Spindle to cam shaft ratios for small IF type coils seem the be 2: 1. This implies the wire feed mind traverses from a side to the other in a spindle emerging trend and traverses back during the next spindle trend. I don’t believe a Morris “Coilmaster” are capable of doing that. A 1: 1 spindle to camera shaft percentage means the wire feed brain traverses to a single area and back while in a single spindle innovation.

Tuning slug/mug fabric permeability may vary considerably (much like toroids) and Amidon lists permeabilities up to 35 for their slug tuned coil types. The .01 to .50Mhz “3″ material carries a permeability of 35. As an example: one particular 455Khz IF (which you would count on to have a high permeability slug) steps .7mH without a slug, 1.5mH (maximum) with it’s powdered steel slug and 2.5mH (maximum) with another powder metal slug from a JW Miller 100Khz IF (clearly using a greater permeability). A few of the physically modest coils, like those who work in 3/8″ containers use quite high permeability ferrite glasses to lower coil size demands.

When swapping tuning slugs for one you just had to drill out because it broke, make sure the permeabilities are about the same or it won’t tune correctly. Could by no means get that Heathkit HF osc to maximum….huh ? .

One way to obtain reduced volume, higher permeability slugs is older Television set horizontal osc coils. Scribe it with a hacksaw and snap it by hand if you need to shorten a powdered iron slug. A simple method for identifying comparable permeability is usually to swap slugs in a given coil measure and form the inductance.

If you are not using a coil winder, Coil spools solve the problem of the end turns “collapsing” on small coils, especially. The coil spools utilized are plastic-type “Singer” Type 15 (11/32″ large winding) or “PFAFF” (7/32″ high winding) sewing machine bobbins offered at any sewing retail store (or perhaps the wife’s sewing area ….but be cautious, they don’t share your passion). Coil winding while using wife’s sewing machine “bobbin winder” does not work and may reduce your lifestyle. A “Performer” Type 15 or “PFAFF” bobbin has a thicker central and lends alone to simply being drilled to 19/64″, 9/32″, or 17/64″ which allows them to be placed to regular 1/4″ slug tuned cores. Clip the spool with wire nippers and also, since it’s an outside curved benefit, a finger nail clipper works well. Trim the spools after you have wound them to keep the newly created rough edge from cutting small gauge wire or smooth the spool edge before winding. Cut them in half or make some “washers” if the spools are not the correct height. It’s important to protected these solidly towards the coil type or maybe the winding will often “go walking” the washer stops outward. When accomplished, carefully eliminate the washers and add some beeswax/Q dope to close the exterior turns.

To help keep the primary turns from dropping add a covering of dual sided adhesive tape to the key or drip some beeswax onto the core (favored).

Many types of magnet wire enable straight tinning of your wire which uses up away from the insulating material during this process. This is less difficult than scraping the insulation off with a razor blade, particularly for small gauges. Getting rid of the efficiency across a flame is not really recommended.

Aspect percentage is vital. A fixed period of wire was injury on a given slug and form. The coil winding level on a single was 3/8″ and 3/16″ about the other. The 3/16″ winding (larger external size) calculated 40Per cent (maximum) a lot more inductance. Therman says optimum inductance is achieved if the winding cross section is square. Slug tuned coils could be distinct.

To present the wire coilmaster more “put” as you are winding, give it across and right into a beeswax block (offered at art work/craft and sewing stores).