Tetra Crosslink or Hotspot to Brandmester?

[vselic]

Dear all,

I'm probably not the only one, who is wondering, if it is possible to Crosslink Tetra and DMR in HAM Radio for use.
For example, if you own a tetra radio station, is there any possibility, to connect to a hotspot, which is connected to Brandmeister DMR?

It would be great for tetra ham_ing, because tetra repeaters are much rare than dmr for example, so it would be a great oportunity for tetra ham users, to make it a much more alive thing.

Probably the first problem is that tetra has 4 slots and 25.000khz widenes.

Best regards
73

 

[ka3jjz]

I don't believe Tetra would be legal on the ham bands....Mike

 

[vselic]

Tetra is tottaly legal on the ham bands too. You have two types of tetra, encrypted and clear mode. The first one is, of course, illigal in ham use - and it uses differrent types of encryption via trunked or direct mode. I won't write about types and steps of encryption, because it doesn't mean nothing to ham use, and you can read on the web, i can just mention TEA, registration, authentification and so on.
The second one is clear one, and in some countries, even HAM repeaters exist. Example is Austria, Italy, Romania etc. If you work in clear mode, than for example two ham operators on for example frequency 433.400 or so, can make a qso without breaking any law. The same would be with the registered repeater. I don't know how is it in USA.

So what i'm wondering is, if there is any option for a somekind of hotspot.

There are some videos on Youtube Cross Link DMR/Tetra Ham Radio - YouTube but this is more or less expensive and useless option.

 

[ka3jjz]

Different countries have different rules. As an example, the UK allows hams access to 70 Mhz, which is not legal here in the US...Mike

 

[vselic]

Hello,

of course we are speaking about one of the possible digital voices, just like dmr, d-star etc. if all the parametres are in legal use:
- legal frequency (so the station supports one)
- ham rules (for example clear mode)
- other rules, regarding country laws

Why are you bothering with illegal acts, which is not my question, because my preposition was, that it's in a legal way.

 

[ka3jjz]

We can't just adopt a digital system, it has to be approved by the FCC before hams can use it. That's part of the rules....Mike

 

[vselic]

Ok, anyways, its approwed in Eu and Australia at least.
We should focus on the question, if this is even possible to do.

 

[AK9R]

Emission standards for amateur radio in the U.S. are contained in §97.305, §97.307, §97.309, and §97.311. If the emission type meets those standards and does not conflict with §97.111 and §97.113 (which prohibits "messages encoded for the purpose of obscuring their meaning"), then it can be used in amateur radio in the U.S.

The question was "is it possible to Crosslink Tetra and DMR in HAM Radio for use". Let's stick to answering the question.

 

[vselic]

Hmm, no ideas?

 

[K5MPH]

Would the hotspot be using Pi-Star ......

 

[vselic]

yeah, that were my toughts too

 

[Pete_uk]

Doesn't Tetra use QAM modulation while most of the others use a FM based modulation? I'm sure there is something technically different in the Tetra transmission.

I was interested to find out there are two Tetra repeaters in England using the same frequency, so one timeslot in and another out?

 

[K5MPH]

Dont Tetra have 4 time slots via TDMA......

 

[Pete_uk]

Yep

 

[vselic]

Yes 25 not 12,5 range