1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
    Dismiss Notice

Colt 485 Black Shadow

Discussion in 'General CB Services Discussion' started by Diggity Dawg, Jun 13, 2018 at 7:18 PM.

  1. Diggity Dawg

    Diggity Dawg New Member

    Joined:
    Wednesday
    Messages:
    1
    Likes Received:
    0
    I picked up a Colt 485 in some auction stuff. It receives but doesn't appear to transmit. Is it worth getting fixed?



    Thanx
    John
     

  2. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    1,505
    Likes Received:
    928
    If it was a 1978 Plymouth Valiant, you might hesitate at the cost to rebuild it. A cheap fix-up probably would not make it into a daily driver after 40 years.

    This radio may have a lot of miles on it, but there's no odometer to tell that. A high-mileage radio might need a double handful of small electrolytic capacitors replaced, or just one or two to get it running. Replacing every one of them is a "restoration". Replacing only the ones that go bad is more like a "repair".

    How many original hoses and belts would you try to keep using in that Valiant?

    Years ago we had a stack of this model and the 480, all with a bad VCO module. Couldn't buy that part. Good chance the radios got ditched years ago.

    Sams CB volume 227 is the only source of service info I know for that one.

    A check to see that the PLL is locked onto the channel you select is a good place to start. The radio will lock out the transmitter if the radio has jumped to a frequency that's not legal. If your radio has the chronic VCO problem, it can cause this symptom.

    Have you checked to see that the radio is receiving the channel that it should be? If not, the radio's transmitter may just be locked out as a result.

    73
     
  3. 357

    357 Walkin' the dog

    Joined:
    Sep 12, 2009
    Messages:
    882
    Likes Received:
    255
    could be just the mic.
    Jump pin 2 and pin 4 and see.

    2017105.jpg
     
  4. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    1,505
    Likes Received:
    928
    Much smarter to try the simple stuff first. Mikes tend to break sooner than radios.

    The pin number in this pic are correct if you are looking into the open end of the plug on the end of the mike cord.

    Looking at the socket on the front of the radio from the outside, the upper-right should be pin 1, with pin 2 at the upper-left. Pin 3 the lower-left and pin 4 the lower right.

    I think.

    I am pretty sure that shorting pin 2 to 4 is correct to get a transmit carrier if the mike is the root of the problem.

    73
     
    357 likes this.
  5. 357

    357 Walkin' the dog

    Joined:
    Sep 12, 2009
    Messages:
    882
    Likes Received:
    255
    ya never know...
     
  6. OldTech03

    OldTech03 Active Member

    Joined:
    Dec 15, 2017
    Messages:
    130
    Likes Received:
    91
  7. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    1,505
    Likes Received:
    928
    Those have only been around for a few years now. I did put some of what that guy sells in stock for the next time someone wants one fixed.

    There are a handful of variations in various Cybernet SSB CB radios, and a few that are unique to export or overseas-standard models.

    These do work for the models they fit. The original modules are potted, so there's no good way to fix them.

    His modules have brought a handful of old Cybernet radios back to life here.

    73
     
  8. 357

    357 Walkin' the dog

    Joined:
    Sep 12, 2009
    Messages:
    882
    Likes Received:
    255
    hopefully not the vco
     
  9. OldTech03

    OldTech03 Active Member

    Joined:
    Dec 15, 2017
    Messages:
    130
    Likes Received:
    91
    I actually Have done this as I had a really nice midland SSB/AM base 78/999 It was in mint condition and the only problem it had was the VCO Block so no choice I had to fix it. The most important thing with these is being patient and methodical in the approach otherwise it's pretty straightforward.
     
  10. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    1,505
    Likes Received:
    928
    And incredibly labor intensive.

    Hats off to anyone who gets one of these back on the air!

    73
     

Share This Page

  • About Us

    The WorldwideDX Radio Forum was originally established in 2001. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site.
  • Like us on Facebook

  • Premium VIP Member

    The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? We'd really appreciate it!

    Donate to us!