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Royce cb

Discussion in 'CB and Export Equipment and Accessories' started by Ziploc, Jun 28, 2020.

  1. Ziploc

    Ziploc Member

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    Morning, this was given to me . I kinda like how it looks. Can this be modded to talk? It’s probably mid 70s


     

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  2. snow bird

    snow bird Well-Known Member

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    Look it up it can Be Inproved if you Try
     
  3. Dmans

    Dmans Sr. Member

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    Anything can be “modded to talk”.
    How deep are your pockets?

    73
    David
     
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  4. Tokin

    Tokin 42Zero Tampa

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    The Royce mobile model you want to put your time into imo is the 1-632 40 channel ssb radio. That was their top of the line back in the day. Be ready for a recap job for sure. They were a classy cb of their day.
     
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  5. NZ8N

    NZ8N Well-Known Member

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    Royce's modular board design was a pain in the ass to work on.
     
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  6. Tokin

    Tokin 42Zero Tampa

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    Yes every tech i ever sent a royce to pitched a fit and usually wound up calling it "that fucking royce" lol.
     
  7. NZ8N

    NZ8N Well-Known Member

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    The trick was, you desolder the pins of whatever daughterboard you were going to work on, remove it, then flip the radio over and solder the daughterboard on the back side (solder side) and solder it there. Leave enough space from the main board so it is not a pain to desolder the daughterboard to put it back.
     
  8. nomadradio

    nomadradio Analog Retentive

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    I can't make out the model number. I can tell you that this is what they used to call a "3-knob" CB. Reason is obvious enough, but this represents the absolute bare-minimum controls on the front panel. Channel, squelch and volume. As a result, the lowest-priced model in any brand-name's product line.

    Models with more knobs may or may not perform even one lick better than the 3-knob. They did cost more than a 3-knob radio.

    The nitty-gritty of what to do about the 'factory' modulation level depends on the model number. If the info is out there, that's how it's identified, This is the one single thing that makes the most difference on the air.

    73
     
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  9. Ziploc

    Ziploc Member

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    Royce 1-648
     
  10. snow bird

    snow bird Well-Known Member

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    C B tricks has all you need to Get it right
     
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  11. sunbulls

    sunbulls Sr. Member

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    Used as a backup radio, for practical purposes it may not require anything further. I’d try the radio first before thinking about doing any adjustments. If you’re thinking about using it far into the future, a radio that old should first have all the electrolytic capacitors replaced. Alignments should be made after that’s done. At least that model doesn't have any modular boards to deal with.
     
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  12. nomadradio

    nomadradio Analog Retentive

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    Bad news. The 1-648 uses a peculiar circuit for the final-amplifier transistor called an "emitter follower". Probably makes it stand up to high SWR before being damaged by it.

    But this circuit will NOT swing, or show forward modulation worth a nickel.

    Fortunately very few radios use this circuit.

    But you have one of them.

    73
     
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  13. NZ8N

    NZ8N Well-Known Member

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    Also, the AMC does not sample the final and driver feed voltage, it uses a feedback loop to the mic preamp (dual op-amp) to control the modulation. VR3 sets the level. It is not listed in Secret CB.
     
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  14. Tokin

    Tokin 42Zero Tampa

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    That f:mad:cking Royce...
     

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