I saw the English datasheet but I think the words "low frequency" is a bad translation from Japanese. A TIP31 has about the same output power at low frequencies but its fT is only 3MHz.The 2SC1162 is classed as a LF power NPN transistor with a "transition frequency" of 180MHz rated for 2.5A.
The output of 20V p-p is 7.07V RMS. The antenna is probably 75 ohms so the output power is 7.07V squared/75 ohms= 0.67W which is highly illegal in most countries.
The current in the coil and trimmer capacitor is peanuts.
That's true for recent datasheets. I have an old ITT databook where BD139 has a 250 MHz fT specification, which is well in the 2SC1162 range. I would expect a similar fT with newer BD139 types.BD139 is not recommended here because it is a general Purpose GP rated medium power transistor with no Spec for Transition Frequency, which I stated before is critical. You need at least 150MHz Try one of these, soldered to a copper ground plane.
No.BD139 is not recommended here because it is a general Purpose GP rated medium power transistor with no Spec for Transition Frequency, which I stated before is critical. You need at least 150MHz.
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