WW8J Link Coupled Tuner Coil Design
From VE3ERP Hamcalc Software Program
W4RNL Recommended Link Coupled Tuner Component Values
I have had several requests for design information of the LCT plug-in coil sets. I would like to say that the design I have chosen is based upon the layout of the tuner, as well as readily available materials (including coil forms) and components on hand, as well as the 0.25" copper tubing used for the inductors L1 & L2 coil sets.
It is not necessary to clone the coil design specifications shown below in order to achieve the same values. For example, a coil set for 40 meters, L2 with a True inductance of 12uH could be wound with 7 turns of 0.25" copper tubing on an 8.0" form in order to provide an approx. 12 uH value for L2. This particular coil would not work with my tuner design because the male plug-in pins would not align to the female mounting receptacle. The physical properties of any given value inductor can be manifold.
In my design, the 12 turns of 0.25" copper tubing for L2 (40 Meters) was chosen to accommodate the length of the female plug-in support. In fact, the length of all three coil sets vary from approx. 6.0-9.5 inches. You may have a different layout for your tuner, or may desire a different value for coil Q, and therefore the use of the free Hamcalc software program would be valuable in designing your coil sets. In the design of each of my coil sets, I have found that the derived Hamcalc software arithmetic values matched very closely the actual measured inductance meter values of the finished coil sets.
You do not need an inductance meter to build these coil sets! The information given in the tables below was derived from Hamcalc software available from George Murphy VE3ERP, and was used in the design of the Link Coupled Tuner shown on the previous web page.
As previously mentioned, this tuner was designed for 160 - 20 meters The specifications below do not include the 20 meter coil. I will be publishing the 20 meter coil specification at a later date.
WW8J Link Coupled Matching Network Specifications
40 meter Link Coupled L1 – L2 COIL SPECS
80 – 75 Meter Link Coupled L1 – L2 COIL SPECS
160 meter Link Coupled L1 – L2 COIL SPECS
Page last updated on 01/18/2011
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