Several things...
One IRF510 spec is 100V breakdown.? More than that and poof.
Also sustained current should be 4A or less (the 5.6A is for
saturated switch mode).
So the question is why it it 100V P-P?? It suggests an open relay,
wrong band LPF selected or seriously bad SWR.? ?Last case is that
the Drain load (transformer) is too high.
100V P-P across 50 ohms is well over 25W,? if its across a 50 ohm
load thats about 35W.? At 13V that's pushing the device really hard
to saturation most likely.? Load current at that power is likely near
a indicator and heating will be significant (for small heatsinks) if linear.
I have several linears using IRF510 mosfet, and I do not see that.
Be wary as when the die heats the gate threshold decreases at
roughly 10mv/degree-C and at that power its likely 100C++ if
not higher.
--
Allison
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Please use the forum, offline and private will go to bit bucket.
