On 30 June 2010 13:40, Jim Thomson <jim.thom@telus.net> wrote:
> Ok
>
> What's the exact procedure for finding the ..'1db compression point' on a
> HF amp ??
>
> I have conflicting info on the procedure. With hardly any drive, the typ HF
> amp has a
> lot of gain. As drive levels increase, the gain goes down. Question
> is.... where is the
> starting point of all this?? With 1 watt of drive... or 5w or what ? It
> makes a big diff
> to the results.
The gain should first be measured with low-level signals (mW range).
Then find where the gain has falled by 1 dB.
That probably will give you a figure well below what you want to to
use, but that is the 1 dB compression point.
Basically, all this shows is that it is not a very relevant parameter,
in much the same way as the S-parameters of the amplifier are of no
practical use.
Dave
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