Technical information
Table Of Contents
- GoMobile Cover
- SGC – The SSB People
- Go Mobile at 500 Watts
- T a b l e o f C o n t e n t s
- I n t r o d u c t i o n
- C h a p t e r 1 C h a n g e s i n M o b i l e R a d i o
- C h a p t e r 2 O r i e n t i n g Y o u r s e l f t o 5 0 0 W a t t s
- C h a p t e r 3 DCP o w e r S u p p l y S y s t e m f o r a M o b i l e I n s t a l l a t i o n
- C h a p t e r 4 A n t e n n a s a n d G r o u n d s
- C h a p t e r 5 N o i s e S u p p r e s s i o n a n d S h o c k -M o u n t i n g
- C h a p t e r 6 I n s t a l l a t i o n P r o c e d u r e s
- C h a p t e r 7 I n s t a l l a t i o n V a r i a b l e s
- C h a p t e r 8 G o i n g M o b i l e a t 1 5 0 W a t t s
- Appendix A — QMS S y s t e m
- A p p e n d i x B — S e l e c t i o n o f E q u i p m e n t
- A p p e n d i x C — T e s t D a t a
- It all Adds Up
Our Geo Tracker and Metro installations both have 55 amp
alternators. Such typical 55-amp alternators leave about 10
amps in reserve. Automobiles with accessories like air condi-
tioning, power windows, and power seats, may have alterna-
tor capacity up to 100 amps.
Current requirements. Our 500-watt system has these
current requirements:
SG-2000 Transceiver 16 A (transmit)
0.8A (receive)
500 W Power Cube 40 A average (SSB)
90 A peak
SG-235 Coupler 0.9 A
Fifty-seven to 107 amps is a lot of current. But don’t worry;
these high current demands occur only during transmitting.
Just as the starting motor needs high current for only short
periods, the transmitter system can get enough power from
the battery system, which takes up the slack between peak
demands and average demands for power. The duty cycle for
typical radio operation is much less than 50%. That is, we lis-
ten a lot and transmit relatively little.
Current at idle: Full charging output is not available when
the engine is idling. If you must operate “mobile at rest,”
consider making some temporary provision to increase your
engine idle speed.
Testing Your Electrical System
Before you begin your installation, we recommend that you
perform at least a cursory test of your charging system. For
this you will need a DC volt meter. First, run the vehicle long
enough for the engine to reach normal operating tempera-
ture. Then, provide a load for the alternator.
• Do this by turning on some of your vehicle’s accessories.
Running the air conditioner (or heater fan on high) as
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SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331
E-mail: SGCMKTG@aol.com Website: http://www.sgcworld.com
© 1997 SGC Inc.