> "k9bf" <k...@...> wrote: > Skipp > I appreciate your reply. I currently have an old > Johnson CR1000 that a converted to the 440 band about > ten years ago. It has worked ok but its time to move on.
Why is it "time to move on"? > I have been offered a remote receive site in the center of > my town of 100,000. It is the top of a building about 230 > feet high so not much feedline to deal with. I already have > a R304 and a T304 hamtronics in a box with an NHRC-micro > controller for the remote site. It will link back on 440.1 MHz. > So what I want to do is replace my Johnson with several more > Hamtronic receivers feeding a LDG voter controlled by an > NHRC-10. If you're not pressed or paying for physical space there's nothing wrong with the EF Johnson equipment if its performance is decent. What you get out of the Hamtronics gear is probably a smaller size. > On the transmit side I want to use a T304 or T306 to feed > two watts into a Vocom 200 watt amplifer. I will be using > an Astron 70 amp power supply and a Motorola duplexer. > The repeater site will have two antennas. One up at about > 200 feet for transmit and receive. Another up about 100 > feet to receive my remote links. I am excited about this > project. Can you give me anymore advice? > thanks > Ben K9BF I can tell you the 200 watt amplifier is going to be a real beast to tame. Especially if you think a 4 cavity Motorola Duplexer is going to be enough protection. I honestly can tell you to first get more realistic with a 35 to maybe 65 watt power level, get the system up and the gremlins worked out first. Then use the high powered amplifier and be able to restore the low power operation back when everything hoses up real bad with the Vocom 200 Watt Amp the first time you try and use it. Don't reach for too much pie or it will probably fall of the shelf on the floor. And there's no good 5-Second Rule for pie on the floor. Start your system out reasonable and then expand from a known good working bench mark. s.
