UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Using theTECSUN AN-200 AM MW Tunable Medium Wave Gain Loop

Andrew2 · 15th Oct 2021, 12:32 am

If the noise isn't nulling out sufficiently on the loop, a carefully introduced amount of noise from the wire may win you a useful reduction, but it will take some experimentation with the positioning of the wire. The distance of the wire from the loop will alter the amplitude of the noise injection, and the side of the loop the wire is on will reverse the phase.
Once you hear a reduction in the noise a slight rotation of the loop will 'fine tune' it. If the loop is tunable, this will also affect the phase.
My first experiments were along these lines, but I used a rather more 'built up' arrangement than you have at the moment. Good luck.

15th Oct 2021, 12:32 am	#4
Andrew2 Nonode Join Date: Mar 2010 Location: Dukinfield, Cheshire, UK. Posts: 2,037	Re: Using theTECSUN AN-200 AM MW Tunable Medium Wave Gain Loop If the noise isn't nulling out sufficiently on the loop, a carefully introduced amount of noise from the wire may win you a useful reduction, but it will take some experimentation with the positioning of the wire. The distance of the wire from the loop will alter the amplitude of the noise injection, and the side of the loop the wire is on will reverse the phase. Once you hear a reduction in the noise a slight rotation of the loop will 'fine tune' it. If the loop is tunable, this will also affect the phase. My first experiments were along these lines, but I used a rather more 'built up' arrangement than you have at the moment. Good luck. __________________ Andy G1HBE.