Repeater
Pictures
Thanks to Bill Easterday(KB8FU) for providing these Pictures
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This is the Lorain County Chapter of the American Red Cross. The tower to the right rear of the building is a 125 foot monopole.The one to the left rear is a 75 foot self supporting lattice structure. |
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This is the primary antenna structure at the Lorain County Chapter of the American Red Cross.It is a 125 foot tall hollow steel monopole. |
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At the top is a 4 bay dipole with its elements arranged for omni directional coverage. This is the transmit and primary receive antenna for the LCARA 147.150 MHz repeater. The next antenna is a two element dipole for the Red Cross VHF low band radio system.These elements are arranged to favor the south. A three band amateur antenna is mounted on the sidearm. Although this has 6 meter, 2 meter and UHF capabilities, it is currently used only to receive signals form the two meter remote receiver sites in Brunswick and Clarksfield. |
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This is a close up of the three band antenna on the sidearm. |
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This photo is a close up of the 2 meter repeater's transmit and main receive antenna. |
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This shows the base of the monopole, the lattice structure tower and a couple of antennas mounted to the chimney. These are yagis for 70 centimeters and 1-1/4 meters, neither of which is currently in use. |
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This is the second tower at the Red Cross chapter. It is a galvanized steel self supporting lattice design about 75 feet tall. |
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The antenna at the top is another three band amateur antenna.
The rotor at the bottom of the mast is no longer connected and serves only to hold the mast pipe in place. This antenna is connected to 6 meter, 2 meter, and 70 centimeter radios in the Radio Room. The antenna on the side arm is used with a VHF high band radio in the Disaster Services Director's office. |
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This is a 75 meter inverted vee installed in an "L" configuration. It is connected to an HF radio in the Radio Room and provides direct communications with the State Disaster Services office in Columbus when necessary. It also provides a means of handling formal message traffic on the Ohio Single Sideband Net. |
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This 400 foot guyed lattice structure is located at Lorain County Community College. At the very top are antennas for an instructional television transmitter system that covers essentially the entire county using only 10 watts per transmitter. At the next level is a 6 antenna triangular array for digital PCS wireless telephones. Barely visible in this photo about half way down is a small side arm. |
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The sidearm at approximately 200 feet above ground has a three band amateur antenna. Additional support for the top of the antenna's fiberglass casing is also provided. This 6 meter, 2 meter, and 70 centimeter antenna is used for the 444.175 MHz repeater and its frequency agile two meter remote base transceiver. The 6 meter capability of the antenna is currently not being used. |
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This is the two meter Motorola Micor repeater at the Red Cross building. To the left of the cabinet is a battery bank that keeps the system in operation during even extended power outages. |
· A 100 watt Motorola Micor amplifier for the repeater's transmitter.
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The
second component from the top of the cabinet is the 147.150 MHz Micor
transmitter.
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Next is
the back plane control rack and metering system. Many of the functions normally associated with this section
are now controlled by the S-Com 7k repeater controller.
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The Micor
147.750 MHz receiver.
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The
Micor's power supply.
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A fuse
panel.
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The S-Com
7k repeater controller. This is the
brains of the whole operation. In
addition to the paging system and the phone patch it can control up to 3
receivers. It allows routing the
audio from any receiver independently to two transmitters in any combination or
to the telephone line. As of now,
there is no second transmitter but one could be added in the future to allow
linking to other amateur radio systems.
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A Doug
Hall Electronics 4 channel receiver voter. This is what determines which of the multiple receivers has
the best audio and routes it to the transmitter.
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Two Tait
commercial UHF radios. These
receive audio from the remote receiver sites.
There is room available in the cabinet for two additional link receivers
or transmitters.
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An
auxiliary 12 volt power supply.
| This is the duplexer for the two meter repeater.
It allows simultaneously transmitting and receiving using a single
antenna. When you hear the technical folks talk about "cans"
this is what they are referring to. It
looks sort of like a six pack on steroids. |
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| The Radio Room at the Red Cross chapter will be the center of activities when
disaster communications are needed in Lorain County. |
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At the
left is a personal computer that runs a two meter packet radio system.
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On top of
the shelf at the left end is a 100 watt amateur HF transceiver.
This is connected to a 75 meter inverted vee and provides statewide voice
communications.
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Below and
to the right of the HF radio is a Midland UHF commercial radio that has been
programmed for operation on the 70 centimeter ham band.
It is primarily a direct conduit to a ham who would be stationed at
Lorain County EMA during a disaster. It
is also used for other point to point communications as needed.
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What
looks much like a telephone is a remote control for the Red Cross VHF low band
radios.
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Below and
to the right of the Red Cross radio remote is a GE Phoenix VHF high band
commercial radio that is used for communications on two meter amateur
frequencies.
· Mounted to the wall below the desk is a commercial VHF radio that has been adapted to amateur use.
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