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President McKinley adjustments..??

Discussion in 'General CB Services Discussion' started by PA770, Sep 12, 2018.

  1. PA770

    PA770 W9WDX Member

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    I took the top off my new President McKinley radio and was looking to find the modulation pot.. to turn it up a hair, which must be RT206.. but what is PLC??

    I see AMC RT206, PLC RT202
    201 is the meter, 205 is drive bias
    204 is final bias, 501 is freq

    IMG_20180912_145122153.jpg
    Got AM-S and SSB-S, 101 is ASC

    IMG_20180912_145409898.jpg



    Anyone know the other pots??
    Is there an AM power pot?? I know some just say AM PWR, though I don't see it..

    Like I said I just want to tune up the AM modulation a tad.
     

  2. sonoma

    sonoma Sr. Member

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    after looking at the picture the PLC you mentioned would be the ALC. when they punched a hole in the circuit board it took one leg off the A for ALC.
    here is a link with the phone number of President in the US.

    https://president-electronics.us/

    after looking at the picture again it has CARR by one VR. that could be the carrier adjustment. have never worked on this radio before but the way it is marked it is fairly straight forward on the internal adjustments.
    does the front panel have an adjustment for high and low power for the radio?
     
    #2 sonoma, Sep 12, 2018
    Last edited: Sep 12, 2018
    sp5it likes this.
  3. jessejamesdallas

    jessejamesdallas Sr. Member

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    Check this video out...around 24:30 he tells ya where the Modulation and SSB pot's are at...On mine modulation was around 75% out of the box, and SSB about 6 or 7watts...After adjustments I now have full 100% modulation and 12w on SSB....This really is the only adjustments you should need to make with this radio.

    AMC is Modulation
    ALC (look's like PLC) is your SSB watts...adjust to 12w swing

     
    Shadetree Mechanic, kaos513 and PA770 like this.
  4. PA770

    PA770 W9WDX Member

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    My SSB is where yours was at when stock.. I can whistle to 6-7w on mine but that's it.. :(
     
  5. jessejamesdallas

    jessejamesdallas Sr. Member

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    Well...easy to get more out of it...just open it up, put on a strong pair of reading glasses or get a big magnifying glass, and turn up the ALC...just watch your meter when doing it, and stop at around 12 watts...You maybe able to get a little more than 12 watts out of it, but it might sound garbled to whoever your talking to on ssb...at 12 watts everyone said I sounded just fine.

    and if you haven't already done so, you really need to do the same thing with the AMC for the modulation...it made a big difference on my radio when I turned up the modulation.

    Those pot's are "tiny"...I mean "TINY"... even with two pairs of reading glasses on, and looking threw my magnifying glass at the same time, they still are tiny.
     
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  6. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    They are tiny and they don't have a stop. They just go all the way around. I turned up the modulation on my Anytone Smart and all the way up was 100%. Your results may vary.
     
  7. PA770

    PA770 W9WDX Member

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    Quarter turn cc got me closer to 10w with whistle.. did want to go over and my meter sucks.. this is after pic..

    IMG_20180912_194642714_BURST000_COVER_TOP.jpg
     
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  8. 9C1Driver

    9C1Driver Sr. Member

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    10 watts on SSB will be just fine for your TS350.
     
    PA770 likes this.
  9. loosecannon

    loosecannon Sr. Member

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    be careful when adjusting the AMC in these new president radios.

    the difference between 100% modulation and total box cars is very slight.

    You really need to adjust this with a scope. i have found them very touchy.
    LC
     
  10. PA770

    PA770 W9WDX Member

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    Just waiting to get new audio reports for SSB after adjusting.. my AM reports seem better with tiny modulation adjustment and it seems to swing more..

    The TS now swings better on SSB as well.. instead of 4-6 now going up to 8 on the TS meter with same settings and same volume of talk as before adjustment. If I whistle I can do 9.. but we don't want to do that and cook stuff.

    Also note I posted this for others to see inside..
     
  11. undertaker

    undertaker Undertaker

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    I have a NIB McKinley can I just run it with my tx star 250 stock no adjustments?

    Thanks
    Bobby
     
  12. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    Thank you for providing the pic...

    Here's a separate take on that but it may help answer why people are having issues with how the radio operates...

    There is a "zenering effect" that occurs with the bias method used - so it's designed to profile the gate voltage so the device stays in it's class of operation.

    There's nothing wrong with it, you need to be prepared for it when it engages.

    It's for a problem I call "hot gate" when the gate heats up from the switching and can't cool off readily and as quickly as the rest of the device can. This makes it act like it's overheated - and can latch on and stay on - the pic below helps you understand another SEPARATE issue or method I recommended for Varactor thermal tracking on another thread...
    HotGates.jpg
     
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  13. jessejamesdallas

    jessejamesdallas Sr. Member

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    You can...I was for a while when I first got mine, but my locals told me I sounded like I was talking on a walkie- talkie...plenty of dk, just no modulation, and that was using a 1x2 amp...adjusting the modulation pot. really made the radio come alive...went from swinging around 5 or 6 watts to almost a 10 watt swing made a noticeable difference on watts out of that 1x2....
     
  14. Dmans

    Dmans Well-Known Member

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    You'll probably have to take it out of the box first Bobby.:ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:

    (Along with the other 100 or so radios you have -"New In Box". Want to sell one of your Mark II's? I am interested!;))

    73's
    David
     
  15. undertaker

    undertaker Undertaker

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    Dmans love you man!!!:LOL::LOL::LOL::LOL: I have never been inside a radio can yall please guide me?

    Thanks Bobby
     
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