IC3 6.8V 9V 10V The Mitsubishi specsheets specify a bias of +8Vdc and +9Vdc, with an absolute maximum value of +9Vdc and +10Vdc respectively. I probed the Vbb DC biases on pin 3 of the two modules when in Transmit and saw what follows: Hybrid Module Measured Specified Absolute Maximum Driver IC2 6.2V 8V 9V P.A.

TROUBLESHOOTING I decided that I would not miss the VHF contest a couple of weeks later, so I went ahead and opened up the hood on the TS-2KX to try to better assess the problem. The other problem is that I was not the original owner of the rig. The reasons were that they gave only a one year warranty extension to the original warranty for this fix my rig is older than that. The bad news was that I would have to pay for THEIR design flaw. So I called up Kenwood USA.Ī service person (nice, I must say) answered but provided little detail on the actual problem, other than confirming that there was a fix available and that Kenwood would have to do it for me since it involved a re-calibration via software of some of the internal parameters. Since my TS-2K's serial number starts with a 6 (which means 2004), I knew that my unit might be part of the defective batch. The flaw is that the two hybrid power modules used as Tx driver and Tx power amplifier were under-biased on the Vbb pin for rigs dating earlier than 2006. Others reported a design flaw kept quiet by Kenwood. Following that evening, I did some research on the internet and found hints of what might have been happening. This sounded like a major case of non-linearity to me.

To my surprise, the other party reported that I had a very distorted audio in SSB and that he could barely understand what I was saying. BACKGROUND One day, I decided to try the L-Band function on my TS-2000X in preparation for the ARRL June VHF contest. Here is a detailed description of what I found and what I did to cure it. One bug I discovered is a severely distorted SSB transmission on models built prior to year 2006. Like most radios, it has some flaws though. Kenwood International Frequently Asked Questions offers you support for every range of products Kenwood Support. Convert Kenwood Arcp 2000 1.10 trail version to full software. It is not perfect on all fronts but it does everything well, much like a swiss pocket knife. Kenwood TS-2000X 1.2GHz Tx Distortion problem and fix By: Bertrand Zauhar, VE2ZAZ The Kenwood TS-2000X amateur radio transceiver is a great radio because it covers HF, VHF, UHF and L-band all in one box.

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