Sine Systems RFC-1/B Instruction Book

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4\ /|\ WARNING!
L ----- 4 — - — -> Do not under any conditions apply a DC
voltage greater than 19.9 volts (peak, if significant ripple is present) to the RFC-
1. Prolonged exposure will cause the over-voltage protection circuitry in the
RFC-1 to overheat and be damaged. This maximum voltage rating precludes
the use of some rechargable batteries.
If you have the capability for operation from a back-up battery, you may want to have the
ability to telemeter power line voltage. This can be done easily with an unregulated wall-plug
power supply, a Radio Shack 273-1552 for example, connected to one of the telemetry inputs.
After measuring the power line voltage, the telemetry channel can be calibrated directly in
volts. For example "1175" would correspond to 117.5 volts.
Operation at Sites Without a Telephone Line
The RFC-1 is designed to be connected to an ordinary telephone line. In some cases, a
telephone line is either not available or is prohibitively expensive at the site where the RFC- 1 is
to be installed. This is usually because the site is very remote or otherwise difficult to access.
In these cases, there are several alternatives to a regular telephone line. Here are some
suggestions:
The "Rural Radiotelephone" or "Ranch Telephone":
Rural radiotelephone systems, or "ranch phones" as people like to call them out west, are
systems that use a full duplex VHF or UHF radio circuit to extend a telephone line. There are
two "boxes" in a system. One is installed at a location where there is a telephone line and is
connected to a small Yagi antenna. The other box is installed at the remote site and is
connected to another Yagi antenna. The second box has a RJ-1 1 jack that behaves just line a
regular telephone line. The RFC-1 and a local telephone can be used with this system just as
it would be used with a regular telephone line. The RFC- 1 and the local telephone can receive
and make telephone calls. Rural telephones have a range of 1 to 10 miles or more depending
on terrain. The transmitter power levels are usually in the range of 1 to 10 watts. Because
they contain transmitters, rural telephones must be licenced. Channels are scarce in the
more populated areas of the country but are usually available in the areas where rural
telephones are most often needed.
The big disadvantage of rural radiotelephones is the initial cost; about $5200 for a typical
system. This is somewhat mitigated by the fact that, once installed, there is no recurring
cost. A company which sells rural radiotelephones is DX Radio Systems, 3370 San Fernando
Road, Unit 206, Los Angeles, CA, 90065. Their telephone number is (800) 447-6937 or (213)
257-0800. Another source for such equipment may be your local telephone company.
Cellular Telephones With “ RJ-11 Adaptors":
It is possible, with appropriate adaptation, to use a cellular telephone at the RFC- 1 location in
place of a regular telephone line. Adapter devices are available which can allow interface a
cellular telephone with a standard RJ-11 jack. These devices generate the standard telephone
line protocol including "battery," dial tone and ring voltage. In other words, they can make a
cellular telephone emulate a regular telephone line. Add to this a 12 volt DC power supply, an
external antenna, and you're in business. Because of a patent they own. Spectrum
3.00.2
Installation
page 5.9

Sine Systems RFC-1/B Specifications

General

Brand	Sine Systems
Model	RFC-1/B
Category	Remote Control
Language	English