[Lowfer] WSPR Weak Sig vs. QRP

[Eric NO3M]

Pat, et.al.

No argument, just pointing out a possible premise for HP beaconing.

However, I do think issues like this deserve attention and open 
discussion on mitigation techniques, equipment specs, and/or operating 
practices.  If/when the band opens to general amateur use, the 20W+ ERP 
station 1000 mi away is going to be the 1-5W ERP station 100 mi away for 
many stations.  Even at sub-1W ERP, my signal swamps Fred's (KN8AZN) 
grabber; he's about 30 mi away.  This can definitely be an issue when 
the focus is on weak signal reception.

Another part of the issue may be the ability of receiver's being used, 
blocking dynamic range, etc.  If the receiver isn't good enough to hold 
up to say a 160M contest, with numerous close-spaced strong stations 
packed together, while still being able to copy weak DX between them, 
then it may not hold water on a very narrow band w/ a strong local QRP 
station.  Another issue that has come up periodically is IMD caused by a 
strong in-band signal, often resulting in multiple decodes in WSPR by 
receiving stations.  (other times TX equipment's fault!  My SDR TX 
decided to start keying the WSPR signal the other night, and with fast 
rise/fall, started generated sidebands)

With only Part 5 transmissions taking place at this time, and being 
relatively spread out, I suspect it will be a real dose of reality when 
the band is allocated to amateur use and more local stations start 
popping up.

73 - Eric NO3M, WG2XJM

On 2/3/2013 17:40, pbunn at patbunn.com wrote:
> Don't really want to start an argument. I can sometimes be decoding 
> 4-5 signals that are running a watt or so ERP and from distances of 
> approximately 1000 KM or more. Then the 20-30  watt ERP station comes 
> in and nothing decodes again.  I am 1000KM away and he is 20 over 9 on 
> my R75 running WSPR.
>
> I have plenty of other thing to do on the band  - so I go do them. 
> When that station is in the window  - at my location decodes don't 
> happen.
>
> Pat
>