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Connect Plus agressive site switching

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Anderegg

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Anyone know some better CP CPS settings that will force more aggressive site switching? The stock settings programmed by the system admin allow the radio to linger on 1 bar far too long, resulting on lots of transmissions coming in broken and "digital", until I force a site switch to full 5 bars. The radio doesn't talk to me much, so not too concerned about it switching during conversations or incoming calls.

Thanks!

Paul
 

RFI-EMI-GUY

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You might want to refer to the system planner. The RSSI value is what needs to be tightened up. Also for reliable talk back from a low power portable vs medium power mobile, you might want that portable forced to switch even sooner based on the decibel ratio of the erp of the portable vs mobile.

If you have access to TSB-88 you can calculate the specific expected signal level in dBm for the circuit merit desired . For example you might design for DAQ 3.4 but be OK with the roaming hand-off to occur when the signal corresponds to DAQ 3.0 which would be aggressive, or DAQ 2.0 which would be significantly degraded and less aggressive. However once you base these on talk out, you might need to tighten up further for portable talk back.

This can be all planned to the numbers with some calculations, but ultimately you may want to field test in different environments, such as rural versus urban.

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RFI-EMI-GUY

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I should have mentioned, this is for a mobile.

Paul
Then your task will be simpler.

Get the latest version of the MotoTrbo System Planner 68-80309T12 and read section 2.63 Roaming Considerations.

The RSSI is a value between -80 dBM (strong signal) and -120 dBm (weak signal).

The default is -108 dBm, which by my estimation should be a DAQ 3.4 threshold.

I would start by setting it there and then as necessary bump it up in 3 dB increments until just right or if too aggressive then back down 1 or 2 dB.

Also read the entire Chapter 2.6 Site Roaming and make sure you understand how the system and mobile are programmed. The radio builds an adjacent site list and if none exists, it may not know to switch until you force it.

Let su know how it turns out.
 
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