Steve M <steven@...> wrote:
The sensitivity of my QMX+ is pretty good, but I don't have a spec for
you.? I have not had any problems with the receiver.? Being a QRP rig,
you will be able to hear many more stations than can hear you.? I have
been using mine primarily for FT8 and I am almost always giving the
other station a much better signal report than they are giving me, which
tells me the receiver has more than adequate performance for 2 way
communication.
It does cover all of the bands on your list, except 8m.? It also covers
11m for the regions where that is allowed.
Thanks for all the responses!
Actually 8m is forbidden where I live (Poland, IARU 1), so I wouldn't use
it anyway.
My issue (and my thinking) is this. In the last CQ WW CW I was able to
contact almost all stations I heard, so maybe the sensitivity is actually
bad compared to what I'd get on a rig like Yaesu? Maybe I didn't hear
these weak stations that wouldn't hear me from 5 W?
I only have QMX (and QDX) and I'm pretty happy with it, but I don't have
comparison, and I'm thinking about something else (QMX+ is an option,
because I'd like to try some higher bands too).
I also tried increasing the output power with QCX's 50 W PA (with QDX). PA
ended up self-oscillating and frying four chips in the QDX's input stage
(plus overheating PA's input attenuator resistors). I was able to replace
the chips, but I'm reluctant to connect it again.
Maybe some low-pass filter just before the gates of the transistors would
prevent it, but looking at the design I can't think of an elegant way to
do it and I don't want to experiment and fry another rig...
