[600MRG] w0yse RX only this session

[Dave Riley]

Hi Neil,

Am receive only these days and have come to the end of the road as for 
SNR and net received stations on 630m WSPR..

Things were most fine ever when I hung a modified Dallas Lankford low 
noise vertical and it seemed that between the high noise floor on 630m 
plus the power lines that this would be all that I could expect.. Was 
the best results so far. It has its own ground thus no loops..
The best improvement I found was to run 72 ohm twin lead along the 
ground with a 1:1 toroid at each end which really dropped the common 
mode ingress..

Then I tried a 5 turn 5' dia. loop and couldn't see much difference 
between it and the passive E-Probe but now that DX is scarce I see the 
difference between the vertical and the loop...

The one advantage has been that the power lines are mostly in the loop's 
null and I think that this has made a difference..

The last 'discovery' was to remove the so called LNA from the loop and 
just run the twin lead directly to the R-75 which is probably as low a 
noise figure as it goes these days.. Removing the LNA dropped the noise 
by 2db and that becomes the end of this road..
Now the difference between antenna and dummy load is 5db noise / no 
noise, so why add LNA??

Now am using a portable level receiver and will go further in to the 
woods to see if the noise goes down any, also to swing the loop for 
minimum noise off the power lines..  Maybe going to shielded loop might 
make a difference...

Any comments or suggestions?

Looks like you are doing very well, so 73s from Dave AA1A / W1FRV