184
BARRETT 4050 HF SDR TRANSCEIVER - OPERATING AND INSTALLATION MANUAL
Ignition Systems
All high tension wiring from the ignition coil through to
the spark plugs should be kept as short as practicable,
clean, and as close to the engine block as possible. The
cable should be an impregnated neoprene resistive type
and the coil must be either mounted on, or immediately
adjacent to, the engine block. The low tension wire from
the coil to the distributor contact breaker points must be
as short as possible, and not included with other wires in
a harness or loom. This wire must be shielded if more than
PPORQJ7ZLQÁH[RU¶ÀJXUHHLJKW·FDEOHSURYLGHVD
suitable shield when connected in lieu of the original wire.
This method is useful for shielding other wires suspected
of radiating noise. Do not ignore the wire to an electric
WDFKRPHWHULIRQHLVÀWWHG
Coil to Battery
Wiring
$ORZSDVVÀOWHUVXFKDVWKDWVXSSOLHGLQWKHLQWHUIHUHQFH
VXSSUHVVLRQNLWRUVLPLODUVKRXOGEHÀWWHGDWWKHFRLOHQGRI
WKLVZLUH7KHHDUWKFRQQHFWLRQRIWKHÀOWHUVKRXOGEHVKRUW
and well-bonded to the coil body.
Alternator / Gen-
erator to Battery
Wiring
$ORZSDVVÀOWHUVXFKDVWKDWVXSSOLHGLQWKHLQWHUIHUHQFH
VXSSUHVVLRQNLWRUVLPLODUVKRXOGEHÀWWHGWRWKHPDLQEDW
-
WHU\OHDGDWWKHDOWHUQDWRU7KHÀOWHUPXVWEHUDWHGIRUWKH
maximum current available from the charging system. The
HDUWKOXJRIWKHÀOWHUVKRXOGEHDWWDFKHGWRWKHDOWHUQDWRU
body or the engine block.
Alternator
to Regulator
Control Wire
(Generator Field
Wire)
This wire carries switching pulses that often contribute
QRLVHWRWKHUHFHLYHU6XSSUHVVLRQXVLQJFDSDFLWRUVRUÀOWHUV
must not be attempted since damage to the regulator
may result. Separate the wire from all other wiring, keep
it as short as possible and, if longer than about 300 mm it
should be shielded as described above.
Other Regulator
Wires
These are normally adequately suppressed using good
low-inductance bypass capacitors. To be effective, these ca-
pacitors must connect to the wires to be suppressed and to
chassis with very short leads. For this reason, the ‘pigtail’
style of suppressor capacitor often used with MF broadcast
receivers is generally ineffective at HF.
Electric Motors
(windscreen wip-
ers, fans etc.)
Small electric motors can usually be suppressed with good
low inductance bypass capacitors.
Содержание 4050 HF SDR
Страница 218: ......