Thanks to all who answered, I had to turn my attitude filter on. The info was very useful, I will be looking for the control head as soon as I get time to dive into this project.
Rob From: [email protected] [mailto:[email protected]] On Behalf Of wb6dgn Sent: Thursday, July 08, 2010 12:04 AM To: [email protected] Subject: [Repeater-Builder] Re: MSF-5000 information needed Bill, "The lower power (150 watt and below) stations do not use any supply voltage above that 13.8 volts..." What part of "below 150 watts" don't you understand? And, yeah, I was off by 25 watts; so sue me! That's irrelevant anyhow, the OP was talking about a 5 or 6 watt station in the first place! The IPA in the RF tray IS the PA for the low power station and it needs feedback for power leveling with variations in line voltage and drive. This is where the "low power control head" has it's function. Yes, all you need is a voltage divider to provide feedback to "trick" the low power PA, but in doing so, you forfeit the power leveling features designed into the power control circuitry; NOT a good idea. Like any endeavor, there is the "quick" way and there is the "right" way. Tom DGN --- In [email protected] <mailto:Repeater-Builder%40yahoogroups.com> , "Bill" <jawjabill...@...> wrote: > > > I would encourage ya'll to get the proper manual for the vhf msf-5000. The PS puts out 28v and 14v, with the 125 watt and higher pa's needing 28v. The low level drive pa between the two vco's will put our 1 to 9 watts, happier at 2-4 watts. RB website has some msf articles to trick the llpa to a given power out. > . > . > Bill > Atlanta > . > . > . > . > --- In [email protected] <mailto:Repeater-Builder%40yahoogroups.com> , "Ralph S. Turk" <w7hsg@> wrote: > > > > Looking for more information on the "Control Head". I have several CXB's without PA's. > > I will be using a Micor PA with external circulator. Looking for information on the feed back comming > > from a MSF PA to the exciter. > > Ralph > > ----- Original Message ----- > > From: "wb6dgn" <wb6dgn@> > > To: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> > > Sent: Tuesday, July 6, 2010 7:55:02 PM > > Subject: [Repeater-Builder] Re: MSF-5000 information needed > > > > > > > > > > > > > > > > > > The TPN1186 power supply provides a high current (approx. 36A.), 13.8 volt source and two lower current 13.8 volt sources, fused at 6.3 amps each. There is also decoupling and filtering on a "distribution board" which also provides overvoltage and overcurrent protection. Depending on your "12 volt" source, you may want to find a "parts donor" power supply and adapt that distribution board to suit your needs. The lower power (150 watt and below) stations do not use any supply voltage above that 13.8 volts, however. One thing that you will need, however is what Motorola calls the "Low Power Control Head". This is a rather deceptive name for a rather simple device that senses forward and reflected power and sends that information to the power control circuitry in the RF tray. This information is normally located on one of the RF amps. (I forgot which) but when the PA's are not used, the "control head" performs that function. Schematics of the power supplies and the "control head" should be on Repeater Builder TIP pages or they can be found in most of the MSF service manuals. Good luck, Tom DGN > > > > --- In [email protected] <mailto:Repeater-Builder%40yahoogroups.com> , "Robert Pease" <robp@> wrote: > > > > > > I was given an MSF-5000 for VHF, without the power supply or the PA, > > > just the rf deck and the control deck. > > > > > > > > > > > > I want to use it for a small on site repeater for linking in an EmCom > > > vehicle. My understanding is that it will put out about 5 watts without > > > the PA. Are there any problems with using it this way and what do I need > > > for DC power, I would love to run it directly off the 12V battery bank > > > that runs the other equipment. > > > > > > > > > > > > I haven't even started looking at it, it is in the garage waiting the > > > time, but with the time approaching I thought I would send our a request > > > and get some info before I jumped on it. > > > > > > > > > > > > Thanks - KS4EC - Rob > > > > > > > > > > > > Robert Pease > > > > > > P No trees were killed in the sending of this message. However a large > > > number of electrons were terribly inconvenienced. > > > > > > Think before you print! > > > > > > > > > > > > Since 1974, the award-winning Alpert JFCS has helped families of all faiths throughout most of Palm Beach County, FL, via counseling, seniors services, residences for the disabled, mentoring children, support groups and a lot more. 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