[Repeater-Builder] Re: Motorola Radius P50
Several weeks ago it seemed that someone had an interest in acquiring UHF Motorola P50 radio sets. If anyone is interested, email me directly I have a fair assortment compact / standard and keypad equipped p50+ complete units, boards, chargers and I would love to clear away some space. BRIAN
[Repeater-Builder] Atten Test Meter TLN2418A Owners
Dear Group, Nothing like a broken piece of test equipment. Going to a site for emergency repair and finding you've got a bad test set is worse than being bitten by your seeing eye dog. Just passing along an experience related to the MSF5000 test set # TLN2418A. I have had a test set fail due to secondary damage from being knocked about. You may be able to save future aggravation by opening your test set and re securing the speaker, which is held in place by push on spring clamps and some not so hefty plastic pins. In my case the speaker detached, slid over and contacted active electronics, which were not to happy for that experience. If yours is not broken, additional insulation on the back of your speaker would prevent this. If some pins are missing, some Goop or the like might be helpful to permanently hold the speaker in place. BRIAN Enter for Your Chance to WIN* The TotalBeauty.com Summer Spa Sweepstakes! http://thirdpartyoffers.juno.com/TGL2141/fc/JKFkuJi7UfhmKeCY5W92g6J0mpAhxGGNgaZdvTieyCVAtFPDT99W8S/---BeginMessage--- Dear Group, Nothing like a broken piece of test equipment. Going to a site for emergency repair and finding you've got a bad test set is worse than being bitten by your seeing eye dog. Just passing along an experience related to the MSF5000 test set # TLN2418A. I have had a test set fail due to secondary damage from being knocked about. You may be able to save future aggravation by opening your test set and re securing the speaker, which is held in place by push on spring clamps and some not so hefty plastic pins. In my case the speaker detached, slid over and contacted active electronics, which were not to happy for that experience. If yours is not broken, additional insulation on the back of your speaker would prevent this. If some pins are missing, some Goop or the like might be helpful to permanently hold the speaker in place. BRIAN ---End Message---
[Repeater-Builder] Re: Current Draw of MSF 5000 UHFF 5000 UHF
Dear Andrew, Sorry for the delay but I hope this helps. Its not for the MSF but rather it's close cousin, a hundred watt UHF MSR2000 (same power supply). I recently had the occasion to build a 12 hour UPS which required my assessment of watts usage versus RF watts out. Listed below are my findings. Watts Recieve CDX = 70 TX 10W =218 TX 20W =269 TX 30W =321 TX 40W =354 TX 50W =404 TX 60W =430 TX 70W =480 TX 80W =512 TX 90W =549 TX 100W =567 BRIAN
[Repeater-Builder] MSR 2000 UHF Repeater
Dear Group, To change a MSR 2000 UHF repeater from PL to DPL are any jumper changes required anywhere? Or is a direcet card swap without any changes all that is required. This would be using the TRN5076A duplex DPL card. Thanks. BRIAN
[Repeater-Builder] Re: Motorola R1225 versus Kenwood TKR-750
Dear Group, I am a fairly new member and this is my first posting, but I think I can help on this one. I have had considerable experience with R1225 PA meltdown. It defiantly will not support high duty cycle at full power. In the course of rebuilding I have found three things that allow them to survive. 1) The PA transistor in almost every case is not torqued correctly and has poor thermal transfer to the fairly massive heat sink. I have found that the screws require up to about an additional half turn. I attribute this to significant improvement in heat survivability. 2) The silver solder is a real good idea when putting things back together. 3) Don't run it above 9 amps. This should make about 25 Watts. It seems to hold under worse case conditions at this point. In the extreme when the ambient temperature is like the inside of a closed car left in the sun, additional fan cooling is additional insurance. Best of luck. Would like to hear if anybody else has encountered this transistor torquing problem. BRIAN ALESIO B.A. Radio Company Inc. It's not so much a defect as it is asking the rptr to do more than it was designed for. It may be a 45 watt PA but in rptr use, medium to HD rptr use, drop it down to about 25 to 30 watts out of the PA. Enjoy what you get thru the duplexer. Asking for more will melt the PA. The earlier units had a temp controlled fan that only came on when the PA was about to melt. The next generation of power supplies came with a switch to turn the fan on permanently. You will probably be able to fix them without the manual. Most of the time the PA transistor collector got hot, melted the solder the chip caps moved (slid down the pcb due to gravity). I repaired these on a regular basis without needing new parts unless the damage literaly burnt the pcb around the collector lead. I removed the chip caps, removed the solder on the collector tab trace resoldered it all back in with silver solder. This, along with turning the factory output down, made them last a long time even under HD casino use. I think it took me maybe 45-60 mins to get it all apart, fix it, reassemble, reinstall. Lots of times I did it in place at the customer's premises. rtc
