The 500 meters 3DA87C frequency modulation amplifier making

500 meters selection of 3DA87C FM amplifier components: capacitor C2, C3, C4 are frequency ceramic capacitor, Ct 5/25P high frequency semi-adjustable capacitor, L for a diameter of 0.9 enameled wire 8mm
Around 6 turns on the tube the womb from then opened about 2CM center tap, transmitting antenna can be soft wire.
The actual launch less than 500 meters away.
The the 500 meters 3DA87C FM amplifier 3da87c To selected cutoff frequency high zoom multiples tube, common 9018 can also be used, but the firing distance is slightly affected.


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