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OPERATE AT ABOUT 3 MHZ.  THERE ISNT ENOUGH TUNING RANGE TO COVER THE
COMPLETE ITU REGION 2 40 METER BAND, THOUGH FOR THOSE OUTSIDE THE USA, THAT
ISNT MUCH OF A PROBLEM.  THE PTO HAS ABOUT A 130 KHZ TUNING RANGE.  TO GET
THE RIG TO WORK DOWN IN THE US CW PORTION OF THE BAND, C4 IS REMOVED FROM
THE CIRCUIT.  THIS INCREASES THE OSCILLATOR FREQUENCY AND HENCE LOWERS THE
OPERATING FREQUENCY.  IF YOU WANT TO COVER THE ENTIRE 40 METER BAND, SOME
MEANS OF SWITCHING THE CAPACITOR IN AND OUT OF THE CIRCUIT WILL HAVE TO BE
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DEVISED.  I USED SINGLE IN LINE PACKAGE SIP HEADER PINS AND A SHORTING
PLUG.  THIS IS LABELED BSS BAND SEGMENT SELECT ON THE SCHEMATIC AND BOARD
LAYOUT.  SSB DETECTOR, GENERATOR AND IF MIXER THIS SECTION OF THE CIRCUIT
IS COMPRISED OF TWO SA602 MIXERS, A CRYSTAL FILTER AND A 74HC4053 ANALOG
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IW/343 G3VKW/350 JA1ADT/344 JH0BBE/342 DJ8NK/359 JA4JBZ/347 K4XO/363 N6JV/
354 VE7IU/342 W7XA/358 JA2BHG/364 KF8N/342 W4LK/347 DJ4GJ/343 G3VXJ/342 JA1
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