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Note:

If you only wish to extend the RX and not the TX of the radio have a look at the resistor configuration at position number J4 in your radio (This is shown open in the photo below). if J4 it's fitted remove it. This will open the RX to allow the radio to receive outside the normal amateur bands. If you have a resistor or solder link in the position of J4, then your radio should be locked to RX only within the amateur bands on VHF and UHF.

The configuration of the resistors can done by simply replacing a resistor by soldering a blob of solder to bridge the gap in place of were a resistor should be.

if your not sure in any way about the mods, don't be afraid to ask. I will try to help you the best I can.

 

General Coverage TX Mods by G1IVG.

Procedure.
  1. Disconnect all cables and connectors from your radio.
  2. Remove the carry handle by taking out the two screws at each end of the handle.
  3. Remove the other two screws on the opposite side of the radio.
  4. Remove the two screws from the rear of the radio, that hold the top and bottom covers.
  5. Remove the remaining two screws from the bottom cover near the front panel.
  6. Now you can remove the bottom cover from the radio.
  7. Place the radio on a clean surface with the top of the radio facing down.
  8. Place the front panel towards you.
  9. Now you should be able to see the Lithium battery to the top left hand side of the PCB.
  10. Look closely and you will see 6 small surface mount resistors just below the battery and to the left.
  11. They are labelled on the PCB as 1,2,3,4,5 & 6 (See photo below).
  12. You need to configure the resistors as in the photo below.
  13. After re-configuring the resistors double check your work and then replace all covers.
  14. Finally you need to make a note of any memory channels you have programmed including offsets etc. As the CPU needs resetting to acknowledge the new configuration.
  15. To reset the radio's CPU make sure the radio is OFF, then press and hold the <FAST> and <LOCK> button's and turn the radio ON. Remember all the contents of the memory channels will be reset and lost.
  16. Also the Automatic Repeater Shift (ARS) will be lost. But all you need to do is, to reprogram the offset from the Menu option No:16 (10mtrs) Menu No:17 (6mtrs) Menu No:18 (2mtrs) and Menu No:19 (70cms)

NOTE:

The photo below shows the radio "AFTER" the modification.

Notes from the photo above:
The photo shows the radio "AFTER" the modification.
  1. "In Place" means that a resistor must be fitted in this location.
  2. "Solder Link" means that you must solder a bridge across the pad no:3, if a resistor is not fitted originally.
  3. "Out" means, remove any resistor from this location.

The coverage of the radio after the modification.

Receiver (the same as before the modification)

Band         Min RX freq.   Max RX freq.

H.F.                    100KHz             37MHz

VHF (A)             37MHz             76MHz

VHF (B)           108MHz           174MHz

UHF                 410MHz           512MHz

Transmitter

Band         Min TX freq.   Max TX freq.

H.F.                    1.8MHz             37MHz

VHF (A)             37MHz             76MHz

VHF (B)           137MHz           174MHz

UHF                 410MHz           470MHz

 

If you decide to carryout the same modification on your FT847, then you do so at your own risk.  

This TX modification verified to work on the following serial numbers:

Note: "XXX" replaces the last three digits of the serial number for privacy reasons.   

8C020XXX     8F040XXX    8G051XXX    8G060XXX    8G070XXX    8H080XXX    8H090XXX     8I100XXX    8J120XXX   8K130XXX    8K150XXX   8K151XXX     8L160XXX     8N170XXX    9I240XXX   9I250XXX  0D280xxx OE310XXX

E-Mail me your serial number, that the mod is known to work on.

Configuration of Chip Resistors.

