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Example : To make a 4 turns loop as above you would need 2*4 equals 8 metres of 8 lead ribbon cable using end of lead 1 and 8 as ends of the loop , join ends of lead 2 and 3 , 4 and 5 , 6 and 7. Loops made of multi conductor cables in this way tend to have a very large capacitance between turns and in the worst case the loop will have a self resonance frequency below the desired frequency band. Even if the self resonance is above the desired band, the amount of external tuning capacitance is greatly reduced. When a wide ribbon cable is available, it can be a good idea to use only every other lead and let the intermediate leads floating to reduce the capacitance between turns. Paul OH3LWR ============================= Paul , Tnx for the above advice ,although for a loop made with flat multi ribbon to be tuned to 60 kHz , the self-resonance freq will highly likely be higher than 60 kHz . The ribbon I have is 15 leads wide ,hence for higher freqs I could leave out every other lead . Tnx again , this is good education . Frank GM0CSZ / KN6WH |
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