Jerry, you are quite right regarding the design. But I do wonder if
everyone knows the difference or if TT is simply selling them as a "better"
processor. If everyone has the right information, most of the time they
will make reasonably good decisions. Had a boss one time that taught me
that anytime you make a mistake, its due to not having all the facts to
consider. The assumption is that with all the facts, reasonable people make
good decisions.
73's
David
Wd9cmd
----- Original Message -----
From: "Jerry Volpe" <kg6tt@arrl.net>
To: <tentec@contesting.com>
Sent: Friday, May 29, 2009 4:31 PM
Subject: [TenTec] Yaesu FT-1000D RF Compressor versus Ten-Tec 715 RF
Clipper... not the same.
Quote:
"Dear Rick,
With all due respect, I'm interested in finding out why you are using
the Ten Tec RF processor with a 1000D when the 1000D has one of the
best RF speech processors ever to be included with a ham rig, built
right into one of the rig's IFs where an RF processor belongs."
There is another issue at work here when comparing the Yaesu design to the
Ten-Tec 717....
A check of the FT-1000D User Manual confirms that Yaesu included an RF
Speech Compressor circuit... whereas the Ten-Tec Model 715 is an RF
Clipper.... not a compressor. There are rather significant differences to
how compressor and clipper circuits work, with clippers being more complex
in design therefore generally more costly.... which is why most
transceivers use either audio compression, audio clipping or RF
compression for speech processing circuits. Then of course all audio
compressors are not alike.... all RF compressors are not alike, etc.
There have been more than a few studies over the years comparing the
maximum possible 'clean(ish)' increase in average voice for a RF
compressor versus a RF clipper circuit. Ten-Tec provides a copy of one of
those studies with each 715 and I believe it can be downloaded from their
website as well. I suggest a good place to begin is to allow each person
to do their own investigation and afterwards make up their own minds as to
what is right for their needs.
73,
Jerry, KG6TT
--
Ralph Jerald "Jerry" Volpe
Amateur Radio Operator KG6TT
ARRL Member & VE
FISTS 12304
788 Chestnut Drive
Fairfield, CA 94533
kg6tt@arrl.net
510 325-7724
707 399-8838 FAX
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