I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.
GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM’s internal Squelch.
I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.
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But, but, but… it helps to know the words to google! I googled RTCM GM300 and didn’t get the links you did. But I’m here to learn!
Not sure of this line.
GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM’s internal Squelch.
So pin 11 on the GM300 already has the flat audio we seek. But Jumper 551 to the A position is the best audio? OK. Buy why the RTCM’s squelch? I know that we’ve had problems with squelch tails…
···
From: Sam Nabkey
Sent: Saturday, June 20, 2015 5:06 AM
To: R. Wayne
Cc: Allstar app_rpt-users Group
Subject: Re: [App_rpt-users] Wiring a GM300 to a RTCM
Hello…
GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM’s internal Squelch.
I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.
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The GM300 either presents de-emphasized squelched audio or non de-emphasized discrimator audio at pin 11 depending on the position of the jumper inside the radio.
The squelch circuit inside the RTCM is superior to the squelch built into to GM300. Properly calibrated, there isn’t any burst.
I hooked pin 8 to the CTCSS pin on the RTCM so I can use the radios decoder. I also don’t use the RTCM for encoding CTCSS. I let the radio do it.
Both those links should get you rolling.
Your mileage may vary… Caution! Beverage in this container may be HOT!!
I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.
To unsubscribe from this list please visit http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
and scroll down to the bottom of the page. Enter your email address and press the “Unsubscribe or edit options button”
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.
Subject: Re: [App_rpt-users] Wiring a GM300 to a RTCM
The GM300 either presents de-emphasized squelched audio or non de-emphasized discrimator audio at pin 11 depending on the position of the jumper inside the radio.
The squelch circuit inside the RTCM is superior to the squelch built into to GM300. Properly calibrated, there isn’t any burst.
I hooked pin 8 to the CTCSS pin on the RTCM so I can use the radios decoder. I also don’t use the RTCM for encoding CTCSS. I let the radio do it.
Both those links should get you rolling.
Your mileage may vary… Caution! Beverage in this container may be HOT!!
But, but, but… it helps to know the words to google! I googled RTCM GM300 and didn’t get the links you did. But I’m here to learn!
Not sure of this line.
GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM’s internal Squelch.
So pin 11 on the GM300 already has the flat audio we seek. But Jumper 551 to the A position is the best audio? OK. Buy why the RTCM’s squelch? I know that we’ve had problems with squelch tails…
From: Sam Nabkey
Sent: Saturday, June 20, 2015 5:06 AM
To: R. Wayne
Cc: Allstar app_rpt-users Group
Subject: Re: [App_rpt-users] Wiring a GM300 to a RTCM
Hello…
GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM’s internal Squelch.
I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.
To unsubscribe from this list please visit [http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users](http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users)
and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.
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Shouldn’t I also have the RADIO COS/PL VALID pin hooked up to CTCSS LOGIC input on the RTCM? What would the connection be?
···
From: Sam Nabkey
Sent: Saturday, June 20, 2015 6:05 AM
To: R. Wayne
Cc: Allstar app_rpt-users Group
Subject: Re: [App_rpt-users] Wiring a GM300 to a RTCM
The GM300 either presents de-emphasized squelched audio or non de-emphasized discrimator audio at pin 11 depending on the position of the jumper inside the radio.
The squelch circuit inside the RTCM is superior to the squelch built into to GM300. Properly calibrated, there isn’t any burst.
I hooked pin 8 to the CTCSS pin on the RTCM so I can use the radios decoder. I also don’t use the RTCM for encoding CTCSS. I let the radio do it.
Both those links should get you rolling.
Your mileage may vary… Caution! Beverage in this container may be HOT!!
But, but, but… it helps to know the words to google! I googled RTCM GM300 and didn’t get the links you did. But I’m here to learn!
Not sure of this line.
GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM’s internal Squelch.
So pin 11 on the GM300 already has the flat audio we seek. But Jumper 551 to the A position is the best audio? OK. Buy why the RTCM’s squelch? I know that we’ve had problems with squelch tails…
From: Sam Nabkey
Sent: Saturday, June 20, 2015 5:06 AM
To: R. Wayne
Cc: Allstar app_rpt-users Group
Subject: Re: [App_rpt-users] Wiring a GM300 to a RTCM
Hello…
GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM’s internal Squelch.
I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.
To unsubscribe from this list please visit [http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users](http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users)
and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.
To unsubscribe from this list please visit http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
and scroll down to the bottom of the page. Enter your email address and press the “Unsubscribe or edit options button”
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.