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DMR interference problems

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2wayguy

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Norcross, GA
I have been hearing about interference problems all over the country created by DMR TDMA systems. Recently the PSCC has requested that the FCC limit all new VHF licensing to 10 watts. Does anyone know whether the same problems exist with UHF DMR TDMA systems?
 

W2NJS

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Your story does not make sense, especially in view of the widespread use of DMR systems today throughout the US as well as in foreign countries. I use DMR in the RF-congested area of Washington on UHF for both simplex and repeater operations, as well as IP connections to DMR amateur stations in several foreign countries. In my experience DMR is a clean operating system with no problems.
 

rickak

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Mar 30, 2003
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Location
Fort Collins, CO
Seems to me they're talking about frequency sharing, when multiple repeaters exist on the same frequency.

The interference received can generally be classified as an instance where a channel was successfully shared when the usage
averaged around 10% and now either approaches or is at a 100% duty cycle.
Yes, .DMR repeaters chatter much more than analog ones. I can see how that would be a problem.

Rick
 

VK5ZEA

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Dec 11, 2011
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PORT LINCOLN South Australia
I thought DMR/Mototrbo repeaters transmit all the time regardless of actual user activity... someone told me this was so that the mobile/portable radios could synchronize to the TDMA time slots properly.

I am happy to be corrected if I am mistaken.

Michael.
VK5ZEA
 

Forts

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Regular TRBO channels will transmit a beacon every so often (usually just a quick little braaaaap). The interval for this can be anywhere from every 10 seconds to every 10 minutes, depending on how it was programmed. Capacity Plus systems transmit every few seconds to tell subscribers which LCN is the rest channel and where call activity is taking place. And like Mike said, Connect Plus transmits continuously like any other trunked system control channel.
 
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