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Author Topic: Kenwood TH-F6A TX Mod Request  (Read 3663 times)
WD0JIM
Member

Posts: 11




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« on: September 17, 2001, 12:04:33 PM »

I'm looking for the extended TX mod for the Kenwood TH-F6A.

Thanks in advanced,

73 Jim-WD0JIM
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N0USM
Member

Posts: 1




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« Reply #1 on: September 17, 2001, 01:17:07 PM »

If you get anywhere finding out about the TX mod for the TH-F6 could you please let me know.  I have been scouring the net for this info.  I will let you know if I end up finding it.

Thanks,
Randy
N0USM
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AB7NI
Member

Posts: 6




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« Reply #2 on: September 24, 2001, 05:36:14 PM »

Any luck with the mod? It seems to be a well guarded secret.

Gary W
AB7NI
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WD0JIM
Member

Posts: 11




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« Reply #3 on: October 01, 2001, 10:36:00 PM »

The mod is same for TH-F6A (USA) and TH-F7E (Europe).

1. Lift the SP/MIC rubber cap.
2. Remove the tuning knob, volume knob, antenna.
3. Remove the nuts underneath.
4. Remove the battery pack.
5. Remove 2 screws at the bottom.
6. Lift the die cast chassis with a flat-head screw driver GENTLY!
(Speaker cable is connected to the PCB. So, do not pull the PCB
hard!)

7. Looking at the PCB from the front (without a case), you will
see 4 chip jumpers between [1] key and [PWR] key.

  {PWR key}

     [V] (TX mod jumper)
     [A]
     [A] (No jumper for TH-F7E)

     [R] (MARS/CAPS, RX mod jumper)

         {1 key}

Level 1 (MARS/CAPS, RX mod) {Recommended}
Remove [R] jumper.
After removing the [R] jumper;
TH-F6A can transmit 142-152, 216-235, 420-450 MHz on A-band.
TH-F7E can receive  137-174, 410-470 MHz on A-band.

Level 2 (TX mod)
Remove [V] jumper.
After removing the [V] jumper;
TH-F6A can transmit 137-174, 216-235, 410-470 MHz
TH-F7E can transmit 137-174, 410-470 MHz

Put all the case and screws.

Caution:
These mods WILL reset and initialize the memory contents.
So, write down important memory channel frequencies before
performing the mod.



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K6BEF
Member

Posts: 2




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« Reply #4 on: October 02, 2001, 01:04:41 AM »

I tried it tonight.  I did the mod, the radio said resetting upon power up but the Tx range did not change.  I was doing only the Level 2 mod and did not take off the R chip, only the V chip was taken off.  Does Level 1 need to be done in addition to Level 2 to expand Tx range?
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AB7NI
Member

Posts: 6




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« Reply #5 on: October 04, 2001, 02:05:18 PM »

Thank you for the mod. I did it and it works perfectly.

Gary
AB7NI
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KI6O
Member

Posts: 1




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« Reply #6 on: October 04, 2001, 08:45:32 PM »

I opened up the F6A and saw only 3 diode chip jumpers.  The diodes have a band
on the cathode end and all have a "V" marking on the case.  Since I couldn't find the "4
jumpers" I stopped and I'm waiting for a little more information.  Is mine different than
others?  I doubt it!      If anybody can help I would really appreiciate it.
Thanks de KI6O  Tom
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K6BEF
Member

Posts: 2




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« Reply #7 on: October 05, 2001, 12:01:07 AM »

Gary,

Which mod did you do?  MARS or the Level 2 mod?

Brent
K6BEF
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VA7PO
Member

Posts: 1




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« Reply #8 on: October 14, 2001, 06:52:05 PM »

Hi Tom

Did you have any success finding more info?.. I have the same layout as you describe.

'73

Pat
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KB7TSE
Member

Posts: 1




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« Reply #9 on: October 17, 2001, 02:00:25 PM »

I did it and works, just as explained, thanks a bunck, KB7TSE Matt
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MM0BFF
Member

Posts: 1




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« Reply #10 on: October 30, 2001, 09:30:33 AM »

Kenwood TH-F6a/7e

This mod expand the frequency range to:

TH-F6A can receive 142-152, 216-235, 420-450 MHz on A-band.
TH-F6A can transmit 137-174, 216-235, 410-470 MHz.
TH-F7E can receive 137-174, 410-470 MHz on A-band.
TH-F7E can transmit 137-174, 410-470 MHz.

First remove the grey plastic Mic speaker Cover on the side of the radio (trust me if you forget it will be impossible to get it apart!).
Then the ant. and the vol tunning knob and the nuts below then, take the battery off and remove the two screws below the battery pack.
Take the cover off very slow cause you damage the speaker wire if you mess up and go fast!.. You can leave the speaker connnected, just push the top part off to the side very gently!

Once in the radio look over to the left side below the Mic...

You will see a series of three diodes remove the top one.

Look below the last diode and you will see a chip resistor.

I heated them very quick and placed a thin jewelers screwdrive underneath and it came right off the board.

Just another note, make sure that the joystick mounts correct or else it might not function correct.

Caution:
These mods WILL reset and initialise the memory contents. So, write down important memory channel frequencies before performing the mod.
DE  MM0BFF
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IRSIR
Member

Posts: 1




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« Reply #11 on: November 21, 2001, 05:47:11 AM »

Same mod with pictures see http://www.mods.dk I never trust stuff on the net but took a chance on this one and guess what my th-f7e still works and it now covers the wider range on both transmit and receive. 3 tips when you remove the spc/mic cover dont remove the entire thing leave the one that holds it to the cover connected.. secondly to loosen the nuts use a small flat screwdriver in the groove and bang the screwdriver with something small in a anti-clockwise direction.. thirdly when I screwed the 2 screws back in the one striped.. does anyone know how to fix a stiped plastic screw holder?Huh
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WA6EIK
Member

Posts: 3




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« Reply #12 on: November 29, 2001, 09:30:55 PM »

This might be a bit dated but you can see pictures of the radio opened up along with the mod at:
http://www.mods.dk/mods.php3?radio=kenwood&model=th-f6&selectid=2161#2161
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