WN7C REPEATER INFO
GENERAL INFORMATION
A repeater is a set of radio's that receives signals and then retransmits
them on a new frequency for the purpose of extending the range of portable
and mobile radio's. A 1 watt handheld radio while within the range of a
repeater can communicate to anyone that can hear the repeater. Repeaters
are usually located in locations on hills or tall towers to increase their
range. The repeater must either use two antenna's or have a special filtering
device called duplexors to allow the same antenna to be used for transmitting
and receiving at the same time. Some repeaters have a connection to a phone
line so outgoing calls can be made from portable equipment. This is especially
handy for cars that get stranded and need a tow truck, or for calling in
an accident to the police. Access to repeaters is sometimes limited by
use of subaudible tones. To access the repeater your transmitter must include
a tone generator on the correct frequency. This is done to limit interference
when there are users of other repeaters accessing the repeater unintentionally
EQUIPMENT
The WN7C repeater is located in Mt. Gilead, Ohio. This is 45 miles north
of Columbus Ohio. The repeater is a Motorola Micor base station commercial
repeater that has been retuned to 146.775MHZ transmit and 146.175MHZ receive
frequencies in the 2 meter amateur band. The transmitter power is 100watts.
I have added an Advanced Receiver Research Gaasfet preamp to increase the
performance of the receiver. The originall controller was homemade and featured activity
timers, a talking clock, a phone patch, a PL decoder and a remote base
to another repeater on 224.940Mhz. After a lightning strick that damaged
everything the controller was replaced with a Cat700 repeater controller. The duplexors are 4 cavity Sinclair
ring duplexors. The antenna is a Ringo Ranger ARX2. The antenna
is side mounted on the tower at 110' above ground level, approximately 1300' above sea level. .
back to WN7C Amateur Radio
send comments to wn7c@redbird.net