K3: re CW ID macro on SSB

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K3: re CW ID macro on SSB

Edward R Cole
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?
DUBUS Magazine USA Rep [hidden email]
======================================
*temp not in service
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Re: K3: re CW ID macro on SSB

Cookie
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 <[hidden email]>
To: [hidden email]
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?
DUBUS Magazine USA Rep [hidden email]
======================================
*temp not in service
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html



     
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html