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QST Magazine Product Reviews - Key Measurements Summary - HF-Transceivers or Receivers. Compares Yaesu FTDX5000, Elecraft K3, Flex 5000 and Kenwood TS-590S

VE2ZAZ and distorted audio in SSB on some models prior 2006

Demonstrates how to construct an automatic band decoder, moving beyond manual selector switches for antenna and filter control. It addresses the challenge of varying band data outputs from different transceivers: Icom rigs provide voltage values, Yaesu rigs use Binary Coded Decimal (BCD), and Kenwood rigs lack direct band data output. The resource highlights a clever solution utilizing logging software like _CT (K1EA)_ and _DX4WIN_ to emulate Yaesu's BCD output via a PC's printer port, making the decoder compatible with any rig. The author details experiences building decoders based on designs by Bob _K6XX_ and Guy _ON4AOI_, noting K6XX's simple TTL chip design and ON4AOI's more comprehensive, opto-isolated unit capable of controlling ten outputs and bandpass filters like the _Dunestar_. It also references a _W9XT_ board design, which Steve Wilson, G3VMW, modified with BD140 transistors for source drivers, emphasizing safety. The author successfully cased an ON4AOI-based decoder in an old modem case, connecting it to an FT1000MP or a PC printer port to drive remote relays and a Dunestar Band Pass Filter.

tkD7 is an expectk script for controlling the Kenwood TH-D7 HT on Linux or FreeBSD

Rigpix page for Kenwood TS-590S

The Kenwood TS-570D(G) transceiver (I), by Thierry Lombry, ON4SKY

Reduces line noise on TS-850

SS232K - The simple and safe RS232 interface for Kenwood radios

The lithium battery problem in the Kenwood TS-570

Problem width the memories, TS-570 Batteries, MARS/CAP Modification

TM-241A RX/TX mods The TM-421 a is capable of transmitting from 136 to 174 MHz when the following modification is performed

1500 watts PEP output from a Kenwood TL-922 amplifier requires careful attention to parasitic suppression and component selection to ensure stability and longevity. This resource critically examines common modifications, often based on anecdotal evidence rather than sound engineering principles, that can degrade performance or introduce new issues. It highlights how replacing aged components often gets misattributed to the efficacy of unnecessary modifications, leading to widespread misinformation within the amateur radio community regarding amplifier stability. The article details specific, effective modifications for the TL-922, such as shortening anode-to-chassis and anode-to-grid paths to improve VHF stability and efficiency. It addresses issues like incorrect capacitor types in the tank circuit, inadequate grid grounding, and poor RF sheet metal design, providing practical solutions like adding direct ground connections for the plate tune variable capacitor. The author also discusses proper parasitic suppressor design, emphasizing the importance of lead length and component selection for optimal performance and harmonic suppression, contrasting these with less effective or detrimental 'magical suppression kits'.

Pics and specifications

Large picture and specifications

radiomods.co.nz modifications for the Kenwood TS-450

Kenwood TH-D7(G) and TH-D7A commands reference

TS-570 series specifications at universalradio

Kenwood TS-590S features, accessories, specifications and details

Kenwood TH-D7a TX band modification

Modifications for the Kenwood TS-870S

PDF File of the Kenwood TM-710A user manual

RigPix Database: Kenwood TS-50, pic and specifications, link to user manual

This mod flattens out the ACC2 audio input low frequency response

WR1B review of the Kenwood TS-570D on QST Jan 1997

Used in the Kenwood TM-241, TM-741 2m module by W3KKC

How to connect and key Power Amplifiers to Kenwood TS 590 or TS 990. How to home made custom Remote cable to key power amplifiers by JG1VGX

9600 Baud modification on the Kenwood TM441 by ON6MU

PTT and souncard interface for the kenwood TM255 and TM455

Wiring a Balanced Microphone to the TS-590S Unbalanced Microphone Input

link7 is a Windows 9X program to download/upload data from/to the Kenwood TH-D7.

Kenwood TS 990S, Military Auxiliary Radio System modification

CQHAM.ru page about the Kenwood TM-241

How to take the IF from a Kenwood TS-480

The TS-570 review by Arend , PA1ARE

Kenwood TS-2000 Transmit / Receiver eSSB Modifications by N3GX

A homemade GPS for TM-D710 using a Telit Jupiter JN3 GPS unit

This page describes some repair tasks related to the Kenwood TS-850 transceiver. You will be guided through the repair proces step-by-step followed by descriptions and pictures.

Changing band selector to a Kenwood TL-922 power amplifier by IW1PUR in italian

The page provides circuit improvements for the Kenwood TS-440S transceiver, addressing issues such as distortion in SSB signals, limited transmit frequency coverage, lack of crispness in RX audio, and flat audio response. The fixes include adjusting bias, cutting specific components, and changing capacitors to improve performance.

Kenwood schematics diagrams in high resolution format, includes Kenwood TS-830S , TS-820S and TS-520S

Setting up Digital voice keyer via USB for Kenwood TS-590

This page only applies to TH D7A's that have a S/N below 010xxxxx and have not had their firmware upgraded by a Kenwood Service Center.

Hard to find Kenwood Parts available for shipping worldwide

Demonstrates the _RoMac Automatic CW Identifier 2012_ software, a Windows application designed to automate station identification and provide a tuning pulser. It can send CW identification via a sound card's audio output or by keying a radio's manual CW jack using a serial port's DTR line. The software also supports CAT commands for various Kenwood, Yaesu, Flex, and Elecraft radios, enabling automatic mode and frequency changes for ID transmission. It integrates with USB audio-capable radios like the Icom 7300 and Yaesu FT-991, simplifying connectivity with a single USB cable. The application features a fully programmable interface, adjustable CW speed from **5 to 35 WPM**, and ID intervals from **5 to 30 minutes**. The integrated "Pulse Tuner" function allows for safe amplifier and antenna tuner adjustments by sending short audio tones or rapid CW keying, with an adjustable duty cycle from 1% to 100%. It offers compatibility with a wide range of transceivers and amplifiers, and a schematic for a basic sound card interface is included for users without existing setups.

Schemaric for a simple headset adaptor for some popular HTs by Kenwood, Baofeng and Wouxun by N1GY

Configuring the TM-D710 with Garmin Nuvi 350 for APRS setup

Kenwood TM-201/401 Increased TX Audio, mod for microphone gain

This page describes some repair tasks related to the Kenwood TS-440 transceiver.

Kenwood Portable SSTV device

W1AEX Audio settings and general observations