Re: Replacing a VHF MSR-2000 PA 30w with the 100w version Hello Francois,
The PA connections should be the same or similar number and type although on the 30 watt PA the DC Power leads might be in a different location versus the 100 watt PA, and then keep in mind there are at least two versions of the 100 (aka 110) watt RF Amplifiers. The 30 watt and Intermittent Duty Cycle 100 (aka 110) Watt Power Amplifiers should be in the same type of chassis (they "should" look the same regardless of what is inside). The coax feeds appear on the front of the mounted amplifier, one on each side. Large DC black and red wires are routed to a terminal block on the front and all the control logic (keyed voltage) is routed through a rear mounted white plastic plug/jack assembly (of which I've seen and have two versions). The 100/110 watt continuous duty RF Power Amplifier looks a lot like an older Micor Repeater Power Amplifier, only painted black. The connections are similar, but in different places and the control jack/plug assembly is not used. I believe one wire is routed up from the back plane control shelf to provide switched (turn on) logic) to the Amplifier. So the wires and connections may need to be moved or extended depending on how you choose to mount the replacement upgrade amplifier chassis. In some cases it may be easier to make up new cables. Be careful replacing the exciter cable, if you are able to safely reuse the special Exciter end RCA plug it would be a great idea to make sure it or a same type plug is used. And of course use good quality coax like the type you see installed and used on the original equipment. cheers, skipp > "va2rc_2000" <va2rc_2...@...> wrote: > Hello to all, we are using In Quebec City a VHF MSR2000 > 30 watts repeater. > We are planning to install a new PA 100 watts. > One question we have, on the 30w version there is cable > going from the PA to the Exciter. On the PA 100w version, > this cable does not exist, so the Exciter does not receive > the current from the PA and we have no output. > Can somebody help with this issue ? > Thank you > Francois VA2RC
