Finally got it all figured out.? It's a bit of a complicated mess.? There is a total of 5 different? 'Q's'? involved on the GM3SEK? PI-L spreadsheet.?
? The short of it is.... I had to maladjust the 'total network Q' (line 39) to '7.74' ......so that the 'PI network Q'? (line 82, called? 'Q0PI' ) = 6.0? ? The 'PI network Q'? ? is what Peters is using to enter his Q of 6.? This is the PI-net portion of the PI-L.?
On the GM3SEK sheet, only line 38 can be changed.? It spits out everything else.?
INPUT Q? ? =? 4.4? ( Line 83)? ( called Q1)
OUTPUT Q = 1.6? ( line 89) ( Called Q2)
Input Q + Output Q =? PI network Q.? (4.4 + 1.6 = 6.0)? ?( PI network Q on Line 82)
The L NETWORK? Q? = 1.7? ?(line 75) ( called QL)
OVERALL NETWORK Q? ( called? Q0) =? ?PI network Q + L network Q ( 6.0 + 1.7 = 7.7)?
I also used Peters 200 ohm image Z, and 1100 ohm plate load Z.? ?Then the main coil? comes out to peter's 29.0 uh.? ? I did have to maladjust the plate choke to 141.5 uh? to get the main C1 tune cap = to peter's? 350 pf.? ( the plate choke value has a big impact on the C1 cap...as the 2 are in parallel electrically.?
Software spits out 1487.2 pf for the C2 cap.? ( close to peters 1500 pf)
Software spits out 7.66 uh? ( close to peters 7.65 uh)?
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Short of it is I'm entering...? 'overall network Q'... ..while peter is entering .... ' the PI net Q'?
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BTW, coil current in the main coil is? INPUT Q x dc plate current.... and not PI net Q? x DC plate current.? ? (I verified this via actual measurement).? 4.4 x 2.75 dc amps? = 12.1 RF amps in the main coil.? ? ?Same deal with the simple PI network ( INPUT Q x DC plate current = coil current.)
So it's semantic at best.?
BUT, you still can't use a low Q on 40-10m.?
On 40m, min OVERALL NETWORK? Q that can be used with a PI-L? is? 8 ...........? ?(This is all based on having the MIN C1 being at least 14 pf).?
On 30m, min Q is? 10
On 20m, min Q is? 12
On 17m, min Q is? 12
On 15m, min Q is? 12
On 12m, min Q is? 9
On 10m, min Q is? 16
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The lower Q concept works on 160+80m...... but not 40-10m.? The Tube C is just too great.?
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