Ron, Tnx for your input. I have an older Mocom70 mobile manual that's no help.
What I'm specifically looking for is the schematic on the Input attenuator & RF sense keying PC board, NLD7141A, so I can enable/disable the amplifier from the repeater controller. This input RF sense keying board would not normally be used in a base station or a mobile, so it's a little different. I'd also like to see the schematic of the power controller section to see if I could utilize the temperature sensor to activate an external heat sink fan. I don't like to run a fan continously as they tend to fail after a few months. Default case is to key a 12 Volt heat sink fan only on transmit - thus I would like to get a schematic of the RF sense keying board without having to reverse engineer it - not easy to remove. George WA2VNV --- In [email protected], Ron Wright <[EMAIL PROTECTED]> wrote: > > George, > > Is this PA in a unified chassis. Mot built base stations with such a PA that was mounted beside the exciter With heat sink sticking out. It used the same PA as in the mobiles. > > 73, ron, n9ee/r > > > > > >From: George Sintchak <[EMAIL PROTECTED]> > >Date: 2008/04/01 Tue PM 09:48:06 CDT > >To: [email protected] > >Subject: [Repeater-Builder] Motorola N1254A Power Amp for 2M repeater info > > > > > > >Hi All, > >I've searched the archives & website for info on this Amp and can't find anything. It's sort of similar to the N1275A or the N1248A convert-a-com amps but for a Motorcycle (I was told). It looks like the back end of a MoCom 70 heat sink. I need more specific schematic or manual info so I can integrate it into the repeater keying control logic. The Amp is working fine on 147 MHz, keys up on RF input and makes rated output. I want to use it in repeater service at reduced (~40 Watts) output, possibly with a small fan for cooling, as needed. Anyone have any history/info using this Amp? > >Model N1254A, 150.8 to 162.0 MHz, Mfg Aug 1977. > >Max input 7 Watts, Output 60 Watts. FCC # CC 3303. > >Power Amp board TLD8922A uses M9622/23/24 & two M9625's for final transistors. > >Output directional coupler/power monitor board, TLD8922A. > >Input attenuator (-3 dB) & RF sense keying board, NLD7141A. > >Input/Output bypass relays are 23C84103B01. > >Any info, links, etc. much appreciated. > >Tnx, & 73's > >George > > > >
