You are experiencing a very common problem- a repeater that is unbalanced, meaning that its "mouth" is far more effective than its "ears." A repeater's coverage area is primarily determined by how well it receives stations in the field, not by how much transmitter power it has. Maybe that sentence should be in capital letters. Ironically, increasing the transmitter power will sometimes reduce the coverage, simply because there is more receiver desense occurring.
The Radius M120 does not have a stellar receiver, so you might try making the CDM1250 your receiver and the M120 your transmitter. The CDM radio has far better shielding than the M120. Use a service monitor to determine how much desense you have. One simple method is to disable the transmitter and generate a test signal over the air (not into the receiver itself) that gives you 12 dB SINAD at the repeater's receiver. Then enable your transmitter. If the received signal deteriorates at all, you've got desense. Once you correct the desense, look at ways to reduce the attenuation of the incoming signal. Besides having a good antenna, properly positioned, your feedline should (my Rule of Thumb) have no more than 1.0 dB of attenuation at the receive frequency between the antenna and the duplexer. In other words, 200 feet of RG-213 is not a good choice. Please elaborate on the details of your repeater installation. What make and model antenna do you have, and what is its height AGL and AAT? What kind of feedline, and how long is it? Make and model of the duplexer? What kind of cable is used for jumpers in the cabinet? 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of ntoda96818 Sent: Sunday, January 06, 2008 12:47 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Repeater TX/RX Problems Hi... currently I am running a Radius M120 RX and CDM1250 TX in my repeater unit. I was wondering what I could do to increase my repeater's RX range. It seems that my portables talking to the repeater will RX on their end further then they can TX to the repeater. Is this a norm or do I need to get an add-on equipment of some sort to equal the repeater's RX/TX distance?
