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

1100 man · 17th Apr 2018, 2:26 pm

I like the sound of the frame gated AGC. I was reading up about 'sync cancelled' (I think that's the correct term) AGC and it looked rather complicated to implement. It required line sync pulses and a feed from the LOPT.
A long time constant will be fine for this application as it only needs to respond to slow amplitude changes rather then rapid signal variations due to atmospheric conditions.
It would be nice to experiment with a circuit already used by Ultra, so will be interesting to see it.
Many thanks
Nick

17th Apr 2018, 2:26 pm	#2
1100 man Octode Join Date: Apr 2016 Location: Ventnor, Isle of Wight, & Great Dunmow, Essex, UK. Posts: 1,377	Re: DC Restoration questions I like the sound of the frame gated AGC. I was reading up about 'sync cancelled' (I think that's the correct term) AGC and it looked rather complicated to implement. It required line sync pulses and a feed from the LOPT. A long time constant will be fine for this application as it only needs to respond to slow amplitude changes rather then rapid signal variations due to atmospheric conditions. It would be nice to experiment with a circuit already used by Ultra, so will be interesting to see it. Many thanks Nick