[DSTAR_DIGITAL] Re: more DV / FM questions

Very good article - should be required reading for folks wanting some depth without fear of drowning. Thanks for sharing de nu5d. > I wrote an article for CQ VHF magazine (Winter 2009 issue) that > describes how GMSK works in D-STAR, without going too deep into the details. > I put a pd

[DSTAR_DIGITAL] Re: more DV / FM questions

In a message dated Fri Jul 3, 2009 10:16 am ((PDT)), "john_ke5c" k...@hot.rr.com john_ke5cwrites: Andy then is almost certainly transmitting "plain" FM, not GMSK-FM. This will work RF-wise moderatly well and is what NU5D did before he had an ICOM stack. The bandwidth will be somewhat g

RE: [DSTAR_DIGITAL] Re: more DV / FM questions

Bob K0NR wrote: > I wrote an article for CQ VHF magazine (Winter 2009 issue) that > describes how GMSK works in D-STAR, without going too deep into > the details. > > I put a pdf version of it out on my web site, if anyone is > interested in reading it. > > http://www.k0nr.com/Files/CQ%20VHF%20A

[DSTAR_DIGITAL] Re: more DV / FM questions

So, in a nutshell, we are modifying an FM RTX by removing the analogue audio shaping and letting the AMBE chip do all the work each way. To be honest, SZM's boxes sound totally different on analogue FM than the Icom ones. It sounds more like a TRBO carrier than a D-Star one from experiance. I w

Re: [DSTAR_DIGITAL] Re: more DV / FM questions

Woodrick, Ed wrote: > Saying D-STAR IS plain FM is even worse than calling PM, FM. There's a > difference, a very big difference. FM=Frequency Modulation. D-STAR <> > Frequency Modulated, no way, no how. > > Can a FM transmitter send a GMSK signal? Well, a FM transmitter can be > modified to do

RE: [DSTAR_DIGITAL] Re: more DV / FM questions

r alternatives are so much better, then why isn't someone making a lot of money on them? Ed WA4YIH From: dstar_digital@yahoogroups.com [mailto:dstar_digi...@yahoogroups.com] On Behalf Of Neil Sent: Friday, July 03, 2009 2:29 PM To: dstar_digital@yahoogroups.com Subject: [DSTAR_DIGITAL] Re:

Re: [DSTAR_DIGITAL] Re: more DV / FM questions

- Original Message - From: "Neil" To: "dstar digital" Sent: Friday, July 3, 2009 3:23:31 PM GMT -08:00 US/Canada Pacific Subject: [DSTAR_DIGITAL] Re: more DV / FM questions Strange, we are almost out of 2M allocations here. (FM or DV.) One of

Re: [DSTAR_DIGITAL] Re: more DV / FM questions

At 08:23 AM 7/4/2009, you wrote: >Strange, we are almost out of 2M allocations here. (FM or DV.) We're out on FM here, DV works, because it can be squeezed in between FM channels (we use 25 kHz spacing on FM here), provided you keep the adjacent FM/DV channels geographically spaced apart. 73 de

[DSTAR_DIGITAL] Re: more DV / FM questions

Strange, we are almost out of 2M allocations here. (FM or DV.) --- In dstar_digital@yahoogroups.com, Tony Langdon wrote: > > At 12:58 AM 7/4/2009, you wrote: > > >Its a shame your TX is what it is, maybe a redundant FM TX rig would > >suffice instead? (And be a quick fix.) > > True, but the T

Re: [DSTAR_DIGITAL] Re: more DV / FM questions

At 12:58 AM 7/4/2009, you wrote: >Its a shame your TX is what it is, maybe a redundant FM TX rig would >suffice instead? (And be a quick fix.) True, but the Tx I have is an old repeater workhorse, with a proven track record, and it came at a good price! :) If I put up something on D-STAR, I

RES: [DSTAR_DIGITAL] Re: more DV / FM questions

pass through. But we have to turn the CTCSS off and no tail at all. De: dstar_digital@yahoogroups.com [mailto:dstar_digi...@yahoogroups.com] Em nome de john_ke5c Enviada em: Friday, July 03, 2009 2:16 PM Para: dstar_digital@yahoogroups.com Assunto: [DSTAR_DIGITAL] Re: more DV / FM ques

[DSTAR_DIGITAL] Re: more DV / FM questions

Hi John, Well, D-Star IS plain FM, you buy an FM transceiver and the add on board just utilises that for the GMSK data, like packet or any other data mode for that matter. Yes, I agree that the bandwidth is full scale all the time, but measure it on a scope and see that the GMSK data is the sa

[DSTAR_DIGITAL] Re: more DV / FM questions

> As far as I can see or know, Andy's repeater doesn't buffer or 'hold' any > data, it is purely passed directly and almost instantaneously into the TX > from the RX, after the comparator circuit that helps smooth off the 0's and > 1's. Andy then is almost certainly transmitting "plain" FM, not

[DSTAR_DIGITAL] Re: more DV / FM questions

Hi Steve, Trust you are well. I think the threads where people were connecting a D-Star radio to an analogue radio or repeater (or visa versa) have been discussed before and been met with quite a wall of opposition when they tried. Its a shame someone wouldn't come up with a 'caller ID' type s

Re: [DSTAR_DIGITAL] Re: more DV / FM questions

Looks like the thread is migrating from connecting a DSTAR radio to an FM radio or repeater, into building a non-Icom DSTAR repeater. It doesn't take much 'magic' to run dstar through a PMR or LMR here in the Colonies, radio. BUT, You loose the DSTAR ID packets and such generated by the repeat

[DSTAR_DIGITAL] Re: more DV / FM questions

Hi Tony, I spoke to Andy SZM earlier, he was quite pleased that others were interested in modifying PMR gear, and that the fact that an Icom D-Star box is just two FM trancievers in a shiny case, obviously with no analogue whatsoever available on them to the end user is just that. GMSK can be b

Re: [DSTAR_DIGITAL] Re: more DV / FM questions

At 04:04 PM 7/3/2009, you wrote: >Have a read of Andy, G4SZM's work here: > > > >The pictures page shows you the modifications to make an analogue >repeater work on D-Star. > > >There are a couple over in Ireland using this info

[DSTAR_DIGITAL] Re: more DV / FM questions

Have a read of Andy, G4SZM's work here: The pictures page shows you the modifications to make an analogue repeater work on D-Star. There are a couple over in Ireland using this info to good effect. :) Neil. G7EBY. --- In