[Repeater-Builder] Digital repeater sidebands??
Hi folks We have a digital repeater in the 420-430 MHz subband that is being installed shortly on our site. I am concerned about the possible interference to systems in the 440-450Mhz subband on the same site. What experience have you folks had with similar systems and installations? What is the typical sideband levels from commercial digital repeaters at 10MHz+ spacing? FYI this site is owned by our club and we have full control over the installations on it including the commercial customers who lease space on it. I just want to know what to look for when this new system is installed. Burt VE2BMQ
Re: [Repeater-Builder] Digital repeater sidebands??
I just realized that we also have another commercial analog repeater in the 420-430MHz band, so close in sidebands would also be a concern. Burt VE2BMQ Burt Lang wrote: Hi folks We have a digital repeater in the 420-430 MHz subband that is being installed shortly on our site. I am concerned about the possible interference to systems in the 440-450Mhz subband on the same site. What experience have you folks had with similar systems and installations? What is the typical sideband levels from commercial digital repeaters at 10MHz+ spacing? FYI this site is owned by our club and we have full control over the installations on it including the commercial customers who lease space on it. I just want to know what to look for when this new system is installed. Burt VE2BMQ Yahoo! Groups Links
Re: [Repeater-Builder] Digital repeater sidebands??
I guess you say what type of modulation and bandwidth are you using for the new Digital Repeater? Should not be any problem. The digital modulation mask are getting more efficient in the use of the spectrum as channel bandwidth get narrower. The name of the game is to get more spectrum efficiency. Just because you go digital the RF rules of the game should not change. They say Digital modulation is less inclined to discernible interference than analog FM. I have not seen any problems when taking trunked systems from Analog FM to Digital P25. I have several mixed mode systems and again have never seen any inter-modulation issues come up when going to digital mode. In general I think the Digital P25 mode gives much better quality audio over a larger part of the coverage area. Something commercial especially public safety users want. Peter On Sun, Aug 15, 2010 at 10:46 AM, Burt Lang b...@gorum.ca wrote: Hi folks We have a digital repeater in the 420-430 MHz subband that is being installed shortly on our site. I am concerned about the possible interference to systems in the 440-450Mhz subband on the same site. What experience have you folks had with similar systems and installations? What is the typical sideband levels from commercial digital repeaters at 10MHz+ spacing? FYI this site is owned by our club and we have full control over the installations on it including the commercial customers who lease space on it. I just want to know what to look for when this new system is installed. Burt VE2BMQ
