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TEKK KS-960 Operator's Handbook Manual

Crystal controlled digital data radio
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Operators Handbook and Service Manual
TEKK KS-960 (KS-900N)
Crystal Controlled Digital Data Radio
This Manual is intended for use by both the Operator and the Service Technician and is
therefore divided into two logical parts. The operation chapter presents all the necessary
information to connect, adjust and place the radio in operation. The service chapter
provides all the necessary information and data to test, align, and repair the radio.
This document was included with the order of the KS-960. There is no copyright or any
other notice restricting distribution of this information. It is being presented here for
archival purposes. Please use this information responsibly.
Introduction

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  • Page 1 This document was included with the order of the KS-960. There is no copyright or any other notice restricting distribution of this information. It is being presented here for archival purposes.

  • Page 2: Performance Specification

    The KS-960 Series is available in a Low and High Band configuration. The suffix L and H indicate Low and High respectively. The Low Band radio is intended for operation between 430 and 450 MHz. The High Band version for operation between 450 and 470 MHz.

  • Page 3: Data Interface Connector

    (RSSI) Carrier Detect Level Voltage, CD Chapter 1 - Operation The KS-960 is a Half-Duplex UHF Transceiver with crystals controlling the Transmit and Receives Frequencies. Half-Duplex indicates that the radio can transmit on a frequency that is different from the receive frequency but can not RECEIVE and...

  • Page 4: Connections And Adjustments

    Signal out of the KS-960 is direct coupled and will have a DC component. Pin 4, Transmit Data IN In many Modems, the Data Out Signal used to Modulate the KS-960 is a fixed level. To allow for proper modulation of the KS-960 a level or deviation control, VR1, has been included.
  • Page 5 Most Modems provide a connection (Closer) to Ground to key the transmitter ON. The KS-960 PTT line may be stitched to ground via a switch, relay, or an NPN Transistor. There will be approximately +6 Volts DC on the PTT line in the open, key up, state. It is strongly recommended that Pin 2, the minus supply voltage line be used as the ground return for the PTT line.

  • Page 6: Chapter 2 - Service

    Once installed and placed in operation, a correctly adjusted and aligned KS-960 should provide years of trouble free operation. CHAPTER 2 - SERVICE Receiver, General The receiver is a double conversion superheterodyne with both injection oscillators being controlled by high quality crystals. The first injection signal is generated in a two transistor chain that multiplies the frequency of the third overtone crystal nine times.
  • Page 7 frequencies of 910 and 455KHz are produced. The 455 KHz signal out of the mixer, Pin 3, is selected by the 4 pole filter F3. After filtering the signal is reinserted via Pin 5, to the input of the internal high gain main IF amplifier and limiter. Following the IF amplifier is a Quadrature Discriminator type detector.
  • Page 8 volts via the Zener Diode D10. To insure very fast receiver recovery, the receiver +B buss is not switched off during transmit. TRANSMITTER, GENERAL The transmitter is a straight forward direct modulated FM transmitter delivering approximately 2 watts to a 50 Ohm load. The crystal frequency is multiplied a total of 27 times (3 x 3 x 3) before being amplified to the 2 watt level by the pre-driver, driver, and final transistors.

  • Page 9: Receiver Alignment

    50 uA panel meter connected to the RSSI line, a LED connected to the CD line and a switch connected to the PTT line. Receiver Alignment 1) Connect the KS-960 to the test jig, power supply, SINAD’er, linear detector, distortion analyzer, and the signal generator.
  • Page 10 2) Adjust the signal generator to receive frequency and set the output level to 1mV. Adjust the modulation to 1000 Hz(*) with a deviation of 3.5 KHz (*) Note: If the distortion analyzer uses a frequency other then 1000 Hz, adjust the modulation to that frequency.

  • Page 11: Transmitter Alignment

    THIS COMPLETES THE RECEIVER ALIGNMENT Transmitter Alignment 1) Connect the KS-960 to the test jig and to the 20dB directional coupler, notch filter, spectrum analyzer, counter and 50 Ohm power meter. 2) Close the PTT switch and note if transmitter output is indicated.

  • Page 12: Antenna Considerations

    This is natural and to be expected. 12) Connect the KS-960 via a very short piece of cable to the power meter. Connect the voltmeter to Pin 5 (the red wire) on the 6 pin connector CN1. Set the power supply to deliver 10 Volts as indicated on the Voltmeter.

This manual is also suitable for:

Ks-900n

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