10 METER 1 KW AM STATION
- The 10 meter AM station consists of a
modified Motorola
250W 25 - 50 Mhz, FM Base Station.
- The complete base station is
contained in a (6) six foot black rack cabinet,
is fully metered, and another really
- heavy piece of communications
equipment. All of the active components are
tube type equipments. They consist of
- a 25 - 50 Mhz exciter which was FM,
modified to be a CW (Class C) frequency
generation unit, which has a pair of
- 2E26 tubes in the final stage to
provide 30 watts of drive to the Final
Amplifier. A 25 - 50 Mhz FM receiver which
- was converted to AM reception. Power
supply to run both the exciter and
the receiver in continuous commercial
- service (Class C) without straining.
- The final amplifier is a pair of 100TH
Triode tubes running in Class C with 2500 VDC on the plates.
- The output section has a split stator
tuning capacitor, rated for 5KV and a heavy coil with link coupling
adjustment.
- The 100TH tubes are cross
neutralized for 10 meter stability.
- There is also link coupling tuned
input in the grid circuit
of the tubes.
- The modulator is also a pair of 100TH
Triode tubes that get bias voltage
from the exciter/receiver power supply,
- and high voltage from the Base
Station High Voltage supply. The high voltage supply has a power
transformer
that provides 2500 VDC
- to the final amplifier and the
modulator tubes,
and consists of a pair of 3B28 rectifiers and the filter system has an
11 Hy. choke and (2)
- 16 uF 4000 VDC filter caps. The high
voltage supply
provides 2500 VDC to the final at 400 MA. and 2500 VDC at 200 MA. to
the
modulator tubes.
- The exciter has the frequency
modulation circuitry disabled, and frequency
agility is accomplished using the "SHOP"
- signal generator which is a computer
controlled PTS-250 signal generator
which has programable output from 0 - 1
- watt RF output and 0 to 250 Mhz, it
uses the "SHOP" frequency standard
which is a 10 Mhz standard which has an
- accuracy of a part in 10 to the 6th.
- The receiver has an AM detector added
and AGC/AVC circuitry, and utilizes
the PTS-250 signal generator for
- frequency control as well.
Sensitivity is very fine on 10 meters and I've
had lots of contacts running this Rig.
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