To: rsgb_lf_group@blacksheep.org
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 <59EF0EDB.15093.422D52F1@mike.dennison.ntlworld.com>
 <59F05705.5020008@posteo.de>
 <59F1ADF3.16016.4C6AD4F6@mike.dennison.ntlworld.com>
From: N1BUG <paul@n1bug.com>
Message-ID: <f3fa3220-4199-4cd6-e26d-5a41cb5944e4@n1bug.com>
Date: Thu, 26 Oct 2017 06:23:31 -0400
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Subject: Re: LF: Monitoring 2190m WSPR
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I wish it were possible to have more WSPR-15 activity on LF. It 
seems like a very promising mode and would be much more interesting 
to me than Op32. Unfortunately for many of us the old WSPR-X 
software needed to decode it is too unstable to run unattended. 
Unless there are MANY requests to the developers that WSPR-15 be 
included in the stable WSJT-X software, I am afraid we have seen the 
death of this sub-mode. If I could have a stable WSPR-15 decoder I 
would definitely monitor that mode alongside WSPR-2.

I'm struggling with my U3S assembly. All went well until I got to 
the coils in the LF and MF low pass filters. Those are giving me 
fits. The supplied wire came with many pre-installed sharp kinks, 
plus I seem to have no skill whatsoever at this "scramble winding" 
to get the required turns on the cores. I'm waiting now for a new 
spool of wire to arrive before I try again. I've thought about 
substituting a different core to allow a single layer winding. A 
FT-37-61 would be lovely with 31 turns on LF. However I fear the Q 
would be too low and losses high. Best to stick with what is proven, 
if I can only learn to wind the devils!

I have the GPS with my U3S and also the OCXO (which I plan to 
assemble later, after getting everything working with the standard 
synthesizer).

73,
Paul N1BUG


On 10/26/2017 05:42 AM, Mike Dennison wrote:
> Yes, WSPR-15 is possible with the U3. I may have to add a fan to the
> PA, though, as I have never run a 15 minute continuous transmission
> at full power before.
> 
> The U3 is an amazing and cheap piece of kit but it will take me some
> time to build - it took me a whole afternoon just to read the
> instructions. I really hate construction (love operating, antennas
> and propagation instead), so it will have to be divided into many
> small tasks while I calm down in between!
> 
> A bonus is that I have bought the GPS unit that goes with it, so I
> will have a source of 1PPS for future EbNaut reception.
> 
> I will announce when the WSPR is working.
> 
> Mike, G3XDV


-- 
Paul
N1BUG  160m-2m         DXCC Honor Roll
WI2XTC 2200m-630m Experimental license
FN55mf      ME      Piscataquis County
http://www.n1bug.com
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