[Elecraft] K3: re CW ID macro on SSB

[WILLIS COOKE]

Ed, that explanation goes a long way into explaining why NDBs are such a lousy 
navigation aid and the identifiers are sometimes loud and sometimes near 
uncopiable, particularly when not very close to the station.  It is amazing that 
such poor techniques are used for navigation critical equipment!
 Willis 'Cookie' Cooke 
K5EWJ 




________________________________
From: Edward R. Cole <kl7uw at acsalaska.net>
To: Elecraft at mailman.qth.net
Sent: Wed, February 16, 2011 5:49:15 AM
Subject: [Elecraft] K3: re CW ID macro on SSB

As a side note to this topic,  I found it interesting to see how the 
MCW was produced in the LF NDB Aircraft Beacon transmitter that I 
modified to be a linear amp for the 500-KHz ARRL Experimental Program.

It was common for them to have CW that shifted 400-Hz upward in 
frequency, but instead of AM tone modulating a carrier they ran two 
xtal oscillators:  One as set on the carrier frequency and ran 
continuously and a second xtal oscillator set a at f1 = fo +400 Hz 
and was keyed by a CW memory keyer.  This resulted in both "carriers" 
being transmitted by the linear amps as CW modulated USB + 
carrier.  On an AM receiver it produced 400 Hz MCW.

For my use I disabled both xtal osc. and disconnected the CW keyer 
ckt.  I substitute the TEST signal from my K3 for the oscillator 
carrier.  The rest of the transmitter is linear amplifiers.  I can 
drive the 100w 500-KHz xmtr with only 0.1 mw and in any mode that is 
possible on the K3.  However we are restricted to CW, QRSS, psk-31 
and its variants, and WSPR.  Our 15-KHz wide band is not sufficient 
to support SSB and is not allowed.


73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ  500 KHz - 10-GHz  www.kl7uw.com
EME: 144-1.4kw*, 432-100w, 1296-testing*, 3400-winter?
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