UNPACKING
This equipment has been thoroughly tested and inspected before packing.
If
you find visible
damage upon unpacking, notif y the dealer at once.
If
the unit was shipped, you must file a claim with
the carrier , since only you can r ecover for shipping damages. Your dealer and EICO will cooperate.
VENTILATION
In all installations, consideration should be given to adequate ventilation in placing the unit.
Free air circulation through the perforated cabinet should not be obstructed at any time. If heat
removal by convective air movement is prevented or curtailed by cabinet obstruction, an excessive
temperature rise will occur which can damage components. In any installation, avoid placing the unit
in a war m location (near a radiator or heating unit) or in a hot air stream.
ANTE NNAS
A suitable antenna, pr esenting 40 to 80 ohms resistive load should be connected to the ANTE NNA
connector at the rear. Install the antenna as reco mmended by the antenna manufactur er . A type
PL259 connector is r equired for coupling the antenna cable to the ANTE NNA connector . In mobile
installations, the antenna may be mounted on the trunk lid, or on a rear fender . Note that a mobile
antenna tuned to resonance may have a radiation resistance below the 40-80 ohm matching range
provided by the 753. In this case, it will be requ ired to introduce additional capacitance across the
antenna cable, pref erably at a point in the antenna cable close
t0
wher e it connects to the transceiver .
EXTE RNAL RE LAY CONTROL TERMINALS
The EXTERNAL RE LAY control terminals 1 and 2 at the rear comprise a SPST switch ( rated at
1 ampere) to per mit control of accessory equipment, in conjunction with selection of transmit or
receive operation. Terminal 1 is chassis ground; ter minal 2 is floating during receive, and connected
to terminal 1 during transmit.
For example, a DPDT coaxial relay (or a pair of SPST coaxial relays} connected to EXTE RNAL
RE LAY ter minals 1 and 2 may be used to enable operation of a high power linear amplifier with the
Model 753. The required connections are shown in Fig. 1, including an additional SPST switch to
per mit either low power "straight- through" operation with the Model 753 or high power operation with
the linear.
MOBILE MOUNTING
The mobile mounting bracket supplied per mits the unit to be installed underneath the automobile
dashboard, and locked in place in the most suitably angled position for convenient operation. Further-
more, the unit may easily be released and removed in a
few
moments without tools. This facilitates
servicing, or ,
if
desired, double use
of
the Model 753 as both a mobile and f ixed station. Fig.
2
provides all the requir ed infor mation for installing the mounting bracket and for attaching the trans-
ceiver to the bracket.
MOBILE SPEAKE R INSTALLA TION
In mobile installations,
it
is usually most practical to use the automobile radio speaker. To do
this, mount a DPDT switch underneath the dash, and use it
to
switch the speaker terminals to either
the automobile radio or the speaker output of the Model 753. DO NOT use the automobile chassis as
a ground return for the speaker, as an undesirable ground loop may be formed and result in an abnormal
degree of "whine".
2
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