Mod-VFO Drehrichtung_en.docx
January 28, 2019, ©
Elcon
, Switzerland
Seite 3 / 7
1
Introduction
Normally you are used to turning the VFO knob clockwise increasing the frequency and vice
versa. With the FT-301D it is just the other way around and therefore very unusual.
This is due to the frequency conditioning of the FT-301.
Figure 1
As shown in Figure 1, the VFO frequency is subtracted from the crystal frequencies for the
different bands (Band Crystal). Thus, the VFO frequency runs in opposite direction to the
premixer frequency and thus also to the transmit frequency (Tx frequency).
Figure 2
The variable capacitor of the VFO is designed in such a way that the rotor plates turn out
clockwise and thus the capacity decreases -> the frequency of the VFO increases -> the Tx
frequency decreases.
As shown in Figure 2, the fiber glass spreaders on the two rotor plate packs prevent them
from being turned counterclockwise beyond the maximum capacity. However, this would be
absolutely necessary to reverse the frequency to the direction of rotation.
Spreader
