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Message-ID: <002801c70e93$776f1b20$0300a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <001701c70e90$de626ba0$6801a8c0@Radio>
Date: Thu, 23 Nov 2006 00:08:09 -0000
MIME-Version: 1.0
Subject: LF: Re: VY1JA beacon protocol changes.
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Status: O

Hi J, that sounds like a good idea. The only comment I would make after a
lot of listening for weak stations is that all the other "possibles" like
Loran lines peeping above the noise occasionally are very stable, or like TV
timebases very UNstable. Your signal was spotted because of the small
"switch on drift" it might have been there before but been dismissed as not
important. However the one thing that few signals from other sources do is
shift frequency in a systematic way. this can be DFCW  with a narrow shift
(0.1Hz) at that dot-speed. I have suggested to other beacons that they move
frequency by a small amount (0.1Hz?, but depends on the speed used ) to a
set regime, like every 10 minutes. In Europe this can be particularly useful
when looking for very weak signals above 150kHz  where we have loads of BC
station artifacts. One has to be careful as there is a visual integrating
effect where the receiver can spot a line on the screen, amongst the snow,
only after several minutes. Moving too rapidly or DFCWing too great a shift
can destroy that effect. This shows that super-stable signals are not always
the best :-))

Well Done, you worked hard for that.
Cheers de Alan G3NYK

----- Original Message -----
From: J. Allen <vy1ja@northwestel.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: 22 November 2006 23:49
Subject: LF: VY1JA beacon protocol changes.


> John, Hartmut, Steve, Scott, and "The Gang",
>
> Upon advisement, VY1JA is now beaconing with 3:1 dot ratio, and 60 second
> dot length.  The time is sychronized daily to NIST and, "JA" is sent every
> half-hour, with a , "VY1JA", 6 WPM morse ID following.  The beacon
transmits
> in synchronism every 30 minutes.  Transmissions are still on ~137778.65.
>
> This should make the signal easier to identify and detect and for those
with
> software and capability to receive CW which is only synchronized to the
> computer clock on the half-hour and a computer clock synchronized to NIST
> once per day.
>
> If there is anything which I can do beyond these things to make the signal
> easier to detect, I am not aware of it.
>
> Good luck, (and Hartmut, your card is in the mail box in front of the
> general store waiting for pickup tomorrow.)
>
> 73,
>
> J.
>
>
>