[pskmail] Re: FW: PSKMail operation
- From: Rolf DL0IMA <dl0ima@xxxxxxxxxxxxxx>
- To: Rein Couperus <rein@xxxxxxxxxxxx>
- Date: Tue, 21 Oct 2008 22:26:56 +0200
Hi Rein wir haben alles zurückgenommen,
Mikgain usw, ich denke es müsste jetzt gut sein. Beobachte mal.
73 Rolf
Rein Couperus schrieb:
Here is a mail from Peter Martinez, G3PLX.
The frequencies mentioned are all from DK4XI, pse adjust your transmitters
so that no sidebands are generated!! (Roberto, your sig on 10148.0 also has
too much audio on the sync preamble). Please check your signal on
a waterfall.
The last thing we want to do is generate qrm to other stations!
73,
Rein PA0R
-----Ursprüngliche Nachricht-----
Von: "Peter Martinez" <peter.martinez@xxxxxxxxxxxxxx>
Gesendet: 21.10.08 16:45:45
An: <Rein@xxxxxxxxxxxx>
Betreff: PSKMail operation
Rein:
I am hearing a number of transmissions, on 7038, 10147, and 14078,
transmitting 250 baud PSK. All these signals are heavily over-driven and
emitting lots of extra sidebands. At first I feared that someone had been
sending out PSK software with no envelope filtering on the transmit signal,
but after asking around, I understand that these signals are coming from
PSKMAIL stations, which are using your software, and the modulation is
implemented by fldigi, and this DOES filter the transmit signal properly.
So it ooks like the PSKMAIL operators have not set up the drive levels
correctly, and are splattering badly. I have tried to identify the signals,
but they do not appear to be including their own callsigns in the
transmissions. By watching the logs on the www.pskmail.de website, I can
begin to guess that maybe DK4XI and PI4TUE may be responsible, but I cannot
be sure.
Could you please contact the PSKMAIL operators and try to get them to check
their transmitter set-ups, and correct the overdrive. This will greatly
reduce the QRM that these signals must be causing, especially on the crowded
7MHz band.
I attach a spectrum waterfall which shows the kind of thing I mean.
By the way, can you answer a question: What are these stations actually
doing? I can see no useful information being transmitted and no mail being
passed!
73
Peter G3PLX
(The originator of the PSK31 mode)
--
Rolf Behnke DL0IMA DK4XI INTERMAR e.V
dl0ima@xxxxxxxxxxxxxx
www.intermar-ev.de www.eu-mmsn.org www.positionsreport.de
www.pskmail.de www.pskmail.eu
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