[ICOM] Wave Files not keying IC746 VOX

[Gary Fiber]

Working at Icom America and supporting these radios from 1989 to 2001 I can
tell you  none of the ACC pins go through the VOX circuit. That input in the
back is of a fixed level and as I remember after the mic amplifier circuit
after the VOX amplifier. 
Your IC-746 is working correctly. If you require VOX then you need to
connect to the mic jack or utilize some other method of doing automatic PTT
keying.. If you ground the PTT pin on the ACC jack the radio will go into
transmit.

Hope you get it working to your satisfaction.

Gary K8IZ



-----Original Message-----
From: Icom [mailto:icom-bounces at mailman.qth.net] On Behalf Of Mike
Sent: Wednesday, January 20, 2016 8:29 PM
To: ICOM Reflector
Subject: Re: [ICOM] Wave Files not keying IC746 VOX

Hello,

Thanks for all the help to get a wave file to play through the IC746 without
having to manually use the PTT on the IC746.  So far all I'm starting to
agree, audio input to the radio via the accessory socket doesn't go thru the
VOX circuit.

A CQ wave file can be used through the accessory socket, pin 4, and drive
the radio to full output.  However, have to press the "TRANSMIT" button
(PTT) on the front of the IC746 to get the radio to use the CQ wave file.
Wondering if N1MM+ provides a PTT when a wave file is triggered by a
function key?

If N1MM+ does generate a PTT command, have not been able to get it to the
radio.  Tried different N1MM+ Config, Hardware com port combinations without
any success.

Do have the Icom Service Manual and Instruction Manual for the radio, but
haven't been able to definitely figure out if the accessory socket audio
input goes into the VOX circuit.  Very convoluted schematic.

Not much information in either Manual regarding the VOX.   All the VOX info
refers to the audio from the microphone.  The only thing found in the
Manuals about the accessory socket audio input is the Input Impedance of 10
KOhms and Input Level of Approx. 100 mVolts rms.

Again, the wave audio input to the accessory socket pin 4 drives the radio
to full output when the PTT is manually actuated when the wave audio is sent
from the computer.  One other input is the audio into pin 4 on the accessory
socket from another program, MixW2, for BPSK31 works fine, but
MixW2 does provide a PTT connection when the BPSK31 audio is provided by the
computer.

The wave files have been successfully used in the past with Writelog.  I'm
not sure if Writelog provides a PTT command when a wave file is activated
though.

  73,
  Mike, K4GMH

On Wed, Jan 20, 2016 at 12:12 PM, Tony Hwang <dragon40 at shaw.ca> wrote:

> I think the computer output should be at line level to trigger the VOX.
> Tried to play music on the air?  Is it allowed?
> 73,
> Tony, VE6CGX
>
> Mike wrote:
>
>> Trying to get my IC746 to transmit using the VOX when a Wave file is 
>> played from the computer.  The 746 does work when the "TRANSMIT" 
>> button on the front panel is engaged and the function key is pressed.  
>> Then the Wave file will drive the radio to full output and sounds 
>> good when listening using the built in monitor on the 746.  Also, VOX 
>> works without pushing the "TRANSMIT" button using a microphone.
>>
>> The wave file comes from the computer into the 746 via ACC1, pin 4.
>>
>> N1MM+ is the contest S/W being used.
>>
>>    73,
>>    Mike, K4GMH
>> ----
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> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom 
> Users Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: 
> http://www.qsl.net/icom/ To support QSL/QTH.net: 
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----
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