The UARC 146.62 Repeater System
Linked to the 146.62 repeater on Farnsworth Peak
GPS Location: 40 deg 37.75'N by 111 deg 34.08'W
Approximate altitude: 9996 ft (3047 m)
An aerial view of Scott's Hill from March, 1999.
The UARC building is the second from the left.
Click on the image for a slightly larger version.
(Photo courtesy of Norm Anderson, KC7YCA)
The Scott's Hill repeater is linked full-time to the 146.620 Farnsworth Peak repeater with
the two functioning together as a single, wide-coverage
This system combines the coverage of the Farnsworth Peak
repeater with that of Scott's Hill, acting as a single repeater!
The two repeaters are now linked and operating on the same frequency so
you can seamlessly go between Farnsworth and Scott's Hill coverage
without having to change frequency! For
few more details about the way the system works, go to the 146.620 Synchronous/Voting Repeater System
The Scott's Hill 146.62 repeater of one of several
repeaters that UARC maintains, located on Scott's Hill above Brighton,
Utah at the top of Big Cottonwood Canyon, not too far from Guardsman
Repeater coverage and operation:
Repeater coverage - Farnsworth Peak:
Note that this repeater is also linked to the 146.62 repeater on
Farnsworth Peak. The two repeaters operate as a single
the same frequency, providing coverage from the Nevada, Idaho and
Wyoming borders in northern Utah and beyond.
- Via Mobile (50 watts, 1/4 wave or better): This repeater
covers into the Park City and Heber Valley areas, the southern slopes
of the Uintah range, and portions of I-80 at least as far as Evanston
with some "dead areas" in some of the deeper canyons. This
repeater also provides coverage into the upper portions of Mill Creek
and the Big and Little Cottonwood Canyons.
- Via Handie-Talkie: Coverage in should be possible in
portions of Park City and the upper portions of Mill Creek and the Big
and Little Cottonwood Canyons.
- For a visual coverage map showing where both this repeater and
Farnsworth cover, see the 146.620 coverage
- If you are in the Salt Lake, Ogden, Provo or Tooele areas,
on I-15, or are on I-80 west of Salt Lake, your coverage is likely
being provided by the Farnsworth Peak repeater.
- This repeater does not have an autopatch or any other
control function. It does have the typical timeout timer: The repeater
will cease transmitting after reception of a continuous carrier of more
than about 3.5 minutes duration. This timer is reset when the
- When using this (or any repeater!) leave a long enough
transmissions so that others may be able to break in. Who knows: they
need to report an accident, or tell their spouse that they will be home
in 30 seconds...
- Again, this repeater is linked full-time with the Farnsworth Peak
repeater. Since both Scott's and Farnsworth are on the same
you do not have to even touch your radio as you drive from the
coverage area of one into the other!
The Scott's Hill site, looking
toward the north and east with the lights of Park City visible in the
Click on the picture for a larger version.
About the Scott's Hill repeater:
In the mid-late 90's, UARC decided to investigate a small, cinder-block
building on Scott's Hill that had been long-abandoned: It's roof
was leaking, a wooden generator shed on its south side was literally
falling to the ground, providing access to the interior of the
and the door was often noted to be swinging in the wind. After
some string-pulling and formalizing of agreements with the appropriate
government entities, the club secured the permission to rehabilitate
the building and install the radio gear. For reports
on the initial work to improve the building, see
the Scott's Hill 1998 work party and the 1999 work party pages.
Almost from the beginning we decided that an "interesting" possibility
would be not just to provide yet another repeater - or even one linked
to other repeaters - but to provide, at this site, a repeater linked to
the existing 146.620 repeater on Farnsworth Peak - on the same
frequency as that repeater - and have the two work together to
function as a single, large-area repeater. For the signals from
the users, the one
transmitted from both sites would be the best of the signals
received at either site.
Alas, while the building itself was rehabilitated fairly early on,
work on the actual gear to complete the system
languished for several years. The problem? Producing a
synchronous, voting repeater system can't be built by just putting
together gear in the same way that one would for a typical stand-alone
repeater: Quite a bit of the gear had to be built from the ground
up. The original plan called for a full-duplex microwave link
between the two sites providing both signaling, frequency references
and telemetry and while some of that gear was eventually completed, it
was largely being done by very few people. As often happens, the
initial enthusiasm wanes over time as the enormity of the task
becomes increasingly apparent - so things just didn't happen.
