Re: [Repeater-Builder] Re: Multiple receivers one antenna ???

2005-12-19 Thread Roger Grady
At 12:29 PM 12/19/2005, Coy Hilton wrote: It may sound interesting (and cheap) but the reason that no one else has suggested it is because the impedance miss matches it causes. That is why you need something like a multicoupler whis is first a pre amp to keep the loss to a minimum then sends the

RE: [Repeater-Builder] Re: Multiple receivers one antenna ???

2005-12-19 Thread Jeff DePolo WN3A
It's called a Wilkinson splitter. Here is a link to some of the theory. I don't think it's fair to call it a Wilkinson without a resistor across the output ports. A real Wilkinson provides port-to-port isolation due to the addition of the resistor. A tee and 75 ohm cables doesn't provide

RE: [Repeater-Builder] Re: Multiple receivers one antenna ???

2005-12-19 Thread Jeff DePolo WN3A
You can handle the impedance matching by using 1/4 wave sections of 75 ohm coax between the receiver input and the T. The 1/4 wave 75 ohm section steps the 50 ohm receiver input impedance up to 100 at the other end, two of those in parallel at the T gets you back to 50 to match the