927.0125

927.0125 Repeater - Springfield, MO

On-Air Date:                    Fall 2007

Repeater Transmit:         927.0125

Repeater Receive:           902.0125             (- 25.0 MHz)

Modes:                               Analog and P25 Digital

PL Tone:                             162.2 Hz

PL Direction:                      Encode & Decode

P25 NAC:                            656

NAC Direction:                  Encode & Decode

Bandwidth:                        Narrowband – 12.5 kHz

Transmit Power:               75-Watts

Antenna System:              Commscope DB589-Y

Link antennas:                   Commscope DB-436

Coax Cable:                        Commscope AVA5-50 7/8" Heliax Repeater

Controller:                         SCOM 7330

Repeater                            Motorola Quantar

Duplexer:                            Cellwave

Link Radios:                       Motorola CDM-1250 403-470 MHz

Backup power:                  Site Generator

Router:                               N/A

Internet:                             Verizon Cellular

Nets:                                  Thursdays @ 7:30 p.m.  - Nixa ARC Check-in Net

The 927.0125 repeater originally went online operating on 927.5375 MHz utilizing an abandoned cellular panel antenna installed on the 180' Alltel monopole tower on Monet Rd north of Hwy CC in North Nixa.  The antenna only had a 90-degree radiation angle so it was far from omnidirectional coverage.  The Motorola MSF-5000 was purchased from Sarpy County, Nebraska 911 and the director and an assistant met James Adkins, KB0NHX, at the McDonalds in Rockport, MO in early 2007 to complete the purchase.

In October 2008, the club was able to move the repeater to an abandoned 800 MHz omni antenna just southwest of Republic, MO atop the 400' Alltel tower.  Holy cow - the coverage was phenomenal!  Unfortunately, this site was lost when Alltel was bought out by Verizon and the top 150' of the tower removed lowering the tower to 250'. 

In July 2011, the repeater was moved to the East County TRS site with a brand new Commscope DB809-KE-SY antenna mounted at 400' AGL with Commscope AVA7-50 1-5/8" coax with the coax cable and antenna being donated by Commscope. With this move, the repeater was upgraded from a 75-W Motorola MSF-5000 to a 150-W High Power Motorola MSF-5000 by trading equipment with an amateur on the East coast.  Unfortunately, we were unaware of a current tenant using the site for 900 MHz wireless Internet and in September 2012 the repeater was taken offline in lieu of the new 147.015 SMLRS repeater installation.

After being offline for a couple years, we were able to re-install the repeater on the Missouri Highway Patrol tower at Troop D when the DEA abandoned their antenna and feedline.  Randy VanScoy, K0RLV, did the tower work and installed the DB809KE-SY on the tower and James Adkins, KB0NHX, Mark West, KB0TPZ and Jim Adkins, KC0IYI, placed the 927.0125 repeater online at its new location in July 2014.

In February 2020, after the MSF-5000 failed, we were able to replace it with a 75-W Motorola Quantar repeater capable of P25 digital operation.  At this time, we also added a UHF link antenna to link the 927.0125 to the 444.875 KB0NHX repeater at Cox South to make it a part of the Forgotten Bands Network of the Ozarks.  This was the first P25 capable 900 MHz amateur repeater in Missouri.

In February 2023, the MSHP completed construction of a new tower at Troop D HQ and the old DB809KE-SY antenna and 47 year old RFS 7/8” coax were replaced with a DB589-Y 8 dBd gain antenna with Commscope AVA5-50 7/8” heliax.

Hints for use:  No codes required to use the repeater in digital mode.  Simply program your radio for C4FM modulation with a NAC of 656 and the repeater will switch itself to digital operation as soon as it detects your P25 digital signal.  Analog does have priority so if a station comes on to use the repeater in analog mode, the repeater will switch back to analog operation until the repeater is unkeyed.