RE: [Repeater-Builder] Re: Uniden ARU251 Repeater
Johnny, The transmit crystal in your repeater is supposed to operate at a regulated temperature of about 176 degrees Fahrenheit, or about 80 degrees Celsius. The crystal should be ordered for operation at that temperature. If the radio shop technician disconnected the heater resistor but installed the correct (oven-rated) crystal, it will be *way* off frequency. The heated TX crystal is mandatory, in order to achieve the +/- 2.5 PPM stability specified by Uniden. Note that the receive crystal has a heater that kicks in only when the ambient temperature falls below about 14 degrees F. The TX crystal heater is a 47-ohm 2 watt resistor. Once it is installed and working correctly, wait at least five minutes after turning on the radio before attempting to tune the TX frequency. I'd let it settle for a half-hour or more. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of bama_guy1965 Sent: Sunday, May 07, 2006 2:46 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Uniden ARU251 Repeater ---well I checked the crystal htr and I suspected he d/c the thing and I have no idea where to reinstall it. I didn't see anything on the diagram where you can do it, but I have a manual here I will find in min but I bet that's the reason why my transmit is drifting off. Johnny 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/
Re: [Repeater-Builder] Re: Uniden ARU251 Repeater
Setting the transmit freq on an Aru251 is a process. Once you power it up , it takes about an hour for the crystal oven to really stabilize. After each adjustment , key it a few times and let it set for a few minutes. Johnny bama_guy1965 wrote: > well in response I put the wrong frequency it is 462.550 that it > should be output but it is 5kc off at 462.5456 if that makes any > difference I know its driving me nuts and I keyed it off the > repeater itself to get a true reading anymore suggestions would be > appreciated--- In Repeater-Builder@yahoogroups.com, "Steve Bosshard > (NU5D)" <[EMAIL PROTECTED]> wrote: > >>Two things come to mind. First, it could be counting a spur - > > this might > >>get past a notch duplexer - How is performance - if there is much > > power in a > >>spur it should be working pretty poorly. >> >>Second, are you using a talkie to key the repeater - combination > > of two > >>signals might cause the counter to go nuts. >> >>The key would be if the performance is really poor. >> >>gl, steve nu5d >> >> >>5/6/06, bama_guy1965 <[EMAIL PROTECTED]> wrote: >> >>>Im having trouble getting my repeater to stay on frequency I was >>>wondering if it may be the crystal or has the duplexer been tuned >>>wrong it was professionally done supposedly the frequency is > > 462.550 > >>>and it shows up on freq counter as 465.5456 can somebody offer > > any > >>> >>> >>> >> >> >>-- >>Ham Radio Spoken Here.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/
Re: [Repeater-Builder] Re: Uniden ARU251 Repeater
Yeah, 5 kc off will make it sound kinda funky, and I don't have GMRS rules in front of me but may also be out of legal tolerance. If you are sure your counter is accurate (ck against a know to to correct source), then set the trimmer in the TX module, or see if the shop that tuned it up for you will help - pretty minor thing. If you have new crystals, there may also be a drift problem with the crystals, also, the receive may be off as well. ssb On 5/7/06, bama_guy1965 <[EMAIL PROTECTED]> wrote: well in response I put the wrong frequency it is 462.550 that itshould be output but it is 5kc off at 462.5456 if that makes anydifference I know its driving me nuts and I keyed it off therepeater itself to get a true reading anymore suggestions would be -- Ham Radio Spoken Here.NU5D YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
