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291 [2007/02/19 03:36] n5na created |
291 [2018/11/01 02:41] (current) n5na [Related Links] |
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| ====== Antenna Tuner Model 291 ====== | ====== Antenna Tuner Model 291 ====== | ||
| - | {{291.jpg?150|}} | + | {{291.jpg?150|}}{{291rear.jpg?170|}}{{291inside.jpg?150|}} |
| ===== Description ===== | ===== Description ===== | ||
| - | The Ten-Tec model 291 is a "T" network tuner rated for 200 watts. Two series capacitors and a shunt inductor are used to transform the complex impedance at the feedline of the antenna to 50 ohms for the transmitter. No SWR or power metering is provided. | + | The Ten-Tec Model 291 is a "T" network tuner rated for 200 watts. Two series capacitors and a shunt inductor are used to transform the complex impedance at the feedline of the antenna to 50 ohms for the transmitter. No SWR or power metering is provided. |
| The two capacitors used in the 291 are 1000 volt 50-250 pF variables connected in series with a 47 tap rotary inductor (0.5-24 uh) shunted to ground. This tuner can be used with a single 50 ohm coax input and output, or has a wing-nut lug for use with end-fed longwire antennas. Extra capacitance can be added externally to the back panel for increasing the matching range if desired. | The two capacitors used in the 291 are 1000 volt 50-250 pF variables connected in series with a 47 tap rotary inductor (0.5-24 uh) shunted to ground. This tuner can be used with a single 50 ohm coax input and output, or has a wing-nut lug for use with end-fed longwire antennas. Extra capacitance can be added externally to the back panel for increasing the matching range if desired. | ||
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| + | ===== Earlier Version ===== | ||
| + | {{:291alt.jpg?150|}} | ||
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| + | ===== Related Links ===== | ||
| + | *[[this>./webarchive/238a/index.htm|Archived Ten-Tec Web Page]] (Scroll to the bottom.) | ||
| ===== Specifications ===== | ===== Specifications ===== | ||
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| ***INPUT IMPEDANCE:** 50 to 75 ohms | ***INPUT IMPEDANCE:** 50 to 75 ohms | ||
| ***OUTPUT IMPEDANCE:** 10 to 350 ohms | ***OUTPUT IMPEDANCE:** 10 to 350 ohms | ||
| - | ***REAR PANEL CONNECTIONS:** Input, SO-239 Output, SO-239 and long wire | + | ***REAR PANEL CONNECTIONS:** Input, SO-239 Output, SO-239 and long wire terminal grounding bolt |
| - | terminal Grounding bolt | + | |
| ***INDUCTOR:** 47 tap, 18 gauge silver plated wire on 2" diameter powdered iron toroid | ***INDUCTOR:** 47 tap, 18 gauge silver plated wire on 2" diameter powdered iron toroid | ||
| ***CAPACITOR VOLTAGE RATING:** 1 kv. | ***CAPACITOR VOLTAGE RATING:** 1 kv. | ||
