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#6
March 25th 05, 06:23 PM
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In article stM0e.10352$Ax.4673@trnddc04,
"WA3LTJ" wrote: What is the easiest way to have the tuner measure the frequency? Should I just put a pre-scaler in front of a digital port and sum pulses over time? What do you think of this idea? Have the tuner control the transmitter. Use the combination to completely characterize the antenna across each band of interest. Then select the tuning "instantly" based on a large frequency-based lookup table. With enough table space, you could create a table for each antenna and each band. This assumes that none of the programmed antennas changes much over time. Andy WA3LTJ (remove the b's for address) Most of the autotuners use a Lookup table for "Instant Tuning" once a Frequency has been tuned previously. This causes a lot less wear on the Cap Contact Points. 1. Measure Freq by looking at period. 2. Lookup tuning canstants in table. If no data jump to tuning routine. 3. Set tuning constants and measure Reflected Power and Phase. If above Set Level jump to tuning routine. If below, end/shutdown. Run tuning routine at less than 5 watt level, will also save contacts. All you need is enough power to allow the period to be measured and for the Phase and forward and reflected power levels to be sampled. Bruce in alaska a autotuner betatester from way, way, back........ -- add a 2 before @ |
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