[Lowfer] WSPR Weak Sig vs. QRP

[Pat Bunn]

My experience, while limited makes me suspect the software. My R75 has a pretty decent up converter in front of it with a +17dbm mixer and 7 pole filter in front of it and a Norton lossless feedback post amp following a diplexer. The technology is a bit dated but it is a pretty good performer

Pat

Eric NO3M <no3m at no3m.net> wrote:

>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
>>
>
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