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Realistic TRC 449

Realistic TRC 449 am ssb radio

uPD858c SSB Chassis

Manufacturer Model VCO Col Adj Transmit Bal Adj
REALISTIC
REALISTIC
REALISTIC
TRC-449
TRC-457
TRC-458
L17
L17
L17

L37
L37
L37

 

Broadbanding the uPD858c SSB Chassis

Broadbanding the upd858c Uniden Chassis 

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 SSB Chassis

upd858c SSB Chassis Clarifier Unlock

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 to
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 of slide.


Realistic TRC 449

Realistic TRC 449 ssb cb radio


RT301 (if present)-VDC Adj,
VR17-LED Brilliance,
VR15-Driver Bias,
VR16-Final Bias,
VR4-Carrier Bal,
VR8-AM PWR,
VR6&VR7-MIC GAIN/AMC,
VR12-TX Meter,
VR5-AM RX Gain,
VR2-RF Gain,
VR3-Sq Range,
VR1-S Meter, CT7-ALC>
TX Tune-up: L39, L37, L32, L30

Realistic TRC 449 diagram

trc449-by edsvintage

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