[ARC5] "Curing Chirp in Command Transmitters"

[don davis]

Yes, the RF would be modulated at 60 Hz.  Seems to me that it would not be
very noticeable in operation (would have sidebands which maybe or not be
filtered out) once the oscillator fired and stabilized.  The key with ALL
oscillators is to have enough energy available at t=0 to get the desired
waveform in  the required time.  The oscillator's available energy will be
reduced in making the extra 60 Hz sidebands and should take longer to
stabilize - which is observed as a chirp?  The worst case scenario is that
there is so much 60 Hz energy to overcome that the oscillator could operate
(very poorly) stabilized with 60 Hz bursts of RF.  I'd love to fire one up
and verify all of this, but no access to my test benches / test equipment.  

Random thought:  25 WPM requires about 100 Hz so a properly designed xmtr
should do this ok.   With bad chirp it may not be able to do 15 WPM - might
be an easy test to see what the fastest copyable speed is?

73 de don ad6pb

-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of WA5CAB--- via
ARC5
Sent: Sunday, October 05, 2014 10:53 PM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] "Curing Chirp in Command Transmitters"

Glen,

I'm sorry, but your statement isn't technically correct.  Someone yesterday
or the day before (I'm sorry but I didn't pay any attention to who posted
it) already explained this.  Go back and read it. Plus the cathode bias on
the 1629 will be screwed up and modulated at 60 CPS.