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I currently have one of these same Royce 1-640 radios that I just repaired for a gentleman. I have the service manual for this radio, but not the owner/operater manual.
I installed a master receive/transmit crystal so he could use the radio on the upper channels on SSB mode.
A standard 11 meter (CB band) antenna will perform just fine with this radio.
But, it is still just a 23 channel radio .......
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