It’s practical to build a VFO that operates directly on 160 meters (1.8 to 2.0 MHz) or on 80 meters (3.5 to 4.0 MHz). This makes a CW transmitter design simple.

This time I will show you how to make a VFO that covers the range from 100 KHz to 160 MHz and uses a minimum number of components. The selected frequency is displayed on a beautifully …

2022年11月19日 · A variable frequency oscillator (VFO) is a necessary component in any tunable radio transmitter or receiver. This time I will show you how to make a VFO that covers the …

2016年5月28日 · So I started with grand plans, to build a nice stable but cheap varactor controlled VFO about a month ago that tuned ~7.000-7.040 MHz. Cheap instantly excludes large air …

Cheap and easy-to-build VFO device that is almost indispensable in radio engineering, especially in DIY radio receivers. A Variable Frequency Oscillator (VFO) is an electronic oscillator whose …

In the old days, it was customary to build a VFO for 1.8 to 2.0 MHz or 3.5 to 4.0 MHz. Then for higher frequencies, we ran the signal through successive frequency multiplier amplifiers to get …

2016年11月5日 · In this article i will briefly take you to quickly build a simple vfo and then gradually improve it with complexities. There are several articles and libraries available with …

These videos show my experiences with DDS VFOs. Whether you buy, build from a kit or design from scratch I can highly recommend DDS as a worthwhile and versatile amateur radio …

2025年2月8日 · One simple solution was to build a low frequency VFO and upconvert to a higher frequency with a high frequency crystal oscillator with good stability. The resulting output will …

2015年5月20日 · This is the story of my quest to build an all-tube VFO for 26.0 to 26.5MHz, for use in a 21MHz SSB/CW superhet transceiver with 5.0688MHz intermediate frequency (IF). …