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" <[email protected]>
To: <[email protected]>
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" <[email protected]>
Sent: Thursday, April 26, 2012 11:27 AM
To: <[email protected]>
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 ...
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