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Royce cb
- Thread starter Ziploc
- Start date
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.
Yes every tech i ever sent a royce to pitched a fit and usually wound up calling it "that fucking royce" lol.
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.
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
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
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.
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
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
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.
cking Royce...