Thanks for the ideas and links. Of course i thought about double layer
winding when designing the coil on the beginning... I think i cannot
afford windings beeing so close together because of the high voltages.
You can't imagine... ;-) 10 kV is nothing!
I want to try to use some test-tubes as a spacer and just a few double
layer windings on the top of the coil. With 2 cm of distance, it coul
work well i think. First i will remove 3 or 4 turns of the burnt litz
wire. Then i want to try to get the same L with the shorter wire using
that technique which has a better coupling and improved l/d ratio...
Am 13.09.2015 20:11, schrieb Gary - G4WGT:
Try pyramid winding, I am using this on my 136 kHz coil, saves space.
A bit tricky to do though :-
And my coil :-
73, Gary - G4WGT.
-----Original Message----- From: DK7FC Sent: Sunday, September 13,
2015 5:04 PM To: [email protected] Subject: Re: LF: R7NT
I think the guard ring above the upper winding of the coil lost its
contact to this winding. So it was floating. Or, the contact was loose
so there was a small arc that started to burn that ring down so the
structure became more and more inhomogenious, from a E-field view.
Well, at least it worked very well since 2011!
I want to get even better results after the maintenance. There is some
room for improvements: The diameter / length ratio has never been
optimal on that coil. I want to check if it's possible to build a
double layer coil, at least a few of the upper windings... Effort but
Am 13.09.2015 15:35, schrieb [email protected]:
Any idea what started the meltdown?
Heard someone say once: There are two types of LF ops ... those that
have experienced fires ... and those that will ;~) .
Jay W1VD WD2XNS WE2XGR/2
----- Original Message ----- From: "DK7FC" <[email protected]>
To: <[email protected]>
Sent: Sunday, September 13, 2015 9:16 AM
Subject: Re: LF: R7NT WSPR15
Unfortunately my LF coil got damaged during transmitting a few weeks
ago. I'm soon repairing the coil and hope to join the 2200m band
Am 13.09.2015 15:02, schrieb Mike Dennison:
Alex was also a good signal with me when he sent Opera 32 last night.
sorry my WSPR is on strike, no uploads.
Made it now manually.
1745 -35 1.1 0.137603 0 R7NT KN97 53
1800 -32 1.1 0.137603 0 R7NT KN97 53
1815 -35 -0.2 0.137604 0 UT7GH KN66 20
1845 -36 1.5 0.137603 0 R7NT KN97 53
1900 -34 1.5 0.137603 0 R7NT KN97 53
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