UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

G8HQP Dave · 26th Jan 2018, 5:11 pm

Radio books from the 1960s or early 70s may be the best source of information on building stable VFOs. Before that people were more likely to be 'rock-bound' (crystal osc). After that synthesisers started appearing.

My guess is that much of the drift comes from the coil. Reducing the oscillator amplitude might help. Good VFO coils were usually purpose-built.

26th Jan 2018, 5:11 pm	#4
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: Compensating for VFO drift Radio books from the 1960s or early 70s may be the best source of information on building stable VFOs. Before that people were more likely to be 'rock-bound' (crystal osc). After that synthesisers started appearing. My guess is that much of the drift comes from the coil. Reducing the oscillator amplitude might help. Good VFO coils were usually purpose-built.