[TenTec] F.S. New Ten Tec 715 RF Processor

GARY HUBER glhuber at msn.com
Tue Feb 18 22:09:07 EST 2014

Set your radio mic gain  with the TT-715 in the OUT position. The TT-715 has 
an output level setting on the back. With the PROC Gain set to about seven 
o'clock or just about 6 dB of clipping you should set the output level so 
the radio's peak RF output is the same when the TT-715 is IN as when it is 
OUT. Once you have that output level set correctly, you can change the pass 
band and proc gain.  There's plenty of gain in the TT-715 making it easy to 
over drive the radio. Amplified, rising response, and hi-output microphones 
should be used cautiously with the TT-715.

I find using a separate receiver to make recordings for playback is the best 
way for me to make TT-715 Passband and level adjustments with various 

73 ES DX,
Gary -- AB9M

-----Original Message----- 
From: Bry Carling
Sent: Tuesday, February 18, 2014 8:12 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] F.S. New Ten Tec 715 RF Processor

OK thanks - interesting. Who knows then. Must be something magic about those 
microphones and processors.

It could be that the signal level is vastly different from what is expected 
by the processor. Or it
could be that the signal level coming out of the processor is suitable for a 
Tentec radio but
NOT suitable for the Drake radios etc. It certainly sounds to me like 
something was
overdriving somewhere. You may have had some levels set wrong. Generally you 
want to run
the mic gain in the radio a little higher, and reduce the drive level going 
into it. With the
processor it wil lbe very important to use the correct drive level for your 
mic signal going into
it, and have it be at the expected impedance. Any overdriving at any stage 
will produce some
rough sounding audio.

73 de AF4K, Bry

On 18 Feb 2014 at 17:35, Joe W2KJ wrote:

> Howdy Bry:
> The 444D can be switched between HI and LO impedance...so that's not
> the problem...I also used a 600 ohm headset with similar
> results....it's not a mike impedance problem.
> 73, Joe W2KJ
> On Feb 18, 2014, at 4:20 PM, Brian Carling wrote:
> > It sounds like you might possibly have had an impedance mismatch.
> Most attend tech equipment and other modern equipment uses low
> impedance microphones, around 600 ohms.
> >
> > If you use microphones like the Shure 444 and other high impedance
> microphones, they can be loaded down and sound pretty terrible.
> >
> > Best regards - Bry Carling
> >
> >
> >
> >> On Feb 18, 2014, at 4:06 PM, Joe W2KJ <w2kj at bellsouth.net>
> wrote:
> >>
> >> Howdy Gang:
> >>
> >> Last year I bought a model  715 RF Speech Processor from Ten Tec
> and played with it for several months with my Drake gear but
> couldn't get the audio to sound good.
> >>
> >> A couple of weeks ago I called Ten Tec to let them know that the
> 715 wasn't working well with my Drake gear so they told me to send
> the unit back to them for a look-see.
> >>
> >> I received a brand new unit last week and still had the same
> problem of poor audio with my Drake gear...using a 444D mike
> provided excellent audio with the Drake stuff but not through the
> 715.
> >>
> >> Since the 30 day return policy was no longer in effect I couldn't
> get a refund from Ten Tec.
> >>
> >> I was told by a Ten Tec rep that a similar complaint was received
> from an amateur not getting good audio from his Collins gear with
> the 715.
> >>
> >> I guess the 715 is designed to work with newer gear...I have also
> heard that the 715 was designed to work FB with more "restricted
> audio" microphones...not sure exactly what that means though.
> >>
> >> The 715 gets excellent reviews on eHam Product Reviews..all using
> newer equipment not vintage gear.
> >>
> >> In any event, I appreciate the support I received from Ten Tec
> and have decided to sell the 715  since I can't use it with my Drake
> gear.
> >>
> >> I offer the unit for sale...it is brand new.....will ship for
> $175.00.
> >>
> >> It comes with a cable designed for Ten Tec equipment.
> >>
> >>
> >> Digital picture on request.
> >>
> >> Many thanks.
> >>
> >>           73, Joe W2KJ
> >>
> >>
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