[Amps] Designing the Cleanest Linear with RF Negative Feedback

[Steve Thompson]

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