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[Amps] Real time tests to see if an RF transformer is saturating?

To: "amps@contesting.com" <amps@contesting.com>
Subject: [Amps] Real time tests to see if an RF transformer is saturating?
From: Chris Wilson <chris@chriswilson.tv>
Reply-to: Chris Wilson <chris@chriswilson.tv>
Date: Sat, 13 May 2017 19:06:59 +0100
List-post: <amps@contesting.com">mailto:amps@contesting.com>

  13/05/2017 19:04

Hi. Two off 1kW quasi Class D push pull FET amps on 136khz feeding a
Wilkinson combiner via the amps own output transformers designed for a
50 ohm load. Combiner built from plans for one to combine two 500 Watt
amps. Combiner's output transformer is three stacked FT-240-77 ferrite
toroids, 5 turns 12 AWG enameled (2mm OD) wire primary. Secondary is 7
turns of the same wire. The combiner feeds a big LPF bank. At full
power the combiner's toroids get hot quite fast with WSPR 2 signal
applied. Needs a small fan to stay within the realms of sensibility,
even then it creeps over 70C if left too long. How can I tell in real
time, with measuring instruments, if it's saturating, and if so what
cores might be more suitable please? Hopefully the schematic of the
combiner is linked. Many thanks! Chris 2E0ILY in the UK.

http://www.w1vd.com/137-500-500WCombiner.pdf

-- 
       Best Regards,
                   Chris Wilson.
mailto: chris@chriswilson.tv

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