[arm-allstar] FT-2900R COS Signal

[Joe]

Thanks Doug. I guess I need to understand COS a bit more. It appears that COS is a digital low or high (0V or +5V). I did find AF mute on a 16 pin DIP at pin12, so I guess I need to probe it with my logic probe while listening to squelch open and closed on a received signal.

I don't have a scope but I think my logic probe will give me enough info. I wonder if I have to buffer that signal if I try to use it as a COS line for the URI, if the URI loads that signal down too much, or if I can just take the signal right off that pin. I suspect no buffer would be needed.

Time to look at the URI schematic too...

Thanks.

Joe Lauricella, AD2DX
joe at AD2DX dot US
609-737-7064
________________________________
From: arm-allstar-bounces at hamvoip.org [arm-allstar-bounces at hamvoip.org] on behalf of Doug Crompton [doug at crompton.com]
Sent: Friday, March 27, 2015 11:20 PM
To: BeagleBone Black ARM Allstar
Subject: Re: [arm-allstar] FT-2900R COS Signal

Joe,

 Check out the service manual -

http://elektrotanya.com/yaesu_ft-2900r_sm.pdf/download.html

main unit schematic.  It looks like AF mute is a place to look. You will need to check levels with a signal. It is best to have a low (0 volt) signal on PL receive.


73 Doug
WA3DSP
http://www.crompton.com/hamradio


________________________________
From: joe at ad2dx.us
To: arm-allstar at hamvoip.org
Date: Fri, 27 Mar 2015 21:52:25 +0000
Subject: [arm-allstar] FT-2900R COS Signal

Hi Folks,
Does anyone know where I can find the COS signal inside the Yaesu FT-2900R? I can get TX/RX audio, PTT and ground from the outside of the unit but I poured through the schematics and cannot locate COS.
Thanks in advance.
73
Joe - AD2DX




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