George, With the upsurge in FRS equipment this might be a worthwhile modification. Since the standard GMRS channels are 25K spaced and the FRS channels are dropped in between both the inputs and the outputs it is possible that a standard 25K rx will receive portions of the audio from adjacent FRS channels. Using narrower filters will cut down on reception of the adjacent channels. There is however a gotcha...other 25K users. The exact action the filters will have is hard to describe. The wider deviation users might sound more distorted, they will sound louder, and weaker wider bandwidth signals may not be heard. If you have "control" of the other transceivers that you will be communicating with, you can turn down the TX deviation to 3KHz which will easilly pass thru a narrowband filter.
Good luck Milt N3LTQ ----- Original Message ----- From: "George Henry" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, February 27, 2007 9:36 AM Subject: Re: [Repeater-Builder] Narrowbanding > -----Original Message----- >>From: George Henry <[EMAIL PROTECTED]> >>Sent: Feb 26, 2007 11:09 PM >>To: [email protected] >>Subject: Re: [Repeater-Builder] Narrowbanding >> > > [snip] > >>Just wondering if it was worth doing or not, particulary for a GMRS >>repeater >>& the potential for FRS interference. >> >> > > DOH!! > > No sooner did I shut the computer down and crawl into bed, than I realized > I was thinking "upside-down" - the FRS channels are between the repeater > OUTPUTS, not the inputs! (Must be that NorCal vs. SoCal repeater thread > that got me confused) So anyway, in a high RF environment like > Chicagoland, is it worth doing? I'm probably 30 miles from the next > nearest GMRS repeater, and the user base seems to be pretty localized. > > George, KA3HSW / WQGJ413 > > > > > > Yahoo! Groups Links > > >
