[TenTec] Audio quality issue in Heil headset with Omni V

[k9mi at sbcglobal.net]

Rick,
I use the Heil headset pro using the dx5 element. One thing I've found to 
quiet down a bit of a hum in them, is turn the tone control fully counter 
clockwise. My speech monitor does a really good job at around 1/2-3/4 open. 
This was really a nice suprise to have the monitor since the Omni 6 opt 3 
does not have that feature.

Ok, sorry I've read a little more Rick. It's 4am and I can't get to sleep so 
excuse me if I miss something you've said. Is the mic adapter one purchased 
from Heil for Ten Tec 4 pin, or one that has been reworked? Either way I'm 
sure it's right, but just trying to see the differences between mine and 
yours, if any.

Is the sound ok coming thru another speaker with the headphones off. Not 
sure if you have a hand mic, I don't. So I'm hearing through the headset all 
the time I'm operating.I'll fire the rig up and see if I notice anything. My 
only nusiance has been having the tone control turned up. I don't notice any 
difference on the tone setting when I use the speaker in the 960ps. If I can 
thing of anything else, I'll send it along. My doctor gave me a prescription 
for Prednizone, so I'm wired and my blood sugar jumped to 274, so I doubt I 
get any sleep tonight.

73, Mike K9MI



----- Original Message ----- 
From: "rick denney" <rick at rickdenney.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Saturday, October 13, 2007 04:46
Subject: [TenTec] Audio quality issue in Heil headset with Omni V


> As I have worked through integration issues with my new (to me) Omni
> V, I'm finally ready to try and understand an issue I've had all
> along.
>
> In my Heil Pro Set headset, the sound from the headphone output of the
> Omni is distorted. There is a loud fuzz in the audio.
>
> I have the monitor volume turned up so that my voice in the boom mike
> is about the same as the person I'm communicating with when the audio
> is where I want it. But at any volume setting of either AF or the
> monitor pot, I get the distortion.
>
> I don't get the same problem with these headphones plugged into my
> Kenwood TS-430, so it doesn't seem to be fault in the headphones.
>
> The audio does not show clipping on a scope, with the scope lead
> connected to the center pin on the headphone receptacle. I mean, I can
> MAKE it clip, but that sounds no worse than if I don't, especially
> when the processor is enabled. The point is, when I look at a
> sine-wave output in the headphones, I don't see the fuzz that I'm
> hearing in my ears when I plug the headphones back in. That tells me
> that the headphones themselves are part of the problem.
>
> The sound I'm hearing seems like it would be cause the waveform to
> glitch with transients, but I don't see that. The waveforms look
> smooth.
>
> My ears seem to think it's an impedance mismatch between the
> headphones and the audio output. It doesn't seem to be in the
> transmitted output, but I haven't had enough signal reports to know
> for sure.
>
> Any ideas of things to check?
>
> Rick, KR9D
>
> ---
> Richard W. Denney, Jr. PE|Iteris, Inc.
> Associate Vice President |107 Carpenter Dr. Ste 230 |    703.925.3819
> rwd at iteris.com           |Sterling, VA 20164        |Fax 703.471.1757
>
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