[Amps] Measuring IMD in a home workshop

[Jeff DePolo]

> My problem regarding two or three tone tests is that my rigs all have
> comparably terrible IMD.  Several Ten Tec rigs, and a JRC 
> NSD-515.  None of
> them have spectacular IMD performance. How do you get around these
> limitations?

Two separate CW transmitters combined with high isolation between the two,
or two separate signal sources combined into an external low-IMD (typically
class A) amplifier used as a driver.

The former is typically the lower-cost solution as high-power low-IM
wideband amplifiers are not cheap, even on the used market.  But for
high-gain solid-state amplifier designs, the latter can be viable from a
cost standpoint when only need a few watts of drive into the DUT is
required.

					--- Jeff WN3A


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