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Old 07-27-2006, 8:19 PM
Join Date: Dec 2002
Location: Pennsylvania
Posts: 441
Lightbulb Technical Manual for Kenwood TK-790

I have been using transceivers for many years in LE, but have absolutely no technical knowledge how they function. I was recently given a used Kenwood TK-790 VHF radio. I have the user's "Instruction Manual", but would like to read a tecnical manual so that I get some idea what DTMF or QT/DQT, etc. mean. Otherwise the programming software, also provided, might as well be in pig Latin. Thanks, guys. PM me if you have a manual to sell.
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Old 07-27-2006, 8:33 PM
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I bought a CD from an Ebay auction that had PDF files of many Kenwood service manuals, including the one for the TK-790. The CD was a pirated copy and I'm sure Kenwood wouldn't be too happy about their copyright being violated. If you look around on the web, though, you might find some useful files. Check the Kenwood-oriented Yahoo groups, too.

DTMF is an acronym for Dual-Tone Multi-Frequency. DTMF was developed by the Bell System for signalling across telephone lines. When you dial a "touch-tone" phone, you are sending DTMF tones. Some repeaters require a DTMF sequence in order to access the repeater or its special features. And some repeaters allow you to place a phone call through a phone patch attached to the repeater. This is all done by sending DTMF tones.

QT and DQT are Kenwood's nomenclature for CTCSS and DCS, also known by their Motorola tradenames PL and DPL. PL is a continuous low-frequency tone that is mixed with the transmit audio from your radio. If the corresponding receiver is set up to decode PL, it will open its squelch only when the correct PL tone is heard from your transmitter. DPL works the same way except that the code is a very brief digial burst at the beginning of each transmission.

Either the DOS or Windows versions of the TK-x90 programming software has help screens. Press F1 when you have the cursor over a feature you don't understand and the help screen will pop up with a brief explanation.

I have a TK-790H (VHF High, 110 watts) and a TK-890 (UHF, 35 watts). I am currently running the 790 in my mobile and I'm very impressed with its features and capabilities. My plan is to get the dual-band kit so I can run both the 790 and the 890 from one control head.

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Old 01-01-2008, 11:08 AM
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Join Date: Dec 2005
Location: Ohio
Posts: 382

I am looking for a 790 manual too. I am trying to find if my 110W 790 has a low power setting?
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Old 01-08-2008, 11:12 AM
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Join Date: Dec 2007
Location: Metro Area, MI
Posts: 540

You might also try the kenwood website. They have the manual available in PDF format for download. I have gotten duplicates of manuals that I needed for radios that I have from the website.

Have gotten several for different Ham equipment that I own and also for a UHF commercial unit that I have.

I was able to get most of these off of the kenwood site

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