I agree with Ken. On an 800 Mhz system I maintain, 100 watts into the combiner yields about 16 watts at the antenna. This is a 10 channel combiner with 250khz spacing and 320 ft of 1 5/8 Heliax. We have actually installed a second antenna and feedline and have plans to split the combiner but just haven't gotten around to it yet. Kinda sucks but there's always a warm spot in the room in the winter.
Jamey Wright Systems Analyst/EDACS Administrator Morgan County EMCD 911 Decatur, AL 256-552-0911 > -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Ken Arck > Sent: Thursday, February 21, 2008 10:51 AM > To: [email protected] > Subject: Re: [Repeater-Builder] Two Repeaters, One Antenna > > At 08:43 AM 2/21/2008, you wrote: > > >It can be done. I used to work with a UHF commercial system which > >combined multiple repeaters to a common antenna. The cans were built > >& tuned by TxRx; rather expensive in terms of money and insertion loss. > > > <-----One comment for what it's worth. Transmitter combiners are > generally quite lossy. And that loss can increase to prohibitive > amounts the closer in frequency adjacent ports are. > > In other words, there is a point of diminishing returns IMHO > > Ken > -------------------------------------------------------------------------- > ---- > President and CTO - Arcom Communications > Makers of repeater controllers and accessories. > http://www.arcomcontrollers.com/ > Authorized Dealers for Kenwood and Telewave and > we offer complete repeater packages! > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > "We don't just make 'em. We use 'em!" > > > > > > > Yahoo! Groups Links > > >
