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LF: RE: VLF mods

To: <[email protected]>
Subject: LF: RE: VLF mods
From: "hvanesce" <[email protected]>
Date: Thu, 19 Dec 2013 16:10:15 -0700
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Nice clean layout.

Are those polypropylene film capacitors on the printed circuit board? If so,
great choice; best ESR at high voltage at 10kHz.

73,  Jim AA5BW  

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Stefan Schäfer
Sent: Thursday, December 19, 2013 2:34 PM
To: [email protected]
Subject: LF: VLF mods


Here i spent some time to modify the VLF PA used during the field
experiments. The old version was on a wooden plate (known from the photos in
a few amateur radio magazines and images at Now it even has an EMI
filter!! :-) and a switch and fuses and a grounded box which is better due
to safety aspects (other people could touch it when the plug is in and i'm
not watching). Maybe i can replace the fiber optic cable by a simple
optocoupler and isolated BNC jack.
So far for today:

73, Stefan/DK7FC

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