Re: 40 m QCX on the air with an interesting enclosure.
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Hi Georges
I expect with 380 and 580, the "Low" was out of the range of adjustment of the trimmer. Your values sound reasonable to me. But I have not had time to extensively investigate lowering the center frequency.?
I added your values and comments to the mods page? so that it is useful to other readers.
73 Hans G0UPL ?
On Fri, Dec 15, 2017 at 9:30 PM, <f6dfz@...> wrote: Hi Andy
Here are my values :
- 3.8 480
- 4.8 480
- 8.2 480
- 8.3 430
- 8.4 530
For 8.3 and 8.4, I first tried 380 and 580, but the LO value gave no definite null. With these values, LO and Hi null are well defined.
I checked with my HP signal generator the opposite sideband, and I believe there is over 40 dB of rejection as, even with ear splitting signal on the selected sideband (-47 dBm !) I couldn't detect the opposite sideband.
Perhaps Hans could confirm if these values for 8.3 and 8.4 are correct for a 480 Hz central frequency.
Best regards
Georges F6DFZ
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