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This radio has an odd clarifier mod.

The clarifier has obviously been "unlocked", as R117, R119, and D30 all have one end lifted. R119 and D30 to isolate the clarifier from RX/TX voltages. I'm guessing R117 to get a little more range.

I can adjust the frequency of the AM oscillator in receive with either the clarifier knob or by adjusting CT6, which is as it should be.

I can adjust the frequency of the AM oscillator in transmit with the clarifier knob, but adjusting CT6 has no effect. This doesn't seem right.

Because the clarifier is unlocked, adjusting VR9 has no effect in transmit. Which is expected.

Transmit and receive are not the same frequency, they're about .5 kHz apart.

I did not check the USB or LSB modes, but it would be logical that they're doing the same thing. So fixing the problem for AM should fix it for them as well. If I'm wrong, well, not like it's the first time.

I have figured out that the clarifier control is getting 9.31 volts in transmit, and 9.21 volts in receive. This alone could be the explanation for the TX/RX frequency split. I've also figured out that the bad tech had a spool of white wire, because that's the color of two out three wires going to the clarifier pot. So for that, no cookie!

<blockquote data-quote="TM86" data-source="post: 644176" data-attributes="member: 41978">This radio has an odd clarifier mod.The clarifier has obviously been &quot;unlocked&quot;, as R117, R119, and D30 all have one end lifted.&nbsp; R119 and D30 to isolate the clarifier from RX/TX voltages.&nbsp; I&#039;m guessing R117 to get a little more range.&nbsp; I can adjust the frequency of the AM oscillator in receive with either the clarifier knob or by adjusting CT6, which is as it should be.I can adjust the frequency of the AM oscillator in transmit with the clarifier knob, but adjusting CT6 has no effect.&nbsp; This doesn&#039;t seem right.Because the clarifier is unlocked, adjusting VR9 has no effect in transmit.&nbsp; Which is expected.Transmit and receive are not the same frequency, they&#039;re about .5 kHz apart.I did not check the USB or LSB modes, but it would be logical that they&#039;re doing the same thing.&nbsp; So fixing the problem for AM should fix it for them as well.&nbsp; If I&#039;m wrong, well, not like it&#039;s the first time.I have figured out that the clarifier control is getting 9.31 volts in transmit, and 9.21 volts in receive.&nbsp; This alone could be the explanation for the TX/RX frequency split.&nbsp; I&#039;ve also figured out that the bad tech had a spool of white wire, because that&#039;s the color of two out three wires going to the clarifier pot.&nbsp; So for that, no cookie!</blockquote>

[QUOTE="TM86, post: 644176, member: 41978"] This radio has an odd clarifier mod. The clarifier has obviously been "unlocked", as R117, R119, and D30 all have one end lifted. R119 and D30 to isolate the clarifier from RX/TX voltages. I'm guessing R117 to get a little more range. I can adjust the frequency of the AM oscillator in receive with either the clarifier knob or by adjusting CT6, which is as it should be. I can adjust the frequency of the AM oscillator in transmit with the clarifier knob, but adjusting CT6 has no effect. This doesn't seem right. Because the clarifier is unlocked, adjusting VR9 has no effect in transmit. Which is expected. Transmit and receive are [B]not[/B] the same frequency, they're about .5 kHz apart. I did not check the USB or LSB modes, but it would be logical that they're doing the same thing. So fixing the problem for AM should fix it for them as well. If I'm wrong, well, not like it's the first time. I have figured out that the clarifier control is getting 9.31 volts in transmit, and 9.21 volts in receive. This alone could be the explanation for the TX/RX frequency split. I've also figured out that the bad tech had a spool of white wire, because that's the color of two out three wires going to the clarifier pot. So for that, no cookie! [/QUOTE]

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