Re: LF: RE: Olivia 8 x 250 / psk31 / MFSK 8 503 CENTER BEACON - RUNNING NOW - 1615 HRS

["mal hamilton" <g3kevmal@talktalk.net>]

You were telling us not so long ago that narrow band signals were preferable 
because of S/N, ie QRS 240 etc
Frequency hopping is not wide band signals but narrow signals hopping around 
the band.
Spread spectrum signals are not user friendly for other users in a 
restricted band.
You are also getting confused between LF/MF and V/UHF applications.
Make your mind up OM
G3KEV


----- Original Message ----- 
From: "Andy Talbot" <andy.g4jnt@googlemail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, January 03, 2009 6:38 PM
Subject: Re: LF: RE: Olivia 8 x 250 / psk31 / MFSK 8 503 CENTER BEACON - 
RUNNING NOW - 1615 HRS

But have you thought about the power DENSITY.   Its a well known fact
that spreading a signal in frequency improves channel usage and
assists weak signalling - go back to Shannon's eqn.

Look at first GSM (which used frequency hopping to improve usage) then
3G with DSSS.   Also all the WLAN modes use frequency spreading.

Methinks you're behind the times thinking single carrier modulation.
Amateurs should move with teh times, not be stuck in the 1960's

Andy  G4JNT
www.g4jnt.com



2009/1/3 mal hamilton <g3kevmal@talktalk.net>:
> Tonight another episode of transmissions taking up about 1 khz of spectrum
> in a 3 khz allocation.
> I think the time has come to ask OFCOM for their opinion. These are not
> experimental transmissions,  just established modes generating QRM to the
> rest of the 500 khz community and QRM GENERATORS, and not suitable for 500
> khz.
> The 500 khz band will SEFL DESTRUCT with this type of anti social 
> behaviour.
> I would not blame OFCOM if they pulled the plug.
> and they do read these messages along with the RSGB coordinator.
> G3KEV
>
> ----- Original Message ----- From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Saturday, January 03, 2009 4:49 PM
> Subject: Re: LF: RE: Olivia 8 x 250 / psk31 / MFSK 8 503 CENTER BEACON -
> RUNNING NOW - 1615 HRS
>
>
> Ok Gary,
>
> Thats the first odd report hihi ...psk was not supposed to be better 
> .......
> ! doesn't look well for decodes at range .. i will try and add a few more
> watts ..
>
> are you running  x 3 multipsk at once ? the beacon text is :-
>
> CQ CQ CQ DE...g0nbd  g0nbd  g0nbd
> CQ CQ CQ DE...g0nbd  g0nbd  g0nbd
> CQ CQ CQ DE...g0nbg  g0nbd  g0nbd  kkk
>
> Tnx - G ..
>
>
>
> --------------------------------------------------
> From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
> Sent: Saturday, January 03, 2009 4:37 PM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: LF: RE: Olivia  8 x 250 / psk31 / MFSK 8  503 CENTER BEACON -
> RUNNING NOW - 1615 HRS
>
> > Graham, LF,
> >
> > OK all copied here at varying percentages.
> >
> > MFSK8
> >
> > CQ CQ CQ DE...g0nbd  g0nbd  g0nbd
> > CQ CQ CQ DE...g0nbd  g0nbd  g0nbd  kkk ea dKt  tp r¢iúiik1kE Keonoe
> > x'!etiwB Faøoit"0iüTelt !cgneÊW¥ Dr gf ! la(  i:a ¾dõie.Yp  a.t¢ P
> > ntiae yt
> > rl k ¢gt s CDdo   bd
> > CQ CQ V) DE...g0abd   8(c)x  ag0nbd
> > CQ CQ CQ ..±tßnbd  g0n!d  g0nbw kkk Ä& Äjt  öÎ  E.xg0nbd  g0nbd  g0nbd
> > CQ CQ Jd  t E...g0nbd  yz0nbd   C(c)oLQ CQ DE.n ki±ngS §/  g0P%iKhk er 
> > xu5ui
> > i¹a tyfbhttaq=  ihÄiod  elmha n n E¡tdi¢nbeeue NtotmâeNRxeca
> >
> > PSK31
> >
> > CQ CQ CQ DE...g0nbd  g0nbd  g0nbd
> > CQ CQ CQ DE...g0nbd  g0nbd  g0nbd
> > CQ CQ CQ DE...g0nbg  g0nbd  g0nbd  kkk
> >
> > Olivia 8 x 250
> >
> > CQ CQ CQ DE...g0nbd  g0nbj<"g0nbd  kkk z34QU
> > @DK   CQ CQ CQ DE...g0nbd  g0nbd  g0nbd
> > CQ CQXs[ DE...g0nbd  g0nbd  g0nbd
> > CQ CQ CQ DE...g0nbd  g0nbd  g0nbd  kkk Q cY9L,'6   CQ CQ CQ DE...g0nbd
> > g0nbd  g0nbd
> > CQ CQ CQ DE...g0nbd  0}^)  g0nbd
> > CQ C1@#Q DE...g0nbd  g0nbd  g0nbd  kkk H1R7Y
> >
> > 73
> >
> > Gary - G4WGT.
> >
> >
> >
> >
> > -----Original Message-----
> > From: owner-rsgb_lf_group@blacksheep.org
> > [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Graham
> > Sent: 03 January 2009 16:25
> > To: rsgb_lf_group@blacksheep.org
> > Subject: LF: Olivia 8 x 250 / psk31 / MFSK 8 503 CENTER BEACON - RUNNING
> > NOW
> > - 1615 HRS
> >
> > Follow on from last night , As the olivia system transmits tones in
> > parallel
> >
> > it requires a linear system,   however , MFSK is a single tone phase
> > continuous  system , I am using   three applications of  multipsk running
> > on
> >
> > the same pc in beacon mode
> >
> > 8 tones are selected on the two modes  psk31 is added as a reference
> > signal
> > and is not expected to  print as reliably
> >
> > All  3 modes are the same peak power level , set at the agc threshold ..
> > about 10 watts per system at the moment . there may be a small change in
> > level as each mode starts and stops , the differing beacon lengths' are
> > resulting in the tx windows slowly shuffling.
> >
> > Note , the station is in continuous  TX due to  vox audio  drive levels
> > producing alc preventing the power levels to  be normalised
> >
> > Running  3 mode beacon
> >
> > Dial set   502 khz usb
> >
> > 1000 hz  center   olivia  8 x 250 hz
> >
> > 1250 hz   psk31
> >
> > 1500 hz  MFSK  8
> >
> > Reports  welcome
> >
> > Graham
> >
> > G0NBD
> >
> > Io83LK
>
>
> > No virus found in this incoming message.
> > Checked by AVG - http://www.avg.com
> > Version: 8.0.176 / Virus Database: 270.10.2/1872 - Release Date: 1/2/2009
> > 13:10
>
>
>
> --------------------------------------------------------------------------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.10.2/1872 - Release Date: 1/2/2009
> 1:10 PM


--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.176 / Virus Database: 270.10.2/1872 - Release Date: 1/2/2009 
1:10 PM