[Elecraft] K2 drif problems?

[John, KI6WX]

The RF voltage across a varactor diode can modulate the capacitance.
However, the modulation rate is related to your RF frequency.  This means
that you will generate energy at harmonics of the RF signal due to the
capacitance modulation.  Taking advantage of this effect,  you can use
varactor diodes to make a frequency multiplier.
-John
 KI6WX

From: "Edmund H. Ramm" <ehramm@dk3uz.shnet.org>
To: <elecraft@mailman.qth.net>
Sent: Thursday, December 19, 2002 11:28 AM
Subject: Re: [Elecraft] K2 drif problems?

>
>    A varactor's capacity is controlled by the (reverse) bias, the
> higher the voltage, the lower the capacity, right? The rf voltage
> across the tuned circuit's capacitor (said varactor) constantly adds
> or subtracts itself to/from the bias voltage once per half wave. To
> me this means a varactor controlled oscillator must output a whole
> frequency band, i.e. lots of noise sidebands.
>