On Sat, 16 Feb 2008, Laryn Lohman wrote: KK> You can use a wire-line tone remote if you're fortunate enough to KK> have a copper loop up to the repeater site from a control site. > If I could clarify that statement, wireline in this case can mean a > dialup phone line, internet connection, etc., even if brought to the > site via wi-fi. Point is, it doesn't have to be a "copper loop" to be > defined as a wireline.
It's possible, but the method I'm suggesting doesn't cope well over RF without some serious hacking: http://www.telex.com/UserFiles/Downloads/radiodispatch/223C_Manual.pdf I would shy away from using WiFi for control, however. It is half-duplex and may have quite a bit of packet loss. I would strongly recommend using a 222MHz or 430-440MHz reciever for a control link. KK> You can also build a -3dB Wilkenson splitter and feed both recievers KK> from the RX duplexer output. > Yup that will work. (I'm using TV-type splitters with good > results-horrors!). Especially if you are using a preamp. Split at > the output of it to both receivers. You will need to take into > account the loss of the duplexer rx side at the aux frequency... You're going to see about -3.8dB of loss using a "standard" splitter, regardless of type. You may see more loss using a broadband 75-ohm splitter, however you can compensate the loss out of the system by re-engineering the splitter (should you choose to build one) or simply by retuning the duplexers with a 75-ohm load on the RX port, or using a 50-ohm to 75-ohm transformer (which can be made out of a coax section). The real crux of this is that you have to be certain that your receievers really are matched at 50-ohms. Sometimes they don't present a 50-ohm load. It would also be an exceptionally good idea to look at the recieve antenna port through a spectrum analyzer to be certain that you don't have any strong nearby carriers that would cause a preamp after the duplexer to go into compression or limiting. Your users aren't going to notice the difference unless there's at least -6dB of difference between before and after, so the change only affects fringe area users, and possibly HT users. I would skip the preamp. -- Kris Kirby, KE4AHR <[EMAIL PROTECTED]> But remember, with no superpowers comes no responsibility. --rly
