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Service bulletin no. 48 (9-8-1979) Some TS-120S users may complain of a hum during SSB operation, which may be caused by RF feedback.

There may be various reasons for this complaint. • Bad feedline and antenna system ground. • Poor Mic hookup or shielding. • Vertical antenna with poor or no radial system.

• For base operation with other than a PS-30 Power supply: Poor regulation and insufficient filtering in the supply. • Linear amplifier creating hi RF field near the operating position. • RF induced back into the power supply causing falsie protection (other than PS-30). • RF pickup by any cables to or from ancillary equipment.

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Prevention is the best cure. For those cases where all normal measures have been tried, try installing a.01uF bypass cap across the mic input jack between pins 1 and 4. Some AFSK operators may have similar RF feedback problems with TS-820S or TS-520S. Bypass the mic ground pin to the chassis, pin 3 to 4 and in extreme cases, install a ferrite bead on the Mic coax center conductor at the microphone connector.

Please annotate your service manual. TS-120S VFO Stability (Supercedes 7/9/79 bulletin) VFO drift characteristics may be improved by changing component values and location in the VFO.

This change applies to serial numbers before 00100001. Note: DO NOT disturb lead dress or component placement while working inside the VFO. Otchet laboranta visshej kategorii kdl. • Remove the VFO unit by four 3mm hex head bolts.

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• Withdraw out the front panel and unplug the leads. • Remove the VFO cover by 5 phillips head screws. • Remove C17, and C18 from the PCB. Thes may be cut flush to the board. • Reposition the Ground terminal for the Variabel Capacitor by heating the post and pushing it through to the opposite side of the PCB. • Install paralleled 10pF green and 18pF yellow caps from the bottom tank coil terminal (LH) to the modified Ground post. Position the caps near the coil, not the PCB.

Make certain the ground lead doesn't touch the coil or coil mounting. • To reassemble, perform steps 3,2,1. Snug all VFO case screws.

A later complaint of frequency jump would indicate a loose VFO shell. New Parts: 10pf CC45SG1H100J 18pf CC45RG1H180J Analog Dial Calibration: • Turn the main dial fully CCW. The red cursor should line up with the VFO mark on the sub-dial. If it does not, remove the main knob, loosen set screws and align the scale start point with the red cursor. • Turn the main knob to 50 kHz analog. Adjust the aluminum slip sub- dial to line up with any one of the larger black dial marks. • Note the digital error.

If it is MORE than 2 kHz adjust the VFO trimmer cap TC1 (center under the seal tape) to exactly 50.0 on the digital readout. • Turn the main knob to 450 analog. If the digital error is less than 2 kHz it is in spec. If the digital error is greate, proceed: For instance if the digital error is 14.454.0 (plus 4 kHz), multiply the error times 4 (16 kHz) and adjust the VFO trimmer cap to the desired frequency (14.450.0) less the error, or 14.434.0. Next adjust the VFO inductor L10 (front under the seal tape) back up to the desired frequency of 14.450.0.

• If the error in step 4 was in the minus direction, reverse the direction of correction adjustment in step 4. • VFO linearity final check: The digital readout and analog dial should agree to within +/- kHz at every 100 kHz dial point. TS-120S VOX operation pick-up time Author: Trio-Kenwood Communication, inc. Service bulletin no. 38 (10-7-1979) When ordering single replacement 2SC2290 Final transistors for the TS-120S, please specify the hfe rank, by color. When replacing pairs of finals, always select the same hfe randk for both transistors. Rank designation will be found printed on the transistor, directly under the transistor number.

Rank: R 30-65 O 55-95 Y 85-150 Please return all defective 2SC2290 finals to the attention of the TRIO- KENWOOD service department, along with the warranty claim form. TS-120S Ant Input Transformer Replacement Author: Trio-Kenwood Communication, inc. Service bulletin no. 40 (12-7-1979) Ts-120S transceivers subject to strong static fields or similar high current atmospheric discharges may suddenly exhibit low RX sensitivity on all bands.

TX will be OK. You may suspect T1 on the RF unit X44-1260-01. When replacing or ordering T1, L43-0696-35, also check the value of C20.

If it is 33pF, just replace and repeak the transformer. First production transceivers will have a 15pF cap for C20. When changing T1, also replace C20 with a 33pF capacitor, and repeak the circuit. Old part number: L34-0696-05 Antenna Coil New part number: L34-0696-35 Old Capacitor was 15pF, replace with New part number: CC45RH1H330J 33pf TS-120 Repair Notes.