From: "Mike Dennison" <mike.dennison@ntlworld.com>
To: rsgb_lf_group@yahoogroups.co.uk, rsgb_lf_group@blacksheep.org
Date: Fri, 20 Jan 2017 17:53:12 -0000
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Subject: LF: Re: [rsgb_lf_group] Re: 137kHz WSPR
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Status: O

I will be transmitting Op32 on 137.538kHz overnight, so that might 
add to the fun. My transmission is reasonably coherent so should show 
up on a long duration waterfall.

Mike, G3XDV
===========

>  Hi All.
> 
> I'll be transmitting WSPR tonight (Friday ) from 21.00 to 23.00UTC  on
> 137.520.
> 
> Paul N1BUG has his new RX system running on the band and will be
> listening for EU from his QTH in Maine. John 9H1XT will also be
> monitoring on his  200m long antenna.
> 
> FYI.  I managed to reduce the catching fire issues.  Initially the
> feedthrough flashed over at 200 Watts.   Solved that....Thanks for all
> the suggestions I'm now up to 4.2 Amps of antenna current at which
> point the litz in the matching flashes over. (TPO 600W)
> 
> Still....More coil winding today and it will be nice and reliable for
> this evening.
> 
> If anyone would like to join in please feel free. I'm sure a little
> QRSS just above or below the WSPR segment would be visible on the
> waterfalls. I have to go QRT at 23.00, but that's still early for Paul
> 
> 73
> 
> David
> 
> 
> 
> 
> 
> 
> 
> -----Original Message-----
> From: 'Alan Melia' Alan.Melia@btinternet.com [rsgb_lf_group]
> <rsgb_lf_group@yahoogroups.co.uk> Sent: Sat, 7 Jan 2017 0:28 Subject:
> Re: [rsgb_lf_group] Re: 137kHz WSPR
> 
> 
> 
> 
> 
> 
> 
> Hi David, I think the trouble might be that if you have a sandwich of
> solid "dielectric" and air with a voltage across the sandwich. Then
> the highesr voltage is generated across the lowest dielectric
> contstant gap.....the air. This of course readily ionises and breaks
> down to give a hot spark, which of course burns its way through
> plastics (and paper!) A better material belovedof the old radio
> engineers is glass or ceramic. I used to laugh with Finbar that "you
> haven't really been on LF until you have had a fire" :-)) or as Finbar
> said if you transmit LF and dont have a fire, you are not running
> enough power!
> 
> Alan
> G3NYK
> 
> 
> ----- Original Message ----- 
> 
> From:   David G0MRF g0mrf@aol.com   [rsgb_lf_group] 
> 
> 
> Thanks to the 13 stations who reported my signals on   137k.  (150W
> TPO)
> 
> I had completely forgotten how things catch fire   on LF unless you do
> all the insulation perfectly.
> 
> Had the antenna   passing through a small window with an Aluminium
> frame: Ran the conductor   through a length of hose pipe as
> insulation. - Much smoke from hose Found   old RSGB yearbook from
> 2014. Opened it to about the middle and put in the   antenna. Book
> caught fire.
> 
> Now searching e-bay for a decent diameter of   perspex rod. Or is
> there a better option?
> 
> 73
> 
> David    G0MRF
> 
> 
> 
> 
> 
> 
> 
> 
> -----
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