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Fw: LF: Better picture of the 807 based 500kHz TX

from [M0FMT] [Permanent Link][Original]
To: "[email protected]" <[email protected]>
Subject: Fw: LF: Better picture of the 807 based 500kHz TX
From: M0FMT <[email protected]>
Date: Wed, 19 Dec 2012 10:08:31 +0000 (GMT)
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 Try again minus cct too big I think.

73 es GL Pete M0FMT IO91UX
----- Forwarded Message -----
From: M0FMT <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Wednesday, 19 December 2012, 9:52
Subject: Re: LF: Better picture of the 807 based 500kHz TX

Hi Dimitris and group
 
I have not seen the schematic but it is usual to stabilise the screen of a power oscillator to reduce chirp on key down.
Now you have shown us yours I will show you mine. I usually sketch the schamatic after the event so foregive the presentation on the back of an envelope.
I now get at least 4Watts after adjusting the ant link coupling away from the chasis. Best audible DX Kent 80miles best Opera DX PA0 land.
73 es GL Pete M0FMT IO91UX
From: Dimitrios Tsifakis <[email protected]>
To: [email protected]
Sent: Tuesday, 18 December 2012, 23:46
Subject: Re: LF: Better picture of the 807 based 500kHz TX

2012/12/19 Graham <[email protected]>:
> Why the  stabilised  screen  supply ?
> G..

It's embarassing. I like the glow of VR tubes! :-)

73, Dimitris VK1SV



 


Attachment: M0FMT ALL VALVE QRP 500KCS TXa.jpg
Description: JPEG image

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