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6.
Preset the LA-1000 meter switch to the I (current)
position.
Key your exciter and begin to increase the C W
c a rrie r level u n t ill reaching approximately 300 m A on the
plate current.
maximum output on your wattmeter.
your exciters output u n till you reach approximately 600mA
(.6A X 1166v = 700 watt DC in put).
7.
Repeak your Tune and Load controls fo r maximum output.
To operate SSB, tune the LA-1000 as stated above.
fu lly tuned in CW , simply change your exciter to SSB.
further adjustments to the LA-1000 are required.
Power Supply
After the LA-1000 has been in stalled according to
the instructions, and power is applied, SI is used fo r in
i t i a l turn on.
former, and to the fan, Bl.
of the transformer are used to produce filim e n t voltage
(6.3v) relay control voltage (12v) and HV.
developed by use of a h a lf wave r e c t i f ie r .
applied, meter lamp X2 and LED D1 (in ternal part of SI)
w ill lig h t.
The closing of S2 allows 12 v to be applied to the
relays (RL2-6) in the tuned input, the QSK module, the Xmi
lamp XI and the LED D2 ( internal part o f the S2)
The high voltage section is made up of 8 diodes in
a bridge c irc u t.
p a ra lle l with a .01 uf capacitor (C23-30 fo r transient pro
tectio n, and a 470 Kohm h w resistor (R 3-10} for equal
ization .
For f i l t e r i n g , 3 125 uf 0500 v capacitors ( 031-
are used in series.
tor (R15-17) in p a r a lle l.
RF Operation.
When S2 is in the OPT mode, 12 v is applied to the
tuned input relays, the QSK module and the transm itter ligf
The band switch w ill select a ground path fo r one of the
tuned input relays, allowing the proper section to be plac<
Quickly turn the TUNE and LOAD control for
THEORY O F OPERATION
AC is applied to T l, the main power trans
Each diode (D4-11) is a 3 am p lOOOpiv in
Each has a 10GK ohm 2w bleeder resis
Contimue to Increase
The three secondary windings
W hen
No
The I2v D C is
W hen power is
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