01-29-2012, 04:14 AM
Has anyone made their own cable to program Kenwood radios that use the KPG-22 type cable? I have seen designs in the past but the only few articles I can find online are very limited.
I in particular have a TH-F6 HT.
01-29-2012, 06:48 AM
This might help http://highfields-arc.co.uk/constructors/other/kpg22.htm.
Has anyone made their own cable to program Kenwood radios that use the KPG-22 type cable?
The majority (not all) of the PC "programming cables" for radio equipment are TTL Level Converters.
The electronics and uProcessors internally within your radio (or HT) normally operate at 5 V, 3.3 V or 1.8 V levels ...
and have a serial data stream (in some radios this data stream is inverted).
MicroChip - Tips and Tricks (Dealing with lower voltage levels, 3.3V and 1.8V with newest electronics designs)
TTL voltage levels are NOT compatible with the standard PC and laptop connections (RS-232 or USB)
SO, a Level Converter (interface or cable) serves multiple purposes:
1. ISOLATES your HT/Radio from your PC or Laptop. This is to protect (ESD) the electronics of both appliances.
2. CONVERT your HT/Radio serial data stream to established PC/Laptop standards (RS-232, USB)
3. REQUIRES DC power (external or from RS-232 or USB ports) for the Active devices (e.g. transistors, ICs) that are used for 1 and 2 above.
4. CORRECT connectors provided to quickly and easily attach to your specific radio (e.g. 3.5 mm TRS jack) and your PC/Laptop (Std. or Mini-USB; DE-9 RS-232)
I have seen designs in the past but the only few articles I can find online are very limited.
SHOP at SPARK-FUN
Ready Made (Plug-N-Play) cables and DIY Build schematics for Level Converters (RS-232 and USB)
Listing compiled by G4HFQ
Maxim MAX232 series of ICs is the most popular for RS-232 connections.
FTDI FT232RQ and Silicon Labs CP2102 USB conversion chips (buy at Spark-Fun, Mouser, DigiKey, Newark, Allied, etc.) are most popular for USB connections.
BTW, this is not rocket science. Middle and high school students build these cables, once they learn to solder!
PIC programmers, Robotics builders and e-hobbyists (appliance and routers using embedded uProcessors)
build and use these TTL Level Converters -- everyday !!
Your Kenwood TH-F6 HT presents a TTL serial connection to its internal uProcessor
for connection to radio programers or with converison to RS-232 (or USB) to Personal Comptuers running a programming application (e.g. Windows).
RS-232 versus TTL Serial Communication by SparkFun Electronics