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Summary of Contents for Ten-Tec 229
- Page 1 TEN-TEC MODEL 229 ANTENNA TUNER OWNER'S MANUAL Part # 74123...
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Page 3: Specifications
GENERAL The model 229 antenna matching unit is an adjustable reactive network used for matching the unbalanced 50 ohm output impedance of transmitters and transceivers to a variety of loads, either balanced or unbalanced. It will perform this function over a frequency range of 1.8 to 30 Mhz. -
Page 4: Operation
ANTENNA SELECTION A maximum of four antennas may be connected to the model 229 at one time, only one of which may be a wire fed antenna. Whether the antenna selected is matched or fed directly is determined by the setting of S1. - Page 5 0 - 2 KW. Measuring SWR is covered in step 8 above. CAUTIONS 1. In the normal operation of the Model 229 matching unit very high RF voltages and currents can occur at some points in the circuit. Be very careful if the tuner is ever used while the cover is removed.
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Page 6: Circuit Description
Figure 1 CIRCUIT DESCRIPTION The matching circuit used in the model 229 is basically an "L" network. The "L" network has several advantages over other circuit configuations. It has only two adjustable parts, one inductor and one capacitor; most other networks use three. Because there are no internal nodes in the network, the maximum circuit voltages and currents which occur are never are never more than those present at the input or output terminals. - Page 7 The Model 229 provides a coupling method to convert the resistive/reactive load to a pure resistance of 50 ohms that will accept maximum power from the transmitter. This is not to say that any and all antennas, when converted to a 50 ohm resistance impedance by means of a tuner, will give identical performance.
- Page 8 has the effect of cancelling out the reactance of the antenna, leaving only the 50 ohms resistive. This can be looked on as a series R,L,C circuit that is in resonance, whose total impedance is only that of the resistance. Another term for this approach to maximize power transfer is "conjugate impedance matching."...
- Page 9 given location should be flowing in the opposite direction to the current in the adjacent conductor, and if the system is well balanced, the amplitudes of the two will be equal. Under these conditions, the two sets of fields exactly cancel each other and very little radiation will result. If the two currents are not equal or not in exact opposite phase, there will be radiation.
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Page 10: Overall Summary
line, or drops slowly and uniformly along a line with losses. This is the matched condition, represented by a 1 to 1 SWR. The impedance at the load end of such a line is the same as that at the generator end. -
Page 11: Watt Meter Calibration
8. One special situation where the line does not alter the impedance is when its length is an exact multiple of the electrical half wavelength. 9. An antenna tuner will not affect the antenna impedance nor the standing wave condition on the transmission line. - Page 12 Replace only with a string of the same diameter. The elastic section provides string tension. Both are available from TEN-TEC. To install, remove the top cover and unplug the meter plug from the switch board. Remove the knobs and then the front panel.
- Page 13 TUNER CONFIGURATIONS -- Selected by S1 Figure 2...
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