Yaesu FT-209 Modifications
Jump to New VHF Frequencies.
Don't you wish your Yaesu FT-209R/RH or 709R would go above 150 or 450 MHz like ICOM´s HTs do? I did. so I called the Yacsu service center to find out how to go about doing this. The technician I spoke with told me this was "secret" information, but allowed that their equivalent commercial units have the same microprocessors as the FT-209 and FT-709 HTs.
That's all I needed to know. I opened my radio, heated the soldering iron, and proceeded to jump pins in the control unit until I found the correct configuration. [Ed. note, this is not a recommended procedure!] The following are the results.
The modifications are:
- Extended frequency coverage
- Enhanced power saver
- Improved scan feature
- Increased receiver sensitivity.
The extended frequency modification allows you to program the lowest and the highest receive and transmit frequencies. The enhanced power saver allows receive limes 0.4 to4.0 seconds, in400 millisecond steps. The new scanner stops on a signal and waits for the conversation to conclude, and then restarts scanning after two seconds. Finally, a quick tune-up of the RF amplifier increases receiver sensitivity.
Doing the Work
To open the radio, first remove the battery pack and and turn the radio on and off once to discharge the circuitry. Next, remove the the four screws holding the battery track and pry it out. Remove the two screws holding the bell clip and the one beneath it. Also, remove the two screws holding the carrying strap to the radio.
Now, slide a fiat jeweller's screwdriver in from the bottom, between the black side trim and the radio, until it stops. Tu ist the screwdriver, and the trim should pop off. Now remove the two side screws and slide the U-shaped back cover off. At this point, be careful not to damage the electronics. Now, remove the four tiny Phillips-head screws holding the front panel into place, then fold the panel to the right (in the 709R, you have to dcsolder a ground jumper on the left-hand side.)
Take the following steps to extend the frequency coverage on the 209R/RH:
1. Jump (solder across) pins 1, 7, 9* 10. 11, 13, and 16. Leave the pre-solder pins alone.
2. To extend the power-saver, jump pin 12.
3. Remount the front panel with the four small Phillips-head screws.
4 Standard VCO range is 136-153 MHz. To move the VCO span up, lurn TO1 (on the control board) clockwise (inward) one to two turns, one turn at a time. TO1 is located in the 1" x 3/4" shielded enclosure. This is the left hole when the unit is face-down and bottom toward you.
I adjusted the VCO to span 142-157 MHz to prevent lostpower and sensitivity in the ham bands. You may have to remount the battery track, reset, and program the unit for 150-160 MHz, and move TOl until RF output is indicated on no higher than 156.5 MHz,
5. To get improved sensitivity, remove the front cover, dial 146 MHz, and, with a generated signal, tune T02. T03. and T04 for maximum signal. These are the three consecutive cans from the antenna jack on the receiver board (under the speaker).I found mine lo be each to 1 turn off. Also, adjust TOS, the fifth can from the antenna, for maximum signal
Follow the steps below extend ihe frequency coverage for the 709R;
1. Same as for the 209R/RH. plus jump pin 4.
2. The power-saver modification can't be done here unless pin 12 is present.
3. Same as for the 209R/RH.
4. Same, but the VCO range 430-455 MHz.
If TO1 is adjusted inward about two turns, the range shifts to up to 439.5-465 MHz.
5. Not necessary for the 709R.
6, Resolder the ground jumper between the control board and ground.
This completes the modification section, Reassemble the unit.
When you finish the modifications and reassemble the unit, reset it once more. The programming:
1. In the first memory, enter the lowest receive frequency and dial, and in the second memory, enter the highest receive frequency and dial.
2. In the third memory , enter the lowest possible transmit frequenc\ and dial, and in the fourth memory, enter the highset possible transmit frequency and dial.
3. Enter repeater shift F, and shift
Here is a sample program for the FT-209R
This memorizes a receiver range of 145.1-157 MHz. + a transmit range of 144-148 MHz, and a 600-kHz repeater shift.
A sample program for the 709R:
This memorizes a receiver range of 442-465 MHz, a transmit range of 440-449.975 MHz and a 5-kHz repeater shift.
There is a loss of sensitivity in the lower 2 MHz of the band on the FT-209R/RH model, but, if the VCO is tuned as above, Ihe ham bands aren't affected. There's no perceptible loss pf power or sensitivity on the FT-709R.
In conclusion, go ahead and jump—and make your 209R/RH and 709 better than before
1987 - Andrew Milt KD2WA -