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Thanks for the replies.

I know Zetagi is poor, but I got this very cheaply at £20 (circa $30).

I don't intend testing it with 1KW, as my 220W amplifier (Zetagi B550p) is more than ample for my needs. Besides, my antenna will only take 250W before it's toast.

I've tested this Zetagi dummy load at 220W for 3 minutes, and the SWR remained at 1.1:1 - but I'm trying to establish just why the SWR stayed good even though the dummy load resistance dropped to around 35 ohms after heating up.

Should a resistor of the type in my dummy load drop in resistance like this, and why is the SWR still showing as good (1.1:1) when it does?

I'm looking forward to somebody with some technical "knowhow" to please give an explanation as to how this is happening.

[QUOTE="Dereka5, post: 767478, member: 61186"] Thanks for the replies. I know Zetagi is poor, but I got this very cheaply at £20 (circa $30). I don't intend testing it with 1KW, as my 220W amplifier (Zetagi B550p) is more than ample for my needs. Besides, my antenna will only take 250W before it's toast. I've tested this Zetagi dummy load at 220W for 3 minutes, and the SWR remained at 1.1:1 - but I'm trying to establish just why the SWR stayed good even though the dummy load resistance dropped to around 35 ohms after heating up. Should a resistor of the type in my dummy load drop in resistance like this, and why is the SWR still showing as good (1.1:1) when it does? I'm looking forward to somebody with some technical "knowhow" to please give an explanation as to how this is happening. [/QUOTE]

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