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' [email protected] [rsgb_lf_group]
> <[email protected]> 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 [email protected] [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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> 01/19/17
>
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