Topband: Hi Z amplifiers for 160m

[Grant Saviers]

More power to make up for my 10db excess noise = xxx Kw - whoopee!  Need 
to get some 3 phase.

Remote Rx, eg 100km makes a lot more sense.  Clubs could put up shared 
facilities.

With direct sampling synchronous receivers and down sampling of say the 
bottom 50Khz of 160, every user could reconstruct their own pattern out 
of a 4 or 8 square.  Residential internet bandwidth is commonly several 
hundred Mbit/sec. The supercomputer on every desk is up to the 
arithmetic. If you live in the boonies without 200Mbit you don't need 
the remote Rx anyway.

Just a small matter of software  ;) ;)  Haven't the radio telescope guys 
done this in GHz bands?

Grant KZ1W

On 3/13/2020 09:42, Jim Thomson wrote:
> Date: Thu, 12 Mar 2020 20:25:16 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: topband at contesting.com
> Subject: Re: Topband: Hi Z amplifiers for 160m
> 
> <Didn't review your math, but the more important question is, "how old is
> <your noise data?"  In my experience trying to work EU on Topband now as
> <compared to c.a. 2007-8 is vastly more difficult thanks to higher noise
> <levels on both ends. Back then I could work EU on CW; now, with better
> <antennas, I need the 10 dB advantage of FT8. In the past six seasons
> <I've heard six EU/U.K. stations on CW, two were able to hear me. And
> <those were all during one of this season's contest.
> 
> <Bottom line -- if your noise data is ten years old, I'd add 10 dB to it;
> <if it's older, probably more.
> 
> <73, Jim K9YC
> 
> ##  Clearly  whats  required  is a long  overdue  increase  in TX  power  limits  on  160  band...and  also  80+40.
> That  or  arrl legal  remote  RXs.....  pick  one.
> 
> Jim     VE7RF
> 
>   
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