We moved a bunch of 100-watt 460/465 MHz MSR-2000 repeaters down to the ham band. By just following the alignment procedure in the service manual, they tuned right up with excellent performance in the ham band - the receivers had better than spec sensitivity, the transmitters put out 100+ watts. No modifications of any kind were necessary. I have one that I tuned up on 440 and kept for myself as a "garage" repeater, but I have more repeaters than hilltops to put them on (and users to use them), so it will probably be going to the 'bay one of these days, along with a spare receiver and exciter.
Larry K7LJ Original Message: ----------------- From: n9wys [EMAIL PROTECTED] Date: Mon, 19 Apr 2004 23:41:48 -0000 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] UHF MSR2000 tuned down to 440 MHz Our repeater is an MSR2000 UHF model, Model # C74GBS3106BT. It was originally at 460 MHz, and we tuned it down to 444.550 / 449.550. Our problem is - we are only getting about .6 µv to .7 µv sensitivity in the receiver, and this is when feeding signal DIRECTLY into the receiver (no duplexer). If I remember, the manual says that nominal sensitivity should be about .2 µv... The tuning coils are bottomed out, so we have no more tuning available with which to improve the receiver..... So, my question is: Does anyone know if there is any different receive boards available, other than the TRNE6262A ? If so, can you advise what the part number would be? I would think that Motorola MUST have made UHF repeaters lower than 450 MHZ, but I can't seem to locate any part numbers for receiver boards for any of those machines. (We called Motorola parts, and this is the part number for the receiver board they say belongs on our machine - of course, it's for 450-470 MHz range, which is what is specified by our model number. They were no help with whether there is any other receiver board available for any other frequency spread. Plus, the TRNE6262A is no longer available, anyway.) Also, my manual is not complete... We have all the sections for the transmitter, but the receiver stuff is all VHF. :-( Otherwise, I guess a modification is in order, and I'm not sure where to look for that. Can anyone point me in the right direction?? I'd be much obliged! Thanks! Mark - N9WYS Yahoo! Groups Links -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ . 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/
