Re: [TenTec] Heil ProSet adapter with Orion -- hum

[Bruce Small <bsmall@adelphia.net>]

Duane:

I ran into the same problem with my ProSet that you did, and learned by 
trial and (much) error that figure 2-5 in the Orion manual is to be 
taken literally. The Mic ground and the shield must remain separate, or 
else you get distorted audio. I know the "whine" you wrote about as well 
- on Hamalyzer it looks like three harmonically-related tones at 
approximately 880 Hz, 1760 Hz, and 2640 Hz +/-.

The Heil adapter cables tie together the shield and Mic ground. If you 
disconnect the microphone but leave the adapter connected to the Mic 
jack, activate PTT and you can still hear these tones.

In the end I made up my own adapter cable, using two conductors for the 
microphone and one conductor plus the shield for PTT, just like figure 
2-5. After an evening of cutting, soldering, and cussing, operation is 
just what it is supposed to be.

73,
Bruce KM2L

Duane A Calvin wrote:

> Here's a quick report on what I found.  By taking pin 2 to the connector
> case (pin 1 is mic, pin 2 is shield), the audio gets becomes distorted -
> buzzy..  Turning on the speech processor, even on just "1" the audio
> picks up an additional buzz almost like my voice was bouncing off a big
> metal sheet.  Very odd.  Master reset (just for grins) was no help.  If I
> use the TT 706 mic, or their hand mic, there is no problem, and the audio
> sounds fine.  So, it's something in the Heil setup, but I'm not sure what
> yet.
>
> Also, while troubleshooting this, I checked 10m SSB freq's for the first
> time on this radio and found it has some sort of oscillation on both RX's
> starting gradually around 28,350 and continuing to get worse all the way
> up to 29710.  Guess a note to Paul is the next due....
>
>        73,  Duane
>
>
> --------------------------------------
> Duane Calvin, AC5AA
> Austin, Texas
>
> http://home.austin.rr.com/ac5aa
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>  

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