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LF: Re:Simple Receivers For 136kHz

To: "RSGB LF_Group" <[email protected]>
Subject: LF: Re:Simple Receivers For 136kHz
From: "Des Kostryca" <[email protected]>
Date: Tue, 16 Nov 1999 22:26:09 -0800
Importance: Normal
Reply-to: [email protected]
Sender: <[email protected]>
Mike Dennison wrote:

However, here's where the trap lies. I could hear >DCF39 at S9+ and
copied MM0ALM (650km) loud and clear. To a >beginner this might
indicate that all was well. But what I could not hear >was the Greek
RTTY which was S7 on the converter, the Loran or >any static.
if you don't get a HUGE signal from DCF39
compared to your noise level, and can't hear the >RTTY just below
136kHz most of the time, and can't hear Loran >and/or static all of the
time, you may need to increase the receiver system >gain.

I most certainly fell in to this trap and actually reduced sensitivity of my
system at one point thinking I would improve dynamic range. Oops!  I have
now corrected my error and have spent the past few weeks improving front end
selectivity and sensitivity with positive results. I can now hear background
noise, static crash etc and the RTTY signal at 136kHz. However, I have so
far not heard Loran but to be honest I don't really know what Loran
interference sounds like. So I wonder if someone could please describe for
me the sound of Loran so I may identify the signal in future.

Many thanks and regards to all on the list.


Des Kostryca (M0AYF)  G.Q.R.P. no. 9788
I.A.R.U.  loc.  IO93OJ  W.A.B.  SK89
Member of the N.B.T.V.A.

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