pages will describe the technical aspects of the KE8RV Repeater System
on 147.285 MHz. Follow the links above for more information about
the indicated topics.
Repeater System is located in London OH at the Madison County
Hospital in central Madison County. There are also three remote
receiver sites located in Plain City, West Jefferson, and Mt Sterling
the north, east, and south ends of the county respectively. This
enables low-powered handheld coverage throughout the entire county, and
mobile coverage over most of the adjoining counties. (See Coverage for more information.) All
sites have emergency backup power available.
Repeater System is operated by the Madison
County Amateur Radio Club (MCARC),
and is open for all amateurs to use. For more information about
our club, click here
to visit the
club's web site.
|Welcome! - You are encouraged to use the system.|
"GET TOGETHER" NET
Tuesday evening at 8:00 PM we host a very friendly net and all
amateurs are welcome and encouraged to check in. Hear about the
latest club news and other items of interest from the members.
REPEATER STATUS -
| MAINTENANCE HISTORY:
FREQUENTLY ASKED QUESTIONS (FAQ)
does the voter work?
the main transmit site, there are are three receivers that listen to
a set of UHF link frequencies in addition to the main 2-meter receiver
on 147.885 MHz. Remote receiver sites also listen on
147.885 MHz and transmit what they hear back to the main site on a UHF
link frequency. The voter decides which one of the four receivers is
receiving the best
signal by continuously measuring the signal to noise ratio. The
signal (the one with the least amount of
high-frequency white noise) will be voted, and its signal is sent
to the 147.285 MHz transmitter. The voter may vote different receivers
several times a second if the signal is rapidly changing or
fluttering. The best signal is always sent to the transmitter,
assuring the best possible signal to the transmitter.
are the receivers located?
||The main receiver is located at
the transmitter site in London, OH, at the Madison County Hospital.
The north receiver is located in Plain City, OH at the Pleasant Valley Joint Fire District Firehouse.
The south receiver is located in Mt Sterling, OH at the Firehouse.
The east receiver is located in West Jefferson, OH near the High School.
is the meaning of the CW
(Morse Code) at the end of each transmission?
||It is the indication of which
receiver was voted the most during a user's transmission by sending a
specific letter in Morse Code at the end of each transmission:
|Also, the pitch of the CW
character indicates how many of the receivers you "hit" during your
transmission. The lowest pitch indicates only one receiver, and
the highest pitch means that you have a strong signal and are hitting
all four receivers. The intermediate pitches indicate that two or
three receivers are receiving your signal.
||Why am I sometimes
voted into a receiver that is not the closest to me?
||The voter will always choose the
receiver with the best signal. However, if you have a very good
signal (full quieting) into more than one receiver, the voter cannot
choose which one is best because there is no difference to detect (it's
a tie.) In that case, the voter will lock onto the first receiver
that comes up. Usually that will be the local London receiver
because there are no link delays with that receiver.
an Autopatch available to
make telephone calls?
||No. The repeater has the
necessary hardware, but no telephone line is available at the repeater
much power is the repeater's
||100 watts at the transmitter,
but with losses in the isolator, duplexer and feedline, there's less
Watts at the antenna. However, the antenna has 6-9dB of gain in
its best direction, so the Effective Radiated Power (ERP) is greater
than 100 Watts in most directions.
the repeater's antenna is
||Yes, sort of. Since the
antenna is closely side-mounted to its tower, there is a weak null to
the southwest of London.
a subaudible tone (CTCSS, PL,
etc.) necessary to access the system?
||No. However, the remote
receivers are designed to have a higher sensitivity (actually, a looser
squelch) if you are using a 82.5 Hz subaudible tone on your
signal. If you are out in the fringes with a weak signal, then
using 82.5 Hz subaudible tone may improve your signal quality into the
questions or comments about this web site, send an email to:
|This page last updated November 1, 2013||