Omni V.92 Second Version Chip This chip no longer requires the serial port mod. Full serial port operation is now available with no hardware mods to the Omni V. First, you need to install the chip in the Omni V. Remove the top cover and locate the microprocessor chip. Remove the chip. You may need a small "L" shaped tool to pry out the chip. You can make one with an old hack saw blade. Just bend about 1/2 inch and one end of the blade about 90 degrees. This will you to slip the bent portion of the blade under the chip and gently pry it up. Once you have removed the old chip, place the new chip in the socket. Take care to notice the orientation of the chip in the socket. The notch on the chip should point to the left hand side of the Omni V when viewed from the front of the radio. Also make sure all the pins are in the socket before applying pressure to insert the new chip. Sometimes the new chips have all their pins spread apart just a little more than the size of the socket. You can simply lay the new chip on each pin side on a table surface and bend all the pins slightly to get the spacing just right. Next, you need to re-lable your keys. The keypad layout is as follows: VFO>M M>VFO CLRCLK No change on this row 160 80 40 30 20 17 15 12 10 ENTER SHIFT CLEAR Also, place the numeric key lable over each band button for direct frequency entry. The numbers go as follows: The 160 button has a 1 over it. The 80 button has a 2 over it. The 40 button has a 3 over it. The 30 button has a 4 over it. The 20 button has a 5 over it. The 17 button has a 6 over it. The 15 button has a 7 over it. The 12 button has a 8 over it. The 10 button has a 9 over it. The shift button has a 0 over it. This completes the re-labelling. When first installing this chip, an initialization procedure must first be run. With the new chip installed, do the following: 1) Power on the Omni V 2) Press the reset button on the right hand side of the Omni V 3) Power off the Omni V Now clear all memories and set the band registers to the default values: 1) Power off the Omni V.9 2) Press and hold the clr/clk key. 3) Power on while the clr/clk key is pressed. 4) Release the clr/clk key after 1 second. The Omni V.92 should now be ready for use. CW Spotting tone MOD This part of the installation is optional. It allows the "Clear" key to turn on the CW sideton so it can be used as a spotting tone. I'll try to explain in words how to add the diode for the spotting tone. Assume you are viewing the microprocessor board from the front of the radio. You will see the microprocessor chip that you are replacing. Toward the back of the board you will see a long blue socket for the voice board. About in the middle of this socket and slightly towards the front, you will see 5 resistors working their way from the blue socket towards the front. Solder a 12 inch thin wire to the left side of the resistor closest to the blue socket. The resistor is marked with a single black band as are the other 4 in this group. Now look to the extreme left side and rear of the radio. You will see the side tone oscillator board. Look to the right side of this board and you will see connector 63. Solder the banded side of a small signal diode (almost any diode will work) to the "closest to the front connection" of connector 63. Solder the other end of this diode to the 12 inch wire. That's it. OMNI V.92 N4PY Operational Differences Up and Down arrow function - For UP and DOWN of 100 KHZ press UP UP or DOWN DOWN. Continued holding of the arrow key will continue to move 100 KHZ. For quick split selection of a digit KHZ amount proceed as follows: 1) Press the UP or DOWN arrow for desired direction of split. 2) Press the digit key 1 to 9 corresponding to the split offset. The alternate VFO will now have the main VFO amount plus the offset and split will be turned on. Tuning Rates - The tuning rate in CW, FSK with FAST off is now 1.2 KHZ per revolution. All other rates are unchanged. Tuning rates are now as follows: CW,FSK STEP SIZE (HZ) KHZ PER REV NORM 10 1.2 FAST 10 4.8 LSB,USB STEP SIZE (HZ) KHZ PER REV NORM 10 4.8 FAST 20 9.6 FM STEP SIZE (HZ) KHZ PER REV NORM 50 24 FAST 100 48 Page -2- Serial Port - All the OMNI-VI CIV commands are implemented. This includes commands 00H to 19H. In addition, the set mode commands (01h and 06H), allow the both the mode and filter to be set. Sending the filter data byte is optional. The filter data byte directly