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A Swift Summary
A number of the circuits shown in this document are not really practical for reasons explained on that page, however, they would all work as rebroadcast
devices as the fundamentals of operation are adhered to throughout. Two SRM9000 radios and a crossover cable.
The idea is that practical circuits have been provided for those who can follow them and hopefully, enough detail is there to stimulate questions from those
who can’t. The intention isn’t necessarily that anyone slavishly follows the circuit chosen although there’s nothing to stop you doing that if you wish.
You will see from the diagrams that not all possible combinations have been described. Where I describe programming and a controlled relay, a dash-
mounted switch can often be used instead. In most cases, you can use whichever method you prefer.
As far as I can see, just about any combination of operational usage can be applied to any of the circuits. There are elements of programmed control and
facilities, or selcall control, that can be used alongside a purely mechanical on/off arrangement. You can select the options you would like to use or the ones
you think your team will be happy with, and speak to the person(s) responsible for that version for any details you need, or clarification as to whether some-
thing different might work.
There is now a lot of practical expertise available to us, we only have to make use of it.
This document isn’t by any means definitive. It’s primary purpose is to show you what has been done with the equipment that, by and large, we already
have. The level of complexity at which you decide to stop is up to your judgment of how it will be used by your team. None of the variations are necessarily
‘better’ than any other as they all use the same basic principle. In fact if you examine it very carefully, you’ll see that the fundamentally most important com-
ponent in all the versions, is the cross-over cable consisting of seven wires and two plugs. Without one of these, none of the re-broadcast devices would
work.
Pick whichever one you think your team can operate and, between us all, we have the expertise available to get it going.
Even all of this is only the beginning, Voice over Internet Provider (VoIP) is not only used to make telephone calls. Try looking at www.446user.co.uk and
you will see that even the humble PMR446 radio with a nominal range of about 3 kilometres can be used to talk to anywhere in the world. Radio amateurs
already use the ‘EchoLink’ and D-Star systems to do the same thing. Communications is changing rapidly and the days of the simple analogue radio may well
be numbered. However, that day hasn’t arrived just yet and there’s still a lot that can be achieved if it’s not the rest of the world you want to talk to!
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