Jerry Volpe <kg6tt@arrl.net> wrote:
> 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
Not sure about FT1000D, but FT1000MP/MkV actually performs RF clipping,
and it's very cheap, using TA7302P FM IF Amplifier.
Users of "external RF Clippers" must be aware of the fact that the processed RF
is converted back to audio, which is then put through the entire TX chain.
There is a very real danger that artificial RF peaks will be reintroduced,
which will trigger ALC (otherwise PA will be overdriven).
This will reduces clipping gain typically by 3-10 dB.
Please consult the Collins SSB book.
Repeaking effect can be minimized on FT1000MP MkV, Orion, etc
by selecting the widest possible SSB TX bandwidth.
Turning OFF the TX equalization is mandatory!
73,
Sinisa YT1NT, VE3EA
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