|
No problem but at present all antennas diverted back to
500 and 137
On the Alpha freqs and down to 9 Khz the difference
between antenna OFF/ON is 30 dB atmospheric noise.
Alpha signals always strong with me day or night on
average 25dB over noise, some qsb effects at times.
This qth is in a noise free environment, all electric and
telephone wires underground and antennas some hundred metres in the opposite
direction.
Nearest overhead grid line some several miles
away.
de mal/g3kev
----- Original Message -----
Sent: Friday, January 21, 2011 9:49
PM
Subject: RE: LF: Alpha benchmark
Can we get a say 24 hour plot of Alphas/ signal to noise
for your location Mal please? Id be very interested to see how quiet your
location is.
Cheers
From: [email protected]
To:
[email protected]
Date:
Fri, 21 Jan 2011 19:12:05 +0000
Subject: LF: Alpha benchmark
vlf
As a guide for those interested in VLF 9 Khz it
would be useful if each station could use the Alpha station on 11905 Khz as a
benchmark for quality of reception.
and let us all know hown efficient their RX
system is.
In my case using an inv L 150 metres total length
not resonated the report is minus 60 dB with a sig over noise of 25
dB. This seems an acceptable system for 9 Khz reception.
I can do better by resonating the antenna,
or using my 136 antenna system re-resonated for 9 Khz
I get the impression that at some locations
receiving is a problem, for various reasons including noise from being in the
middle of a Urban environment.
Can we have some data.
de mal/g3kev
| 