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Date: Tue, 10 Jan 2012 22:01:50 +0000
Message-ID: <CAA8k23RQYgDS_OAt8-Sb1sxcGCLY7PULRdz1oHdOUd+mDdqbiw@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: opera 137 beacon going
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No, the only Tx I have for LF these days is the 700 Watt job.   Its
switch mode .
Changing taps may bring it down to 300 watts, but no less.

I'll have a look though the junk-junk box (stuff destined for rallies
/ dismantling  etc)  -  may still have a QRP Tx from years gone by,
probably a 73kHz one that should go at 137

But it would be nice to be copied in the US using the QRO.   Something
I'd never thought likely with this antenna ever before.

Andy
www.g4jnt.com


On 10 January 2012 21:21, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote:
> Opps
>
> Spent =A0so =A0long =A0on op2 =A0, just realises =A0your =A0OP8
> OP8 -32dB Op31 -38 dB S/N Mean (not peak) 21:07 136 G8IMR de G4WGT Op8 31=
4
> km -18 dB in Coppull, nr Preston
>
> That is =A0+20 dB over the =A0s/n =A0limit .. you =A0should =A0be ok =A0d=
own to 600 >>
> 60 >> =A0.... 6 watts
> Can =A0you reduce =A0to =A0that =A0level ?
>
> G..300
>
>
>
>
> --------------------------------------------------
> 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. =A0 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 =A0Gary =A0with =A0 +7 dB =A0in hand , what =A0is the =A0carri=
er =A0power ?
>>>
>>> Be =A0very interesting =A0to see =A0what =A0the s/n =A0would =A0be =A0f=
rom MAL
>>> over similar =A0range =A0and =A0similar =A0path , with =A0all =A0that =
=A0wire out
>>> should =A0be able to =A0catch =A0Andy's =A0beacon into the =A0+dB scale
>>>
>>> G..
>>> 18:49 136 G8IMR de G4WGT Op8 314 km -19 dB in Coppull, nr Preston
>>>
>>> --------------------------------------------------
>>> 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 =A0 http://www.g4jnt.com/PIC_Opera_Source.pdf =A0and
>>>> 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
>>>>
>>>
>>
>