September 8, 1961
Bulletin No. SB-867
Accessories
SUBJECT: RADIO NOISE SUPPRESSION KITS:
35, 40, 50 & 75 h.p. magneto equipped engines,
75 h.p. Alternator equipped engines.
In the past two months, radio noise suppression kits were announced for use on the
35, 40, 50 and 75 h.p. engines. In all, there are four kits as follows:
378484 - Suppression Kit for ignition system only
on 35 and 40 h.p. engines - $10.00
378486 - Suppression Kit for ignition system only
on V-4 magneto engines - $29.50
378487 - Suppression Kit for D.C. Generator circuit
only; Used with 35, 40, 50 and 75 h.p.
engines - $17.75
378700 - Suppression Kit complete for 75 h.p.
Alternator equipped engines - $65.00
These kits were developed by our marine engineering department and are designed for
use on these engines only. They are not makeshift adaptations of suppression kits
made for inboards or other applications.
The use of the appropriate kit or kits on an engine will vastly improve radio reception
on any of the normally used marine frequencies as well as C.B. (Citizens Band) radio
and standard broadcast. In addition, many depthfinders are adversely affected by power
line noise unless a suppression kit is used in the power supply to control the "noise".
In the installation instructions for the V-75 Alternator suppression kit, reference is
made to the line filter and total current draw. This line filter has a capacity (output)
of 4 amps. It is primarily designed for use with depth finders, transistorized broad-
cast receivers, etc. Normally, these units will draw less than 4 amps and the line
filter has the capacity to handle this current. If more capacity is needed, additional
line filters will be necessary. For example, if 7 amps will be required, one additional
line filter should be installed in parallel to give a total of 8 amps capacity. However,
with most quality ship to shore transceivers, a filter is incorporated in the unit’s
electronic network. Consequently, these units, which may draw upward of 8 amps during
transmission, can be wired directly to the junction box accessory terminals, leaving the
kit line filter for use with electronic gear having no internal filter network.
All prices shown are list prices, subject to the regular accessory discount.
These suppression kits should be of particular interest to those dealers who have local
government agencies using radio equipment on outboard powered boats. In addition, it
would be to your advantage to acquaint any owner of a boat which is equipped with elec-
tronic gear of the availability of these suppression kits.