03-07-2023, 05:21 AM
Hi Chas,
By SW-3 are you describing the National SW3? Are you describing L1? Yes, I expect that one to have a high inductance, as it is iron core and blocks high frequencies from the B+ supply, and, yeah, it being a regenerative detector, it is a good idea to have a 700H (??) choke there. The ones in series with the detector plate and the coupling cap (L2 and L3) are 2.5mH and 5.5mH air core units.
My recommendation to sub resistors for the chokes were merely to move forward with testing the radio. If it works but unsatisfactory performance can be traced to the absence of L11 and L12, then the effort in duplicating them can be spent.
Best Regards,
John
By SW-3 are you describing the National SW3? Are you describing L1? Yes, I expect that one to have a high inductance, as it is iron core and blocks high frequencies from the B+ supply, and, yeah, it being a regenerative detector, it is a good idea to have a 700H (??) choke there. The ones in series with the detector plate and the coupling cap (L2 and L3) are 2.5mH and 5.5mH air core units.
My recommendation to sub resistors for the chokes were merely to move forward with testing the radio. If it works but unsatisfactory performance can be traced to the absence of L11 and L12, then the effort in duplicating them can be spent.
Best Regards,
John
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
