[TenTec] RF Speech Processor "TX IMD"

[Bob McGraw - K4TAX]

A technically clean radio meeting today's technical standards and one that 
is adjusted and operated correctly and it being used in front of an amp, 
again one that is clean and adjusted properly is absolutely no problem. 
There are some import amps on the market that are largely "garbage 
generators"  spectrum wise.

My measurements of my radio of the 3rd, 5th and 9th order signals and then 
feeding same to my amp, I find that the 3rd, 5th and 9th order signals are 
the same value or less in dB below the fundamental output.  I've conducted 
two tone tests with both the stand-a-lone radio and then the same with the 
amplifier with no issues of concern or any values not consistent with 
current technical standards.

Now the key to all of this is very careful operation and adjustment of the 
radio and the amp.  Will it get "dirty"?  Sure, just don't tune and load the 
amp correctly or overdrive the amp and it gets nasty quick.

I've personally experience some operators that truly do not know how to 
correctly tune and load a grounded grid linear amp.  This is specially true 
where an operator desires to operate an amp notably below its rated power. 
They typically tune or actually de-tune the amp to attain the power they 
desired.  This is wrong on all counts.  Correctly, tune the amp for maximum 
output while not exceeding the manufactures maximum ratings.   Reduce the 
drive to attain the desired power.  Do not re-tune the amp for lower power 
values.  After all it is supposed  to operate LINEAR.  For an amp that has 
10 dB of gain, 1 watt in will produce 10 watts out, for 10 watts in one 
should see 100 watts out, and for 100 watts in one should have 1000 watts. 
If this does not happen, the amp is not linear.


73
Bob, K4TAX



----- Original Message ----- 
From: "R. Eric Sluder" <resluder at yahoo.com>
To: <wb5jnc at centurytel.net>; <tentec at contesting.com>; <Rick at DJ0IP.de>
Sent: Sunday, June 16, 2013 4:01 PM
Subject: Re: [TenTec] RF Speech Processor "TX IMD"


Rick,

You may have saved me a lot of money. I'm close to purchasing an amp, and I 
read your note below about "but if you hang an amp..." and I don't need a 
bunch of angry neighbors. :)

Eric
W9WLW

Sent from Yahoo! Mail on Android

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