Message-ID: <4B46B3621DCD414786CB3C2223D61BA7@Extensa>
From: "PA1SDB, Peter" <pa1sdb@amsat.org>
To: <rsgb_lf_group@blacksheep.org>
References: <E1SNLw1-000294-FY@post.thorcom.com> <FA5471E148FF4FB4BBC9C959E69625AF@AGB> <E1SNRXA-0004gy-3c@post.thorcom.com>
In-Reply-To: <E1SNRXA-0004gy-3c@post.thorcom.com>
Date: Fri, 27 Apr 2012 08:07:24 -0000
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Subject: Re: LF: info about better digital mode in 2200m band
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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
>
>