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238 [2007/02/19 03:43] n5na |
238 [2019/03/03 21:13] (current) n1eu [Mods & Tips] |
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| ===== Description ===== | ===== 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. | 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. | ||
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| + | ===== Reviews ===== | ||
| + | *[[http://www.eham.net/reviews/detail/212|eHam]] | ||
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| + | ===== 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) | ||
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| + | ===== Additional Information ===== | ||
| + | *[[t_vs_l|Explanation of "L" Network vs. "T" Network]] by Scott Robbins, W4PA | ||
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| + | ===== Brochures ===== | ||
| + | {{238brochure.jpg?100|}} | ||
| ===== Specifications ===== | ===== Specifications ===== | ||
| - | ***CIRCUIT TYPE:** Modified "L" Network | + | ***Circuit Type:** Modified "L" Network |
| - | ***RF POWER RATING:** 2000 watts | + | ***Maximum RF Power:** 2000 watts with a load impedance of 3000 ohms |
| - | ***FREQUENCY RANGE:** 1.8 to 30 MHz | + | ***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 | + | ***Output Matching Range:** At least 10:1 SWR, any phase angle. |
| - | ***INPUT IMPEDANCE:** 50 ohms, nominal | + | ***Maximum Impedance, Balanced Feedline:** 500 ohms |
| - | ***CAPACITOR VOLTAGE RATING:** 3500 volts | + | ***Input Impedance:** 50 ohms, nominal |
| - | ***INDUCTOR:** 18 uh silver plated roller inductor | + | ***Input/Output Connectors:** Input and four antenna coax connectors are SO-239, UHF type. Studs with wing nuts for single wire and balanced feeders. |
| - | ***SIZE:** HWD (in inches) 5.5 x 13 x 11 (14x33x28 cm) | + | ***Variable CAPACITOR VOLTAGE RATING:** 3.5 kV |
| - | ***WEIGHT:** 10 lbs (4.53 kg.) | + | ***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.) | ||
