||VCO Col Adj
||Transmit Bal Adj
Broadbanding the uPD858c
1. Locate L37 - Transmit Balance
Adjust. Perform the modification above.
Be sure to completely isolate the pins. Place the jumpers as shown.
Keep these jumpers as short as possible and use only an isolated soldering
iron. Then adjust L37 for balanced output power coverage between your
highest and lowest channel. You may have to settle for a little less power
on one end on some units.
Clarifier broadband for uPD858c
1. Cut D30 as shown and jumper D29.
2. Cut R 119 as shown and add the jumper to D44.
3. Trace the purple & white wire from the clarifier to where it connects
the circuit board and cut it loose. Re-solder this wire to the circuit
board ground. This should give you about 3 KHz down and 1 KHz up
Realistic TRC 449
RT301 (if present)-VDC Adj,
VR5-AM RX Gain,
VR1-S Meter, CT7-ALC>
TX Tune-up: L39, L37, L32, L30