21-03-2018, 01:45 PM
(21-03-2018, 10:24 AM)VK3LU Wrote: Doug,
Is your RFC 10 millihenries or 10 microhenries?
Nev
I used 10mH (well that was what it was marked) - but a style suitable for RF, not audio - that I had on hand. The value is not critical so long as XL > 500 ohms at the lowest frequency in use (ie 1.8MHz) & that calculates out as about 50uH (=565 ohms).
XL = 2piFL
= 2 x 3.141592653 x 1.8 MHz x 50 uH
= 5.7E+02 ohms (to 2 significant digits)
= 565 ohms
Use anything from 47uH/50uH upwards in an RF style when working at a 50 ohm impedance.
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
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http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.