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Complete exciter with pta.
lent regulator tubes should be used with t he
required dropping resistor (value depending
un voltage). The OI7-ARTl3 pta should not
be used with more than 105 volts to
minimize harmonic output. Once the power
supply is assembled, the pta should be
connected and checked by listening for its
signal on the low end of the BC band.
2. Next the crystal oscillator should be
completed. The only critical parts are the
feed back capacitors from cathode to ground
and fro m cathode to grid. The operation of
the shift control may be checked by shorting
across capacitor C I with a screwdriver.
3. The two-triode balanced modulator
requires no push pull input of any kind. The
tuned circuit Ll-C2 tunes the output range
desired. Two separate condensers can be
used for the sections of C2 if frequent
frequency changes are not anticipated.
4. A polar relay is included in the keying
circuit. With 30 rnA bias current supplied
from the exciter power supply, all that is
necessary for operation is to plug into the
local loop circuit. A turn over switch is
provided.
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The 0 -1 7 ·AR T -13 pta, available fro m F air
Radio for $4.00.
Allred G. Roach
W6JUK
ELECTRONICS
515 BLACKSTONE
FRESNO, CALIFORNIA 93701
O p erat ed bV Hems for Hems
85