I present you a silky smooth contactless VFO magnetic encoder, without any
clicks or play in the rotational axis.
The VFO magnetic encoder
consists of а hall effect sensor, neodymium magnet, stainless steel ball
bearing, and an aluminium knob.
You can easy install VFO
magnetic encoder to standard Chinese case for mcHF SDR radio.
VFO magnetic encoder characteristics:
Knob diameter: 38 mm / 1.5 in
Knob height: 16 mm / 0.63 in
Weight: 36 g / 1,27 oz
Resolution: 90 pulses per
Electrical Travel: Continuous
Supply Voltage: 5.0 VDC
Supply Current: 12 mA maximum
Output Voltage: 3.3 VDC
Wiring: WHITE (OUT B), BLACK
GND), YELLOW (OUT A), RED (+5V)
Please read important information about operation of the VFO magnetic encoder
in mcHF SDR radio:
VFO magnetic encoder
generates 90 pulses per rotation (ppr).
However, due to peculiarity
of the UHSDR Firmware your radio can handle only limited quantity of pulses per
second (about 60).
Due to this bug of UHSDR FW
for obtain of 90 ppr, you should rotate the encoder approximately 1.5-2 sec per
one turn or slower. Otherwise the UHSDR FW may skip some of the pulses.
VFO magnetic encoder DIY KIT included:
fully assembled and tested
VFO magnetic encoder;
all parts and wires you
needs to install VFO magnetic encoder to mcHF SDR radio.