[ICOM] Wave Files not keying IC746 VOX

[Kelly Taylor]

Hi Mike,

Are you going through a transistor on the PTT line?

I believe, and the suggestion of a 2n2222 in the N1MM manual suggests, the line goes HIGH on PTT, not low. 

Depending on your configuration, try looking at either the DTR or the RTS line on a scope. If you see it go high when the .wav file plays…



73, kelly
ve4xt


> On Jan 20, 2016, at 10:29 PM, Mike <k4gmh at arrl.net> wrote:
> 
> 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
>>> ----
>>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
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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: http://www.qsl.net/donate.html
>> 
> ----
> 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: http://www.qsl.net/donate.html