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This is the inside of the
receiver chassis at Plain City. The receiver is in the lower
right,
and the new microprocessor based controller with DTMF
and CTCSS decoders is to its left. The chassis at W. Jefferson looks virtually the same. Not shown - the UHF link transmitter is mounted in its own chassis on top of this chassis. |
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This is the inside view of
the UHF link transmitter chassis. It is mounted on top of the receive
chassis. The complete assembly is shown in the next photo. |
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Here is the complete receive
site package at Plain City. The receiver and transmitter chassis
are on the
top, and the 12V/13AH gel-cell battery and trickle charger are on the
lower shelf. |
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This is the installation of
the West Jefferson site. It is located outdoors in an unheated
storage shed at the base of the tower. The Hamtronics receiver
and transmitter use the optional TCXO (Temperature Compensated Crystal
Oscillator) so the frequency doesn't drift even with extreme
temperature changes. On the right side of the photo is a 12V/13AH
gel-cell battery for backup power. A new power supply that
doubles as a float charge has been added since this photo was taken. |
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The outdoor storage shed at
the West Jefferson site. |
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This is the
microprocessor-based controller
board used in the West Jefferson and Plain City receiver sites.
It
is the only non-Hamtronics component of the systems used at these
sites. The originally-used Hamtronics COR board had too long
delays and poor
frequency response. The receivers were modified to use discriminator audio, and the transmitters were fed directly into the VCO (through a 4 KHz splatter filter) to obtain flat frequency response and linearity. |
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The antennas at the West
Jefferson site. A very old Hustler G6-144 was rebuilt and side
mounted at about the 25 foot level. The UHF link antenna above it
is a Cushcraft A449-6s. |
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Installing the antennas with
the convenience of a rented bucket truck. (W. Jefferson) |
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The antennas are being serviced by Don Kovalchik (W8DPK) and Don Brewer (WD8BHK). The 2-meter antenna, a Hustler G3-144, is installed at the 40 foot level, and the UHF link antenna, a Cushcraft A449-6s, is just below the neck of the tower. (Plain City) |
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Another view of the antennas on the firehouse's tower. (Plain City) |
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The Pleasant Valley
Joint Fire District Firehouse in Plain City. Our antennas are on
the tower on the right side of the building. Our club's HF
station is also setup here. A 80-meter off-center fed dipole is
attached just below the 2-meter antenna on the tower. |
| Copyright
© 2006, 2009 All rights reserved Donald Kovalchik |
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| This page last updated January 5, 2009 |
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