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Re: Multiband QCX


 

Likely the 80 or 40M version, however they are all the same save for the tuned circuits.

Starting point? would be T1 made untuned then the RX wors on many band
limited by the LPF filter.? If broad cast breakthough is an issue then a highpass
filter with a low frequency cutoff of 1.7mhz is needed.? Also 160M can be done but
due to the handling of the Si5351 opposing sideband rejection is not very good.
I'd limit RX to 80 through 10m?

The TX is far harder, because to get efficiency out of the class E the fets it have
to be? feeding into a tuned matching system?so really a LPF for each band d
esired and also L4/C30 as a pair for each band. TX on 160 is doable, 10M
may be very poor on power out.? ?To do all this a band switched output
filter is a must (Its also used by the RX).

Building several would likely be easier as 80M and 40 is rather poor during
the day, 30M holds up ok at night, and 20M fades at night.
60M is also possible but CW only (USA).


Allison
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