Double Balanced Diode Mixer
Pin 1 has blue dot on top side, or blue glass arrond the pin
Mixer SBL-1 and the IE-500 is used
They have about 4-5db loss at 14Mhz
The local osc input needs +7 dbm
Inside view of an SBL-1 mixer, I was unlucky to kill this one during my first transmit experiment,
The IF input can NOT accept more than +20dBm audio level.