[HATS] DUPLEXER HELP NEEDED.

[YZ7REA/45AT142 Vladimir]

	Hello all,
		 My name is Vladimir and I'm from Novi Sad, Yugoslavia.
I hope that you can help me with my problem. To cut the long story 
short, I'm building a 1.2 GHz ATV (Amateur Television) repeater. The 
repeater will operate on 1240 MHz which will be the INPUT (receive)
frequency and 1280 MHz, which will be OUTPUT (transmit) frequency. I'm 
planning to use a single antenna on both frequencies, because there's
room only for a single omidirectional antenna on the mast. That's where
my problem starts. I need an antenna duplexer. I've searched the 
Internet, discussion groups, forums, ftp's and all I have found was 
HIGH QUALITY, PROFESSIONAL and VERY, VERY EXPENSIVE antenna duplexers 
for police, military etc. The price ranges were from 790-3000 $ US!!! 
All those duplexers were of fine quality , but designed to withstand 
transmitters with 50-100W RF power. I need a cheaper duplexer capable 
of good IN/OUT frequency separation (approx. 40-60 dB), small insertion
loss (up to 1 dB) and PASSBAND return power loss of approx. 17-20 dB. 
I'm planning to use a 1W transmitter for the time being, but maybe some
day I'll "upgrade" to 20W. So the duplexer would have withstand a 
MAXIMUM output power of 20W. Can you help me find a good DUPLEXER 
CAVITY design for small RF input such as mine?

						YZ7REA Vladimir

	   ***MERRY CHRISTMAS & HAPPY NEW YEAR 2000***

-- Binary/unsupported file stripped by Listar --
-- Type: text/x-vcard
-- File: atomski.vcf
-- Desc: Card for YZ7REA/45AT142 Vladimir


---
Send e-mail to 'listar@stevens.com' with subject:

  'unsubscribe hats'  to unsubscribe from this list
  'subscribe hats'    to subscribe from this list
  'help'              for more information