[TenTec] Yaesu FT-1000D RF Compressor versus Ten-Tec 715 RF Clipper... not the same.

[Walter Hopper]

*I don't usually get involved in Ten Tec debates.... but I must reveal my
findings related to the Ten Tec Model 715.  I must admit, that I was dubious
of the Ten Tec claims that were made concerning its performance.  I fully
expected to send it back after a 30 day trial*
**
*I have been around this sport since 1953 as a military operator, and this
old coot is tight with his wallet.... so I don't make needless
expenditures.  However, bottom line...  It will take a "railroad wrecking
bar" to pry mine off my operating desk.  You guys can say all you want to,
why it is unnecessary, but my findings are: I get a 10 db gain when I kick
in the 715.  Ten Tec is conservative with their specifications.  If you want
witnesses... I can give you those also.*
*I don't even fire up the Titan II anymore.  The Jupiter, along with a
Metron MA1000 500 watt amp, is all I need to bust the toughest pileups.
Incidentally, as a DX'er, I have them all confirmed, and as soon as ARRL
confirms my 7O card, I will have Honor Roll #1  made.  Admittedly, I have
been a Ten Tec fan for many years.... going back to the PM2-B.*
**
*My hat is off to you guys in Sevierville.  We appreciate the American jobs
also. *
**
*Walter Hopper K5VV*



On Sat, May 30, 2009 at 12:34 AM, shristov <shristov at ptt.rs> wrote:

> Jerry Volpe <kg6tt at 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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