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Moffatt MRT’s Suggested Rebro System:
The following suggestion came from James Coles of Moffatt MRT and has considerable merit for it’s stated purpose. Eventually a significant
number of teams will be using these devices and the chances of mutual interference goes up accordingly. Any means by which we can reduce
this risk will increase the usefulness of the re-broadcast devices and allow more than one team to operate simultaneously with others with the
minimum of interaction.
James’ objective is to try and eliminate the possibility of 147.350 opening other team’s repeaters.
His system requires that you program the repeater as a duplex unit with one radio only receiving on the TWC whilst the other would only
transmit on 147.350.
The base would monitor both the TWC and 147.350 but would only transmit on the Team Working Channel. Care would need to be taken to
avoid acoustic feed-back here.
The hill teams would work on the TWC and if they chose could have 147.350 as a receive only channel to listen to the repeater output in their
scan group. Teams would only Tx on the TWC.
This way if another team was deployed using their repeater the only interference would only be from the repeater and this would only open
up the base radio monitoring 147.350 and anyone on the hill monitoring 147.350. With correct placement two repeaters could be deployed
using different TWC with no fear of inference.
147.350 could be easily dropped from the scan group and revert to simplex communications on the TWC without any coordination required.
The advantage of the system shown on the next page:
If the Rebro unit fails back to back will continue function back to back where there is coverage.
Hill parties can take advantage of the repeater to talk to teams non line of sight via TWC.
Nobody needs to leave the TWC to transmit on another channel this is simple and safe.
As the only device Transmitting on 147.350 is the repeater then other re-bro units in the same locality could use the channel too with correct repeater posi-
tioning and thought.
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