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
Shielding: Shielding the ignition system is the next most
likely means to reduce noise. (If such shielding becomes nec-
essary, refer to the “Mobile and Portable Stations” section of
the ARRL Handbook.)
Component noise. Noise originating in other components
must be dealt with in other ways.
Grounding brushes: Wheel static may be eliminated with
brushes. (See “Tires” in Chapter 4.)
Shutting off accessories: Accessory noise may be isolated
by turning on and off items such as heater fans and air con-
ditioners and leaving them off during radio operations.
Shock and Vibration Mounting
The two issues regarding shock mounting are physical dis-
placement and frequency.
Displacement. Displacement is a measure of how far a unit
moves when vibration occurs. In a vehicle, displacement
may be a small fraction of an inch, on a sailboat 20 feet—if
the vessel is operating in 20-foot seas.
Frequency. Frequency is a measure of how often a change
of direction takes place. On a vehicle, frequencies may run
up to many times per second, on a sailboat perhaps one cycle
in two minutes. A high speed paramilitary Rigid Inflatable
Boat might encounter shocks at rates of 1 per second or
greater, depending on sea state and mission. This frequency
requires shock mounting.
To estimate whether a shock mounting is required in a par-
ticular installation, multiply the frequency (in cycles per sec-
ond) times the displacement (in inches). If the resulting
number is greater than three, a shock mounting tray should
be considered. With a value over five, a shock mounting is
mandatory.
26
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.