Might get away with less than 100 w ?
G..
19:58 136 G8IMR de G4WGT Op8 314 km -18 dB in Coppull, nr Preston
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From: "Andy Talbot" <andy.g4jnt@gmail.com>
Sent: Tuesday, January 10, 2012 8:04 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: opera 137 beacon going
600 Watt of Rf to 7m high Tee with Gnd loss about 80 ohms. I reckon
about -40dBi gain so call it a few tens of mW
Andy
On 10 January 2012 19:58, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote:
Reaching Gary with +7 dB in hand , what is the carrier power ?
Be very interesting to see what the s/n would be from MAL
over similar range and similar path , with all that wire out
should be able to catch Andy's beacon into the +dB scale
G..
18:49 136 G8IMR de G4WGT Op8 314 km -19 dB in Coppull, nr Preston
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From: "Andy Talbot" <andy.g4jnt@gmail.com>
Sent: Tuesday, January 10, 2012 4:06 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: opera 137 beacon going
Having had to modify a 137kHz source to be able to generate on-off
keying, I'm transmitting a signal using 2.048s symbol mode on 137420Hz
33% duty cycle (for now)
This is based around my PIC generator for the mode
Details at http://www.g4jnt.com/PIC_Opera_Source.pdf and
http://www.g4jnt.com/OperaBeacon.zip
As its an independent source, with no PC in the Tx chain - no IP
packets will be sent to t'web showing the details
and its definitely gettign out....
15:46 136 G8IMR de F6CNI Op8 391 km -28 dB in 136 kHz dial nr Paris
Andy
G4JNT
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