About the K9VI Repeater System
|The K9VI group operates repeaters on 51.910 / 52.910 PL 114.8Hz
and 223.100 / 224.700 PL 100.0Hz. Co-located at the site are UHF
and VHF machines operating on 145.33 / 144.73 PL 107.2Hz and 443.475 /
448.475 PL 114.8Hz. These machines are open for all amateurs to
use, except we request that priority traffic take precedent during
severe weather or any other emergency usage of the machines. The
6M machine operates at a power of 100 Watts TPO with a gain of 3dB.
The antenna is located at 475 feet AGL. The UHF and 222 machines
operate at power levels of 100 and 25 watts respectively, with a
center of radiation at 460 feet AGL. Finally, the VHF machine
operates at a power level of 125 watts with a center of radiation of
330 feet AGL. Ground level at the base of the tower is 890 feet
AMSL. We thank the owners of WZSR (Star 105.5) for the tower
space they generously provide for our systems. In exchange, we
provide engineering and other services on an as-needed basis.
The repeaters and control systems are neatly contained in 2 rack
units, including monitoring of the statewide emergency channel (EAS
channel for Illinois) on 45.44MHz and the NOAA National Weather
Service local transmitter, co-located on site, operating on
162.500MHz. The third unit is the 6 meter repeater. The 6M
duplexer will shortly be moved to a ceiling-mounted location, to free
up floor space. Here is a photo of the repeater racks:|
I hope to post better pictures of the system very soon. In
addition, we are working to add additional receive sites for the 6M
system as well as automatic linking of the 6M / 222 system, already
linked fulltime, to the UHF system. Finally, we are working to add
a 1.2GHz system in the not-too-distant future.
In addition to the repeater work, I also do a limited amount of
broadcast engineering; mainly to keep current in that field of work.
I have been working closely with the great people over at WGN radio in
Chicago since 1985 and I have been involved with WRPQ radio in Baraboo,
where I am a stockholder. WGN and WRPQ are are opposite extremes
of the AM broadcast industry. WGN is a 50kW clear channel station
that generates tens of millions of dollars in revenue each year in the
third largest city in the US - Chicago. WRPQ is a 250 watt
daytimer with an after hours operating authority for 6.4 watts.
Yet, WRPQ serves the greater Baraboo, WI region as well as any big city
station. Please enjoy a few pictures of each station, plus a few
more of the more than 250 stations I have performed engineering work at
around the world over the past 25 years.
The new ATU under construction for WRPQ
An oblique view with the turns counter installed on the cap.
RF Design by Greg Buchwald, construction by Jim Taylor and Greg Buchwald
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