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Interferance between two Digital channels on different Time Slots

com501

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Sep 28, 2003
Messages
1,351
Location
127.0.0.1
DMM repeater operation is problematic if you want to actually converse. Make all the radios either analog or digital. What kind of portable radios are you using?

On Motorola radios, you need to specify a TX Contact in order for the channel to work. You DO NOT need to specify an 'RX Group List'. The radio will automagically receive the contact code and contact code ONLY and ONLY on the slot you specify.

Please get some training. Is this an amateur or commercial installation? If commercial, get someone to make sure your radios are programmed in accordance to your license.

As stated before, you need a professional to set this up for you.
 

salarazad

Member
Joined
Jun 8, 2020
Messages
58
Is the analog side of the repeater still active? Analog radios will here interference from the digital side. Just a guess
It is actually still ON because the repeater is on DMM mode, but nobody is using the Analog anymore; but I wonder could there be an interference between Analog and Digital, I means someone on Digital could hear someone PTTing on Analog, or the reverse?
 

salarazad

Member
Joined
Jun 8, 2020
Messages
58
DMM repeater operation is problematic if you want to actually converse. Make all the radios either analog or digital. What kind of portable radios are you using?

On Motorola radios, you need to specify a TX Contact in order for the channel to work. You DO NOT need to specify an 'RX Group List'. The radio will automagically receive the contact code and contact code ONLY and ONLY on the slot you specify.

Please get some training. Is this an amateur or commercial installation? If commercial, get someone to make sure your radios are programmed in accordance to your license.

As stated before, you need a professional to set this up for you.
We have set a TX Contact for the channel, but didn't set an RX Group List, that is why the channels are working but not using the Talk Groups concept.

We have received an official training from a Motorola partner but we are still new to Digital, and that is why I'm guessing that we might have done some programming errors. And we are using mostly Motorola radios but we only have a few radios, it is a small place.

What do you mean by problematic? could it creates interference between the two Digital channels even if they are on different time slots?
 

jonwienke

More Info Coming Soon!
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Jul 18, 2014
Messages
13,028
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VA
Analog doesn't have time slots. If analog is still active, and still programmed in the subscriber radios, then everyone on the frequency is going to hear an analog call, regardless of how the digital side is programmed in the handhelds. If you're having issues with intermittent bleedover between timeslots, that sounds like the most likely culprit.

Try disabling mixed mode on the repeater, and clearing out any analog programming in tbe handhelds, and the problem will likely go away.
 

dazey77

Member
Joined
Jan 30, 2015
Messages
104
We have set a TX Contact for the channel, but didn't set an RX Group List, that is why the channels are working but not using the Talk Groups concept.
I don't think you quite understand the talk groups. When you set no RX group list it means that the channel is locked to the TX talk group. If you set the TX as TG1 then that channel will only recieve TG1. Setting a group list lets you allow multiple talk groups to be recieved. You are still using talk groups, you just dont realise it. Private calls operate outside of this. You can private call another radio, on the same freq, slot and CC even if its listening to a different talk group.
 

salarazad

Member
Joined
Jun 8, 2020
Messages
58
I don't think you quite understand the talk groups. When you set no RX group list it means that the channel is locked to the TX talk group. If you set the TX as TG1 then that channel will only recieve TG1. Setting a group list lets you allow multiple talk groups to be recieved. You are still using talk groups, you just dont realise it. Private calls operate outside of this. You can private call another radio, on the same freq, slot and CC even if its listening to a different talk group.
Thank you for the explanation, you are right I didn't get it before, but now it is clear to me that a Digital channel does not work without a talkgroup.
 
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