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
http://www.aurorasentry.com
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