[arm-allstar] GM300 URI Radio/Interface settings

[Doug Crompton]

Steve,

 I have not personally interfaced that radio but I know others who have. When you program the radio I believe you have the option of using deemphasized or non deemphasized audio. How ever that is setup you would also need to enable or disable deemphasis in simpleusb.conf to match - conversely the same is true for transmit audio. The RPi2 also has a setting for preemphasis in simpleusb.conf.

It the settings in simpleusb.conf are not matched with the radio you will have crummy sounding audio and DTMF tones will not decode properly.

So the bottom line is you need to get the equalization and levels set correctly.  Levels on RX are set by item 2 in the simpleusb-tune-menu program and are also effected by the rxboost setting in simpleusb.conf. If the level is not attainable with any setting and it is high you may need to cut down the level coming in with a resistive divider.  

Item 3 set the TX level.  RX and TX refer to the node radio, connected to the FOB, RX and TX. 
73 Doug
WA3DSP
http://www.crompton.com/hamradio


Date: Wed, 15 Jul 2015 00:06:50 -0400
From: steves68 at gmail.com
To: arm-allstar at hamvoip.org
Subject: [arm-allstar] GM300 URI Radio/Interface settings

I am setting up a node with a Motorola GM300, Raspberry PI2 and URI and was looking for some pointers for the Node Radio/Interface setting. I there anyone who might be able to direct me to some information. I have everything connected but having a heck of a time getting the settings for RX audio to work. I will leave the description of my issues to a minimum at the moment. Just hoping to find a resource to some info from someone that has used the same combination. 
Thanks
Steve (N4YOG)

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