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WVARS Winter 2021/22 Project

RF Signal Generator

At the club in November, we started to build our winter construction project, an handheld RF Signal Generator.  Most of us completed the build in the 2 hours we were at the club, and all worked which is always great to see. 

Help will be on hand at our meeting on Monday 17th January 2022 to get the remaining kits finished off and tested.  So please remember to bring them along and for those that completed the build in November, please still bring yours along to have the latest software uploaded to them and have them tested.

Hope to see you on 17th January 2022.  Doors open at 7pm and remeber to bring your soldering iron and hand tools along.

Welland Valley Amateur Radio Society Winter 2021/22 Construction Project - RF Signal Generator.

(1) What is it?

An RF signal generator that produces a signal from 10kHz to at least 200MHz.

The power output can range from 10mW to a few uW making it suitable for many purposes from

a temporary Local Oscillator to a receiver test signal. It's intended to be a useful bit of test equipment in the shack.

The signal is normally non-modulated CW.

Included is the ability to send a short CW modulated message of 32 characters. This message can be 

edited into the source and is non-volatile and repeating, so the unit becomes a CW beacon.

Control of the functions is by a rotary encoder and two push buttons. There is a 4 X 16 character OLED 

display. RF output is by 3 SMA connectors.

The power source is a PP3 type 9V battery.


This is a picture of the prototype.

(2) How easy is it to build ?

The unit has been designed to be easy to put together. Everything mounts on a single PCB.

There are no Surface Mount components to solder. It's all Thru Hole apart from the SMA connectors.

They solder to the top end of the PCB. There are some fairly small parts, but nothing too bad.


This is the PCB, and yes they really are this colour.

This drops straight into a 60 X 100mm plastic box.

The box has pre-cut holes for the connectors, and the lid of the box is pre-cut for the

display and the controls. The code is pre-installed on the 28 pin IC, so it all should just work.

I reckon it should be a relaxing 2 hour build. No need to rush.

(3) What does it cost

The complete kit costs £12. This includes everything apart from a PP3 type (MN1604) battery.

(4) What tools do I need to build it


Small soldering iron and suitable solder

Small cross head screwdriver

Small flat end screwdriver

Pair of small wire cutters

Useful to have:-

Tweezers/Small pliers

Good light source and suitable extension cable

Multimeter for testing

Tim (G8JFX)

Local ADS-B Flight Tracking Receiver

Uses a Raspberry Pi Zero with an RTL-SDR dongle, both installed together in a 40mm PVC pipe and powered from 5vdc in the loft of G1IVG.

Click Here to Track Flights

Getting Started with CW by Andy G0SFJ

Below are three MP3 files created by club member Andy Thomas (G0SFJ) to get you started with learning CW.  Paul G0SFJ and Colin G1IVG are trying to learn the code, so don't be afraid have a go with the files below and together with Andy's support we should be able to make a short QSO using CW before too long. 

Lesson 1    (10 mins)

Lesson 2    (15mins)

Lesson 3    (15 mins)

DMR Repeater GB7WV located in Mkt Harborough

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