Topband: Remote receiver deafness. Was: New Modes, Systems, etc

[W0MU Mike Fatchett]

When I had my skimmer going, I would use my R8 on 80 and 160.  I was 
shocked at some of the DX it spotted on 160 and 80.

On 1/11/2020 6:04 PM, Michael Walker wrote:
> On and off I have had a Web SDR available to some.
>
> To back up with Vince is saying, it is often on a 'left over antenna', or
> mh HF6V.  Good enough for 40 and up and certainly not good enough for 80 or
> 160M.
>
> This is what you are seeing with these.
>
> Mike va3mw
>
>
> On Sat, Jan 11, 2020 at 7:56 PM DXer <hfdxmonitor at gmail.com> wrote:
>
>> I had private correspondence about this, so here is additional information.
>>
>> Some of these remote receivers do have 'bad' antennas, others not so.
>> For 'local' reception, one does not need much.
>>
>> I have an AirSpy HF+ SDR with a 'bad' Mini-Whip antenna in the backyard,
>> at only 4 meters above the ground. It's performance is good enough to
>> receive LW broadcasting stations from Europe, and North Africa. But they
>> use MegaWatts, you say? Fair enough, but it's around 200 kHz.
>>
>> Enough MW stations in North America, located from 500-1000 km from my
>> place. But they use KiloWatts, you say? Not all of them, lots of so
>> called graveyard stations run much less than 1 kW, and the MW band is
>> from 520 to 1,720 kHz.
>>
>> Navtex on 518 kHz, using around 1 kW of power. Finally, NDBs. These can
>> use as little as 25 Watts from 120 to 300 kHz.
>>
>> These remote receivers are a problem for the integrity of the hobby,
>> regardless of the antenna used.
>>
>> Funny enough, they are not 'automatically' good for cheating with FT8,
>> due to latency issues, unless the SDR is a Perseus, but most aren't.
>> They are usually Kiwi, AirSpy, RTL-SDR.
>>
>> 73 de Vince, VA3VF
>>
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