[TenTec] Omni VII Speech Processor Question

[Rick - DJ0IP / NJ0IP]

Gary, I disagree, it is not an AF clipper.
It may not do as good of a job of amplifying and clipping as the 715 does,
but then that's a question of design.
If it is operating in the DSP, it is RF, not AF.

Bob says it operates in DSP.  I am assuming he is correct.
The DSP frequency is too high to be AF.
It also means it won't have the harmonic distortion that AF clippers have.

73
Rick, DJ0IP




-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of GARY HUBER
Sent: Friday, March 15, 2013 2:29 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Omni VII Speech Processor Question

I've kept the 715 to use with my OMNI-VII.  I also have a FLEX-1500 as
sub-receiver of the OMNI-VII using the N4PY modification and DXLab Commander
to slave it.  The FLEX-1500 has a panadapter mode with peak hold option
which I use to capture and compare the power distribution in the transmitted
envelope of the OMNI-VII.

The TT-715 speech processer is of course a RF-clipper, external to the
radio.  It may not sound pleasing, but it can increase the average power in
the transmitted (RF) envelope by six dB and get through QRM or poor
propagation.

The internal speech processing of the OMNI-VII being an AF compressor cannot
increase the average power by that much, but it does help you get through.

See http://www.sm5bsz.com/dynrange/dubus405/dubus405.htm for an unbiased
explanation.

I will send png graphics of various microphones and processing methods used
with my OMNI-VII and captured with my FLEX-1500 in panadapter mode direct to
those requesting same.

73 ES DX,
Gary -- AB9M

-----Original Message-----
From: d.e.warnick at comcast.net
Sent: Friday, March 15, 2013 6:37 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Omni VII Speech Processor Question



I had the 715 with my Omni VI+'s and loved it. When I got the Omni VII, I 
used the internal processor (only 10%) and I get so many unsolicited 
comments on the audio during contests and while working DX, that I sold the 
715. I believe the internal processor is RF based, but either way, the other

stations love the audio enough to comment on its quality.

And all this from a guy who doesn't really like SSB, but much prefers CW.

For me, TenTec does it all very well.

73

Dave

WA3F



----- Original Message -----


From: "Richards" <jruing at ameritech.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Friday, March 15, 2013 3:54:22 AM
Subject: Re: [TenTec] Omni VII Speech Processor Question

Interesting -

        Stan at TenTec HQ says the Omni VII built-in
        speech compressor uses "AF Based"  compression.

And... yet...

Page 31 of my owner's manual states:

        "The speech processor used in the Omni VII is a
        DSP generated RF compressor.  ... RF Compression
        raises the average output power... with a digitally
        generated RF speech processor... we have the
        advantage of calculating the RF envelope before
        modulation is performed..."

Page 38 Specifications says:

        "Speech Processor:  RF compression,  0-9 adjustment."


So... perhaps one might understand how I came to wonder about this.
The phrases,   "DSP generated RF compression"  and  "RF compression"  do
not exactly sound like  "AF compression"   to me.

;-)

Parenthetically... I paid my dues and purchased the Model 715 when it
first came out.  I was just wondering if it was redundant, if the Omni
VII function was, in fact, RF-based at it sounded (to me, anyway) in the
owner's manual.

THANKS AND HAPPY TRAILS.

----------------- JAMES - K8JHR ---------------------------- 


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