Hello Markus, Stefan, Paul,
Is there any way of guessing the ERP of the 1570 Hz (or 2970 Hz) earth-loop tests last week?
I noticed that ERP/wallplug-power efficiency of the Norway (Dazey) test at 1280 Hz might extrapolate to about 2E-8 with 1 km between electrodes (with ~ 20 ohm electrode-to-earth resistance); and though it might be informative to compare.
73,
Jim AA5BW
From: [email protected] [mailto:[email protected]] On Behalf Of Markus Vester
Sent: Saturday, September 8, 2018 5:53 PM
To: [email protected]
Subject: Re: LF: Re: 137 kHz WSPR-2 on a 900m long ground loop, this weekend
Hi Stefan,
indeed your signal has been very consistent around 5 uV/m and -8 to -10 dB in the afternoon. At 230 km range, this would indicate a radiated power around 40 mW (EMRP), or 0.4% antenna efficiency. Around nightfall, heavy QSB set in, with occaional minima where the signal fell below the decode threshold but was still ghastly visible in the waterfall with heavy RDF colour aberrations. I suspect that the diplole emits more high angle radiation than a vertical, possibly leading to deeper fading at intermediate ranges.
Best 73,
Markus (DF6NM)
-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Sa, 8. Sept 2018 22:45
Betreff: Re: LF: Re: 137 kHz WSPR-2 on a 900m long ground loop, this weekend
Thanks to the many stations beeing RX-active on LF WSPR tonite.
It is very strange, the SNR reported by the stations below 500 km
distance was very good in daytime but now at night there are not more
stations receiving me, except 2 reports by 2E0ILY.
Also the software just reports JN39 instead of JN39WI.
Maybe some reports are not uploaded or shown on the database, because of
conflicting locators for the same callsign?
I can hardly imagine that nothing comes through at night. Very odd.
Does someone have an explanation what can cause these good results
during the day and such bad results at night?
73, Stefan
PS: My QRG is 137.425 kHz and starts each xx:x0 (each 10 minutes). Maybe
someone can see somethning on the waterfall display?
...
