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President washington cB radio

Discussion in 'CB and Export Equipment and Accessories' started by Se7en, Aug 20, 2011.

  1. Se7en

    Se7en Well-Known Member

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    Just picked it up for $25.00
    Replacing the meter light since its burnt out, with an led.
    Haven't had a chance yet to use it waiting for a mate to bring a 5 pin mic. This one has rx and TX light. 3 push buttons mod, Chan 19(doesn't work) and another button forgot what it was. What pot is the modulation pot? Vr8? And also radio has ssb. Its almost minty. Cheers



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  2. ExitThirteen

    ExitThirteen Grumpy, Cranky Repairman

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    That should have the MB8719 chassis in it if it's 3 button.

    VR7 controls SSB output, Clip R104 or change R104 to a 100k ohm resistor to open up AM modulation.

    The 3 buttons should be Mod/RF, NB/ANL, and Channel 9.



    ~Cheers~
     
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  3. #3
  4. Se7en

    Se7en Well-Known Member

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    hi, thanks. where is the deadkey pot? cant find it need to turn it down its 5w which is too high for my needs. ??? so which one does am and which one does am modulation?

    says P400 on front of radio the channel 9 button doesnt work which im not concerned about,
     
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  5. Robb

    Robb Yup

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    IF your Uniden Washington has the 8719 PLL chip in it; then:

    VR1 Signal meter
    VR2 Squelch
    VR3 TX Frequency
    VR5 Carrier balance
    VR6 AM power
    VR7 ALC
    VR8 Driver Bias
    VR9 Final Bias
    VR10 RF power meter
    VR12 Modulation meter
    L1 Noise blanker
    L2 Noise blanker
    L3 I.F. 1st stage
    L4 I.F. 2nd stage
    L5 RX (6th stage)
    L6 RX (5th stage)
    L7 RX mixer output (4th stage)
    L8 RX (3rd stage)
    L9 RX (2nd stage)
    L10 RX (1st stage)
    L13 VCO
    L14 VCO output
    L17 AM offset frequency
    L18 Loop mixer
    L19 LSB loop frequency
    L20 AM loop frequency
    L26 TX mixer input
    L27 TX mixer input
    L28 TX mixer output (1st stage)
    L29 TX (2nd stage)
    L36 TX
    L39 RFI low pass filter trap
    CT1 USB offset frequency
    CT2 LSB offset frequency
    CT3 USB loop frequency
     
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  6. Se7en

    Se7en Well-Known Member

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    ok just found out that the radio is transmitting between freqs??? im not sure what to do now?
     
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  7. Robb

    Robb Yup

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    *Check to see if the clarifier is unlocked and has a lot of khz range/change.

    *Look for a switch. Might be one of the panel switches.

    *Might need alignment.
     
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  8. Se7en

    Se7en Well-Known Member

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    ok on AM the clarify must be all the way to the right or im off freq. on ssb its very touchy and slides like 7 channels up and down :( needs a re alignment. so i figured it out the clarify does this, if im on 20 and need to go to 19A i just put the clarify at 12 o clock, need to go to 19 just all the way to the left.
    channel 9 does not work...? and with the NB/ANL pushed in i cant transmit nor do i receive? weird part is inside it does not looked hacked or butchered up.
     
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    Last edited: Aug 21, 2011
  9. UnrealStunner

    UnrealStunner Active Member

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    #9
  10. Se7en

    Se7en Well-Known Member

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    #10
  11. ExitThirteen

    ExitThirteen Grumpy, Cranky Repairman

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    I sent you a PM. If it says P400 on the front it's a different board in there. If memory serves me right, it should have a D2824 PLL board in there. Get back to me when you can.


    ~Cheers~
     
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  12. loosecannon

    loosecannon break on through

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    morse,

    your washington is the MB8719 version if it has the 5 pin mic plug on it.

    dont use the info unrealstunner gave you, its for the upd858 washington.
    LC
     
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