TM 5-4310-227-15
suppression include shielding the ignition and
The gasoline engine ignition system is a com-
mon source. Magneto breaker points, generator
high-frequency wire, grounding the frame with
commutators, relay contacts, and static charges
bonding straps, and using capacitors and resis-
collecting on the frame are other common
tors where necessary.
sources which in some way must be suppres-
sed.
a. Primary Suppression Components. T h e
Proper Suppression
primary suppression components are those
whose primary function is to suppress radio
Essentially, suppression is attained by pro-
interference. These components are described
viding a low resistance path to ground for
and located in figure 3-6.
the stray currents. The methods used to attain
A-Capacitors
B-Bonding straps
1
Electrical lead
1 Air shroud
2
Capacitor, 0.1 us, 100-V dc (3 rqr)
2 Ground strap
2
Shock mount
3 Nut
4
Screw
4 Bottom pan
b. Secondary
Components.
Suppression
OEG-458-ENG-2, the spark plug, which is lo-
These components have radio interference sup-
cated on top of the engine cylinder head is in-
pression functions which are incidental and/or
tegrally shielded and radio interference sup-
secondary to their primary function.
pressed. The ignition cable assembly is con-
nected to the magneto and spark plug. The
cable is insulated and enclosed in metal braided
Components
shielding, which is grounded at the spark plug
and magneto connections; model 13 BMW-452-
458-ENG-1 is not radio suppressed; model
ENG utilizes three capacitors (2, A, fig. 3-6)
