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LF: Re: Re: Testing upgraded 500KHz system -- reports tks

from [Mark] [Permanent Link][Original]
To: <[email protected]>
Subject: LF: Re: Re: Testing upgraded 500KHz system -- reports tks
From: "Mark" <[email protected]>
Date: Thu, 10 Apr 2008 22:43:48 +0100
References: <51615_9A0TCP@hamradio><[email protected]><[email protected]> <[email protected]> <01cf01c89a7b$d11d9190$6401a8c0@p4> <[email protected]> <020b01c89a92$4ebef7e0$6401a8c0@p4> <021801c89a96$b8459940$6401a8c0@p4> <[email protected]> <000201c89add$5c787ff0$6401a8c0@p4> <8D27CB0854BA4CF190B64B640BB1311D@Amilo3205>
Reply-to: [email protected]
Sender: [email protected]
Hi Markus and group.
The source I have been using recently is xtal controlled, and whilst not temperature controlled, should not vary much.
The frequency as measured tonight, using a GPS locked frequency standard, is 502.2268 KHz, drifting slowly LF as it warms up.
in the time taken to write this it has gone to 502.2263.
The Xtal oscillator only runs (at 8MHz )on TX.
when needed I have a DDS based synth that gives me full coverage of the band.
For now I am testing on the frequency above ore thereabouts, and will be running on and off this evening.
Regards
mark GM4ISM
 
----- Original Message -----
Sent: Thursday, April 10, 2008 9:52 PM
Subject: LF: Re: Testing upgraded 500KHz system -- reports tks

Hi Mark,
 
yes, you are producing a nice signal into Nuernberg. What seems a little odd is that both Nicolas and Roman show it on 502.200 kHz, whereas my reading would be more like 502.225. Give or take a pixel on the ruler, but my cal shouldn't be that far off...
 
Reading about wind, moisture and antenna voltage effects sounds very familiar - my 200 pF on 137 k is definitely a fair-weather-only type ;-)
 
Best wishes
Markus, DF6NM
 
 
----- Original Message -----
From: "Mark" <[email protected]>
Sent: Thursday, April 10, 2008 9:34 AM
Subject: Re: LF: Testing upgraded 500KHz system -- reports tks

> Roman, Nicolas
> Thanks for the reports guys    Sure was weak Roman, hope stronger on the
> other antenna, but does look like it may have been me.
> a little more work to interface the PC, then I can have the system in beacon
> mode more easily.
>
> 10dB more power sure does get things warmer. I have killed several FETS, had
> mica caps sweating wax, toroids getting so hot you can smell them and
> insulators on the antenna complaining. The plus side is that I can now
> strike a flourescent tube by putting it within a few cm of the antenna, and
> it keeps going like a light sabre a little away from the antenna.  Oh and
> the signal seems to get a bit further :<)
> All good fun
> Regards
> Mark GM4ISM IO85AR
> www.dc2light.co.uk
>
>
>

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