I Need Help - AI Part 2305

Prompt: A few questions and comments first. The PVC pipe must be maximum 7 inches long to fit in the box. I shortened it to 6 from my previous design because all of the tap wires were going to be coming out of the ends. I was intending to drill holes at the tap points and run the tap wires down the middle of the pipe. By using 22 AWG insulated, I can forget the holes and carefully solder the taps and run the tap wires directly 1 or 2 inch wires to the banana jacks. This allows me to increase the coil length to 6 inches if need be.

Abandoning the internal wire routing is a massive upgrade for the electrical performance of this build.

Running your tap wires straight off the surface directly to the banana jacks is exactly how laboratory-grade adjustable inductors are built. Here is why this pivot solves multiple problems at once:

## 1. Eliminating the Internal Capacitance Trap

If you had drilled holes and run the tap wires down the hollow center of the PVC pipe, those wires would have been sitting dead center inside the coil's magnetic flux field. As frequency climbs, those parallel internal wires act as capacitive plates coupling to the outer coil windings, creating unpredictable resonant traps and destroying the coil's "Q" (efficiency).

Running the tap wires externally at a 90-degree angle for 1 to 2 inches cleanly breaks them out of the magnetic field with near-zero parasitic interference.

## 2. The Silicone Advantage

Soldering mid-span taps onto PVC-insulated wire is usually a nightmare because the heat of the iron melts the jacket, causing it to shrink back and expose bare copper. The Striveday silicone wire is highly heat-resistant. You can use a hobby knife to carefully shave a tiny window in the insulation at your exact tap point, tin the solid 22 AWG core, and attach your 1-inch tap wire without melting the surrounding jacket.

## 3. Expanding the Canvas to 6 Inches

Taking advantage of that extra inch of space gives you an excellent safety net for Band 2.

If we use the 1.5 mm to 1.6 mm estimated outer diameter for the 22 AWG insulated wire, a tightly wound 6-inch (152.4 mm) continuous section gives you room for roughly 95 to 100 turns.

Having ~100 turns available (as opposed to ~80) guarantees you will have enough inductance to pull your 35-foot antenna down to the 1.6 MHz bottom edge of Band 2. If you don't end up needing those outermost M4/P4 turns, you simply bypass them on the plug-board. It is always better to have the copper and not need it than to fall short on inductance and not be able to tune the lower frequencies.

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Last modified: Wednesday, 29 Jul 2026