In the intervening years the building hadn't gone completely
unused: Around the time of the 2002 winter Olympics the site was
home to some of the gear used to provide communications for security at
several of the venues and it has seen intermittent use for other
purposes as well, but we never actually completed the bulk of the gear
to bring the original plan to fruition. In 2005, UARC acquired a
GE Mastr II rack-mount base station and there were some plans to
install it as a stand-alone 2-meter repeater (not on 146.620)
on site to assess the
coverage, but with the onset of the winter and the sudden illness of
one of those working on the project, this never happened.
In 2005, Clint, KA7OEI, who had been working on the original concept
gear, had the opportunity to construct a UHF synchronous and voting
repeater system for his employer. For that project, a different
approach was taken using minimally-modified commercial radio gear, GPS
frequency references, and constructing from the ground up only a few
critical pieces. With the success of this project, lessons had
been learned and the concepts behind the more "minimalist" approach had
It wasn't until the summer of 2009 that serious discussion had gotten
underway to finally complete the original project, building on
experience gained in 2005. As with that earlier project, instead
of building the majority of the radio gear from the ground up, serious
efforts would be made to use as much of the original gear already
installed on Farnsworth as possible and use modified commercial gear
for the new site on Scott's, building only those pieces that were
necessary to make the entire system work together.
The crew of the October 10, 2009
Scott's Hill repeater installation, with the repeater itself in the
background. Left-to-right: Bruce KI7OM, Clint KA7OEI,
Gordon K7HFV, and John K7ALA.
Click on the picture for a larger version.
With these more-definite goals in mind, a flurry of activity
repeater that had been "almost" installed in 2005 was re-worked, UHF
link radios were obtained and modified, additional cavities and filters
acquired and/or built and antennas were constructed. At the same
the various pieces of additional gear - such as the frequency
controllers and the receiver voting system were being constructed and
tested as completed.
The first major work party to Scott's Hill to complete the system
occurred on August
29 and this effort saw the installation of
the transmit and receive 2-meter antennas plus the installation of a
70cm Yagi for the link to Farnsworth. This was followed later by
a trip to Farnsworth on September 9 to make initial preparation
for the installation of the gear at that site in the existing 146.62
rack and to make some minor modifications to allow the existing
repeater controller to be interfaced with the new receiver voting
On October 10, 2009, another work party was assembled and
the radio gear was installed at Scott's Hill for the first time.
Initial testing with the repeater in a "stand-alone" mode (that is,
Scott's Hill acting as an independent 146.62 repeater) showed that its
coverage was more-or-less as expected, including the Park City and
Over the "3-day weekend" of October 16-18 (and into the
early-morning hours of the 19th) the rest of the gear was
installed at Farnsworth Peak - with a minor tweak at Scott's -
completing the system and making it fully
operational. As with any new system - especially one as
complicated as this - we expected that some bugs will pop up and
adjustments will be required - and some where!
In 2010, once the winter snows had melted and we could again drive
to the site (which didn't happen until July!) some additional
modifications were made to Scott's - notably:
Upon arriving for our first 2010 visit, we were pleased to note that
not only had everything on-site survived and was still working
properly, the "up-time" on the controller indicated that it had been
running - without interruption - since our last visit in mid-October
- Minor repairs done to the roof to (hopefully) eliminate the last
of the leaks.
- Replacement of the transmit and receive J-Poles with dual-dipole
arrays. These antennas not only improved the transmit and receive
gain, but they were installed to cast a null toward an adjacent radio
site at Scott's that was radiating noise that degraded receiver
sensitivity. Reports indicate that the antenna change has
improved coverage all-around.
- Remote control of the gear at Scott's was added - including the
ability to change the squelch setting.
- Other minor modifications to fix some small bugs/quirks that had
We encourage reports from those
the system - especially in those areas east of the
Wasatch where the
coverage will be via Scott's exclusively!
The Scott's Hill portion of
the system provides coverage of the Park
City area and the
valleys and should have good coverage of many areas in the south and
slopes of the Uintah ranges. Additionally, it is expected to
into Southwest Wyoming and along the I-80 corridor to Evanston, Wyoming.
Scott's_Hill 145.27 repeater
- A description of the 145.27- repeater, also on
Hill in a nearby building, with more pictures.
This page last updated on 20110110
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