APPENDIX C 1278 ADJUSTMENT LOCATION MAP This is a map of the physical locations of the adjustment potentiometers on the 1278 circuit board. They are shown as they appear when looking down on top of the board with the board oriented so that the rear panel connectors are to the left. Information in the boxes is organized as shown below. ________________ ________________________________ | | | | | | PART MODE | | PART MODE H/L | PART MODE H/L | | | | | | | CALSET # | | FREQ / CALSET | FREQ / CALSET | | | | | | ----------------- --------------------------------- DEMODULATOR MODULATOR ________________ ______________________________ | | | | | | R113 HP | | R106 HP L | R77 VP H | | | | | | | CALSET 32 | | 2120 248 | 2100 250 | | | | | | ----------------- ------------------------------- | | | | | | R114 VB | | R122 VB L | R105 HP H | | | | | | | CALSET 32 | | 2125 248 | 2320 227 | | | | | | ----------------- ------------------------------- | | | | | | R79 VP | | R78 VP L | R119 VB H | | | | | | | CALSET 8 | | 1300 404 | 2975 177 | | | | | | ----------------- ------------------------------- | | | | | | R115 CW | | R138 SSTV H | R129 MCW | | | | | | | NO CALSET | | 1500 351 | 850 618 | | SEE NOTE | | | SEE NOTE | ----------------- ------------------------------- NOTES ON FOLLOWING PAGE NOTE! Separate procedure required to do alignment of CW demodulator center frequency. NOTE! MCW modulator tone is also used for SSTV transmission. However, CW receive through a narrow filter for HF CW operation will require the CW demodulator center frequency to be selected to align with the radio's filter passband. MCW operation on VHF FM will require that both stations have both the modulator tone and demodulator center frequency to the same frequency. Depending on the mode you feel is most important to you, a choice will have to be made that can adversely affect operation on the other modes (SSTV, MCW, or CW).