rd order TX IMD at the level I require is -58dBc! It is how radios should be. Tonight I am making these measurements on 6m at various power levels and they are awful! Not only that but occasionally I see some strange gain jumps, usually when I first start the 2 tone test. I have read that this hunting is due to the power control loop.
So I hope that adding the PA means that I am doing something wrong with the 2 tone setup. I have the compression set to zero but I think that this is bypassed when internal 2 tone generator is active? I cannot get 3rd orders better than -26dBc on 6m at any power level. I read about the ALC 'hunting' but when on LSB with 2 tone on I see no ALC indication at all so maybe this is the problem? At 10W there is an awful noise pedestal as well. I hope that this is not AM noise as seen on the IC-7300. Please tell me that this I an adjustment error on my part or I will have to add a PA to the transverter port for 6m.
Help!
73
Conrad PA5Y
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