6T MMBFJ310 Mot F SOT23 uhf n-ch jfet J310 6U MMBFJ309 Nat F SOT23 uhf n-ch jfet J309 6V BCW65CR Zet R SOT23R npn 32V 0.8A 6V MMBFJ174 Nat F J174 p-ch jfet sw/chopper 6V2 PZM6.2NB Phi C SOT346 6.2V 0.3W zener 6V8 PZM6.8NB Phi C SOT346 6.8V 0.3W zener 6W BCW67CR Zet R SOT23R pnp32V 0.8A 6W MMBFJ175 Mot F SOT23 J175 p-ch jfet. Balanced Preamp - Power supply DGND V12 V5 1K5 R26P 470uF C21P 25V. In transmit mode, the relays serve to isolate the device and allow the transceiver to be connected directly to it’s antenna. The combined signal is then buffered by Q4 and sent to the receiver through a relay. Two J310 FETs then act to buffer and combine the two basic signals. All Details On JA310J (Japan Airlines B737-846) - Flight Information/airline information. 6A KA76L05 - Voltage Regulator 33V IN MAX, 5V out 4mA J310 NTE2902 N-Channel Silicon Junction, Field Effect Transistor KA2206 NTE1667 2.3 Watts per channel, Power Amplifier, Bridging will give 4.7 Watts KA2209 - Stereo Power Amplifier, 1W KA2284 NTE1561 5 LED VU Level Meter - 6-18V. We offer BIFET, Ultra Low Noise JFET, N Channel Switches, P Channel Switches, Low Leakage Diodes, Photo FET, Transistors, Voltage Controller Resistors and more!. (Having 50 feet of RG-58 between the transmitter and the preamp and its associated losses is also helpful in preventing damage.) A lower-noise transistor such as the J310 or U310 could be used instead, but there would be no improvement in performance while the rotation (antenna switching) is occurring - although weak-signal performance may be improved slightly when rotation is stopped and a "test" antenna is selected. The source follower has a low output impedance suitable for connecting to a coaxial cable. 
The amplifier also has an input capacitance, say 7 pF for J310 type J-Fets.
What we have here is a small antenna, typically one metre long and perhaps representing a capacitor of around 20 pF, feeding the high impedance input of a source follower amplifier.
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