433 MHz CW signal source

Sat, 04 Oct 2025 00:00:00 +0000

For HF and amateur VHF bands our WiFi VFO works great.

But we didn't have a cost-effective UHF signal source until now…

Design

Thanks to Ismo (OH2FTG), we recently experimented with a HopeRF CMT2119A powered board called HOPERF RF module RFM119W-433S1.

Here is the CMT2119A powered board in action producing a CW (OOK) signal at ~433 MHz.

The stability is pretty good and a bit surprising considering that the board uses a 20ppm 26 MHz regular quartz crystal - not bad!

Sat, 05 Jul 2025 00:00:00 +0000

We make heavy use of Easy-Digital-Beacons-v1 for testing RF amplifiers.

This single board is a versatile WiFi VFO and FT8 / FT4 / WSPR beacon.

You can also use our CW-SigGen project to generate a suitable test signal.