Programming Kenwood TK-931 
Using the Kenwood program KPG 5D and programming cable KPG 4,  program the 
radio with all of the ctcss tones you desire and all other functions. Use FCC 
channel number 200 in all systems. This will indicate frequency 937.5000. 
Save this file and exit program Run the program, Kenwood3.EXE.  Select the 
TK-931. Enter the frequency of the FCC channel 200, which you used in the 
programming. That frequency is 937.5000. Entered, you will see the binary code
is C8 98. Enter "Y" for another frequency then enter a frequency you desire. 
Write down the 4 digit binary code and continue until you have all of the 
codes you require for the number of  "FCC 200's" you entered in the programming
program.  Run your Hex Edit program and load the file ***.F90 or .B90 you 
created when you programmed the TK-931. In lines 230, 2F0, 3B0, 420, 470, 530,
5F4 you will see the FCC number 200, 937.500, binary number, C8 98, every where
you entered "200". If you have entered 200 as several groups in a system, you 
will see them in the same line.  All of the transmit frequencies should be 
loaded into system 1. Each Receive system should be a separate system. All 
should be programed as Talk Around "yes"  Now you may start replacing 
those binary with the one you have written down as the frequencies you want. 
When complete save as the same name or change as you wish. Exit and reload the
Kenwood program and load the program you just saved. Check each system and 
group to make sure you have the frequency you want.  DO NOT attempt to 
edit the FCC number selection. The result will be that it goes away....and you
will have to edit the file again..  Remember that the Frequency you enter 
will be the Receive frequency and the Transmit will be 39 mhz below that 
frequency. Not Good! Remember to use T\A in the original programming.
You will transmit and receive on the same frequency. All of the transmit 
frequencies should be programmed into one system, each receive frequency will 
be an individual systems. Select "Last Used" in the program. Select the 
transmit system and the repeater input you want, turn on the scan and you are 
ready to transmit. Let up on PTT and the radio scans to the repeater 
output. DO NOT transmit while receiving or you will be moved to that frequency.
Wait for the repeater to drop and resume scan before transmitting.  I have 
modified some mics with spdt switches. Center to ground ppt one N.O. side Hook 
switch on the other so when you ptt the scan is off and is not receiving 
anything and will not displace you. Scan resume is very slow on the 931,s and 
make better repeater exciter, transmitter or receivers.  The RF filters in 
the receiver will need to be replace to get the best performance.  One is the 
same as used in the Maxtrac, the other is a 4 pole. I use two, two pole 
soldered together.
Gene Colson W7UVH