LF: Re: LF: RE: Alignment of (Narrow Band) DATA and WSPR frequency’s on the 500 KHz band.

[M0FMT <m0fmt@yahoo.co.uk>]

Band plans are a bad idea all it does is great unofficial RSGB Policemen that make life a pain like they have done on VHF here in the UK......... Any way the band is only on loan.
 

73 es GL petefmt

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From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Cc: Joe Taylor <joe@Princeton.EDU>
Sent: Tue, 15 February, 2011 7:23:06
Subject: LF: RE: Alignment of (Narrow Band) DATA and WSPR frequency’s on the 500 KHz band.

Hello Graham,

 

I would suggest to have all digital modes as close as possible to the band edges, leaving the band centre for CW.

For WSPR there are currently 2 segments: one for EU stations to transmit on (503.9kHz +/- 100Hz) and one NA stations to transmit on (501.1kHz +/- 100Hz) to avoid local QRM (or better said RX overload).

So 503.7kHz +/- 100Hz and/or 501.3kHz +/- 100Hz for other digimodes ?

It would be possible to have a single data segment for EU and NA it we go from frequency division to time division: if all EU stations would transmit in the xx:00-xx:02, xx:04-xx:06, xx:08-xx:10 ... time slots and all NA stations in the xx:02-xx:04, xx:06-xx-08 ... time slots they can use the same frequency without local QRM.

But this would require a minor chang in the WSPR software (and maybe also other software).

 

73, Rik  ON7YD - OR7T

 

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Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Graham [g8fzk@g8fzk.fsnet.co.uk]
Verzonden: dinsdag 15 februari 2011 2:20
Aan: rsgb_lf_group@blacksheep.org
CC: Joe Taylor
Onderwerp: LF: Alignment of (Narrow Band) DATA and WSPR frequency’s on the 500 KHz band.

Alignment of  (Narrow Band) DATA  and  WSPR  frequency’s on the  500 KHz  band.

 

The  original wspr frequency   502.4  was  defined  as the  working  frequency  to  utilise the  ‘clean’ area  just under the  504  harmonic, whilst avoiding the  various  beacons  running  across  the  501/504  band at the  time. However, time has moved on and there are now numerous ‘dial setting’s’ in use both sides of the Atlantic.

 

Due to  an apparent  increase  in the  side band  noise  from the  504 signal , possibly by  enhanced  propagation , the  ROS  MF  (100 hz b/w) working  frequency is  to be re defined as  500  USB dial  set  giving a  centre  carrier  frequency of 501.500  

 

Due  to  Ae  bandwidth and  perhaps  alignment  with   other   band’s,  I   would  suggest the original WSPR  502.4K is  replaced  with the  lower frequency  of  495.9K , thus  restoring the  System’s  coverage and  facilitating  changes  of mode etc within a  narrow bandwidth.

 

I don’t  see  this  detracting  from the monitoring  of spot  frequency  beacons  over 505Khz , but more  appropriate   to  transmitting  stations , which  by the  nature of the  antenna arrays are  not  able  comfortably  to  qsy  from  top  to  bottom of the  band without  re-tuning, not  always a  simple  option.

 

Comments  or  suggestions please ?.

 

Graham

G0NBD