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

AdrianH · 25th Dec 2022, 7:50 pm

Back to the Codar AT5 circuit, another question for the more knowledgable.

The PA Choke simply annotated as RFC1 does not seem to have a value, considering I have only got the small resistor type chokes of values between 0.56, 1, 2.2, 3.3, 4 and 4.7mH I was considering doing two values in series say a 1 and a 3.3 mH, giving 4.3 mH, the chokes are 1 watt but the resistance of them is low enough that I should be able to pass 230 mA before I hit the limit for the 3.3 mH choke. Can anyone see a problem with using these in this way?

I have done an APC for the anode connection, and I just thought that having two different value chokes may be better then one choke on it's own.

Adrian

25th Dec 2022, 7:50 pm	#92
AdrianH Octode Join Date: Mar 2020 Location: Blackburn with Darwen, Lancashire, UK. Posts: 1,572	Re: Quick question on the CODAR AT5, if anyone has one to hand. Back to the Codar AT5 circuit, another question for the more knowledgable. The PA Choke simply annotated as RFC1 does not seem to have a value, considering I have only got the small resistor type chokes of values between 0.56, 1, 2.2, 3.3, 4 and 4.7mH I was considering doing two values in series say a 1 and a 3.3 mH, giving 4.3 mH, the chokes are 1 watt but the resistance of them is low enough that I should be able to pass 230 mA before I hit the limit for the 3.3 mH choke. Can anyone see a problem with using these in this way? I have done an APC for the anode connection, and I just thought that having two different value chokes may be better then one choke on it's own. Adrian __________________ Asking questions and learning, or trying to! Youtube EF91Valve