Thanks Nate! Your response and sense of humor is appreciated! Bill
--- In [email protected], "Nate Duehr" <n...@...> wrote: > > > > Answers below. > > > > From: [email protected] [mailto:[email protected]] > On Behalf Of Bill Powell > Sent: Wednesday, March 25, 2009 12:11 AM > To: [email protected] > Subject: [DSTAR_DIGITAL] Re: Coordinating DD mode "repeaters" > > > > Scott and Group, > > As VP Coordination for the ARCC I have been asked by a number of our users > to consider establishing a STRICTLY VOLUNTARY coordination program for DD > and other digital "non-repeater" modes. > > > > All coordination is "voluntary", Bill. :-) > > > - Can a DD channel be shared in the same manner as an AX.25 system? > > Likely to degrade rapidly. Proper use of callsigns by users would make it > technically POSSIBLE, but problematic. Until 1.2 GHz is "full" it's > probably better to spread them out. > > > - Does DD perform CMSA or is it a "blind" system? > > If it's like other D-STAR implementations by Icom, it can only "hear" > D-STAR. So it would probably not transmit if other D-STAR signals are > present, but would jump right on top of an analog or other signal "sharing" > the frequency. Ultimately someone would have to go test this, or get an > answer from Icom on it. > > > - Does DD operate on a single channel or can it be operated on a "split" > (pair) of channels? How is it "normally" used? > > Single channel. Very wide. > > > - What is the definition of "interference" in a DD system? > > The same as any system, something that keeps communications from occurring! > (GRIN) > > > - What is the result of "interference"? > > Packet loss. The system behaves like a wireless access point, if that > helps. > > > - What level of interference is "tolerable" > > Personally I find the whole system would be mathematically too slow to use > beyond 5 local users anyway at 128 Kb/s -- so my personal opinion would be > "any interference" would render the system even slower, and "unusable" in > most cases. > > > - What is the "true" (measured) receiver sensitivity for a DD central > station and at what BER? > > Good luck getting this from the manufacturer, let alone the Amateurs that > own the systems. > > Nate WY0X > > > > [Non-text portions of this message have been removed] >
