Where do you get this from?
In all radioes I have had the transmitted frequencie is the second harmonic of the TX Xtal...

In the article the author says TX work on 5th harmonic...? Strange.

The author also says you can step up/down 2 channels without retuning TX... This suits neither the strange rules in US, nor the rest of the world.

The authos says the reason for DobbeltSuper/DualConversion is to avoid "noice" from fellow pilots...? The reason why MPX developed DS RC-receivers a lot of years ago was mainly because noice/harmonics from the upper FM-band in Europa caused problems for the 35MHZ RC band. But the author at least do know the problems caused by reduced channel separation for broadcasting...

The author also claim: "Dual Conversion is needed for FM to eliminate in-band interference from other transmitter. " And in an other sentence he claims: "JR has taken note of this and their receivers stick with Single Conversion FM,"

I got myself a good laugh from this article