This a follow up on the Class AB-D/E/F discussion from a week or so 
ago.   

   I was explaning the equalization of the transmitter and audio path 
delays problem to a friend, who knows the other half of DSP theory 
that I'm unfamiliar with, and either I described the problem poorly, 
or he misunderstood, and he thought that I wanted to replicate the 
transmitter's group delay rather than compensate for it.  Said 
replication is quite simple to implement and is happenstancically 
useful in this instance.  

   An impluse is passed through the transmitter and the resulting 
response is recorded.  The response is directly the coefficients of a 
FIR transversal filter which will replicate the transmitters group 
delay.  This filter may then be inserted in the audio path to the 
power supply.  The transmitter input is delayed with a simple audio 
delay line to match the power supply delay and viola, a matched group 
delay envelope restoration system employing a stock transceiver as the 
exciter.

   I've drawn up a block diagram of the scheme.  If anyone is 
interested, I can send it direct as I can't attach it to a note sent 
through the reflector.

73 & Happy New Year!
   Marv WC6W

http://wc6w.50webs.com/




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