Skipp, Thanks. I just looked here in the shop and we already have the manuals for a UHF MSR2000. ;) These were in working condition when removed from service a few weeks ago due to system upgrades and had no issues. The are complete systems, with duplexers and battery revert options already on them and were going to be tossed into the dumpster!! A fellow ham, and employee of the place, "rescued" them before it happened, and donated 2 of the 4 units he got to me, so you cant beat that with a stick. :) Not sure if they have a preamp or not yet, but hope to find out this weekend. I will take your suggestion and run it at a lower power. The 2 systems these will be replacing are not very heavily used so I shouldn't have any issues. I already have a pinout of where I need to grab my controller connections off the backplane for the squelch card and I'm ordering the crystals up now. Retuning and checking the duplexers should be no problem on the service monitors here. I'll check the bandpass on them but I suspect they are ok, since these were used by a FD in a large city, in a heavy rf area right across from NYC so I'm sure they would notice if they had problems with them.
Kevin -----Original Message----- From: skipp025 [mailto:[EMAIL PROTECTED] Sent: Thursday, October 21, 2004 12:33 PM To: Repeater-Builder@yahoogroups.com Subject: [SPAM] - [Repeater-Builder] re: MSR-2000 UHF PA in the Amateur Band - Email found in subject > "Kevin Bednar" <[EMAIL PROTECTED]> wrote: > Thanks Skipp. I believe the fella I'm getting them from has a manual > available as well. Great, the manuals are really a must have. To cover the UHF MSR, you actually need all three manuals (unless you have the microfiche). The power supplies are only covered in the VHF (green) manual. > I was going to run it at about 80 watts instead of the full 110. You'd do better to run 65 watts. I've not had a derated UHF ~65 watt pa fail when used with a circulator/isolator. > They also have the factory duplexers with them, and I'm ASSuming they > should tune down as well? > Kevin > K2KMB > Yes, if the duplexer probe kits are the 450-470 range units. Also check the duplexer for an over re-entrant energy coupling problem. It requires a spectral display with tracking gen. I've found on a few MSR UHF 450-470 versions. This will show up as an wider (broader) than normal bandpass peak that doesn't seem to allow both pass cavities in one path to completely align as one peak. I've not yet seen this problem with the T-1500 series of motorhead duplexers. Lightning stricks might be one cause of this problem, the duplexer operation will be less than good enough. I've traced this issue to 3 different UHF duplexers sent in from various (and different) east cost locations where lightning is a regular event. I'll stay with the west coast earth quakes thank you. A previous RB post mentioned a problem with the MSR Receiver front end suffering damage from lightning strikes. The msr receiver problem might be an extention of the same duplexer damage event. It does take a spectral display/graph to really see the probe kit problem. good luck skipp www.radiowrench.com/sonic 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/
