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Re: [Amps] Question about SPE 1.3K-FA amplifier

Subject: Re: [Amps] Question about SPE 1.3K-FA amplifier
From: Kevin Stover <>
Date: Sun, 8 Nov 2015 08:30:01 -0600
List-post: <">>
W6PQL found when designing his HF SS amp that the LDMOS he was using would hit the 1dB compression point at about 11100W. If SPE is getting 1300W from one dual core device they are over driving it or they aren't using enough negative feedback to stabilize and reduce total gain.

On 11/6/2015 9:25 PM, Bill Turner wrote:
I notice the SPE 1.3K-FA amplifier is using a single LDMOS transistor
to achieve a peak of about 1500 watts output. I am wondering how they
do this and stay linear over the full 360 degree RF cycle. Normally
with a single-ended amplifier you have to either use a resonant tank
circuit to provide the "flywheel" effect, or run it class A. Solid
state amps normally use two devices in push pull but this amp does it
with only one.

Since SPE apparently does not provide schematics or service manuals, I
am left curious as to how they achieve linearity.


Does anyone know?

Educated guesses welcome.

73, Bill W6WRT

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R. Kevin Stover
FISTS #11993
SKCC #215
NAQCC #3441

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