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[Taxi_Driver]

So, is it the case that the data isn't getting through when the signal is perfectly OK for voice comms?

If so, I wonder if the radio is over / under deviating when sending data?

Sounds like it'd be better to rely on a smartphone app and internet connectivity in this day and age than squirting data down your PMR link, though.

Yes.....

Anyways im confused a tad....some peeps says the freq is too close to another tx.....others says it should be fine......

One firm in Swindon uses a mobile network....not sure how that monitors the cars tho.....im gps tracked 24/7 when my data unit is on.....if they 'track' all their cars thats probably a fair bit of data they pay for 

[Kevin Wood]

Well, I would say that the frequency issue is a red herring, as long as the radios are set up correctly they should co-exist happily. If the data uses different frequencies and power levels, then the fact that voice works doesn't prove a lot, other than the signal path is basically OK. If the data power level is a few db lower, then, if the voice isn't scratchy, I'd say the data should be working, so the question is why isn't it?

[Gaffers]

attenuation or signal quality?

[Taxi_Driver]

Well, I would say that the frequency issue is a red herring, as long as the radios are set up correctly they should co-exist happily. If the data uses different frequencies and power levels, then the fact that voice works doesn't prove a lot, other than the signal path is basically OK. If the data power level is a few db lower, then, if the voice isn't scratchy, I'd say the data should be working, so the question is why isn't it?

ok thanx guys, not that then.....

[Marks DTM Calib]

Does data performance inprove as you get closer to the base?

The question as to if the channel spacing is to small is very dependent on the quality of the transmissting kit (and to a lesser extent the receivers).

Given there are potentialy two 'more optimised' base sattions close together, the vehicle transmitters could easily be swamped by a poor local base transmitter nearby.

 

[Taxi_Driver]

Does data performance inprove as you get closer to the base?

The question as to if the channel spacing is to small is very dependent on the quality of the transmissting kit (and to a lesser extent the receivers).

Given there are potentialy two 'more optimised' base sattions close together, the vehicle transmitters could easily be swamped by a poor local base transmitter nearby.

Yes....tho my firm run 3 transmitters.....dotted about the town....to try to improve performance and cover blackspots....the other firm i mentioned runs two transmitters...

The receivers in our cars are 'suppose' to lock onto the stongest signal.....but doesnt always work..

[zirk]

Does data performance inprove as you get closer to the base?

The question as to if the channel spacing is to small is very dependent on the quality of the transmissting kit (and to a lesser extent the receivers).

Given there are potentialy two 'more optimised' base sattions close together, the vehicle transmitters could easily be swamped by a poor local base transmitter nearby.

Yes....tho my firm run 3 transmitters.....dotted about the town....to try to improve performance and cover blackspots....the other firm i mentioned runs two transmitters...

The receivers in our cars are 'suppose' to lock onto the stongest signal.....but doesnt always work..

On 3 different frequencies?.
Unless to System is Trunked or has Selective Voting, the Mobile will just pick a usable Signal not necessary the strongest one.