Matthew, It's my understanding (through my experience with a PA designed for the UHF MSR2000 repeater) that in PA's for a given frequency range, there may not be sufficient neutralization at frequencies outside of that range to prevent oscillation in the amp. Your amp may "work" at the onset, but it may fail over time. That is the problem I'm experiencing with the one in my MSR2000 - it worked fine for about 6 months, and then started to fail - regularly. Even "dialing down" the output didn't seem to help (it is a 100w amp set for about 60w)...
When I sent it in for repair this last time, the shop changed out some of the capacitors to "adjust" the freq range. I'm hoping this will solve the long-term reliability problem. The "Reader's Digest" answer is: it may work just fine for you or, then again, it may not... Sorry I can't be more specific than that. If anyone else can add to this, please jump in at any time. :) I hope that answered your question. Mark - N9WYS -----Original Message----- From: w9mwq [mailto:[EMAIL PROTECTED] Sent: Tuesday, June 01, 2004 11:27 AM To: [email protected] Subject: [Repeater-Builder] Micor Amp TLD1693 and I'm Confused I have a Micor TLD1693 amp, designed for the 150 to 162 Mhz range, and am told that the amp will not operate at the 146 Mhz range, told that componets have to be changed. Here is what I don't understand about it, maybe someone can help expain it. Into a Cushman serive monitor, I'm getting 100 Watts out of the amp at both 146.925 and 154.115 Mhz, keyed down the temperature is the same after a 5 min keyup test, allowed to cool down for each test. I see no spikes or spurs at either frequency. Granted this will be used on a repeater and key down times can go much longer, but why would this amp not operate at 2 meters, just cause Motorola says the specs are for 150 to 162. I've seen amps go from 138 to 174 with no problems, just a matter of tweaking. So help me to understand what the difference really is between the TLD1693 and the TLD1692 amps. Thanks. Mathew 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/
