My DSTAR repeater has 3 inputs, and 3 outputs. In 70 cm it transmits on 442.000 and receives on 447.000. On 23 cm it transmits on 1292.1000 and receives on 1272.1000, and the high speed simplex data port operates on 1253.0000. Since like many programmable repeaters, I am not locked into a 5 mHz offset, I can use a 3 mHz split, or a 4.5 mHz split, or pretty much any 2 frequencies in the 70 cm band that I choose, like wise, in 23 cm digital voice, there is an input and output. Our Texas VHF FM coordinator recommended a 20 Mhz split, but I could just as easily used a 12 mHz split, or 15 mHz split, or what ever pair of frequencies I want. The HS DATA is simplex, but I believe I could have a different send and receive frequency but have never explored this facet - today I am using 1253.0000.
I cannot imagine the 70 cm DSTAR repeater not having a transmit frequency programmed in, thus making it just a receiver in 70 cm, or just using the 1272.1000 receiver without also using the 1292.1000 transmitter. I don't even know what would happen if I left the transmit frequency blank when programming - I suspect there is a default number that would go into the synthesizer. When I send on 447.000 the repeater repeats on 442.000, regardless of any other setting. When I send on 1272.1000 the repeater repeats my transmission on 1292.1000 and when I connect to the internet this takes place on 1253.0000 with a 50 ms turn around time. I cannot send on 447.0000 without being repeated on 442.000 unless I choose a different transmit frequency. I don't know what would happen if I left the 442.000 transmit field blank. I don't know of anyone who has done this or any reason why anyone would have a repeater without haviing their transmitter functional. I can not send on 447.0000 without my transmission being repeated on 442.0000 regardless of whether I choose to cross band to 1292.1000 also, or choose to make a gateway call to London, I am still repeated on 442.0000. This is kinda like one of my first 2M repeaters that had a 10 Meter simplex drop that I could activate with touch tones, and I could also cross to my 6Meter repeater with touch tone commands if I wanted. It was still a 2M repeater. There is no reason you can't refer to these 2 repeaters and one simplex high speed data box as multiple inputs and outputs, but they are not independent of one another. They are 2 repeaters and a simplex data box (for lack of a better description). When I first installed the DSTAR system May the 5th, It consisted of 2 GE Phoenix radios, one transmit radio on 442.000 and one receive radion on 447.000 with some creative interfacing to repeat the DSTAR signal. About 2 weeks later, the Icom 440 repeater and controller arrived and we changed out the GEs for the Icom. Function was the same, except it now would ID in DSTAR properly. Next we connected to the internet to enjoy the gateway features, and next a few weeks ago we added a 23 cm digital voice repeater and a 23 cm high speed data repeater *loose term repeater because it uses one frequency, 1253.0000*. Maybe there is someone out there that does not use a DSTAR repeater as a repeater - I have never heard of this but there are many things I do not know. Best 73 and also KUDOs to the hard working unpaid volunteer frequency coordinators who do their split level best to make jello stick to the wall while they are trying to push wet spaghetti in a straight line uphill on a slippery slope at the same time while swatting at gnats buzzing at their sweaty faces. (No sarcasm meant - I really do appreciate the work these folks do) Steve NU5D . >> >> >>> Bottom line guys & gals, The D-Star units have two frequencies one for >>> Transmit and one for Receive >>> >> Incorrect. Most D-Star systems have multiple inputs & outputs & are >> networked via radio & internet to other D-Star systems around the world. >> >> > > > But a 2-meter D-Star repeater has ONE input frequency and ONE output > frequency, and does NOT transmit point-to-point communications on that > output frequency! What the rest of the SYSTEM has, or does, is irrelevant: > if that 2-meter transmitter is not transmitting point-to-point > communications, it is NOT in auxiliary operation. You are continuing to > ignore the key requirement for auxiliary operation on any given frequency, > that point-to-point communications are actually TRANSMITTED over that > frequency. > > > > > > >
