*****SPAM***** [ICOM] ACC1 different in ICOMs??

[Dave Edwards]

Gary....
I wanted to give you a bit of info I just discovered on the IC-970.
I plugged in an empty 7 pin DIN to the ACC1 connector.

The microphone WILL work with the DIN connector plugged in.

While listening on another receiver, I flipped the SEND/RECEIVE over to 
SEND...and touched each pin with a metal dental pick.

When I get to pin 1, I get the telltale sound of 60 cycle buzz.
So, why it is that way I don't know...but is it possible pin 1 is the 
modulation input??

....Dave


----- Original Message ----- 
From: "Gary Fiber" <gfiber at clearwire.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Sunday, September 02, 2007 1:52 AM
Subject: Re: *****SPAM***** [ICOM] ACC1 different in ICOMs??


> Dave,
>
> Pin3 3 - 8 are the same on both the 756pro and IC-970 ACC1 socket. I 
> downloaded the manuals form Icom and printed out the pages.
> On the IC-970 Pin 1 is Mic output main band for the  ATV unit and Pin 2 is 
> ATV Mic output ground.
>
> I scanned through the IC-970 manual and could not spot anything that 
> suggests the mic audio would be cut off when something is plugged into the 
> ACC1 socket. It does however connect directly to the modulator. The mic 
> gain control on the front panel will have no effect on the ACC1 MOD in 
> line. In the manual on  Page 42 I looked shows a level switch, though the 
> manual says its for the DATA jack it may also have some effect on the ACC! 
> Pin 4.The manual is vague as on page 13 it says that Pin 4 does have some 
> separate adjustment. Its been a long time since I have given the IC-970 
> any thought.
>
> Generally you don't want the mic connected when using AFSK for digital 
> modes. The mic element is wired directly for VOX operation so every time 
> the rig is keyed the mic is live, any noise in the shack can mix with the 
> transmitted signal.
>
> I have seen rigs be loaded into partially switching into transmit by some 
> external accessories. The IC-970 had troubles doing satellite tuning with 
> some packet controllers. The opto isolators in the packet controllers 
> would not provide a hard enough ground to the U/D pins. So the fix was to 
> add a 2N2222A and let the opto isolator switch a driving voltage to the 
> 2N2222A and that would make a hard enough ground to get the rig to tune up 
> or Down in frequency. Food for thought something similar could be going on 
> with the mic and the device attached to the ACC1 socket.
>
> Gary K8IZ
>
>
>
> Dave Edwards wrote:
>> I give up for today.
>> I can't figure this one out, I was hoping someone on the list could help.
>>
>> I have a sound card interface (RigBlaster) that works on my 756Pro just 
>> fine. It is connected to the ACC1 port.
>>
>> I switch it over to my IC970 ACC1 port, and no audio gets in to the rig.
>> Sound comes out, transmit/receive works...just no modulation.
>>
>> I tried the mic gain...no effect. It is as if you flip the SEND/RECEIVE 
>> to send without a microphone connected....nothing.
>>
>> Another anomoly that I think is related...
>> With the DIN connector plugged in to ACC1, the microphone no longer works 
>> also.  Pull out the DIN plug, and the mic works fine.
>> On the PRO, the mic works whether the DIN plug is in or out.
>>
>> Anyone have an idea??
>>
>> ....Dave
>>
>> ----
>> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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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/