how about lower power , better hard line and a more gain DB antenna.
----- Original Message ----- From: "kf0m" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Wednesday, November 03, 2004 11:50 PM Subject: RE: [Repeater-Builder] Solid State VHF PAs (200+ watts of power) > > Here is the situation with the repeater I maintain that runs 300W on TX. > Repeater antennas are at 1300 ft feed through 3/4 in 75 ohm line. The > majority of the user base is 40 to 60 miles from the site. We have a > remote > input about 60 miles from the repeater to provide HT and mobile coverage > for where the majority of the users are. With all the feedline loss and > the > distance from the users, we need the 300W Tx power to provide good > coverage > where the users are. > > The repeater is also the primary skywarn repeater with wide area coverage > of > the state and users need to be able to hear the repeater well in adverse > weather conditions. > > With 300W, I can hear the repeater from my house which is 50 miles from > the > repeater and I can get into it on the HT with the rubber duck using 200 mw > through the remote receiver. With the repeater running 100W for TX, I can > get into the repeater using the HT but can't hear it on the rubber duck. > > John Lock KF0M > Wichita KS > kf0m at arrl dot net > >> -----Original Message----- >> From: Kevin Custer [mailto:[EMAIL PROTECTED] >> Sent: Wednesday, November 03, 2004 8:09 AM >> To: Repeater-Builder@yahoogroups.com >> Subject: Re: [Repeater-Builder] Solid State VHF PAs (200+ watts of >> power) >> >> >> >> RE: Excessive power. >> >> Neil McKie wrote: >> >> >I can only wonder why the need for what seems to me is excessive power? >> > >> >> Most folks will agree that a repeater that is working properly (no >> desense) having a receiver sensitivity of .35 uV (- 116 dBm) for 12 dB >> SINAD, and a transmitter power of 110 watts will likely be fairly well >> matched in receive/transmit coverage considering a modern 50 watt mobile >> rig. >> >> Now, lets add a receiver preamp on the repeater and increase its >> sensitivity by say 6 dB to -122 dBm. Considering the repeater still >> operates properly, without desense, this same repeater would now require >> 480 watts of transmitter power to be matched as above. >> >> That being said, 200 + watts of transmitter power doesn't seem to be >> excessive to me, but it depends on what is there to hear the user. >> >> Kevin Custer >> >> >> >> >> >> >> Yahoo! Groups Links >> >> >> >> >> >> >> > > > > > > > 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/
