Kenwood TS-120 (1979 – 1982)

A digital-display HF transceiver that put 100 Hz readout accuracy on the desk of the average ham. People still call it "built like a tank" forty years later.

Overview

The TS-120 is an amateur HF transceiver from Kenwood. Gear from the same company sometimes turns up under the Trio nameplate, and Trio appears alongside this model in period literature. It covers the classic HF ham bands in SSB and CW. It is all solid-state, which was still a selling point then. Kenwood's own documentation for the family describes an all solid-state, compact unit with a wide-band final stage that eliminates the need for peaking controls. That means band changes don't require a tuning ritual.

The number most owners quote is power. The TS-120 is documented at 200W PEP output. The TS-120S variant is input rated at 200W PEP on SSB with 160W DC on CW, dropping to 160 and 140W respectively on the 10-meter band. There is a competing claim of "30W output" floating around for the TS-120S, and a separate low-power variant, the TS-120V, is documented at 10W. Don't trust any single power figure for this family until you know which suffix you're looking at.

Beyond the wattage, the display is what stands out. It carries a 100 Hz digital readout, which was useful accuracy for its era and the kind of feature that separated a serious rig from a budget one. Owners who've serviced these units consistently praise the construction. One long-term user described it as a rig that performs alongside much larger stations, and specifically called out how easy it was to pull the VFO and work on it.

Key Features

100 Hz Digital Display

The digital readout resolves operating frequency to 100 Hz. You aren't squinting at an analog dial and guessing where you are on the band. For a transceiver of this class, that was a big step up, and it keeps the TS-120 easy to use for modern operators who are used to precise frequency information.

200W PEP Output (TS-120 / TS-120S)

The TS-120 is documented at 200W PEP output. The TS-120S is input rated at 200W PEP on SSB and 160W DC on CW, with the 10-meter band running slightly lower at 160W PEP and 140W DC. That's a real signal on the low bands, and it's the figure most sellers lead with. At least one source claims "30W output" for the TS-120S. That doesn't square with the 200W input rating and is almost certainly a mix-up between input and output power or between model variants. The 10W figure belongs to the TS-120V, the Japan-market low-power version.

SSB and CW Operation Across the HF Bands

The TS-120S covers SSB and CW on the 80 through 10 meter ham bands, plus WWV at 15 MHz for receive. The general TS-120 model is documented with 160-10 meter coverage and SSB/CW/AM modes, though other sources list only SSB and CW for the S variant. If you need AM, verify against the specific unit before buying. The documentation is not consistent on this point.

Built-in VOX, RF Attenuator, Noise Blanker, and RIT

The TS-120 has VOX for hands-free transmit switching, an RF attenuator for strong-signal conditions, a noise blanker for ignition and impulse noise, and RIT for fine receive tuning without moving your transmit frequency.

All Solid-State, Wide-Band Final

No tubes, no tuning peaks. The wide-band final stage means you can change bands without retuning the output. That was one of the reasons these rigs were popular for mobile and field work.

VFO Design

The TS-120 VFO oscillator was developed on the basis of the 15-820 and TS-520 VFO, and is physically smaller. During CW operation, the transmit frequency shifts approximately 800 Hz above the receive frequency. That's standard practice, but worth knowing if you're new to the rig.

Historical Context

The TS-120S is documented as manufactured from 1979 to 1982, and at least one owner dates their unit to 1980. The TS-120V, the 10W variant, is described as the low-power version of the respected TS-120 series, built for the Japan market. Contemporary descriptions place the family as an early-1980s entry-level low-power CW/SSB transceiver. "Entry-level" sits oddly against a 200W PEP rating and a digital display, so the label likely reflects market positioning rather than capability.

The family sits alongside a broader Kenwood HF lineup of the period, with related models including the TS-130, TS-180, TS-530, and TS-830. The TS-120's VFO lineage traces back to the TS-520, so the design didn't appear from nowhere.

Collectibility & Value

These rigs trade regularly. A search for "Kenwood TS-120" on eBay returns a steady stream of listings, and they show up on the used-equipment aggregators as well. Prices vary enormously with condition, and many listings are explicitly sold as untested or for parts. One buyer noted picking up a unit specifically to harvest circuit packs to bring another TS-120S back on the air.

Common issues are well documented. VFO drift is the classic complaint, and there's a known modification - changing component values and location in the VFO - that improves stability. Kenwood itself issued service bulletins for the TS-120S, including a final transistor replacement (bulletin no. 38, dated 10-7-1979) and an antenna input transformer replacement (bulletin no. 40, dated 12-7-1979), with production later than serial 080001 incorporating the change. The VFO-scale and S-meter area of the chassis reportedly runs warm in use, and the original panel bulbs are a known wear item. Owners have replaced them with wide-angle white LEDs, though the swap requires trimming the rubber mounting sleeve behind the VFO scale because standard LEDs are thicker than the original bulbs.

Spare parts surface with reasonable frequency: push-button boards, relay boards, and even original foot sets appear for sale. If you're buying, assume you'll be doing some work. If you're buying to restore, the ease of removing the VFO works in your favor.