Re: LF: Re: Throb -2- beacon 503.000

["Walter und Marianne Staubach" <wum.staubach@t-online.de>]

Dear Graham,

    at first thanks for the first short description. Found the "packets" on the grabber. What does the abbreviation "Throb" mean and where can one find a description?

73   Walter DJ2LF / DI2AG

 

----- Original Message -----

From: Graham

To: rsgb_lf_group@blacksheep.org

Sent: Tuesday, October 27, 2009 7:54 PM

Subject: Re: LF: Re: Throb -2- beacon 503.000

Ok Walter

 

Well that is a good  question ! ...

 

Its a  narrow  band  data  mode that  uses a combination of   multi  tones and  amplitude modulation .. the  tones relay the  data  and the  amplitude modulation  provides the  syn-pulse .. so  every character   has its ''own sync pulse''  so the  system has no  'lock up or  sync time'' 

 

I am using  FLDIGI  as the  tx software .........  you  need to be very  close on frequency to decode

 

Tnx - G ..

From: Walter und Marianne Staubach

Sent: Tuesday, October 27, 2009 6:34 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: Re: Throb -2- beacon 503.000

Please help, Graham - what is THROB-2?

73

Walter DJ2LF / DI2AG

 

----- Original Message -----

From: Graham

To: rsgb_lf_group@blacksheep.org

Sent: Tuesday, October 27, 2009 6:28 PM

Subject: LF: Throb -2- beacon 503.000

Running  THROB-2-  Beacon   503.000 khz centre  frequency

 

TX set  502.000 USB

Audio  1000 Hz cent frequency

 

Repeat time 60  seconds 

 

RX  'ON'  during cycle tx 'off'  time

 

Reports / observations  

 

Tnx  Graham

 

G0NBD - IO83LK  

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