Commmshop reports that with these tx and RX freqa, power at 100 Watts, Receiver 12dB Sinad point .2uV :
Duplexer or cavity will require 51.9 dB isolation to not degrade RX sensitivity Antennas separated 26 feet vertically of 314 feet horizontally will provide the required isolation. This will depend on antenna, tower, terrain, buildings, feed-lines, etc. MUCH NEEDED Disclaimer: Use the above for rough planning. Obtain the services of a professional for site survey and implementation. The above info merely provided to give a starting point and is not to be considered accurate for every installation. -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Nate Duehr Sent: Friday, February 17, 2006 6:09 PM To: [email protected] Subject: Re: [Repeater-Builder] VHF Seperation [EMAIL PROTECTED] wrote: > Could anyone give me some advice regarding antenna seperation for a > VHF > Repeater... Using TX of 152.000 and RX of 159.000, what would the min. > vertical and horizontal be? For what power level? Need to know your power level to know how many dB of separation you need. If you have the right duplexer on the thing, you don't need separate antennas. Etc. Etc. Etc. Your message is far too vague to help you much, and theoretical numbers never match the real world. Nate WY0X p.s. And my standard disclaimer applies when I see commercial frequencies in any posting on Repeater Builder: Don't trust an Internet mailing list if that system is involved in Public Safety. Hire a professional RF engineer. Mailing lists aren't the right place to be asking (unless you're just using it as a general reference and you already have an engineer) commercial RF design questions. Amateur? Sure. Commercial? Nope. Opinion? Yeah. Facts? Hire someone local who knows the other aspects of your site, can handle designing for things like intermod, site noise floor, and all the other variables you didn't share. Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
