Thanks Steve REAL GOOD Information... TOMMIE --- TOMMIE EchoLink Coordinator for CTSSG "CENTRAL TEXAS STORM SPOTTERS GROUP" ( CTSSG ) WEEKLY CHECK IN ON THURSDAY 7PM CST (SEE BELOW) ECHOLINK NODE# 28821 (KC5YVU-R), and the " WX_TALK " Conference Lampasas Skywarn Freq: 145.330- 162.2T / 444.875+ 88.5T KC5YVU Temple Tx., Freq: 146.720- 88.5T, NU5D Steve, Linked to Lampasas Lampasas Local Freq: 147.220+ 88.5T, KB5SXV Harold " NOTE " Non-Hams Listen in on ICQ # 166128088 http://groups.yahoo.com/group/CenTexStormSpotters/join
----- Original Message ----- From: "Steve Bosshard (NU5D)" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Friday, December 24, 2004 6:07 PM Subject: RE: [Repeater-Builder] Help: GE M2 PL decode dropout on voice peaks and IDA control shelf > > Our Temple Texas ARC owns an Ericsson M3 2M repeater with 3 remote site > voting receivers using GE Phoenix mobiles for 438 Mhz voting receiver link > radios. We had lots of trouble with cheap ham radios chopping on voice > peaks for several reasons. > > Ericsson's philosophy is to use Channel Guard to prevent unwanted signals > from activating the repeater. They use dsp in the system module to decode > the Channel Guard tone. Ham talkies and mobiles chopped pretty badly. > Commercial radios did not. > > I found first of all that most off the shelf talkies, Icom W32, Yaesu, etc > generally had peak deviation set at +/- 6.5 Khz using voice modulation and > either my HP8921 or COM 120B to measure. Another generalization, ham > equipment uses tone and digital coded squelch as an after thought. No > voice > band filters the remove voice components below 300 hz. From the modulator > causing the voice modulation low frequency components to compete with > Channel Guard tones. Add to this a little excessive transmitter deviation > and the system chops. > > Ericsson TAC provided a software patch that "AND" ed tone and carrier > squelch so that once tone was detected it could drop and as long as > carrier > squelch was open the repeater would remain open. This patch cured the > problem, except on the Phoenix voting receivers. > > I also find that Kenwood, TKR720's and 750's are much more tolerant of > crappy signals. > > While on my soap box, The Texas VHF FM Society, coordinator for repeaters > in > Texas recommends a maximum instantaneous peak transmitter deviation of +/- > 4.0 Khz. Proper mic input gain and peak deviation limiting goes a long > way > toward helping choppy signals. > > Mic Gain and Transmitter deviation are loosely related that in setting up > a > transmitter, turn the mic gain to max, and set the deviation limiter to > say > 4.0 Khz. Then reduce the mic gain to taste. Helper used to produce an > instrument to measure mic gain, called modulation density - never did > catch > on. > > Anyhow, my two cents. Best 73 and Merry Christmas to all, > > Steve > NU5D > > > -----Original Message----- > From: Jeff Otterson [mailto:[EMAIL PROTECTED] > Sent: Friday, December 24, 2004 3:22 PM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Help: GE M2 PL decode dropout on voice > peaks > and IDA control shelf > > > Most likely, your HT is part or all of the problem. > > [Steve Bosshard (NU5D)] > > > > > > > > > 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/
