User's Manual

reflecting/refracting object. Obviously, a perfect “free space” environment for the
SSR is the ideal location, but not practical. However, a major goal of the operating
location selection process is to find a place that approximates a “free space”
environment as closely as possible.
A location that provides a “clear” communication link with a suitable base station
signal using a typical handset is also required for proper operation of the SSR. Base
station signal level at various candidate locations should be measured using the RSSI
on a handset or more precise instrumentation. Experience indicates that a location
with the highest base station signal level that is free of any object within a 15-20 feet
radius hemisphere centered on one side of the SSR should provide suitable SSR
operation.
2.2 Mounting Considerations
Mounting should be accomplished with due consideration of the minimization of
undesirable feedback signal discussed in section 2.1. Early product development
testing used 50 lb. braided nylon cord and small “S” hooks to hang the SSR four or
more feet below a convenient overhead structural member (see Figure 4). Mounting
devices made of non-conductive, low dielectric constant and/or high loss tangent
materials attached to any edge that minimally blocks the grooves between the fins on
the edges may be used to mount the SSR.
2.3 Power Supply Location & Connections
The power supply furnished with the SSR requires a standard US 110 VAC outlet. It
connects to the SSR via a permanently attached two-conductor cable with a special
polarized connector and RF absorbing material on approximately 18” of length
adjacent to the SSR. The location of the power supply also requires special attention
to the minimization of undesirable feedback signals. The recommended location is as
near the plane that bisects the SSR around the finned edge as possible and as far away
from the SSR as possible.
3.0 Operation Guide Lines
3.1 Power / Interface Circuit Board
All controls and indicators for the SSR are mounted on the power / interface circuit
board (PWR I/F); which is mounted in one of grooves between the edge fins (see
Figures 1 & 2). The four small LEDs mounted on the PWR I/F provide the following
information:
On state indicates that SSR is receiving power
from the power supply and the internal circuitry
has not exceeded the maximum safe current
demand.
Green LED at edge of PWR I/F most distant
from power connector.
Off state (concurrent with an off state for the
adjacent Red LED) indicates that the SSR is not
receiving power from the power supply.