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Re: T-4X alignment
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No, the rotor contact of the switch wafer.? The reasoning is to not have the various adjustments interact with each other.? You want the broadest possible tuning. Using a screwdriver was probably the best way in 1965 when they first came up with this procedure.? Since then, many things have changed -- including affordable test equipment that our peers would have drooled over 60 years ago. One of the minor things that got invented since then was the EZ Hook.? I have a bunch of them for jumpering things and such and they are a much safer way of detuning each section as you go through the procedure.? I just leave the other end somewhere where you can't touch it. The only part of the adjustment that needs this are the parts where the front two caps are adjusted. When you adjust the second-from-front trimmer, you detune the front one, and vice versa. I solved the insulated screwdriver issue a long time ago by using a regular, small flat-bladed screwdriver and putting a length of shrink tubing over all but the last 1/16" or so of the shaft.? That way, you have a tool that can torque a mica trimmer without bending the blade but also without shorting said blade to the holes through the chassis. BTW, checking the higher bands at the recommended frequencies may reveal that your finals are better than you think.? That's pretty good output on 20m. Pay attention to the frequencies where each band is set up.? These are set where they are to give the best output across each band.? Most of the bands are set up in the phone portions.? Ten is done at what was the bottom of the phone band and 160 is done at 1900.? Eighty is set up at 3700. If any of your adjustments seem to max out a trimmer, then you can measure the slug heights.? I wouldn't bother, otherwise, as long as all of the slugs are at the same height, relative to each other. The best way to check that is to turn the drive until the slugs are just at the top of the coil forms.? They should all be at that height.? I have only ever seen a properly-adjusted transmitter with different-height slugs on the earliest of the T-4, T-4X and R-4 sets and that was corrected pretty early on. If you need to set a trimmer past max "tight", try moving the rack down (i.e., more inductance) slightly and try again.? If the trimmer is past minimum capacitance, try reducing inductance.? You can only do this a little bit at a time without losing the tuning entirely.? It's more important to have the trimmers set somewhere away from the extremes of their ranges. This is probably more than you asked for but I've done lots of these and once you get the hang of them and know which parts of the procedures you can change (such as using a scope for carrier balance adjustment), they become second nature. 73, Steve Wedge, W1ES/4 Time flies like an arrow.? Fruit flies like a banana.
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On Thursday, April 4th, 2024 at 12:44 PM, Stan Gammons via groups.io <buttercup11421@...> wrote:
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