The ' L ' Match Basic Aerial Tuning Unit

Short Wave Listeners and Newly licenced H.F. Operators will love this easy-start antenna system !


This Aerial Tuning Unit should be good for 1.8 to 30 Mhz when a 132 feet longwire aerial is attached. It is suitable for transmitting as well as receiving. Peak the heard signal to get in the right ball park.


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Practical Construction Notes.
Use air spaced capacitor for transmitting. All types ok for reception.
A 12 way single pole switch can be used instead of a crocodile clip. Tap the coil 12 times if using a switch
The L match tuning section will match any length of wire that is greater than 1/4 wavelength at desired frequency.
Use very small values for VHF tuners .... try 15 pF and 6 turns at 1/4 inch diameter
The C / L circuit looks like a low pass filter.. It IS a low pass filter! unwanted frequencies ( spurious signals ) will roll off ! ( be filtered )


Below is an L Match constructed in a small aluminium box
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While every effort has been made to check this information for errors, I accept no responsiblity for any problems that may result from using this information