Nate, what type of coverage are you getting in the Denver area for 1.2 data and voice? How well does the building penetration compare to 440MHz FM voice rptrs up on the mountain?
John/N4SJW --- In [email protected], Nate Duehr <[EMAIL PROTECTED]> wrote: > > johnmichaelwelton wrote: > > Any recommendations for a 1.2GHz antenna to be used in a DSTAR DD/DV > > application at a commercial site (hospital)? > > > > John/N4SJW > > Charleston, SC > > For a repeater or base station (ID-1)? > > The options are somewhat limited out there. Sadly it seems the > Comet/Diamond type antennas are some that a lot of people are using, and > commercial quality options are few. > > For our repeater, which is on a mountain on the West side of the city, > we used a custom-built 120 degree panel reflector. > > Sending the extra RF of an omnidirectional antenna back into the > mountains, turned out to be a problem for our analog 1.2 machine years > ago, so we avoided it and went straight to something with some gain > toward town on the D-STAR system. > > DV (voice) on D-STAR 1.2 acts similar to any other analog 1.2 GHz > repeater. DD (high speed data) being 100 KHz wide, requires more gain > to go the same distance. > > Gain antennas are often necessary for good links on DD... a 10W radio, > 100 KHz wide, isn't much signal left to work with a the far end. > > There is at least one ham running around saying he's bumped his ID- 1 to > 20W with no ill effects by finding the power setting pot inside and > cranking it wide open. Not sure I'd do that, but just relaying the > info. I'd want to look at it on a spectrum analyzer and also keep a > very close eye on it for heat load if I were going to mess with the > power setting in the rig. But his reports are that his ID-1 is > surviving the abuse, just fine so far. > > > Nate WY0X >
