[NCARC] IRLP proposal

[George Salzmann]

Here's the proposal I talked about at Saturday's meeting.

73,
George, AB0SF
NCARC IRLP UHF Link Proposal

The NCARC has expressed interest in establishing a IRLP node on the =
146.625 MHz, W0UPS repeater, located just south of the Rawhide Power =
Plant in Larimer County, CO. In order to accomplish this, a analog, RF =
link must be established between the IRLP host and the repeater site. =
The link must meet several criteria before being established. While the =
proceeding document establishes the basic building blocks of what is =
required to establish an RF link for the IRLP node, it is a simple cost =
analysis, not an engineering document, and is subject to change.

The first consideration is the frequency of operation. It has been =
agreed to by club members that the range of 435-440 MHz will be used. =
Although at the time link frequency coordination is not required, the =
State repeater coordinator has expressed interest in establishing =
coordination for these paths. The NCARC will contact the CCARC with an =
inquiry into the documentation needed to complete coordination, if =
necessary.

The second concern is establishing a solid voice communications path. =
This means that a near LOS (line of sight) or complete LOS path is =
required. Rick, W0RCY, has established that a path between his residence =
and the repeater site meets that criteria.

Since the repeater site's primary power is derived from solar cells, =
power consumption is a major concern. In order to reduce power =
consumption, a low power link transmitter must be used in conjnction =
with high gain, directional antennas. This can easily be accomplished =
byt utilizing a low power (2.5 watt), duplex radio manufactured by =
Maggiore Electronics. Utilizing the existing repeater controller, a S =
Com 7k, will also aid in minimizing the power budget. Since this will be =
a duplex link and a single antenna will be used at each end, a duplexer =
will be required to isolate the transmit and receive signals. Since =
neither of the path locations are high-RF sites, a mobile, notch-type =
duplexer will suffice.

The following is list of materials and their approximate cost.

Maggiore R1UHF  - 2.5 watt basic repeater                   $1020 ea
                                 w/ CTCSS enc/dec, PTT,                  =
      (2 reqd.)
                                 DB-25 interface,=20
                                 and N-connectors.

Celwave - PD633A1N 406-450 MHz compact                      $429 ea
                  Notch-type duplexer                                    =
        (2 reqd.)

Sinclair - SRL307-B2 406-440 MHz 10 dBd                     $180 ea
                 Yagi                                                    =
                     (2 reqd.)

Andrew - LDF4-50A 1/2" Hardline coaxial cable.              $400
                 150'.=20
=20
Andrew - L4NM connectors. (N male).                         $42 ea
                                                                         =
                         (8 reqd.)
  =20
Polyphaser - IS-50 NX C2 ME Lightning arrestor.             $62 ea
                                                                         =
                         (2 reqd.)

Total Cost (Less shipping and handling                      $3989      =20


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