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Stryker 447hpc2 question

Discussion in 'CB Radio Modifications' started by zman350, Jun 26, 2021.

  1. zman350

    zman350 Member

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    Can someone please help me out on this,how can I increase the modulation and how about a npc mod.thanks


     

  2. sp5it

    sp5it Master of puppets

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    Link me schematic, I could help in that matter.
     
  3. zman350

    zman350 Member

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    It doesn't have a pot for the mod,and at 2 watts it only swings 5,so it definitely needs a swing kit,I just need to know where it goes.thanks,I'll get the link
     
  4. zman350

    zman350 Member

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  5. sp5it

    sp5it Master of puppets

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    C189 is a spot to place diode/resistor combo.
    R249 AM limiter
    VR14 am mod pot

    Change R241 to 15 Ohm.
     
    Shadetree Mechanic likes this.
  6. snippits75

    snippits75 Well-Known Member

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    I have a 447 HPC2. You don't need to modify it. It just needs a tune from a tech that has the proper equipment.

    From a two watt dead key, my radio does round about 30 to 35 watts peak. Yes I will agree these radios are low on modulation from the factory. But with a tone my tech said it was doing 99% modulation from the factory.

    If you need it to swing 60 watts from say two watts dead key, then yes it will probably need some type of a mod. I run a four transistor Toshiba 2879 base amp, and the radio works great with the amp now.

    Radio itself turned wide open does about 60 peak clean watts...no flat topping with plenty of modulation.
     
  7. zman350

    zman350 Member

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    I'm sorry that's the wrong schematic, that for a 447,I need a 447hpc2,thanks in advance
     
  8. Low_Boy

    Low_Boy Sr. Member

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    I believe the HPC and HPC2 are different radio and boards. The HPC2 is the new smaller version.
     
    NZ8N likes this.
  9. sp5it

    sp5it Master of puppets

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    What is marking on PCB than?
     
  10. Low_Boy

    Low_Boy Sr. Member

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    I do not have either here. I do know the HPC2 is a small size radio. Same size as a cobra 25. The HPC is a full size radio. The owner of the radio should do his homework.
     
    sp5it likes this.
  11. NZ8N

    NZ8N Well-Known Member

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    shows the difference between the HPC and the HPC2


    Lester said it looked like an Anytone AT6666 inside.
    At the 11 minute mark, he shows that the Mod Limiter adjustment W501 5k SMT pot is missing, and has a 0 Ohm SMD resistor across 2 of the pads. He said it was wide open?

    Good readable schematics for the Anytone AT6666 or CRT SS9900
    https://simonthewizard.files.wordpress.com/2020/10/schematic-at6666-team-1012-crt-9900-v3.pdf
     

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