Steve, Not sure I understand what it is you are needing... I believe you said that you require the 14.4 oscillator. But then there was mention of the 5 MHz OCXO. (Or was that another thread?)
Anyway, if you have the freq reference tray but are missing the HSO (Hi-Stability frequency reference Oscillator), ANY 5 or 10 MHz OCXO will work. Look here for the solutions we used here in the US to get a series of GPS-referenced, 900 MHz stations operating as stand-alone repeaters: http://www.repeater-builder.com/motorola/msf/900-msf.html and http://www.repeater-builder.com/motorola/msf/msf5000-conversion.html You'll see references to the frequency reference tray about 1/3 of the way down in each article... The HSO normally gets installed in the open space on the left side. Hope this helped. Mark- N9WYS -----Original Message----- From: Repeater-Builder@yahoogroups.com On Behalf Of sjs1005 Thanks Bill for your reply and info There appears to be a REF OSC on the uni board, Part id and numbers are; KXN1096A 14.40000MHZ (M) X9211 Located top edge (opened) about halfway. Next to a seriously big can / RF cover ? Its a matter of now finding out which parts to take out or add ? I used fix old teles and radios 25-30 yrs ago since then i have worked for the state government in a different field. I cant even remember those days clearly anymore !, curse of working for the govt i suppose and stuck to one occupation. But now feel the need to catch up ! Seem to have plenty of time these days with the kids growing up. I do appreciate any help, i beleive a circuit diagram would probbarly be of the greatest assistance ? Difficult to find an UHF one. Plenty of 800-900 mhz though, but unfotunately those bands do not have the on board REF OSC. Motorola's (AU) position is that they now longer support these repeaters and to give the net a try ? Have pictures if needed. Thanks all Steve Sydney AU --- In Repeater-Builder@yahoogroups.com, "Bill" <jawjabill...@...> wrote: > > > > First be sure the xtal is on the board, if not you may search for a spare uni board to transfer the parts. If the cost or time get out of control, consider putting in a rubidium osc that can be programmed to the 14.4 mhz. They are plentiful on ebay and some what reasonably priced. Some operate at 15 to 18 volts. > . > bill > atlanta > . > > --- In Repeater-Builder@yahoogroups.com, "sjs1005" <sjs1005@> wrote: > > > > Hello all, > > > > I hope someone can help me out with a couple of msf5000s (UHF r3) > > > > I brought these 2nd hand from a govt department, thay are in good order. > > > > They are the CXB type. > > > > For the repeaters to fire up or lock in, they require a external 14.4Mhz reference input. I sig gen'd a 14.4 MHz signal and sure enough they locked in. > > > > I have been looking and reading a bit about these repeaters and discovered that they have a built in 14.4Mhz motorola Osc xtal on the RF board. This saves me building a exernal oven type osc on 14.4Mhz. > > > > What i need help with is reversing the external input freg and re enable the on board 14.4Mhz osc xtal? I have searched everywhere for any specific info on this as well for a manaul to no avail. > > > > Basically i need to know what resistors etc to replace or remove etc? to fire up this osc xtal ? > > > > Can anyone assist me with this ? and many thanks to all. > > > > Steve > > > ------------------------------------ Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.425 / Virus Database: 270.14.78/2521 - Release Date: 11/23/09 07:52:00
