Wow I was looking for that info for some project I am working on..
You never know where some of the info you need will be poping out from 
From: Steve Zingman
Sent: Tuesday, October 06, 2015 11:17 AM
To: Steven Donegan
Subject: [App_rpt-users] SA-828U 'COR'
I
can confirm the 828 has the second harmonic on my IFR 1200S
For RUS you want pin 1 of the MIX2009 audio chip. (under the shield)
On 10/6/2015 9:30 AM, Steven Donegan wrote:
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For RUS you want pin 1 of the MIX2009 audio chip. (under the shield)
On 10/6/2015 9:30 AM, Steven Donegan wrote:
Other than using a Pi 2, and the newer/cleaner 828 module, Doug's setup based on the 818 module is exactly what I will be trying. Thanks for the info!
From: Steve Zingman mailto:szingman@msgstor.com
To: Steven Donegan mailto:donegan@donegan.org
Cc: mailto:app_rpt-users@ohnosec.org mailto:app_rpt-users@ohnosec.org
Sent: Tuesday, October 6, 2015 6:17 AM
Subject: Audio detection circuit to generate 'COR'Steve,
Be aware that those transmitters are dirty.
There is a note about a module using the same RF circuit on Doug's HAMVIOP site.
He suggests a filter. REQUIRED if you are going to drive a amp or even connect it to a antenna!
73, Steve N4IRS
On 10/6/2015 9:13 AM, Steven Donegan wrote:Thanks. For my first full duplex repeater (for test/learning purposes) I am going with 2 of those modules and a 6 cavity duplexor (likely of the 'notch' variety). If it works out may put my Mirage BD-35 on the TX side before the duplexor and get ~16 watts for giggles.
From: Steve Zingman mailto:szingman@msgstor.com
To: Steven Donegan mailto:donegan@donegan.org
Sent: Tuesday, October 6, 2015 6:10 AM
Subject: Re: Audio detection circuit to generate 'COR'I'll send you the info tonight when I get home. I have a couple of them.
On 10/6/2015 9:10 AM, Steven Donegan wrote:Thanks Steve! I'll look into that as well.
From: Steve Zingman mailto:szingman@msgstor.com
To: Steven Donegan mailto:donegan@donegan.org; mailto:app_rpt-users@ohnosec.org mailto:app_rpt-users@ohnosec.org
Cc: mailto:app_rpt-users@ohnosec.org mailto:app_rpt-users@ohnosec.org
Sent: Tuesday, October 6, 2015 6:06 AM
Subject: Audio detection circuit to generate 'COR'Steve COR or actually RUS "Receiver Un Squelch" is available in that radio. You have to unsolder the shield to get to it.
73, Steve
On 10/6/2015 8:56 AM, Steven Donegan wrote:Well, it is a generic question - any radio without COR. The specific model in my case is a UHF radio module model # SA-828U: http://www.alibaba.com/product-detail/1W-5km-distance-SA828-U-uhf_60092524887.html?spm=a2700.7724857.29.62.Xbg6c5
From: Skyler Fennell mailto:electricity440@gmail.com
To: Steven Donegan mailto:donegan@donegan.org
Cc: app_rpt-users@ohnosec.org
Sent: Tuesday, October 6, 2015 5:47 AM
Subject: Re: [App_rpt-users] Audio detection circuit to generate 'COR'That might work, I use it for packet.What radio are you on?
Sent from my iPhoneDoes anyone have a circuit that will take audio from a radio and generate a pseudo COR signal for the URI-x? If so would you share the circuit diagram?TIA_______________________________________________
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