ozQRP CDV, Construction Manual

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CDV Construction Manual – Issue 3 Page 4
1 I
NTRODUCTION
The CDV (Compact Digital VFO) is a variable frequency oscillator suitable for homebrew radio
transceivers and general signal generator applications. The CDV is built on a very small PCB that
holds all parts including the rotary encoder and OLED display.
The CDV can simultaneously generate two separate signal sources. The first output has a fixed
frequency while the second is a variable frequency source using a rotary encoder as the control.
The outputs are square wave but can be conditioned by an optional add-on attenuator/low-pass
filter board.
1.1 CDV
FEATURES

Two simultaneous outputs. One variable frequency and one fixed frequency.
 User programmable frequency steps.

BFO fixed output feature provides a replacement for a crystal in superhet rigs.

Simple and flexible configuration through on screen menus.

Clear and bright low current OLED display.

Very small overall size.

Simple control via a rotary encoder and two small pushbuttons.

Low power consumption.

Wide frequency range.

IF offset function.

Scanning function.

Receiver incremental Tuning (RIT).

RX/TX indication.

USB/LSB indication.

Power supply voltage display.

Automatic frequency adjustment when changing sidebands.

Calibration of frequency and voltage display.

Low power supply voltage warning.

Easy mounting using the rotary encoder shaft.

PCB comes with all SMD parts pre-loaded.
Assembly is quick and easy as most of the components are surface mount (SMD) and come pre-
installed on the PCB. There are only a handful of through-hole parts to install.
A kit of parts for the CDV including everything you need is available from www.ozQRP.com .