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<\/a>Tom and Joshua making minor adjustments in the phasor room<\/p><\/div>\n
Tom and Joshua started fine tuning in the phasor room, while I continued trying to find what could be causing the 270 kw limit mentioned yesterday.\u00a0 I decided to check the tightness of all the RF (radio frequency) power connections inside the transmitter and to make sure there were no tools or packing materials left in the transmitter.\u00a0 It is possible that either of these could be the cause.\u00a0 I only found one connection, out of hundreds, that was loose and it could only be tightened less than 1\/4 turn.\u00a0 Result–no change in 270kw limit!<\/p>\n
<\/a>One bolt on the left side of the capacitor on the top right needed slight tightening.<\/p><\/div>\n
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Next, Daryl and I bypassed the antenna\/dummy load switch to see if that could be the source of the problem.\u00a0 Result–no change in 270kw limit!<\/p>\n
It was noticed that the new transmitter was showing that the dummy load was not as good a match as some of the antenna selections.\u00a0 I asked Tom, whose company manufactured this dummy load, whether it was adjustable.\u00a0 Tom said the it could, so we removed a side panel of the dummy load only to find the adjustment capacitor was not there!\u00a0 It seems the padded box containing the capacitor was not clearly marked as being for the dummy load, so it ended up being stored as a spare part.\u00a0 After Tom installed this capacitor, the matching and reflected power was considerably improved.\u00a0 Result–still no change in 270 kw limit!<\/p>\n
<\/a>When we opened the dummy load side panel the place where the tuning capacitor was supposed to be located was empty. Notice the hundreds of load resistors to each side.<\/p><\/div>\n
Tom and Joshua continued to fine tune the antenna system and managed to adjust all three patterns to within 2% of 50 ohms– a very good match!!<\/p>\n