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#1
November 26th 07, 02:26 PM
posted to rec.radio.amateur.homebrew
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For Sale -Home brew balanced line tuner - Twin Roller Inductors
Hi, Bob.
Care to tell us what frequencies,antennas and types of feed lines you have used the tuner on? Have you ever put RF ammeters in the feed line to see if it's really balanced? Did you gear drive or chain drive the two coils? Looks like a nice job! =============== To check whether the feed line is truly balanced also depends on the symmetry of the antenna. Any 'unbalance can best be determined by clamping a RF current sensor/meter across both feed lines at the same time, not by measuring the difference between the 2 lines. Frank GM0CSZ / KN6WH |
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#2
November 26th 07, 08:35 PM
posted to rec.radio.amateur.homebrew
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For Sale -Home brew balanced line tuner - Twin Roller Inductors
On Nov 26, 6:26 am, Highland Ham
wrote: Hi, Bob. Care to tell us what frequencies,antennas and types of feed lines you have used the tuner on? Have you ever put RF ammeters in the feed line to see if it's really balanced? Did you gear drive or chain drive the two coils? Looks like a nice job! =============== To check whether the feed line is truly balanced also depends on the symmetry of the antenna. Any 'unbalance can best be determined by clamping a RF current sensor/meter across both feed lines at the same time, not by measuring the difference between the 2 lines. Frank GM0CSZ / KN6WH Hi, Frank. I was just curious to see if Bob ever posted anything other than "for sale" items. Guess not. Just looking at the pictures I would guess the tuner doesn't work as described. I will keep my old Dentron. 73's Paul, KD7HB |
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#3
November 27th 07, 12:40 PM
posted to rec.radio.amateur.homebrew
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For Sale -Home brew balanced line tuner - Twin Roller Inductors
Hi, Frank. I was just curious to see if Bob ever posted anything other than "for sale" items. Guess not. Just looking at the pictures I would guess the tuner doesn't work as described. I will keep my old Dentron. 73's Paul, KD7HB It is a good size example of Rich's tuner design... Probably works.. Is not a balanced tuner, however... It is a pair of of unbalanced L- match's with a common mode input choke... denny / k8do |
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