MFJ-916BN, 1.8-225MHz, 350-540 MHz DUPLEXER, N FEMALE AL-811X The "Vibration Pick-up Microphone" element

The "Vibration Pick-up Microphone" element is a Piezoelectric Accelerometer Microphone with impedance of 4

  Comes complete with 1/4 inch phono plug and cable

All it takes is some simple circuitry using less energy than a penlight bulb

Has MFJs Permanent Molecular Bonding Technology

MFJ-916BN, 1.8-225MHz, 350-540 MHz DUPLEXER, N FEMALE AL-811X The "Vibration Pick-up Microphone" elementThe MFJ 916BN duplexer is a series of inductance coils and capacitors that acts as a band pass filter. Your MFJ duplexer can be used two different ways. The duplexer combines the output of the HF VHF transceiver and the output of the UHF transceiver so that both transceivers can be connected to the same antenna. The duplexer can also be used to separate HF VHF transmissions from UHF transmissions so that one transceiver can be connected to two