TS-940 Giehl Chip

I have the original V8.9 Giehl chip available for the Kenwood TS-940S. The package contains the software chip and two pages of documentation, which describe the installation and operation of the chip. By installing the Giehl software chip into your TS-940, you can change the frequency of a Memory Channel with Tuneable Memories. Memory Bank selection is done at the front panel. The Main Vfo Knob Tuning Rate is switch selectable to four different rates. The Microphone Up and Down Keys can be used to change memory channels.

Enhancements:

Tuneable Memories makes each of your 40 memory channels tune like a vfo, so that you can temporarily change the frequency of a memory channel in MEMO mode with the Main Tuning Knob. If you have changed frequency and press M-VFO, the displayed frequency is loaded into the vfo. If you press M-VFO again, the original frequency stored in the Memory Channel is loaded into the vfo.

Memory Bank Selection is performed by pressing the 1 MHZ STEP UP or DOWN key while in MEMO mode. The MHZ UP key will move to a higher Memory Bank and the MHZ DOWN key will move to a lower Memory Bank. A beep will be heard as the key is pressed whenever the Memory Bank is changed.

Main Vfo Knob Tuning Rate is now controlled by the former MEMORY BANK switch located under the sliding top cover of the radio. The SSB, CW and FSK rate is 1, 2, 5, or 10 kHz per revolution of the Main Vfo Knob at setting 1 through 4 respectively. Multiply the rate by 10 when using AM or FM. A software hysteresis algorithm has been incorporated to provide optimum Main Vfo Knob tuning. If the knob is turned slowly (less than 2 turns per second), the selected rate is used. If the knob is turned quickly (more than 2 turns per second), the selected rate is used for up to 500 milliseconds. If the knob continues to be turned quickly, the rate rapidly increases to allow large frequency excursions. The result of this algorithm is that it lets you quickly make minor frequency changes without jumping to a high tuning rate.

Microphone UP and DOWN keys change the memory channel of the current Memory Bank when operating in MEMO mode. Pressing the UP key moves to a higher channel and pressing the DOWN key moves to a lower channel. Press and hold either key to automatically repeat changing memory channels. 

Installation and Ordering Info:

The Giehl chip replaces the IC2 chip in the Digital A Unit. Some TS-940 IC2 chips are soldered and some are in sockets. Chips that are soldered without a socket require extra care in removing the original and installing the Giehl chip. To order, please send an email to wb8bfs@fuse.net. The chip is available for $49.00 by Paypal, personal check or money order, and includes First Class postal shipping in the USA.