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LF: Re: Transatlantic beacon tests

To: [email protected]
Subject: LF: Re: Transatlantic beacon tests
From: "Larry Kayser" <[email protected]>
Date: Wed, 26 Apr 2000 09:51:04 -0400
Reply-to: [email protected]
Sender: <[email protected]>
Gentlemen:

Transatlantic test beacons need to be very stable so that the listeners
over there that have the equipment can use very narrow bandwidths.
Spectran may be popular but it will only go down to 0.03 Hz and other
listeners over there do have other DSP equipment that can do a lot
better.

The notion of excellent transmitter frequency stability is critical, but so
also is the necessity of having fully automated receiving systems to take
advantage of the fully automated transmitting systems!

I offer that the only long term fully automated receiving software system
available today is that of VE2IQ, Bill de Carle, who has made his C - BPSK
system work over long distances using the GRAB feature.  From my perspective
a season long experiment will require just as much automation and detail
work in the receiver as it will for the transmitter.  What is needed is a
suitable very narrow bandwidth receiver design to go with the DDS effort we
are making over here with the AD9835 DDS device.

I am also prepared to share in the Transmitter effort with alternate nights
from this side with a 240 ft high tower with a partial umbrella antenna on
it.  My Sulzer Labs standard at the transmitter will easily keep 2 parts in
10 -10th.  A reliable large final amplifier is critical to this effort, one
that does not need any baby sitting and can be left running for weeks on end
in a dark, cool transmitter building.

Larry
VA3LK




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