Rick, I agree completely with you about the ACC1 connections for the 756 Pro Series. Your observation about the 746 ACC1 pinout confirms my suspicion that it is not different than the 756.
The 6 pin mini data jack on the 7000 actually has the same pinout as the 703/706 and 746 Pro - this according to the Tigertronics website. Note: For certain types of connections the 7000 does have issues with mic muting [per Tigertronics site]. There are two things I like about the SL-USB. It draws power from the USB connection and it frees up the computer's soundcard for other duties. In fact, I like it so much I purchased a second one for portable ops with an SGC 2020! 73 / Larry / W2ZEY -----Original Message----- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Rick W. Sent: Monday, June 16, 2008 2:29 PM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] Microphone putting audio into PSK transmissions Larry, I have a 756 Pro 2, which should be identical to the Pro 3, and on all the diagrams for interfacing, the 746 series should also be the same. I know that the 746 has the ACC1. I only use the ACC1 on my Pro 3 by connecting to the audio in, audio out, and PTT. I don't know the command structure of the 746, but if it does not have a "D" mode to turn off the mike when operating in digital modes, from recent comments, doesn't the 746 series have the same 6 pin mini DIN as the IC-7000? My understanding is that the circuit is designed to mute the microphone if the PTT is activated. I suspect that some of the more expensive interface units use the 8 pin DIN in order to get operating voltage from pin 7 which is NOT available on the 6 pin mini DIN. But you won't need this, if you are using interfaces such as the Unified Microsystems SCI-6 (gets enough from the serial keying line to trigger the optoisolator) or the Tigertronics SignalinkUSB (gets it from the USB side of the connection). Bonnie's suggestion of modifying the microphone is another solution. I kept thinking about any pitfalls in doing that and realized later that her solution will disable VOX operation. This is likely why the manufacturers don't have it as a default. However, I doubt that many of us would need VOX with a handmike. That would be a nice feature to include in software control. 73, Rick, KV9U
