Sunday, March 18, 2012

Ten-Tec Model 238C HP Antenna Tuner



Description

Model 238C now features a large cross-needle SWR and peak reading power output meter. Model 238C uses our tried and true “L” match design used in the earlier 238/238A/238B models with a new cosmetic design, larger heavy duty tuning capacitor than the original and backlit cross-needle SWR and peak power output metering. The 238 was rated the LOWEST INSERTION LOSS of any high power antenna tuner available by the ARRL Lab in their survey article comparing the Amateur Radio tuner market (QST 2/03).

Specifications:

    • CIRCUIT TYPE: Modified “L” Network
    • RF POWER RATING: 2000 watts

FREQUENCY RANGE: 1.8 to 30 MHz

    • OUTPUT MATCHING RANGE: At least 10:1 SWR, any phase angle,
    • 1.8 to 30 MHz. 3000 ohms maximum at full power.
    • INPUT IMPEDANCE: 50 ohms, nominal

CAPACITOR VOLTAGE RATING: 3500 volts

  • INDUCTOR: 18 uh silver plated roller inductor
  • SIZE: HWD (in inches) 5 x 12.125 x 13.5 (12.7 x 30.8 x 34.3 cm). Depth measurement includes rear panel connectors.
  • WEIGHT: 16 lbs. (5.45 kg)

source; http://www.tentec.com/Link

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HOW TO READ PROPAGATION NUMBERS

The A index [ LOW is GOOD ]

  • 1 to 6 is BEST
  • 7 to 9 is OK
  • 11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Ap-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

  • 70 NOT GOOD
  • 80 GOOD
  • 90 BETTER
  • 100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of 60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

  • 0 or 1 is BEST
  • 2 is OK
  • 3 or more is BAD
  • 5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet) over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

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