[Collins] 30L-1 Parasitic Suppressors

[Dr. Gerald N. Johnson, electrical engineer]

The carbon composition resistors drifting high in value with age,
humidity, and heat is the most likely root cause. Check for any in the
cathode circuit and be sure their resistance hasn't also risen.

Selecting the inductance and resistance of a parasitic suppressor is
always a trade off between power dissipated and effectivity. The greater
the resistor value, the better the suppression, but the more power
wasted.

Since carbon composition resistors tend to drift high in value,
eventually they dissipate more power than they can hack, then they
smoke.

73, Jerry, K0CQ, Technical Advisor to the CRA
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Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.