In a radiotelegraph transmitter with a DC...

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Question 1 of 20GU3ZQCZgBjERmZwqOKBd

In a radiotelegraph transmitter with a DC generator plate voltage source, an AC generator filament supply, and grid-bias keying, what could be wrong when the emission continues with the key contacts open?

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Question 1 of 20

GU3ZQCZgBjERmZwqOKBd

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🔍 Key Concepts

• Grid-bias keying in a radiotelegraph transmitter and how the key affects grid bias voltage • What happens to tube conduction/emission when the grid does not receive enough negative bias • How a short circuit in bias components or filters could bypass the keying control

💭 Think About

• When the key is open, what should normally happen to the grid bias and the tube current? Think about whether the tube should conduct or be cut off. • For each fault listed (insufficient grid blocking bias, shorted bias resistor, shorted key-click filter), ask: would this fault tend to let the tube keep conducting even when the key is open? • Consider whether each listed condition is mutually exclusive or whether more than one of them could produce the same symptom of continuous emission.

✅ Before You Answer

• Verify what "insufficient grid blocking bias" means in terms of grid voltage being negative enough to stop plate current. • Check what a shorted bias resistor would do to the bias voltage path and whether it would keep the tube on all the time. • Check whether a shorted key-click filter would effectively bypass the keying circuit, allowing RF output even when the key contacts are open.

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