Re: LF: info about better digital mode in 2200m band

["PA1SDB, Peter" <pa1sdb@amsat.org>]

Hello Mauro,
Did you take notice about my experiments regarding feeding the antenna with a 
battery ?
Take a look at the pictures around the 25th of March in that log: 
http://www.qsl.net/pa1sdb/Experiences.htm

I tried several power supply's, feeding it external with a power supply, via a L8712, very large C over the + and -, but nothing did 
help to get rid of the noise.
Only when I use a battery to power the PA0RTD Mini Whip, the noise is gone.

I'm writing here the expereince about signals below 24 KHz. I don't know what 
the effect is above 24 KHz.

73's, Peter - PA1SDB

http://www.qsl.net/pa1sdb






----- Original Message ----- 
From: "IK1WVQ Mauro" <ik1wvq@stmb.it>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, April 26, 2012 4:27 PM
Subject: Re: LF: info about better digital mode in 2200m band


> Hi to all,
> thanks a lot for all the answers to my question ...
> I want to precise my position:
> I manage a 10.140MHz QRSS grabber from 2 years.
> This winter I discovered the PA0RDT antenna, initially tried at 10.140 MHz (no 
> great results) and then
> at 500 KHz (few beacon received - DI2AM , OK0EMW , IQ2MI etc.) and finally 137 
> KHz ..
> Now i survey the segment 136.169-136.173 and 137.670-137.740 ..
> the results are online in my website ..
>
> Now in the 136.170 segment i receive ONLY DK7FC , with good signals but with 
> deep QSB  ..
> Now in the 137.700 segment NO ONE received station ...
>
> I think my problem is the noisy urban environment, the 137.700 is more noisy 
> than 136.170 ..
>
> probably the PA0RDT makes intermodulation (a mistake was surely made: in order to increase sensitivity I place a 60 cm "whip" wire 
> other than the PCB antenna), or my cable keeps noise (thanks Mike for this info)..
> I planned to remote the antenna and RX in a rural site with a microwave link to my qth, but for now this is impossible (mains 
> power problems) ..
> the last resort will be a magloop tuned and preamplified  ....
>
> My request for infos about digital mode was simply to try to receive other 
> traffic before my patience runs out .. HI!
>
> From your emails, probably OPERA is the better choice, I shall try ..
> (the RACALL 1792 is stabilized by a GPS .. no problem for frequency stability)
>
> Thanks again for your attention ..
>
> 73 da Mauro IK1WVQ
>
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> At 17.35 26/04/12, Graham wrote:
> > Mauro did  ask  ' the better digital mode ' as "reverse beacon" and listed 3 
> > modes.
> > I think  this  relates to internet linked s/n  reporting  systems , as wspr / 
> > lentus / Opera
> > and other's  that have  web linking and not  simple  recognition ?
> >
> > Now  if  some one  can  slow a  CW skimmer  down  slightly , there is a 
> > opportunity
> > to read qrss as a  reverse CW  beacon  mode and  report s/n  via the  web !
> >
> > G..
> >
> > --------------------------------------------------
> > From: "IK1WVQ Mauro" <ik1wvq@stmb.it>
> > Sent: Thursday, April 26, 2012 11:27 AM
> > To: <rsgb_lf_group@blacksheep.org>
> > Subject: LF: info about better digital mode in 2200m band
> >
> > > Hi,
> > >
> > > what is the better digital mode for starting listening 137 KHz band  as "reverse 
> > > beacon" (no TX)??
> > > ("better" = greater number of active stations in Europe)
> > >
> > > WSPR ?? LENTUS ?? OPERA ??
> > >
> > > what frequency is utilized for those modes ???
> > >
> > > thanks in advance to all ..
> > >
> > > 73 de Mauro IK1WVQ
> > >
> > > P.S.: my RX station is : PA0RDT 8 meters over the roof, RACALL 1792 .. not 
> > > great station at all ..
> > > in QRSS mode the only station what I can receive is the "broadcast (HI!)" 
> > > beacon of Stefan DK7FC .. NO OTHER ...
> >
> >
> > Nessun virus nel messaggio in arrivo.
> > Controllato da AVG - www.avg.com
> > Versione: 9.0.930 / Database dei virus: 2410.1.1/4959 -  Data di rilascio: 
> > 04/25/12 20:34:00