====== Antenna Tuner Model 238 ======
{{238.jpg?150|}}

===== Description =====
Modified, reversible "L" network matches broad range of impedances with no false resonances.  Handles 2 KW max.  Built-in lighted meter (external 12 VDC required) monitors forward power on 200 or 2000 watt scales and SWR.  Four position antenna switch for coax, single wire, or balanced line using built-in balun.

===== Reviews =====
  *[[http://www.eham.net/reviews/detail/212|eHam]]





===== Mods & Tips =====
  *[[238dialcord|Dial Cord Replacement]]
  *[[238no12v|Eliminate the Need for 12v]] or Unlimited Bulb Life!
  *[[http://n6ie.com/Ten_Tec_238.html|N6IE High Power Improvement Mod]]
  *{{238turns.jpg?100|}} Many owners have replaced the dial cord with various turns counters (MFJ-TC12 used here by Tom K0SN)

===== Additional Information =====
  *[[t_vs_l|Explanation of "L" Network vs. "T" Network]] by Scott Robbins, W4PA



===== Brochures =====
{{238brochure.jpg?100|}}

===== Specifications =====
  ***Circuit Type:** Modified "L" Network
  ***Maximum RF Power:** 2000 watts with a load impedance of 3000 ohms
  ***Frequency Range:** 1.8 to 30 MHz
  ***Output Matching Range:** At least 10:1 SWR, any phase angle.
  ***Maximum Impedance, Balanced Feedline:** 500 ohms
  ***Input Impedance:** 50 ohms, nominal
  ***Input/Output Connectors:** Input and four antenna coax connectors are SO-239, UHF type.  Studs with wing nuts for single wire and balanced feeders.
  ***Variable CAPACITOR VOLTAGE RATING:** 3.5 kV
  ***Inductance:** 28 uh silver plated roller inductor
  ***Size:** HWD (in inches) 5.5 x 13 x 11 (13.9 x 33 x 27.9 cm)
  ***Weight:** 9 lbs (4.1 kg.)