[UK-CONTEST] Detuning TX antenna on receive.

[David Gould]

I have just put up a K7TJR RX 4-square in preparation for next 
weekend's contest.

The TX Inverted-L is about 80/90m away from the 4-sq.

Following the common held view, and also shown very strongly in EZNEC 
modelling, I have built the facility that the TX antenna is detuned 
on RX.. but out of interest I put in  a switch to override the detuning.

After a range of listening tests last night on US (inc west coast) 
and EU stations on the front and off the back I could not detect any 
difference when the TX antenna was resonant or detuned.

Has anyone else done similar tests and noticed any difference?  And 
if so what sort of degradation did you notice when the TX antenna was 
*not* detuned?

BTW the K7TJR 4-SQ..  was working brilliantly, I hadn't appreciated 
that it would be so low noise as well as directional, though it 
probably could do with a small preamp to equalise the gain to reduce 
knob twiddling when switching.

73,
Dave, G3UEG