Lite 1230 Bob, Senior Older Oldies
KOBB-AM, Bozeman
The station signed on the air in 1946 as KBMN. The studio and transmitter were located on North 7th Avenue in Bozeman, and played popular music.
1450 Kagy Boulevard
In 1992, the station was sold to local businessman Buz Cowdrey. The tower was dropped, and the studio and transmitter moved to 1450 West Kagy Boulevard, where the station shared a tower with KMMS-AM.
In 1993, the station was acquired by Reier Broadcasting. The call letters were changed to KZLO-AM, and the format changed to adult standards (older oldies). In 1996, the call letters were changed to KOBB-AM.
Collins 20-V2 Transmitter
Collins 20-V3 1,000 Watt AM transmitter in use at KOBB-AM, December, 2000.
Equipment Rack
Support equipment includes monitor receiver, telephone, backup audio processor, Sine remote control system, and Orban Optimod.
Bob, Senior
Other than the silicon rectifiers, this is an all-tube transmitter.
Two AM stations can share a single tower through a technique called 'diplexing.' In 1992, Kintronic Labs was contracted to construct a diplexer to combine Bozeman's two local AM stations into the single tower on Kagy Boulevard. These were the first diplexed AM stations in Montana.
These two photos show the diplexer. On the left in the first photo is the 1230 kHz matching network, with the 1450 kHz isolation network to the right of it. The second photo shows the other side of the room, where the functions are a mirror image for the other station. The 1450 kHz matching network is on the right and the 1230 kHz isolation network is to the left of it. The feed to the tower is between the photos. KMMS-AM moved to another site in September, 2000.
The box on the left is the tower light isolation network. It permits AC power to be fed to the tower lights without compromising the radiation characteristics of the tower.
Transmitter Building
New transmitter building for KOBB-AM, constructed in July, 2001.
Collins Transmitter
Collins transmitter, stripped of heavy transformers, has been set in its new transmitter building.
KOBB Equipment Racks
Essentially tucked away in a corner or the KOBB-FM studio, KOBB-AM is a station without a studio or console. In the left-most rack are the Scott SS and Scott PB that are KOBB-AM, 25-Oct-2004.
Harris DAX-1 Transmitter
In 2006, Tony Cuesta installed a Harris DAX-1 transmitter for KOBB-AM. The Collins has not been used since.
In 2008, the format was changed to all sports and sports talk.

Note to DX'ers

Even though KOBB-AM operates with only 1,000 Watts on a frequency shared with many other stations, it is occasionally heard well outside the Gallatin Valley. We welcome your reception reports. In order to receive a DX Confirmation, your report should include the following information:

Lacking adequate program details, you should send a recording of your reception. We are able to play all standard format media and sound files. We always enjoy reading about your DXpedition, the type of equipment and antennas that you use, and viewing your photos.

By e-mail:

By snail mail:

Chief Engineer
P. O. Box 20
Bozeman, MT 59718

Station Technical Summary

Service Standard Broadcast
Frequency 1230 kHz
Power 1,000 Watts Non-D
FCC Facility ID 55677
Tower Registration 1036212

KOBB-FM serves Big Sky on translator K288ES on 105.5 MHz.
KOBB-FM serves Livingston on translator K240CO on 95.9 MHz.
KOZB (FM) serves Livington with translator K265AS on 100.9 MHz.
Story Hill Electronic Site.
Green Mountain Electronic Site.

Talk 1090 KBOZ Talk 1090 KBOZ-AM, Bozeman.
Country 99.9 KBOZ Country 99.9 KBOZ-FM, Bozeman.
ESPN 1230 KBOZ ESPN 1230 KOBB-AM, Bozeman.
Oldies 93.7 KBOZ Oldies 93.7 KOBB-FM, Bozeman.
Rock 975 KBOZ Rock 975 KOZB (FM), Livingston.
KBOZ Radio Stations KBOZ Radio Stations Main Page.
KBOZ Radio Stations KBOZ Radio Stations Web Site.
Montanavision Montanavision Media Home Page.

This page updated 14-Mar-2016.