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General| Type | HF Transceiver |
|---|---|
| Operating Modes | CW, SSB |
| IF Filter | 2.4 kHz |
| Supply Voltage | 12V |
| Current Drain | Receive: 70 mA |
| Dimensions | 2.5" H |
| Weight | 2.5 lbs |
| Tuning Steps | 1 kHz |
| Receiver Type | Superhet |
| Kit Type | Available as a kit |
Information on how to get help with kit construction, operation, or troubleshooting.
Instructions for returning a completed kit for repair, including necessary information.
Describes the modular design, chassis construction, and printed circuit boards (PCBs) of the K1.
Precautions for handling ESD-sensitive components to prevent damage.
Guidance on identifying resistors and RF chokes using color codes and markings.
Instructions and recommendations for proper soldering techniques, including heat and solder flow.
Techniques and suggestions for removing components from double-sided PC boards.
Specific instructions for installing and soldering the relays (K1-K3) on the Filter board.
Step-by-step installation of capacitors for band 1 and band 2 on the Filter board.
Guidance on selecting the VFO range (80 kHz or 150 kHz) and recording the choice.
Instructions for installing the crystal resonator (Z1) and grounding crystals (X1, X2).
Detailed instructions for winding and preparing toroidal inductors (L9-L12) for the Filter board.
Instructions for installing multi-pin connectors (P1, P2, P3) on the Filter board.
Guidance on installing the microcontroller U1 and ensuring correct orientation.
Procedures for visually inspecting the Filter board and performing resistance checks on components.
Steps for installing the connector J1 and push-button switch S1 on the Front Panel board.
Installing remaining switches (S2-S6), resistors, capacitors, and IC sockets on the Front Panel board.
Installing transistors (Q1-Q2) and ICs (U2-U5) on the Front Panel board, noting orientation.
Installing hardware like standoffs and screws, and LEDs (D1-D2), ensuring correct orientation.
Inspecting the IC socket for U1 and installing the LCD display (DS1), noting fragile nature.
Performing visual checks and resistance measurements on the Front Panel board components.
Installing potentiometers (R1-R3) and attaching knobs, ensuring proper alignment and fit.
Inserting the Front Panel PC board assembly, attaching covers, and adjusting potentiometers.
Locating the RF board, identifying major areas, and installing 2-D fasteners.
Installing connectors (J6-J8) and relay (K1) on the RF board, noting proper orientation and alignment.
Installing connector P1 and placing resistors and capacitors on the RF board.
Installing diodes (1N4148, 1N4007, etc.) and varactor diodes, checking orientation.
Installing transistors (Q1-Q11) and ICs (U2-U5) on the RF board, checking orientation.
Performing DC voltage checks on various points after installing components on the RF board.
Installing various components like jacks, switches, crystals, and relays on the RF board.
Instructions for winding and installing toroidal inductors (L2, T1, T2) on the RF board.
Preparing side panels, installing thermal pads, and attaching them to the RF board.
Attaching side panels to the RF board and plugging in the front panel assembly.
Instructions for preparing and installing the RG-174 coax cable jumper (W1) on the RF board.
Basic initial tests including power supply connection and LED checks.
Testing and adjusting the sidetone generator and AF amplifier controls.
Instructions for testing the keyer paddle and iambic mode selection.
Steps for aligning the receiver, including setting BFO and checking signal strength.
Peaking the premix and RF inductors for band-pass filters on the Filter board.
Aligning the BFO using the trimmer capacitor C20 for approximate signal pitch.
Fine-tuning the BFO to match the sidetone pitch for optimal audio alignment.
Calibrating the operating frequency display by matching it to a known signal.
Testing the Automatic Gain Control (AGC) and S-meter display functionality.
Installing capacitors and resistors on the RF board, noting orientation and values.
Installing diodes (1N4753, 1N4007) and RF chokes (RFC2, RFC5) on the RF board.
Installing transistors (Q6, Q7) and toroidal transformers (T3, T4) on the RF board.
Performing resistance checks on components of the RF board to verify correct installation.
Steps to prepare the K1 for transmit alignment, including connecting dummy load and keyer.
Aligning the band-pass and low-pass filters for band 1 using TUNE mode.
Aligning the band-pass and low-pass filters for band 2 using TUNE mode.
Testing the transmitter's 5-watt power output capability on both bands.
Adjusting the transmit offset pitch to match the sidetone pitch for proper operation.
Installing the speaker cable and connecting it to the RF board and speaker.
Placing and securing the top cover, and attaching self-adhesive feet to the bottom cover.
How to connect power supply, headphones, external speaker, and keying devices.
Guidance on connecting and using antennas with the K1, including tuner options.
Explanation of the front panel controls, LCD display, and LEDs.
Explains the TAP and HOLD functions for each switch on the front panel.
Description of the VFO operation and the function of AF GAIN and OFFSET controls.
How to select different crystal filter bandwidths using the FLx menu.
How to configure the K1 for the installed filter bands using the Bx menu.
Procedures for calibrating the operating frequency display and testing the VFO.
How to calibrate the S-meter for zero and full-scale readings.
Guide to setting up the transmitter, including power output, TUNE mode, and keyer test.
How to use the keyer test mode to practice sending code without transmitting.
How to select different keying devices (paddle, hand key, computer) using the INP menu.
Configuring the keyer speed, iambic mode, and using keyer test mode.
How to control the Automatic Gain Control (AGC) for receiver performance.
Overview of optional modules like Filter Modules, Tilt Stand, Noise Blanker, Tuner, and Battery.
General description of the K1's design, capabilities, and signal path.
Detailed explanation of the microcontroller, LCD, and other circuits on the front panel.
Explanation of VFO, mixer, and filter circuits on the RF board.
Explanation of the filter module's components, band-pass filters, and crystals.
Explanation of transmitter circuits, including driver, power amplifier, and T-R switch.
General steps to follow when troubleshooting K1 problems, including checking power and components.
Specific troubleshooting steps for general problems like dead unit, LCD/LED issues, or incorrect voltages.
Troubleshooting steps for problems related to the display, controls, and regulated voltages.
Troubleshooting steps for VFO and premixer circuit issues, including frequency drift and tuning.
Troubleshooting steps for receiver problems like low audio, signal loss, or AF amplifier issues.
Troubleshooting steps for transmitter problems like low power, fluctuations, or keyer malfunctions.
Description and schematic for building a simple RF probe for signal tracing.
Step-by-step guide for signal tracing in the receiver and VFO circuits.
Step-by-step guide for signal tracing in the transmitter circuits.
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