I can receive the 11.90476 KHz alpha station (when it is up) with an acceptable
S/N even indoor, using a modest 2-feet, 40-turns square untuned loop and an
easy-to-build pre-amplifier built around LT1028A.
If it is of some interest, I can try to retrieve some screenshots showing the
alpha signal in comparison with some MSK stations between 18KHz and 22KHz.
Cheers
D.
________________________________
Da: [email protected] per conto di Jacek Lipkowski
Inviato: mer 19/05/2010 21.11
A: rsgb
Oggetto: Re: LF: Alpha dashes
On Wed, 19 May 2010, mal hamilton wrote:
> In plain english who can receive the alpha dashes and at what strength
> around EU.
unfortunately they are down now, so i can't tell you what is the s/n now.
but it's hard not to receive these stations. with an e-field antenna (or
with a h-field antenna but at some distance from powerlines) you can hear
them without any downconversion, provided that your headphones (and ears
:) have high enough frequency cutoff. with downconversion to 800Hz i would
give it 599 if it were cw (actually they sometimes transmit a marker in
cw)
a much better test of antennas would be if people can receive SAQ with the
key up (when it is not transmitting) - i don't know what the output power
is, but lower than ALFA, probably a few kW.
jacek
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