[600MRG] w0yse RX only this session

[Neil Klagge]

Hi Dave, thanks for the email and information. Very interesting.

I have a question about your 5 Turn Loop. Did you tune the loop to resonance, or not?

Interesting about removing the LNA. I should try that with my attic loop antenna.

What is the reason you use 75 on twin lead as opposed to 75  ohm coax?

Thanks again for your email. 

Neil, W0YSE

Sent from Neil's iPhone

> On Jan 23, 2023, at 13:18, Dave Riley via 600MRG <600mrg at mailman.qth.net> wrote:
> 
> 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
> 
> 
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