Have a read of Andy, G4SZM's work here: <http://www.gb3we.com/gb3we/pages/>
The pictures page shows you the modifications to make an analogue repeater work on D-Star. <http://www.gb3we.com/gb3we/pages/> There are a couple over in Ireland using this info to good effect. :) Neil. G7EBY. --- In [email protected], "John D. Hays" <j...@...> wrote: > > Adam, > > A good question. > > The reason it will not generally work is that analog voice repeaters > have a variety of filters and audio amplifiers that are designed to > emphasize the human voice. These same filters and audio amplifiers > distort the GMSK signal of D-STAR to an extent that it cannot be decoded > on the repeater output. A repeater can be designed to pass the signal > through "flat", that is no modification of the audio, and it may pass > GMSK just fine at that point (it may take a lot of tweaking and/or an > inversion in the signal) as well as analog voice. This is usually > accomplished by tapping the repeater's receiver discriminator and > routing it directly to the repeater's transmitter modulator. And, yes, > it would be very irritating to the analog FM users, and if they didn't > know what was going on, they may key right over the D-STAR signal, > disrupting the DV conversation. > > Adam Karsin wrote: > > > > > > Ok with all the talk of interfacing DV and FM, here is another > > question.... > > if there is an FM repeater, that has no tone whatsoever, what is it about > > Dstar that it wont pass through? > > I know all the obvious like it ticking off all the FM repeater users, > > and so > > on... but lets say that I have a 2M FM repeater (I don't but work with me) > > on 147.000 + CSQ. I know that if I set me radio to that frequency and > > offset > > in FM it works. Simple enough, we have used these for years. Now, my buddy > > and I on our HT's very simply toggle into DV mode, why would this not work > > the same? I know anyone not using dstar would only hear static, but > > that for > > the purpose of this question is not important. (lets call it a private > > mobile repeater) so there is no one else on. > > > > Just a question, don't drag me before the firing squad!! > > > > Adam > > KG4WWH > > > > _ > > > -- > John D. Hays > Amateur Radio Station K7VE <http://k7ve.org> > PO Box 1223 > Edmonds, WA 98020-1223 > VOIP/SIP: j...@... <sip:j...@...> > Email: j...@... <mailto:j...@...> > > > [Non-text portions of this message have been removed] >
