r390a ptos

[KA9EGW at AOL.COM]

(Attached is the excel 5.0 version with operands intact)

Here is the text version of the freq ranges that result when the capacitance
in an R390 pTO is changed from the original 390 pF.
Note that this chart does not take into account stray tube capacitance.

R390A calculated freq range vs capacitance
capacity pF     low end high end
27              9320499 13120573
33              8430709 11868005
39              7755124 10916977
47              7064349 9944564
56              6471829 9110468
68              5873089 8267615
82              5348280 7528835
91              5076921 7146839
100             4843074 6817650
120             4421101 6223634
150             3954353 5566588
180             3609814 5081576
200             3424570 4820806
220             3265200 4596459
240             3126191 4400774
270             2947401 4149090
300             2796150 3936172
330             2666024 3752993
360             2552524 3593217
390             2452386 3452251
400             2421537 3408825
500             2165888 3048946
600             1977176 2783294
700             1830510 2576829
800             1712285 2410403
900             1614358 2272550
1000            1531514 2155930
1063            1485438 2091068
1200            1398075 1968086
1500            1250476 1760310
1800            1141523 1606935
2000            1082944 1524473
2200            1032547 1453528
2400            988588.2        1391647
2700            932049.9        1312057
3000            884220.2        1244727
3300            843070.9        1186800
3900            775512.4        1091698
4700            706434.9        994456.4
5600            647182.9        911046.8
6800            587308.9        826761.5
8200            534828        752883.5
9100            507692.1        714683.9
10000           484307.4        681765
11000           461768.9        650037.4
12000           442110.1        622363.4

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