2 - Meters
Receiver, Exciter, and Power Amplifier:
Motorola "Micor" Series
Duplexer: Celwave PD-497-1
Controller: Compter Automation Technology
Control Receiver: Motorola "Spectra TAC"
Transmission Line: 7/8" LDF Heliax
Antenna: Sinclair SD-224
280 ft above ground
147.075 repeater is dedicated to the memory of its founder:
George Shaver, K4HXD 1943-1995
OPERATIONAL STATUS: ON THE AIR!
The 147.075 (+) repeater is located on McKinney Ridge, in
of Knoxville, TN. on the west side of town,
intersection of Interstates I-40/75 and I-640.
is located just West of downtown Knoxville,
making it perfect for local use.
It features an auto patch,
a voice ID system and emergency backup power, which make it perfect for
in the urban areas of the
city of Knoxville,
while other larger scale coverage
machines might be needed for larger-scale regional emergency communications.
The 147.075 repeater shares the building with two 10 kilowatt solid-state
transmitters which serve as backup transmitters for WIVK-FM and WOKI-FM.
The repeater site has full emergency power, and 147.075 has an open
autopatch available for amateur use. It is requested that users ID
ON and OFF when using the autopatch to comply with FCC rules.
Photo above: The 147.075 antenna is located at 280 feet on the 300 foot
tower. It is a Sinclair SD-224 four-element exposed dipole array. It is fed with
7/8" foam feedline.
The 147.075 repeater provides excellent local coverage
in and closely around Knox County, and continues to provide a open autopatch
for Amateur Radio use.
In the photo to the left, you can see from top to bottom:
The 100 Motorola "Micor" Power Amplifier (PA), then the 147.075 "Micor"
exciter. Next is the homebrew control panel (similiar to the 146.94 and
444.3 repeaters), just above the CAT 1000 repeater controller. Below the
controller is a rack panel that has a screw terminal for interfacing and
control purposes. Below the panel is the Motorola "Spectra-Tac" UHF control
receiver. The six cavity Celwave duplexer is visible to the left of the
repeater cabinet. The 147.675 receiver power supply is at the bottom of
the photo (the receiver is not shown in this photo)
Instructions for using the WB4GBI Autopatch:
(Note: There is a 4-minute limit to each autopatch session!)
- Key your mic and identify yourself, with
your intentions to use the autopatch... Such as: "This is
WX4ABC accessing the Autopatch..."
- with the mic still keyed, and
using your DTMF buttons... enter the (*) key.. followed by the
7-digit phone number. (No Long Distance
numbers will be accepted)
- Release the mic key... and listen.
If the autopatch is accessed correctly, it will repeat back to you "Accessing
Autopatch..." (followed by the number you just dialed)
- You will then hear a series of beeps...
while the machine dials your number. In a few moments, you will hear
the phone ringing... then your party will answer.
- Note: Be sure to tell them they
are on an autopatch, so they will know the conversation is being transmitted!
- Carry on your conversation as normal
- releasing your mic to hear the other party's responses.
- To hang up... simply key your mic, and
press the (#) key -then release.
- The Autopatch will hang up the phone,
then ID itself... give the time... then ask you to "Please Identify..."
- Give your callsign to let everyone know
that you have finished using the autopatch, and have returned the repeater
to normal use.
the Scenes of the 147.075 repeater site
Here is a photo of one of the Harris "Z10" 10 kilowatt
backup transmitters that are housed at this location. The 147.075
repeater is located in the background to the left.
History of the 147.075
147.075 has the distinction
of being Knoxville's first privately owned open autopatch repeater.
George Shaver, K4HXD (now SK), originally
put the repeater on the air in 1982. It was placed in service at
a the residence of "Doc" Gilmore, WA4MCX (now SK), who lived on top of
Beaver Ridge in North Knox County.
Tim Berry purchased the repeater from George
in 1986. He moved the repeater to Black Oak Ridge at the residence of
Walter Taylor, father of Greg, N4KAC. It remained at Mr.
Taylor's home until 1992.
Tim relocated the repeater to the WUOT-FM Auxiliary
transmitter site on the West side of Sharp's ridge shortly after Tim became
the new Chief Engineer of WUOT-FM Radio in 1990. This repeater remained
there for several years, while Tim continued his work there... but he
found a new location for the repeater in 1998.
The repeater was moved to its present
location in 1998, after Tim accepted the position as Chief Engineer of
WIVK-FM and its sister stations. At this location, the radio stations
have their backup transmitters, which make it a perfect spot for a repeater
due to it's relative close-in location and emergency backup power system.