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Re: LF: RE: Ionospheric doppler ?

To: [email protected]
Subject: Re: LF: RE: Ionospheric doppler ?
From: Rik Strobbe <[email protected]>
Date: Tue, 09 Mar 2004 17:11:40 +0100
In-reply-to: <[email protected]>
References: <000c01c405d7$9a522a00$2e2965d5@oemcomputer> <[email protected]> <000c01c405d7$9a522a00$2e2965d5@oemcomputer>
Reply-to: [email protected]
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Alberto,

When I remember it right most "DCF-77 IC's" can be forced to receive mode (pulling a pin to ground or so).

73, Rik  ON7YD


At 16:29 9/03/2004 +0100, you wrote:
Thanks all for your comments.

The clock has an analog part, the receiver, with a very small ferrite
antenna, and a large black wax blob on the PCB, with many traces
reaching it. Usually this is the low cost "packaging" of an IC, which
probably is a sort of simplified microcontroller.

But it turned out that Andy and Johan were right.  I did what I should
have done since the beginning, and what I usually do when building
an oscillator to test its stability : the "blow test".

I blowed for 20 seconds on the exposed components of the clock,
and the result was a change of more than one microsecond....
so the 1pps signal is not derived directly from each pulse of DCF-77,
but from the internal oscillator, corrected every now and then with
the received signal...

I think I can use it as a high sensitivity thermometer, to measure
fractional degree changes in the temperature of my shack  :-)

73  Alberto  I2PHD






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