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The first SSB CB radios had a 'locked' clarifier.

That is, the knob controls both the transmit and receiver frequency. In this sense they are "locked" together on the same knob.

Some time between 1973 and 1974 the FCC tightened the rule to make the front-panel fine-tune knob a receive-only function. This made it necessary to include a separate trimmer adjustment inside the radio to set the transmit frequency on channel. Every SSB CB approved to sell after that date has this separate transmit-side trimmer and a receive-only fine-tube knob on the front panel.

Pretty sure this radio was built before that rule took effect.

And radios that were on the market both before and after that rule may have dotted lines in the schematic diagram, showing both the original 'locked' radio and the later circuit with a separate transmit-frequency adjustment.

The Console 2 schematic doesn't show any separate transmit-side adjustment for the crystals.

73

<blockquote data-quote="nomadradio" data-source="post: 642121" data-attributes="member: 22">The first SSB CB radios had a &#039;locked&#039; clarifier. That is, the knob controls both the transmit and receiver frequency. In this sense they are &quot;locked&quot; together on the same knob. Some time between 1973 and 1974 the FCC tightened the rule to make the front-panel fine-tune knob a receive-only function. This made it necessary to include a separate trimmer adjustment inside the radio to set the transmit frequency on channel. Every SSB CB&nbsp; approved to sell after that date has this separate transmit-side trimmer and a receive-only fine-tube knob on the front panel. Pretty sure this radio was built before that rule took effect. And radios that were on the market both before and after that rule may have dotted lines in the schematic diagram, showing both the original &#039;locked&#039; radio and the later circuit with a separate transmit-frequency adjustment. The Console 2 schematic doesn&#039;t show any separate transmit-side adjustment for the crystals. 73</blockquote>

[QUOTE="nomadradio, post: 642121, member: 22"] The first SSB CB radios had a 'locked' clarifier. That is, the knob controls both the transmit and receiver frequency. In this sense they are "locked" together on the same knob. Some time between 1973 and 1974 the FCC tightened the rule to make the front-panel fine-tune knob a receive-only function. This made it necessary to include a separate trimmer adjustment inside the radio to set the transmit frequency on channel. Every SSB CB approved to sell after that date has this separate transmit-side trimmer and a receive-only fine-tube knob on the front panel. Pretty sure this radio was built before that rule took effect. And radios that were on the market both before and after that rule may have dotted lines in the schematic diagram, showing both the original 'locked' radio and the later circuit with a separate transmit-frequency adjustment. The Console 2 schematic doesn't show any separate transmit-side adjustment for the crystals. 73 [/QUOTE]

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