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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 -----
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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