DStar, and DMR radio are two different modes.

73 N2DYN Angelo


-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Barry
Sent: Friday, March 06, 2015 4:02 PM
To: [log in to unmask]
Subject: Fwd: DMR radio

Sent from my iPhone

Begin forwarded message:

> From: Barry <[log in to unmask]>
> Date: 7 March 2015 4:58:23 am AWST
> To: "[log in to unmask]" <[log in to unmask]>
> Subject: Re: DMR radio
>=20
> Greetings.=20
> I'm totally blind and have been enjoying d-star for 12 months. I'm 
>also us=
ing fusion. Haven't yet tried some yet=20
> Cheers.=20
> Barry VK6SP.=20
>=20
>=20
> Sent from my iPhone
>=20
>> On 7 Mar 2015, at 1:30 am, Maurice Mines <[log in to unmask]> 
>> wrote:=

>>=20
>> Good morning everybody, as far as I know dstar,  this the Jesu method 
>>of =3D=

>> digitizing FM UHF VHF radio transmissions are both inaccessible to 
>> the =3D=

>> blind.at this time.
>> So as far as I know nine people be able to make any use of the 
>> digital =3D=

>> FM radio transmissions hardware and software it completely out of the 
>> =3D=

>> question at this time. Can someone correct me if I=3DE2=3D80=3D99m 
>> wrong?=
 =3D
>> Hopefully one day someone will come up with a method to make this =3D 
>> possible. The other issue that many of us have to think about is that 
>> =3D=

>> the solution found it will be very costly. Considering that the last 
>>=3D  time I priced dstar  equipment, the price was extremely 
>>prohibitive. =3D  That=3DE2=3D80=3D99s just my two cents worth for this
discussion.
>>=20
>> Sincerely Maurice mines.
>> message number, 505-369-3283. Note that the text that I have written 
>>has =3D=

>> been dictated by using Dragon 4.0 for the Mac, some words, spellings, 
>> =3D=

>> and/or syntax errors, may be the result provided the software or the 
>> =3D dictation process.
>> Amateur radio call sign, kd0iko.
>> 73 to all and have a good weekend chasing the exit 
>> that=3DE2=3D80=3D99s w=
hat =3D
>> you=3DE2=3D80=3D99re interested in doing.
>>> On Mar 4, 2015, at 8:21 AM, Bob Tinney <[log in to unmask]> wrote:
>>> =3D20
>>> Hi,
>>> =3D20
>>> Our local repeater club just ordered the new Yaesu System Fusion 
>>> DR1-X=3D=
20=3D
>>=20
>>> repeater.  The mobile Yaesu rig that will do C4FM digital is 
>>> the=3D20 FTM400DR and a voice board is available for that model.  It 
>>> will=3D20 announce your call when you turn it on and will also tell 
>>> you the=3D20 frequency your tuned to, but it will not tell you much 
>>> else.  C4FM=3D20 sounds much better than DStar.  I don't know how it 
>>> compares to DMR, =3D=

>> but=3D20
>>> anything is better than DStar.
>>> =3D20
>>> Bob, K8LR, [log in to unmask]
>>> =3D20
>>>> On 3/4/2015 8:57 AM, Martin G. McCormick wrote:
>>>>   Our club had a really good presentation in February by a couple 
>>>> of members about DMR which is also known in the US as MotoTRBO 
>>>> pronounced MotoTurbo. I strongly suspect it is the new and neat 
>>>> thing in amateur radio but it has a lot of growing up to do yet.
>>>> =3D20
>>>>   Look it up in a Google search and there is a lot of information.
>>>> =3D20
>>>>   DMR is an open-source standard which means anybody can make the 
>>>> gear unlike DSTAR so we will probably eventually see many models.
>>>> =3D20
>>>>   Here's the good and the bad.
>>>> =3D20
>>>>   The best hand-held right now is sold by a company in the United 
>>>> States called Connect Systems. I don't know if that's one or two 
>>>> words. The radios are made in China but to commercial 
>>>> specifications and sell for around $300 a piece to business and 
>>>> public safety agencies. Connect Systems gives hams a really good 
>>>> price break. The guys who gave the presentation say the radios are 
>>>> good and solid like a Motorola. They are UHF only and will do 
>>>> analog FM as well as DMR. I'd love to have one, myself, but read on 
>>>> 'cause here comes the bad news.
>>>> =3D20
>>>>   It's your typical screen toy. There are no voice prompts, no 
>>>> helpful beeps except for one that tells you if you are trying to 
>>>> transmit on an occupied channel, absolutely nothing that makes the 
>>>> radio accessible. There's just a nice strip of glass across the 
>>>> front.
>>>> =3D20
>>>>   The programming software is all Windows, all the time, your 
>>>> typical bundle of lost opportunity.
>>>> =3D20
>>>>   Briefly, here is how DMR works.
>>>> =3D20
>>>>   There are two tears of DMR. One is for simplex-type operation 
>>>> such as what one might encounter in a business of some kind where 
>>>> the staff carry talkies around for tactical communication. The 
>>>> other tear is repeater-type operation.
>>>> =3D20
>>>>   A repeater can handle two simultaneous QSO's and each 
>>>> conversation can have a talk group. Think of the old community 
>>>> repeater systems that used to be common in the commercial world.
>>>> Instead of different CTCSS tones, you have different talk group 
>>>> numbers which is why the loud tone if somebody just transmits, 
>>>> thinking the repeater is free when there is a conversation on their 
>>>> time slot that is on a different talk group.
>>>> =3D20
>>>>   Local systems are connected to the internet, kind of like 
>>>> echolink but when you get a talk group going, you tie up one time 
>>>> slot out of the two available and nobody else can use the system 
>>>> for that slot unless they want to join the talk group.
>>>> =3D20
>>>>   A UHF DMR repeater has one input frequency and one output just 
>>>> like an analog repeater but two users can share the input because 
>>>> their transceivers send packets of audio in bursts at about 20 
>>>> bursts per second but the repeater tells each transceiver when it's 
>>>> turn comes so they both interleave their packets. It's elegant but 
>>>> I can't imagine it on ten or six meters due to the time lag over 
>>>> skip distances. It would foul up the repeater's timing and you'd 
>>>> probably be able to hear the distant signal but your signals would 
>>>> take too long to get back to the repeater which would stray in to 
>>>> the other guy's slot.
>>>> =3D20
>>>>   I saw a lot of neat technology, here, but since there is no Linux 
>>>> support, it's the same old same old.
>>>> =3D20
>>>> =3D09
>>>> Since DMR is an open standard, however, there is more likely to be 
>>>> something useful later as more people will be making equipment.
>>>> =3D20
>>>>   Sorry for the length of this post, but I figured some might find 
>>>> it interesting.
>>>> =3D20
>>>>   By the way, the audio is very good, similar to P25 if you have 
>>>> heard that.
>>>> =3D20
>>>> 73
>>>> Martin WB5agz