Gary Schafer wrote:
> Good point Karl-arne.
> Because of this it is important to keep the signal level relatively low
> into the receiver. 40 over S9 is probably pushing it on input level.
>
> An easy way to tell about receiver IM is to use two signal generators
> set at the same level a couple of Khz apart fed into the receiver.
> Measure the 3rd order product by comparing the difference between its
> level and one of the signal generator signals the same as described for
> measuring the transmitter.
> This gives a two tone signal to the receiver with no IM products on them.
Don't take that for granted! Depending on the levels, good generators
with a good combiner should be ok, but I've seen people assume that and
then spend time chasing problems that were in the source signals, not
the amplifier.
Steve
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