standard oscillator t o produce a voltage to control VCO (vol- tage controlled oscillator). It also forms a full electronic IF sh~ftloop using an external carrier signal. The VCO unit is

. composed of FET type osc~llatorsfor each band. buffer am- p l ~ f ~circuite. and the oscillator shut off circuit at the time of fault of the PLL circuit. The oscillator frequency is controlled

iby the control voltage from the PD Board. The bands of both units can be selected by means of the diode sw~tches.

Counter Ass'y Unit

COUNTER A S S ' Y U N I T (OPTION) IX60 - 1020 - 00)

This unit is composed of the counter mixer board that produces operating frequencies by mixing the VCO output (local oscillator stgnal for the mixer) with carrler signal, and the counter board that counts the frequencies in d~gits. These units are housed in a r~gidshielding case. Since the frequencies are read by synthesizing all the local oscillator stgnals, accurate operating frequencies are always counted under any operating conditions. The counter output is pick- ed up as a signal to dr~vethe indicating tubes and is fed to the d~splayunit.

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Kenwood TS-820 manual Counter Assy Unit
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TS-820 specifications

The Kenwood TS-820 is a high-performance amateur radio transceiver known for its exceptional features and technologies that cater to both novice and experienced operators. This rig, part of Kenwood's renowned TS series, has become a popular choice for those seeking reliability and versatility in their communication equipment.

One of the defining characteristics of the TS-820 is its dual-conversion superheterodyne receiver architecture. This design minimizes interference and provides improved performance across various amateur radio bands. With coverage from 160 meters to 10 meters, the TS-820 is capable of operating on all major HF amateur bands, making it an excellent choice for diverse communication purposes.

In terms of power, the TS-820 delivers a solid output of 100 watts, ensuring that operators can make their presence known across the airwaves. The rig features a built-in automatic antenna tuner, which simplifies the setup process by matching the transmitter to various antenna types. This feature not only enhances signal clarity but also maximizes the station's efficiency.

Another standout feature of the TS-820 is its extensive digital signal processing (DSP) capabilities. The advanced filtering options help to eliminate noise and interference, allowing users to hear weaker signals more clearly and effectively. The IF filter selections can be adjusted to optimize reception under varying conditions, showcasing the rig's adaptability.

The user interface of the TS-820 is designed for both ease of use and functionality. The large, backlit display provides critical information at a glance, while the rotary controls offer tactile feedback, allowing operators to make precise adjustments quickly. Additionally, the rig supports various modes of operation, including SSB, CW, and RTTY, accommodating a wide range of communication preferences.

Built with durability in mind, the TS-820 utilizes high-quality components and construction techniques that ensure long-term reliability. Its rugged design can withstand the rigors of everyday use, making it a trustworthy companion for any amateur radio enthusiast.

In summary, the Kenwood TS-820 is a versatile and reliable amateur radio transceiver that stands out due to its superior performance, advanced technologies, and user-friendly features. With its robust design and comprehensive capabilities, the TS-820 continues to earn its place as a respected choice among ham radio operators around the world. Whether engaged in casual conversation or competitive contesting, enthusiasts can rely on the TS-820 for a satisfying and immersive amateur radio experience.
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