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Re: LF: opera 137 beacon going

To: <[email protected]>
Subject: Re: LF: opera 137 beacon going
From: "Graham" <[email protected]>
Date: Tue, 10 Jan 2012 21:21:48 -0000
Importance: Normal
In-reply-to: <CAA8k23QohRM0fbtFAZ0hBhaXdRGQ_fUex7npEmfd4XnjFMSnKg@mail.gmail.com>
References: <CAA8k23Qqo4ZagVGLdEiUqGSU-HL_XNpues+rPAr7NwOhiyd1zQ@mail.gmail.com><3BD3153722394C9E9F82E099417C1957@AGB> <CAA8k23QohRM0fbtFAZ0hBhaXdRGQ_fUex7npEmfd4XnjFMSnKg@mail.gmail.com>
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Opps

Spent so long on op2 , just realises your OP8 OP8 -32dB Op31 -38 dB S/N Mean (not peak) 21:07 136 G8IMR de G4WGT Op8 314 km -18 dB in Coppull, nr Preston

That is +20 dB over the s/n limit .. you should be ok down to 600 >> 60 >> .... 6 watts
Can  you reduce  to  that  level ?

G..



--------------------------------------------------
From: "Andy Talbot" <[email protected]>
Sent: Tuesday, January 10, 2012 8:04 PM
To: <[email protected]>
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 <[email protected]> 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

--------------------------------------------------
From: "Andy Talbot" <[email protected]>
Sent: Tuesday, January 10, 2012 4:06 PM
To: <[email protected]>
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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