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From: <jrusgrove@comcast.net>
To: <rsgb_lf_group@blacksheep.org>
References: <4273a2ab-787c-d909-e7d0-d21db21ba18c@n1bug.com> <59EF0EDB.15093.422D52F1@mike.dennison.ntlworld.com> <59F05705.5020008@posteo.de> <59F1ADF3.16016.4C6AD4F6@mike.dennison.ntlworld.com> <f3fa3220-4199-4cd6-e26d-5a41cb5944e4@n1bug.com>
Date: Thu, 26 Oct 2017 10:46:34 -0400
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Subject: Re: LF: Monitoring 2190m WSPR
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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" <paul@n1bug.com>
To: <rsgb_lf_group@blacksheep.org>
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
>