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That's a good start but at the very least it would still need added voltage regulation. It may also require more than just a 1N4148 diode to properly track the thermal variations in linear operation. Although, I'm not familiar with the characteristics of this particular transistor, what I can say is it is more difficult to sense the die temperature through a plastic cased transistor.

When this is right, you can set the IDQ for 100ma, apply a full power sustained carrier and as soon as the carrier is removed, the IDQ will instantly return to 100ma. It is not uncommon for the the IDQ to be noticeably higher until the die temperature cools.

[QUOTE="Shockwave, post: 724552, member: 10882"] That's a good start but at the very least it would still need added voltage regulation. It may also require more than just a 1N4148 diode to properly track the thermal variations in linear operation. Although, I'm not familiar with the characteristics of this particular transistor, what I can say is it is more difficult to sense the die temperature through a plastic cased transistor. When this is right, you can set the IDQ for 100ma, apply a full power sustained carrier and as soon as the carrier is removed, the IDQ will instantly return to 100ma. It is not uncommon for the the IDQ to be noticeably higher until the die temperature cools. [/QUOTE]

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