testing for LORAN
André Kesteloot
akestelo@bellatlantic.net
Tue, 18 Aug 1998 08:58:51 -0400
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> >From Peter Martinez G3PLX Kendal Cumbria.
>
> The best way to check if it really is LORAN you are hearing,
> is not to use a narrow-band spectrum analyser but to use the
> widest bandwidth possible (without sufferring adjacent channel
> interference), and look at the signal on a scope. It helps if you can
> trigger the scope from an external generator that can run at 13.335
> or 14.857 Hz. Start off with the receiver tuned to 100 kHz and adjust
> the trigger generator until you can make a group of pulses slow
> down to a standstill. If Sylt is your nearest LORAN transmitter, it will
> show a group of 8 pulses if you are triggerring with 14.857 Hz and 9
> pulses (8 then a gap then 1 pulse) with the 13.335Hz. Then switch
> quickly to 136 kHz and see if you still see the same pulse group in
> the same place on the scope. It would be very useful to get some
> measurement of the relative signal levels of the SYlt signal on 100
> and 136 kHz, as this would be an independent cross-check on my
> DSP measurement which showed that all the LORAN transmitters
> are as bad as Lessay.
>
> 73
> Peter
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From: Peter Martinez <Peter.Martinez@btinternet.com>
Subject: LF: Re Loran measured
Date: Tue, 18 Aug 98 07:51:43 +0100 ( + )
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>From Peter Martinez G3PLX Kendal Cumbria.
Interesting that DF3LP is hearing LORAN, possibly from Sylt.
Peter: The best way to check if it really is LORAN you are hearing,
is not to use a narrow-band spectrum analyser but to use the
widest bandwidth possible (without sufferring adjacent channel
interference), and look at the signal on a scope. It helps if you can
trigger the scope from an external generator that can run at 13.335
or 14.857 Hz. Start off with the receiver tuned to 100 kHz and adjust
the trigger generator until you can make a group of pulses slow
down to a standstill. If Sylt is your nearest LORAN transmitter, it will
show a group of 8 pulses if you are triggerring with 14.857 Hz and 9
pulses (8 then a gap then 1 pulse) with the 13.335Hz. Then switch
quickly to 136 kHz and see if you still see the same pulse group in
the same place on the scope. It would be very useful to get some
measurement of the relative signal levels of the SYlt signal on 100
and 136 kHz, as this would be an independent cross-check on my
DSP measurement which showed that all the LORAN transmitters
are as bad as Lessay.
73
Peter
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