UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Questions on 160/80 metre AM transmitters.

Radio Wrangler · 21st Dec 2022, 4:05 am

Ah, but there is the anode-to-ht inductor of that same second EF80, so you get a tapped tank, not a simple series one. Two inductors are in play.

The circuit has both a series mode resonance and a parallel mode resonance.

Alternatively, if that series mode capacitor is big enough to be a decoupler, you could see the new inductor introduced when the switch is closed as being simply jammed across the EF80 anode inductor.

David

21st Dec 2022, 4:05 am	#38
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,902	Re: Quick question on the CODAR AT5, if anyone has one to hand. Ah, but there is the anode-to-ht inductor of that same second EF80, so you get a tapped tank, not a simple series one. Two inductors are in play. The circuit has both a series mode resonance and a parallel mode resonance. Alternatively, if that series mode capacitor is big enough to be a decoupler, you could see the new inductor introduced when the switch is closed as being simply jammed across the EF80 anode inductor. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done