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From: "g3ldo" <g3ldo@ukonline.co.uk>
To: rsgb_lf_group@blacksheep.org
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Date: Tue, 25 Feb 2003 21:05:39 -0000
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Subject: LF: Re: Drooping signal
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> > The DDS is moved 0.1Hz per change of  1 deg C. When I noticed the
> frequency
> > downward drift I went down and opened the door of the transmitter shed -
> > hence the reversal of frequency drift.

John Andrews said
>
> And here I was...waiting for an explanation about how the cesium beam lost
> collimation. I do feel the tiniest bit let down. <g>
>
> What you really need is a GPS-controlled shed door opener.

The idea of the GPS-controlled shed door opener seemed attractive but I felt
it might lock me out when I wanted to get in. A different hi-tech approach
was needed.
It came in the form of a small transparent plastic storage box large enough
to contain the DDS, keyer/driver, a 15watt lamp, a thermometer and a fridge
thermostat. This produces a micro climate of around 10 deg C and a nice
stable signal.
While transmitting last night for KL1X, Laurence saw a signal on my
frequency but doppler shift caused by the polar propagation path made the
keying unreadable. What was needed was some frequency variation!
To do this I needed heat, which was provided by XYL Erica's hair drier.
(another hi-tech solution).
When I was challenged as to what I needed a hair drier for in the garden
shed in the early hours of the morning she found the explanation
unconvincing.
One day I will have the DDS in the house shack, with a divide by 10
driver/keyer to get much better stablity and 0.1Hz resolution - but it wont
be as much fun.

Peter G3LDO