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

[IK1WVQ Mauro <ik1wvq@stmb.it>]

Hi Peter,
yes, I read your experiences ..
My antenna was already powered by battery ..

I think my problem is noise captured by coax, or noise generated 
locally and then impossible to distinguish from real signals ..
Tomorrow I want to try to isolate coax from RX via a toroid 
transformer ... but I do not believe much ...
thanks for your attention ..

73 de Mauro IK1WVQ

At 10.07 27/04/12, you wrote:
> 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
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > 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
>
>
>
> Nessun virus nel messaggio in arrivo.
> Controllato da AVG - www.avg.com
> Versione: 9.0.930 / Database dei virus: 2410.1.1/4961 -  Data di 
> rilascio: 04/26/12 20:34:00