follows the mode byte. The values for the mode and filter data bytes are as follows: MODE FILTER 00 - LSB 01 - 2.4 01 - USB 02 - 2.4 02 - NOT USED 03 - 1.8 03 - CW 04 - .50 04 - FSK 05 - .25 05 - FM 06 - .25+NAR 07 - .50+NAR 08 - 1.8+NAR 09 - 2.4+NAR The get mode command (04H), also returns these values. Your serial cable must have just 3 wires in it. I made a cable with a male DB 25 that plugs into the Omni V and a female DB 9 on the other end that plugs into the PC serial port. The cable is 2 RG/174 cables. The first cable has the center lead going to pin 2 on the DB 25 and pin 2 on the DB 9. The second cable has the center lead going to pin 3 on the DB 25 and pin 3 on the DB 9. The shields on both cables are connected together and go to pin 7 on the DB 25 and pin 5 on the DB 9. CIV Computer Address - The CIV computer address is decimal 30. This is the same as the ICOM 761. This is sometimes called the radio address. Also, the baud rate must be 1200, 8 bit, no parity. Memory Tune - Memory tune now sets the receiver to the memory values as they are tuned. Page -3- Band Registers - Band registers are implemented the same as the OMNI-VI. Six meters is selected by pressing SHIFT 6. Six meters requires the use of the Tentec model 1208 transverter. The initial default values for the band keys are: 160M 1.830 MHZ .50 filter CW mode 80M 3.500 MHZ .50 filter CW mode 40M 7.000 MHZ .50 filter CW mode 30M 10.100 MHZ .50 filter CW mode 20M 14.000 MHZ .50 filter CW mode 17M 18.068 MHZ .50 filter CW mode 15M 21.000 MHZ .50 filter CW mode 12M 24.890 MHZ .50 filter CW mode 10M 28.000 MHZ .50 filter CW mode 6M 50.125 MHZ 2.4 filter USB mode Alternate values are: 160M 1.840 MHZ 2.4 filter LSB mode 80M 3.800 MHZ 2.4 filter LSB mode 40M 7.200 MHZ 2.4 filter LSB mode 30M 10.000 MHZ 2.4 filter LSB mode 20M 14.200 MHZ 2.4 filter USB mode 17M 18.110 MHZ 2.4 filter USB mode 15M 21.225 MHZ 2.4 filter USB mode 12M 24.940 MHZ 2.4 filter USB mode 6M 50.090 MHZ .50 filter CW mode Direct Frequency Entry - Direct frequency entry is implemented the same as the OMNI-VI. The ENTER key must first be pressed. Memory System - There are now 16 general purpose memories, 8 split memories, 20 band register memories, and one scratch pad memory. The operation to store into a memory is as follows: To store into the scratch pad memory: Press VFO->M twice To store into the next available memory: Press VFO->M ENTER To store into the next available memory above 7: Press VFO->M UPARROW This would be used for more permanent memories To clear the first 8 general purpose memories: While in memory tune mode, press SHIFT CLR/CLK Page -4- Crystal Calibration Mode - There is now a way to correct for crystal aging. To calibrate a specific band, proceed as follows: 1) Tune to the band and frequency of the known source signal. Mtune must be off for this procedure. 2) Tune the dial to read the exact frequency desired. 3) Press SHIFT TUNE. 4) Tune the signal in as accurately as possible. The display should not change while you are tuning. Take care to not tune the dial any more than is necessary. 5) When the signal is properly tuned, Press ENTER. This will exit the crystal calibrate procedure. Please note that the scratch pad memory and alternate VFO will be set to the value of the current VFO when the procedure is complete. Frequency Scan The OMNI V.92 will scan between 2 frequency limits by pressing the VCE key. To perform a frequency scan on a selected band: 1) Tune to the lower limit frequency. 2) Press SHIFT 1. 3) Tune to the higher limit. 4) Press SHIFT 9. The frequency scan limits are now set. 4) Press the VCE key. The radio will now scan between the limits selected. To slow down the scan, press the DOWN ARROW. To speed up the scan, press the UP ARROW. To end the scan and return to the original frequency, press CLEAR. To end the scan and stay at the current frequency, press ENTER. Display of date is now done with SHIFT VCE. New VFO lock function Pressing SHIFT FAST will lock the current VFO. The period in the last display digit will come on to show the VFO is locked. There is a separate lock status for each VFO. Memory full is no longer indicated on the display. Clear Key allows spotting in CW mode The Clear Key is now used to turn on sidetone for zero beating. This occurs only in CW mode. This requires an additional wire from pin 23 of the microprocessor to the sidetone enable pin. This must be run through a diode.