VEC-1320K/1330K/1340K/1380K Owner's
Manual
27
4. Power Supply:
Use
any well-regulated 12-14 volt 500-mA DC (or 0.5 A)
power source. Avoid using poorly-regulated or inadequately-filtered 12-volt
wall-adapters. These can generate ripple on the CW note, and may even
damage your kit if the unloaded output exceeds 15 volts. A fully-charged 12-
volt battery is also a suitable power source, although transmitter output may
be reduced slightly (RF output is specified at 13.8 volts).
The power jack supplied with your kit is a common 2.1-mm DC connector. The
mating 5.0-mm OD x 2.1-mm ID plugs are available at your local RadioShack
store (274-1567). Take care not to reverse-connect the power leads.
The plus
(+) or red power supply lead connects to the center pin, and the minus (-) or
black lead connects to the outer sleeve.
If your power wires aren't color-coded,
confirm polarity with a voltmeter before installing the plug!
+
-
DC Power Supply
13.8V @ 0.5A
+
-
Important Note:
In case of accidental reverse-power connection, your kit is
protected against major damage by a "crowbar" diode (D1). However, activation
will blow a "trace fuse" etched onto the circuit board next to the power connector.
This must be replaced by a thin wire or a pig-tail type fuse before your kit will
operate again (see "In Case of Difficulty").
5. RF Cables:
For a direct PL-238 transition, use a scanner adapter plug,
catalog number 278-208 from Radio Shack. This "Motorola" adapter
requires minor modification to work with RCA jacks. To modify, shorten the
protruding center pin so that it extends about 1/8" beyond the outer sleeve of
the plug using a fine-toothed hack-saw or hobby saw. De-burr and round off
the end. The modified transition will now plug directly into RCA jacks.
Cut pin here and round off end.
Test Set-up and Procedure:
