There isn't going to be much warning before that RF output module self-destructs. When he has to foot the bill for a new RF module (or even transistors), even if he replaces it/them himself, I'll bet that power set pot will be glued in place at 10 watts. Just hope he isn't too long-winded. Tom
--- 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 >
