Batboard

Posted: **Thu Dec 25, 2008 6:01 pm**

Hi Group,

Tried searching for this briefly but found nothing. I recently came across a Securicor frequency standard at the shop that is working and producing a clean signal on 10.0MHz.

I have a few 900MHz MSF 5000's that were all using a master oscillator at 5MHz, obviously now that they aren't part of a trunking system, each one is in need of it's own master oscillator.

I recall reading somewhere on the board here that the UHSO tray on the MSF 5000 (the one that requires an external master oscillator) could be jumper-selected to a few different reference frequencies.

Obviously I'd like to use this Securicor Frequency Standard on 10MHz as a reference for one of the MSF 5000's. Can anyone point me in the right direction as to what the UHSO tray jumper setting are for the various frequencies?

Any help would be appreciated. Thanks!

Posted: **Fri Dec 26, 2008 4:01 am**

Here's something I posted some time ago. ....

willbartlett wrote:
Dave, if you could look up the jumper settings for some of the other frequencies, I, and a lot of other people, would be eternally grateful.....

Will

OK then... Dug in the garage and came up with this. The Reference Synthesizer Board is a TLF 6816A. It has a 14.4 MHz VCXO that is phase locked to the HSO which can be 100 KHz, 1 MHz, 5 MHz or 10 MHz. I have only run the stock config of 5 MHz in many sites but I have had 10 stations daisy chained to a single source when I had a failure. Jumper settings are: JU20 OUT, JU21 OUT = 100 KHz. JU20 OUT, JU21 IN = 1 MHz. JU20 IN, JU21 IN = 5 MHz (default) JU20 IN, JU21 OUT = 10 MHz. These jumpers are 0 Ohm resistors. The HSO has to be very stable due to the reference dividers that are in the chain. I've run stations using the output from a service monitor at +5 dBm but I don't think it will lock at 0 or less.

Looking at some of the latest posts, looks like there will be lots of 927 machines going all over the place. Good Luck with it!

BTW... If someone came up with the MSF 5K 900 TRUNKED station manual, the schematic and board descriptions are located in the reference synthesis tab. There should be simular in the PURC 5K book also.

Dave

Posted: **Fri Dec 26, 2008 7:49 pm**

Just what I needed. Thank you Dave!

Posted: **Tue Dec 30, 2008 2:16 pm**

After looking in my stations, they have TRN9910 boards in the UHSO tray (but obviously no UHSO).

I didn't see the aforementioned jumpers anywhere in there.

Any ideas how to get this to 10MHz?

Posted: **Tue Dec 30, 2008 9:21 pm**

Sorry 'bout that.... that what was in my station a few years ago. Found the TRN 9910 info in the trunked 900 MHz MSF book, it says for 10 MHz reference JU1, JU3, JU8 and JU9 are in, JU2, 4, 5, 6 and 7 are out

Dave

Batboard

MSF 5000 UHSO tray - Alternate Reference Frequencies???

MSF 5000 UHSO tray - Alternate Reference Frequencies???

Re: MSF 5000 UHSO tray - Alternate Reference Frequencies???

Re: MSF 5000 UHSO tray - Alternate Reference Frequencies???

Re: MSF 5000 UHSO tray - Alternate Reference Frequencies???

Re: MSF 5000 UHSO tray - Alternate Reference Frequencies???