Re: QCX Mini for 17M - usability on 20M & 15M? #qcxmini


Curt wb8yyy
 

Dave

If you examine multiband rigs you will see that they employ a low pass filter typically for 2 adjacent bands. When properly adjusted for harmonic suppression I suspect in should do 20m. On 15m it would be operating into mismatch not ideal. Best way to see this is looking at filter response for the 17m filter, the rsgb article referenced by Hans may have the plots.  The tuning of the class E transmitter is another factor. Receive on 15m might be reasonable with just a few dB of loss. 

Curt

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