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Galaxy DX-959 NPC-RC Mod

Discussion in 'CB and Export Equipment and Accessories' started by Mongoose, Apr 25, 2011.

  1. Mongoose

    Mongoose
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    Ok, I have seen that doing this mod is good. I see that I would use a 100 ohm resistor and a 1n1004 diode but where do they go in a Galaxy DX959.


     

  2. Mongoose

    Mongoose
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    Correction on the diode, 1N4001. Never mind I found it.
     
  3. Robb

    Robb
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    Yup

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    How about sharing that mod - then?
     
  4. Mongoose

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    This is what I found. :D This is a copy and paste.

    This trick will apply to most SSB and Export type radios only including the 148 GTL, 2000 GTL, Grant XL & LT, Galaxy, Connex, Superstar, RCI and more. The mods will be listed by board number, not radio model, so make sure you make a note of the board number that is stamped on the main PCBoard of your radio..... The diode is a 1N4001. If for any reason this mod doesn't do what it should, check the polarity of the diode. Banded end is the Cathode! You can remove the resistor completely and solder the diode in its place, but do not recommend this. If you really want to replace the resistor with the diode, do not run the power completely down (no dead key), this could cause faults in the AM Modulation Stage. When lifting the end of the resistor, solder the banded end of diode in its place (where it used to be), the other end of diode solders to the lifted end of the resistor.

    *EPT014811Z, PC411, PC412 (Uniden Grant XL, Uniden Madison, Cobra 148/2000 GTL, Teaberry Stalker 20 Export, Texas Ranger TR296 etc...)
    -Lift the end of R228 that connects to TR42. Place the cathode
    (banded end) of the diode towards TR42 and solder the other end to the lifted end of R228. Thats it!

    *(PC-385) Cobra 140 GTL, Teaberry Stalker IX, Realistic TRC-490, Uniden/President Washington (8719), Cobra 142GTL and maybe others
    -Lift the end of R121 that connects to VR6. Solder Banded end of diode to lifted end of resistor and other end of diode back in the hole where the resistor was lifted. This info has not been tested and the schematic shows differences not typical with a radio like above or below. Most of the other radios have a 560 ohm resistor and diode in parrallel with each other, this radio does not, so the info should work, but I cannot guarantee it.... Please verify that the above radios use VR6 as AM Power Control. If any changes need to be made or a radio needs to be removed or added, please let me know...

    *EPT360014, EPT360011 (Galaxy, Connex, Superstar and more. Excalibur SSB)
    -Lift end of R240 that connects to C189 & C188. Solder banded end of diode towards C188 and other end to lifted end of R240. Check for peak power at low power setting and see if it matches the peak at high.

    *EPT069610Z (Galaxy DX959/949/2547, Texas Ranger 696F SSB, 696F, 396, 936, 966)
    -Lift end of R266 that connects to D103 and C233. Solder the banded end in the empty hole where resistor was lifted and solder the other end of diode to lifted end of resistor. (CORRECTION submitted by Mav391: Cap number is C233, not C133 as earlier listed - Thank you for the updated info!)

    *EPT295013Z (RCI 2950/2970 (Not DX))
    -Lift end of resistor R285 that connects to C300 & C303. Solder banded end of diode to the empty hole going to C300 & C303, solder other end of diode to lifted end of resistor.

    *EPT690010Z
    -R266 - This is done exactly the same as the 959/949 and 2547. These boards are identical in every way except the exclusion of FM and the PLL area is different.

    *EPT990010Z Ranger RCI-6900FHP
    -Lift end of R292 that connects to C261 and C255. Solder the banded end in the empty hole where resistor was lifted and solder the other end of diode to lifted end of resistor.

    *PC999 President Grant Export
    -Lift end of resistor R282 where it connect to C217. Solder banded end of diode in the hole and solder the other end to the lifted resistor.

    *PC833 Cobra 146 GTL, Uniden AR144 & AX144
    -Lift end of R212 that connects to C180. Solder banded end in hole and other end to lifted end of resistor.

    *Clear Channel Ranger AR-3500
    -Lift end of R249 and place banded end of diode towards Q34. I have heard this will also work with R224 as well.....

    *PC893 - Stalker 9 FDX R255

    *PC965 R212

    If anyone has the schematic for the PC965, PB062, PB042, PB122 boards, feel free to e-mail them to me and I can update the rest of the info for them.

    UPDATE: You can use the info as above or you can try this on your own. I and Toll Free have tried this on our radios and achieved a bigger increase. Toll Free used a President Grant Export and a RMS Bird Meter. His results were as follows.....

    1 watt dead key and swing to 8 before, 1 watt dead key and swing pegged the 10 watt scale. On a Yaesu YC-60 Meter, his peak was at 40 watts. Remember this was a Grant Export...

    My results were found using my Stalker 20 (PC-411AD) and an Astatic 600 Test Meter as follows....

    6 watt dead key swing 18 before, 6 watt dead key swing to 23 after.

    If you are wondering what we did, here it is.... Just remove the resistor and put the diode in its place completely instead of hooking them up in series.
    Good luck and enjoy the info! WCR
     
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  5. hotrod

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    not worth it imho
     
  6. Bigmic919

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    From all accounts I have heard you really need the right equipment to set it up properly.
     
  7. sp5it

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    Master of puppets

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    True. Oscilloscope and audio signal generator is a must to get clean signal but results are impressive.
    Mike
     
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  8. cbradiomagazine.com

    cbradiomagazine.com
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    The audio on the 959 is pretty good to start with, I wouldn't see any reason to do a npc mod.
     
  9. hotrod

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  10. HomerBB

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  11. n0zna

    n0zna
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    i just peak them up and if need more pwr get a small amp.
     
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  12. Robb

    Robb
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    Yup

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    Nice thread and very useful info!
    Deserves getting a sticky - IMO . . .
     
  13. skybolt58

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    *EPT069610Z (Galaxy DX959/949/2547, Texas Ranger 696F SSB, 696F, 396, 936, 966)
    -Lift end of R266 that connects to D103 and C233. Solder the banded end in the empty hole where resistor was lifted and solder the other end of diode to lifted end of resistor. (CORRECTION submitted by Mav391: Cap number is C233, not C133 as earlier listed - Thank you for the updated info!)



    I have done this Swing mod on my 959 and TR696F it is NOT R266 IT IS R264!

    and it works Great.
     
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