New
Built by: Ratko YU1NR
Built by: Ratko YU1NR
WB input circuit
Plate PI filter circuit
Ua=2200V, Ug2=375V, Ia=2x2A,
| BAND (MHz) | C1 (pF) | C2 (pF) | La (nH) | coil inner diam. (m) | coil len. (mm) | turns (number) | wire dia. (mm) |
| 28 | 88 | 336 | 360 | 50 | 50 | 3.3 | 7-9 |
| 21 | 127 | 450 | 483 | 50 | 60 | 4 | 7-9 |
| 14 | 197 | 670 | 717 | 50 | 80 | 5.5 | 7-9 |
| 7 | 425 | 1325 | 1444 | 50 | 100 | 8.5 | 6-7 |
| 3.5 | 837 | 2600 | 2772 | 50 | 160 | 14.3 | 5-7 |
| 1.8 | 1725 | 5275 | 5635 | 50 | 250 | 25 | 5-6 |
built by: Ratko YU1NR
Calculated with new developed
YU1AW
Dynamic Tube Model
Bands: 1.8 - 3.5 - 7 - 10 - 14 - 18 - 21 - 24 - 28 MHz
Sch.Diagr. PI data Note!
160m Gain Volt Curr Power SWR Padis Effic
20m Gain Volt Curr Power SWR Padis Effic
10m Gain Volt Curr Power SWR Padis Effic
Built by Giuseppe, IW4DQY
Universal input matching circuit for grid driven HF amplifiers
(modification of Tom DL7AV design)
Universal WB input matching circuit for grid driven HF amplifiers with overall input capacitances Cin= 1pF - 500pF. For Cin=100pF-200pF this circuit can be used up to 50 MHz!
Input Parallel Grid Resistance for some popular tetrodes
