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LF: LF coil winding

To: [email protected]
Subject: LF: LF coil winding
From: DK7FC <[email protected]>
Date: Sun, 13 Sep 2015 23:07:15 +0200
In-reply-to: <[email protected]>
References: <[email protected]om>, <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
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Hi Gary,

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...
73, Stefan

Am 13.09.2015 20:11, schrieb Gary - G4WGT:
Hi Stefan,

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 WSPR15
Hi Jay,

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
interesting :-)
73, Stefan

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 ;~) .

----- Original Message ----- From: "DK7FC" <[email protected]>
To: <[email protected]>
Sent: Sunday, September 13, 2015 9:16 AM
Subject: Re: LF: R7NT WSPR15

Hi LF,

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 then again.

73, Stefan

Am 13.09.2015 15:02, schrieb Mike Dennison:
Alex was also a good signal with me when he sent Opera 32 last night.

Mike, G3XDV

Hi Alex,

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

73 Joe

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