Please let me know if there any mistakes in the chart below. As far as I know the information is correct, however proceed at your own risk. [email protected]

 

TX Frequency Range

RX Frequency Range

    

Jumpers

    

Remarks

  

HF

VHF

UHF

HF

VHF(M)

VHF

UHF

1

2

3

4

5

6

FM CH Step

RPT Shift

      1

144-146

430-450

0.1-30 50-54

  

144-146

430-450

X

    

X

X

X

5/20kHz

0.6/5 MHz

      1

144-148

430-450

0.1-37 37-76

  

108-174

420-512

X

      

X

X

5/20kHz

0.6/5 MHz

      2

140-154

420-450

0.1-37 37-76

  

108-174

420-512

X

        

X

5/20kHz

0.6/5 MHz

      3

144-146

430-440

0.1-30 50-54

  

144-146

430-440

  

X

  

X

X

X

12.5/25kHz

0.6/7.5 MHz

      3

144-146

430-440

0.1-37 37-76

  

108-174

420-512

  

X

    

X

X

12.5/25kHz

0.6/7.5 MHz

      2

140-154

420-450

0.1-37 37-76

  

108-174

420-512

  

X

      

X

12.5/25kHz

0.6/7.5 MHz

      4

144-146

430-440

0.1-30 50-54

70.00-70.50

144-146

430-440

X

X

  

X

X

X

12.5/25kHz

0.6/1.6 MHz

      4

144-146

430-440

0.1-37 37-76

  

108-174

420-512

X

X

    

X

X

12.5/25kHz

0.6/1.6 MHz

      5

140-154

420-450

0.1-37 37-76

  

108-174

420-512

X

X

      

X

12.5/25kHz

0.6/1.6 MHz

      6

144-146

432-438

0.1-30 50-54

  

144-148

432-438

    

X

X

X

X

12.5/25kHz

0.6/1.6 MHz

      6

144-146

432-438

0.1-37 37-76

  

108-174

420-512

    

X

  

X

X

12.5/25kHz

0.6/1.6 MHz

      7

144-148

430-450

0.1-30 50-54

  

144-148

430-450

X

  

X

X

X

X

5/25kHz

0.6/5 MHz

      7

144-148

430-450

0.1-37 37-76

  

108-174

420-512

X

  

X

  

X

X

5/25kHz

0.6/5 MHz

      8

144-146

430-440

0.1-30 50-54

  

144-146

430-440

  

X

X

X

X

X

12.5/25kHz

0.6/1.6 MHz

      8

144-146

430-440

0.1-37 37-76

  

108-174

420-512

  

X

X

  

X

X

12.5/25kHz

0.6/1.6 MHz

      2

140-154

420-450

0.1-37 37-76

  

108-174

420-512

  

X

X

    

X

12.5/25kHz

0.6/1.6 MHz

 

For HF, 6mtrs and 4mtrs  range see table below.
 

160m

80m

40m

30m

20m

17m

15m

12m

10m

6m

4m

1

1.800-2.000

3.500-4.000

7.000-7.300

10.100-10.150

14.000-14.350

18.068-18.168

21.000-21.450

24.890-24.990

28.000-29.700

50.000-54.000

  

2

1.800-2.000

3.500-4.000

7.000-7.500

10.000-10.500

14.000-14.500

18.000-18.500

21.000-21.500

24.500-25.000

28.000-30.000

50.000-54.000

  

3

1.815-1.890

3.500-3.800

7.000-7.100

10.100-10.150

14.000-14.350

18.068-18.168

21.000-21.450

24.890-24.990

28.000-29.700

50.080-50.400

  

4

1.810-2.000

3.500-3.800

7.000-7.100

10.100-10.150

14.000-14.350

18.068-18.168

21.000-21.450

24.890-24.990

28.000-29.700

50.000-52.000

70.000-70.500

5

1.800-2.000

3.500-4.000

7.000-7.500

10.000-10.500

14.000-14.500

18.000-18.500

21.000-21.500

24.500-25.000

28.000-30.000

50.000-52.000

70.000-70.500

6

1.820-1.890

3.500-3.800

7.000-7.100

10.100-10.150

14.000-14.350

18.068-18.168

21.000-21.450

24.890-24.990

28.000-29.700

50.000-52.000

  

7

1.800-2.000

3.500-4.000

7.000-7.500

10.000-10.500

14.000-14.500

18.000-18.500

21.000-21.500

24.500-25.000

28.000-30.000

50.000-52.000

  

8

1.810-1.850

3.500-3.800

7.000-7.100

10.100-10.150

14.000-14.350

18.068-18.168

21.000-21.450

24.890-24.990

28.000-29.700

50.200-51.200

  

 

 

You will find other mods and info on these links.