Note
he Palstar AT1KM is a 1200-watt impedance matching network designed to provide both balanced and unbalanced output. It features a T-type circuit configuration that utilizes a dual-stator differential variable capacitor to simplify operation by reducing the number of control knobs and eliminating false peaks during tuning.
Key Features
– Power Handling: It is designed to handle up to 1200 W PEP SSB or 800 W single tone continuous.
– Precision Tuning: The unit includes a 24 µH precision roller inductor wound on a steatite ceramic core, operated via a crank handle with a gear-driven mechanical counter.
– Differential Capacitor: Features a 440-0-440 pF (3 kV) differential capacitor equipped with a 6:1 precision vernier drive for accurate adjustments.
– Integrated Metering: A dual-movement cross-needle meter displays both forward and reflected power, allowing for real-time SWR measurement where the needles intersect.
– Output Versatility: The tuner includes a front-panel rotary switch to select between Coax 1 (tuned or bypass), Coax 2 (tuned or bypass), a dedicated Bypass, or Balanced Line/End-Fed Wire outputs.
Specifications
– Frequency Coverage 1.8 — 30 MHz
– Power Maximum 1200 W PEP SSB, 800 W single tone continuous
– Impedance Range 20 to 1500 Ω 160 m to 10 m (assuming resistive
load) Reduce power for lower Z range
– Balanced Output 4:1 Ruthroff voltage type balun
– Input Tuning: Dual-stator differential capacitor (440 - 0 - 440) pF, 3
kV) with 6:1 precision vernier drive Inductance 24 μH roller inductor; #12 wire wound on steatite ceramic core, silver plated bar/wheel.
– Antenna Selector Switch 6 position:
Coax 1 tuned and tuner bypass
Coax 2 tuned and tuner bypass
Bypass and balanced antenna
– Switch wafers are ceramic (3kV rated)
– Power Range Switch 2 position 300 W /3000 W
12 VDC Input Adaptor for meter light 2.1 mm con. (center positive)
Other
Materials Chassis and top cover is 11 ga. (.090) aluminum
that has been chem.-film treated in gold color. Front
Panel powder coated and epoxy screened
