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BeachNet
Remote Receiver Systems
Mountainous terrain, such as we enjoy here in the Discovery Coast region, can be challenging for siting repeaters. While the elevated vantage afforded by the peaks and ridges can be desirable for locating a repeater, providing generally good range, it is
not uncommon for our users
to experience multipath distortion.
This is caused by the user's
signal finding several reflected paths
to the repeater receiver,
none of which is truly
line-of-sight. These combine
to form a
phase-distorted signal.
If the distortion is severe enough,
the CTCSS (PL) tone can be
mutilated, not holding
the tone decoder, letting
the receiver squelch open and close
and the transmission
will "chop", making
it unreadable, even with a
relatively strong signal.
The hilly terrain
also causes users' signals
to become weak when they enter
shadowed "dead areas".
Even
when the user can hear the
repeater relatively well,
they find themselves unable
to continue a conversation.
The answer to this problem
is a remote
receiver placed close
to the user, so that it
hears the user better than
the repeater site receiver.
BeachNet incorporates
three remote receiver systems.
The remote receiver system
supporting the
Megler
147.180 repeater,
is the most
elaborate,
consisting of
multiple remote
receivers, with individual UHF relay
links and a voting panel to
automatically
select the best of several
receiver feeds. This generally
overcomes the challenges
imposed by local terrain in
the south Pacific and
north Clatsop county areas.
The other two remote
receiver systems
are much simpler.
One of these supports the
North Cove,
145.310,
repeater coverage
along Highway 101,
from Naselle to Bay Center.
The other
supports the
Grays
River, 147.020 repeater.
These two systems
each consist of
a single remote
receiver in addition
to the repeater itself.
The user
determines which receiver is
used by selecting
the correct CTCSS (PL)
tone. This manual
selection method gives our
users complete control over
their signal routing into the
network.
Megler, 147.180
Repeater, Voting Receiver
System
Highway 101, and State
Routes 4 and 401 encircle
the mountain on which
the Megler 147.180
repeater is
located. These highways
are "tucked under
the toe" of the hill,
meaning the bulk of the mountain is blocking the signal and there is
no direct path
to the repeater
from users on
these roads.
The signal path
is entirely reflected,
exacerbating
the multi-path
problem
discussed above.
To solve
this we have
installed several
Remote
Receivers for
the Megler
147.180 repeater.
These all listen on the
same channel
frequency as the
repeater receiver. To
improve the
user experience,
an automatic Receiver
Voting System
manages
these resources
in real-time.
The Receiver Voting
System
uses a Voting
Panel at
the repeater site
to constantly evaluate
the signals fed in from
the receivers, and
"vote"
which of the five
has the best signal-to-noise-ratio
at the moment.
The user does nothing
special to select the
best receiver. The
Voting System
does that automatically.
The Remote Receivers
have overlapping coverage,
virtually eliminating
dead spots
in the Megler
Repeater's coverage area.
Even in places
where the
repeater transmitter sounds
weak, with multipath
and rough copy,
the signal
from the user is clean and
clear. The signals from
all five receivers
(Cape Disappointment,
Naselle, Warrenton,
Seaside and
the main repeater on
Megler Mountain), are
constantly evaluated and
the best of
the lot is routed to the
transmitter. If you
can hear the 147.180
Megler repeater, you
can probably work it,
with a typical 50-watt
mobile and a 5/8-wave
vertical antenna.
The voting remote
receiver system was
brought
on-line between September
and November 2008, and
has been fully
operational since then.
To use the Remote
Receivers, set your
radio to 147.180 +600 kHz,
and your CTCSS (PL) tone to
82.5 Hz. The
Voting Unit will
do the rest.
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The Remote
Receivers:
The
Naselle Receiver
(2000 ft),
covers
Hwy 4 from Wahkiakum
County to "Johnson's
Landing"
(Hwy 4/101 junction);
Hwy 401 from
the Columbia
River shore (Knapton) to
Naselle; Hwy 101 from
the Willapa
Wildlife Refuge
headquarters (near
south end of
Long Island)
north to Bay Center;
and the northern portion
of the Long
Beach Peninsula.
The
Cape D Receiver
(300 ft),
covers Cape Disappointment State
Park and environs; Hwy 101
from Astoria north to the
Willapa Wildlife Refuge
Headquarters; and the
southern two-thirds of
the Long Beach
Peninsula.
The
Megler
Repeater Receiver
(1300 ft),
covers the Peninsula
from Chinook north
to Oysterville,
and Astoria south to
Seaside and east to
Knappa.
