[Top] [All Lists]

Re: [Amps] Measuring IMD in a home workshop

To: <>
Subject: Re: [Amps] Measuring IMD in a home workshop
From: "Jeff DePolo" <>
Date: Mon, 20 May 2019 17:19:51 -0400
List-post: <>
> 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

                                        --- Jeff WN3A

This email has been checked for viruses by Avast antivirus software.

Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>