[Lowfer] Propagation

Wed, 10 Sep 2003 13:58:53 -0800

Agree with all - I tend to get more destructive interference than additive 
from Sky wave on my Loran signals with my array (Nearedst Loran is about 200 
miles or more away) signals that are oodles of dB over noise, say 30dB in 
the day can fade completely here at some time during the night, but for me 
Loran lines are a god send for rx calibration and a good reality health 
check...Im glad Im not closer though.

Laurence

>From: "John Andrews" <[email protected]>
>Reply-To: [email protected]
>To: <[email protected]>
>Subject: Re: [Lowfer] Propagation
>Date: Wed, 10 Sep 2003 16:18:33 -0400
>
>Lewis,
>
>The loran stations' power is constant 24/7. I think you answered your own
>question, though, by saying that your noise levels are quietest during the
>day. Same here. Some of the Loran lines will disappear in the static 
>crashes
>at night. Same thing holds true for Lowfer signals!
>
>Yes, the propagation at night will have fading, so those lines may come and
>go. On signals that are close enough to be heard in the daytime, you may 
>get
>some high angle ionospheric reflections that add and subtract from the
>surface signal. So a steady daytime signal may definitely fade at night.
>Plus with Loran, you are getting those lines from more than one transmitter
>site, further complicating the issue.
>
>The quieter daytimes come from two things. First, thunderstorms are more
>common in the afternoon and evening hours. Second, a lot of that nighttime
>noise is arriving by skywave, just like the signals you'd prefer to
>see/hear. Daytime skywave propagation at LF is low to non-existent, except
>possibly in the dead of winter.
>
>John A.
>
>
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