Hello Jay, LF
As a receive-only participant in this field (I have no possibility to apply for
a permit) I can only guess why some EU stations have chosen to move down along
with the US stations:
One reason may be the recent appearance of a wide band data transmission test
occupying 498-502kHz with a carpet of "white noise". This means the first kHz
of the 501-504kHz band has become less attractive for normal CW EU-EU contacts
and is basically "idle".
Another reason may well be that since the US move down to 501.1kHz there are few
dedicated US station left in receive-only mode on 503.9kHz that could pick up
the EU signals. The everyone-wants-to-be-where-the-party-is syndrome.
WSPR is a "party-line" mode by default, you have to receive where you transmit.
This limitation can be overcome by running two WSPR setups and having the
receiver on a different frequency, or better still, receiving on two
frequencies as I do at the moment.
Perhaps a future WSPR version will have an option of arranging split frequency
operation where the user can specify separate transmit and receive windows?
BR
Paul-Henrik, OH1LSQ
Quoting [email protected]:
> This is nuts!
>
> We finally move the US WSPR stations out of the EU WSPR 502.4 window down to
> a new US WSPR 499.6
> window so that those that want to monitor can have a clear shot at the EU
> stations. Then the EU
> stations move down to the US WSPR 499.6 window!
>
> If EU stations are looking for US spots they would be better off back in the
> 502.4 window. Receiving
> stations in the US are less able to decode EU stations if they are mixed in
> with strong local US
> stations. Some of the US stations are so strong that when they're occupying a
> WSPR time slot the
> receiver/decoder is overloaded and no weak DX spots are possible. With
> several strong US stations on
> the air the problem gets even worse - more time slots are clobbered by the
> locals.
>
> Here's an example from the other night:
>
> 2010-10-31 00:26 G3XIZ 0.503819 -30 0 IO92ub +27 0.501 WE2XGR/2
> FN31is 5420 3368
>
> This was a one shot reception for that night from G3XIZ at signal strength
> -30. Had G3XIZ been
> transmitting in the US WSPR window and several US stations were active it is
> highly unlikely that
> this reception would have occured.
>
> The same goes for T/A QRSS. When EU stations transmit in the US QRSS T/A
> window and US stations are
> active it's just not possible to see EU stations as the local strong signals
> capture the
> receiver/decoder.
>
> Obviously stations are free to do what they like ... but trying to capture
> weak DX spots or QRSS
> screens is going to be far less productive if the receiving station is
> constantly getting clobbered
> by locals.
>
> Jay W1VD WD2XNS WE2XGR/2
>
>
>
>
> ----- Original Message -----
> From: "Paul-Henrik" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, November 03, 2010 5:21 PM
> Subject: Re: LF: 501150
>
>
> Hello Lubos & Jan!
>
> Yes, they are legit amateur stations in WSPR mode looking for stateside
> spots,
> at the moment I receive EI0CF and GM4SLV there.
>
> To receive them, change the default WSPR 600m settings to these:
>
> Dial: 0.499600
> TX: 0.501100
>
> And tune the receiver to 499.60kHz USB
>
> I can clearly see the wideband noise here but WSPR reception is still good.
>
> BR
>
> Paul-Henrik
>
>
> Quoting pa3abk <[email protected]>:
>
> > It's WSPR. Assume "they" shift to the lower end in order to catch up
> > with US stations.
> > Broadbandnoise is rather high at the mom.
> > Jan/pa3abk
> >
> > Op 3-11-2010 21:43, Lubos OK2BVG schreef:
> > > They are three stations in data mode in QSO. Frequeny 501.150kHz. Not
> > > hams, I think.
> > >
> > > Lubos, OK2BVG
> >
> >
> >
>
>
>
>
>
>
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