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LF: QRSS

To: [email protected]
Subject: LF: QRSS
From: "Alexander S. Yurkov" <[email protected]>
Date: Tue, 26 Mar 2002 11:47:34 +0000 (GMT)
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Hello, Rik ang LF Group.

On Mon, 25 Mar 2002, Rik Strobbe wrote:

You are in the range of 4000 to 4700 km of most European LF stations. That
might be a bit too much for normal CW. But trans-atlantic tests in the past
years have shown that with a few 100mW ERP it is possible to copy QRSS
signals over a range of 5000 to 6500km. And you have the advantage that you
have a rather northern location, so even this time of the year there a a
good 'dark path'.
I have never think about QSO with Europe because I thought that even in
QRSS mode ERP more then 1 W should be. Your words have change my opinion.
It seems posible for me to radiate 50 or 100 mW.
Regarding the VFO : a drift of no more than few Hz/hour is required for 3
to 10 sec. dotlength, a VXO or PLL is prefered but a good VFO might do it.
My VFO is not very good because it was builded for normal CW operation.
OK. I will be lookin for XTAL for this frequency. There is some oportunity
to get such a XTAL.

I prefer to use PIC16F84 microcontroller as QRSS TX keyer, not PC. To
build such a keyer I should know:

1. What dot duration accurancy should be?
2. What is standard dotlenth and should it be very stable? May be I can
use RC generator in the controller... 3. Should I do any synchronization of each dot/dash start to global time?
If not it's better...

73 de RA9MB/Alex
http://www.qsl.net/ra9mb






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