[Elecraft] KX3 and KPA1500 compatibility

[Steve L]

> Regarding the question about KX3-->KXPA100-->KPA1500:  Be careful.  All amplifiers generate some distortion that wasn't present at the input. Each succeeding amplifier amplifies that distortion.

There are a couple of interesting articles here that discuss the design, construction and use of filters between transmitter and amplifier designed to prevent the amplification of the “junk” - unwanted harmonics and phase noise from the transmitter:

https://kitsandparts.com/W3NQN_filter.php

I've seen several QST reviews recently with lab notes to the effect “not recommended for use with an amplifier” because of the uncleanliness of the transmitted signal.  This is an issue of increasing concern given some of the dirty signals we’ve all heard on the air.

Steve
AA8AF