Paul
61 material has the best Q of any of the ferrite materials (that I'm aware of) at LF/MF. Can't say
whether or not the change to a different coil would be appropriate in that circuit.
Jay W1VD WD2XNS WE2XGR/2
----- Original Message -----
From: "N1BUG" <[email protected]>
To: <[email protected]>
Sent: Thursday, October 26, 2017 6:23 AM
Subject: Re: LF: Monitoring 2190m WSPR
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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