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[TenTec] TNC hookup to Omni

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Subject: [TenTec] TNC hookup to Omni
From: ko4a3@juno.com (Harold J Kohl Jr)
Date: Thu, 6 Nov 1997 17:14:55 -0500
I tried the same thing.  I found I had RF feed back into the rig. 
Remember the Mic input and the Audio input at the back of the rig are
both hot anytime the PTT is keyed.  I have not fixed my problems yet. 
Looking at using the RTTY keying instead of audio. 

John K.

On Thu, 6 Nov 1997 08:48:21 MST ki0er@juno.com (R Ogborn) writes:
>I just hooked up my new AEA DSP-232 Multi-mode controller to my TenTec 
>Omni D last night (Audio FSK).  I used the RCA patch-in/patch-out and 
>PTT jacks on the back of the rig to interface with the TNC.
>I'm having a problem adjusting the TNC's line out to the rig's 
>patch-in.  Seems the line-out of the TNC's level is too high as it is 
>overdriving the rig.  There is a jumper in the TNC to set the line-out 
>(they call it TX out) to a "low" setting, so I set it from high to 
>low, and re-adjusted the line-out pot, but didn't seem to notice much 
>difference.  I can get it to drive the rig at a reasonable level by 
>turning down the rig's drive control at about 1 1/2 setting, but if 
>moved just a hair, I go to overdrive (ALC lights bright and watts out 
>goes to 105) to nothing.  I want to have full control so I can run QRP 
>if I wish and half power (50 watts) other times.
>I called Timewave, but found that they are not quite set-up yet after 
>the AEA acquisition to help much.
>Can any one help?  Should I just attenuate the line-out more with a 
>resistor?  What value should I start with and does it go inline or 
>across center to sheila?  I'm thinking that it may be an impedance 
>mismatch.  The TNC is supposed to "handle" both high and low impedance 
>inputs.  Looking at the schematic, it appears that the patch-in should 
>have the same impedance requirement as the mic input.
>Thanks in advance!
>R Ogborn - KI0ER
>Littleton, Colorado, U.S.A
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