Re: [Amps] IMD

["Carl" <km1h@jeremy.mv.com>]

----- Original Message ----- 
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "Dan Mills" <dmills@exponent.myzen.co.uk>; <amps@contesting.com>
Sent: Monday, January 02, 2012 1:01 PM
Subject: Re: [Amps] IMD


> If the amplifier is extremely non-linear it can produce key clicks.
> Class-E amplifiers requre a enevelope modulating power supply to
> prevent key clicks.
>  I can see that it is possible for hard driven, class-c amplifier with 2 
> or 3 times cutoff bias
> could produce very noticable  key clicks.
> 73
> Bill wa4lav


Absolutely true about Class C and I had to take special care when using a 
boatanchor TX into a big Class C amp on CW. It was as easy as reducing drive 
and watching the tuning on the monitor with any of the vintage TX but I 
finally dropped the bias to roughly Class B in the amps by adding an 
additional relay to the Phone-CW switch.

1500W of deep C CW can aggravate many as I initially discovered  several 
years ago when returning to my old roots! The funny thing tho was they all 
accused me of running an Icom something or other or a Yaesu FT-1000D.

Carl
KM1H


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