Crossover Channel

[sammyg512]

Heya,

I've currently got a Motorola Radio System, using DP4400 and DP4400E radios, without a repeater which we use at events, and in venues. Currently they are in Analog Mode, as this seems to work better in loud environments.

The venue has a bunch of PMR Radios, and we would like to set the radios up, to they can recieve on the PMR Channel, and send on the PMR Channel for a few seconds after transmission, but remain on the Licenced Frequancy.

Basically, so venue staff can speak to us, and we can respond to them but then default to the Licenced Frequancy.

Is this possible, if so how would it be done.

Many Thanks in Advance,
Sam

 

[buddrousa]

Sam you need to talk to a local radio shop about your wants for mixing 2 different Radio Systems not a group on a Hobby Site.
The reason for this is both parties have to have written permission to use each other's frequencies along with some type of control of the bridging system.

 

[ramal121]

Scan with talkback enabled.

 

[mmckenna]

PMR has some very specific limitations and your Motorola radios may not meet those requirements. You would need to check with whatever agency in your country oversees the radio spectrum to see what the rules permit. Here in the USA, Land Mobile Radio and FRS (similar to PMR) are not something you can mix legally.

If it is legal, or you just don't care about following the requirements in your country, then as @ramal121 said, scan with talkback enabled.

 

[Mike_G_D]

A completely legal but slightly cumbersome method could be that you have one channel on your groups radios programmed to receive on the PMR channel that the other group uses (maybe pick one they don't use often and just for special cases) and transmit on one of your legally licensed channels (again, pick one that is a little used "spare/backup" if possible) and then have a dedicated someone in the other (PMR users) group use a simple portable scanner that they can monitor your channel on. For you and your group no other radio is needed since you are just receiving the PMR channel and not transmitting on it so as to keep it legal and are just transmitting on your properly licensed frequency. But for them - cumbersome part - they would have to use another radio to receive your transmissions unless, of course, their PMR radios can also be programmed for "out of band" receive which I doubt they can. But if the need is infrequent then it may work. They would pick some key person to be the "monitor guy" for your transmissions or maybe even more than one of their group if they are willing and the scanners are available, etc. You don't need a fancy expensive scanner since it is just for standard NFM analog (my understanding of PMR is that it is analog while the dPMR variant is a proprietary form of digital sort of similar to NXDN but not - hopefully the group you want to communicate with is using the analog variant). Just a simple analog only basic portable scanner that can receive in the band your radios operate in and has the ability to use DCS or CTCSS (for sanity's sake) so that they can be programmed to listen on one of your channels with the correct CTCSS or DCS setting. Not a bad idea to maybe buy a few such radios and have them on hand to take to events and hand out to the venue's staff as needed for this kind of thing - make them part of your standard event kit. Get the cheapest you can and I doubt it would seriously dent your budget to have at least three or four such scanners/receivers available to hand out if desired for exactly this kind of usage and if one goes missing or gets damaged the cost to replace would not be too high.