[ARC5] "Curing Chirp in Command Transmitters"

[Michael St. Angelo]

Mike,

I agree with you but one has to realize the hobbyist back in 1947 did not
have access to the inexpensive test equipment we had today, especially
oscilloscopes.

Mike N2MS

-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mike Hanz
Sent: Sunday, October 05, 2014 8:36 AM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] "Curing Chirp in Command Transmitters"

Ignore it indeed.  That seems like sage advice.  I always scratch my noggin
when I read solutions like that, since they reveal nothing of the analysis
process that led them to the particular solution presented.  
When faced with a similar chirp problem, KB4DMF did it the right way - put
an oscilloscope on the transmitter to characterize the chirp and started
zeroing in on the cause, which then naturally led to the solution.  I really
don't understand how presumably technical people can agonize over solutions
without a scope to give them a view into the innards of the physics.  It
makes trying fixes so simple.

For more on Steve's particular system and its resolution, see
http://aafradio.org/docs/Relay_timing_issues_-_SCR-274N.html

I hasten to add that he makes no claim that it is the grand solution for
everyone, and documents the boundary conditions for the system and problem.
For me, the main takeaway was the process.  It would have been refreshing if
others back in the day had done the same.

            73,
  - Mike   KC4TOS