Home Up Published Articles VHF Power Amps Low Noise Amplifiers HF Power Amps VHF UHF Ant Software

 

HF Power Amplifiers

 

New

2xGI7B

                       

   

Built by: Ratko YU1NR

 

2xGU81M

2xGU81M.zip

           

Built by: Ratko YU1NR

 

2xGU84B

WB input circuit

 1    2 

 

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


 

new

1xGS31B

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!

 

 1    2


 

Input Parallel Grid Resistance for some popular tetrodes


 

Home Up Published Articles VHF Power Amps Low Noise Amplifiers HF Power Amps VHF UHF Ant Software