The
Warrenton
Receiver
(30 ft),
covers Hwy 101
along the north shore of the Columbia
River from Chinook,
east to the
Astoria-Megler
Bridge, south
to Astoria; Hwy
401 from
the Bridge, east to
Knapton; the
south side of
the hill in
Astoria; and Hwy 101 south
toward Seaside.
The
Seaside
Receiver
(100 ft),
covers the city of Seaside,
its environs, and Hwy 101
from the Hwy 26
junction, north toward Warrenton.
This receiver
offers hand-held coverage for the
SeaPac Ham Convention and the
Hood-To-Coast Relay.
Four UHF link receivers and Voting Unit at the Megler site
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Click Here or on Map to View Megler Repeater Receiver Locations
Click here for a plot of Combined Megler Receiver Coverage
Click here for Main System Coverage Map
North
Cove, 145.310 Repeater, Remote
Receiver
One particularly
"rough" area
for our repeater coverage
is along Highway 101 from the
Hwy 4 Junction near Naselle
("Johnson's Landing"),
north to Bay Center. The
North Cove repeater
transmitter serves
this area fairly well,
but with a site elevation
of only 400 feet,
the
signal received by
the repeater can be
marginal much
of the way due to
multi-path
distortion
and local
terrain obstacles.
To solve this coverage
problem, a
Remote
Receiver
is
located at 2000-feet on
Naselle Ridge to pick up
users' signals from an advantageous
location.
This high-level site
provides superior
coverage
to most of the
area served
by the North
Cove repeater.
Installing a 2-meter
repeater
here would be
problematic, due
to the scarcity of
available frequency
pairs, and the strong
likelihood of causing
interference to an
existing out-of-area
repeater in that band.
The installation of
a Secondary
Receiver,
however is not
so difficult,
as our receiver
is unlikely to
interfere with
another repeater
elsewhere.
To utilize
this Naselle Remote
Receiver
to improve your signal,
all that is necessary
is to change your PL
(CTCSS) tone to
114.8 Hz.
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North Cove Receiver
Naselle Receiver
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To use the North
Cove Repeater with
or without the Remote
Receiver, set your
radio to 145.310,
-600 kHz,
and your PL tone to:
118.8 Hz.
to
select the
North
Cove Receiver
(400
ft. Elevation),
located on the
ocean bluffs above
Tokeland.
114.8 Hz.
to
select the
Naselle
Receiver
(2000
ft. Elevation),
located on Naselle
Ridge above Naselle.
The
North
Cove Repeater
covers an area including
Highway 101 from the Hwy 4
Junction, "Johnson's
Landing", north to
South Bend, and
then west
on Hwy 105
to Tokeland
and Grayland. Within
most of
this area, the
Naselle
Receiver
helps greatly,
providing a superior
receiver, assuring
your signals will
be picked up
clearly.
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Click Here or
on Map to View North Cove
Repeater Receiver Options
Click
here for Main System Coverage
Map
Grays
River, 147.020 Repeater, Remote
Receiver
The Grays River
147.020
Repeater is
located on KM Hill, in
central Wahkiakum
County. This covers
most of the county quite
well, and west as
far as Naselle. The
county seat, Cathlamet,
is in the eastern part
of the county, near the
limits of coverage.
Mobile stations
can work the repeater
fine, but it can be
a different story
for hand held radios.
To solve this coverage
problem, a
Remote
Receiver
is
located on Puget Island
to pick up
users' signals from a much
better location.
This site
provides superior
coverage
to most of the
Cathlamet area.
The Remote Receiver picks
up the signal from the
Hand Held radio and
relays it to the Nicolai
repeater for inclusion
in the network audio stream.
To utilize
this Cathlamet Remote
Receiver
to improve your signal,
all that is necessary
is to change your PL
(CTCSS) tone to
110.9 Hz.
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Grays River Repeater Receiver
Cathlamet Receiver
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To use the Grays
River Repeater with
or without the Remote
Receiver, set your
radio to 147.020,
+600 kHz,
and your PL tone to:
118.8 Hz.
to
select the
Grays
River Repeater Receiver
(800
ft. Elevation),
located on KM Hill,
the highest point
on Highway 4.
110.9 Hz.
to
select the
Cathlamet
Receiver
(75
ft. Elevation),
located on Puget Island,
directly south of
the city of Cathlamet.
The
Grays
River Repeater
covers Highway 4 throughout
Wahkiakum County. The
Cathlamet
Receiver
provides enhanced
spot coverage
for hand-held operation within
the Cathlamet area.
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Click Here or
on Map to View Wahkiakum County
Repeater Receiver Options
Click
here for Main System Coverage
Map
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2002-2010.
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This Page Last Updated: 01/06/13.
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