>
>Hello all
>
>I'm constructing a new HF amp. which has 2 roller-coaster coils
>and 2 vacuum variables in a Pi-L configuration - in other words
>4 things to adjust every time I change band !
>I could have used a band-switch and tapped coils, but
>happened to have these (heavy-duty) variable components available,
>with turns-counting dials on each.
>
>I've suddenly realised that I won't know how to tune this new amp. up,
>once it's completed.
>
Make a graph of C1 vs. turns counter indication. Calculate the number of
turns for a Q of 10 or so on each band and mark. Calculate the inductance
required for each band. Measure L1 vs. turns counter reading. Measure
L2 vs. turns counter reading. Make a tuning chart for each band. Record
C-load settings. // my Web site has some info and explaining on
what's needed.
>Help !
>
cheers, Chris
- Rich..., 805.386.3734, www.vcnet.com/measures.
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