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Title: DX 60 L1 / 40M Post by: wa2tak on June 23, 2023, 02:34:46 PM Hope no one is bothered by me taking up so much 'bandwidth' on this forum.
What the heck is the purpose of L1 / 40 meters? I see only scant mention "check" and "peak" watching driver bias... 1. how is it FIRST set? 2. what 'peak' to look for and what settings to do this? 3. where / how to look? Title: Re: DX 60 L1 / 40M Post by: DMOD on June 23, 2023, 11:45:19 PM Hope no one is bothered by me taking up so much 'bandwidth' on this forum. What the heck is the purpose of L1 / 40 meters? I see only scant mention "check" and "peak" watching driver bias... 1. how is it FIRST set? 2. what 'peak' to look for and what settings to do this? 3. where / how to look? L1's inductance parallel resonates with tube and parasitic capacitances for enhanced signal levels from 40m and up. Set BSW for 40 meters. Measure voltage across R6. Use a 7.295 Mhz crystal or VFO. Key transmitter and adjust 40 meter coil screw for max neg. voltage (bias) across R6. Phil - AC0OB |