Home Up Lazy Builders PA 70 cm 2 m + 6m 2 m 6 m 23 cm Exper. Builders PA

Power amplifiers for "lazy builders"

 

New!

Simple HF design philosophy on VHF bands!

You hate complicated machine work? Strip lines and other specifically VHF/UHF "stupidities" drive you crazy? You don't have PTFE sheet? You want to build VHF/UHF power amplifier but you are too lazy to deal with complicated mechanical works? You don't like to read text given in article together with schematic and layout diagrams? You are very good and experienced PA builder, although others don't think so? If amplifier works, credit goes to you, if don't, blame goes to others? You don't want to waste your talents on ordinary PA designs? If it is so, you are on the right place, and these designs are "your cup of tea"!

 

Important notes:

All connections between RF parts, and also connections to ground MUST BE as short as possible! This is VHF, not HF, in spite that designs may looks like HF! Hi! See mechanical layout of PA designs below!

If input circuit trimmers, need to be at maximum or minimum capacity during adjusting, it is necessary to change the length of the cable between the exciter and the amplifier itself. The optimal length of the cable should be determined experimentally to obtain adjustment with approximately the calculated values of capacitances. This experimentally determined cable should always be used when operating the amplifier. A change of exciter could occasionally require a new length of cable to be determined.

 

New! Not yet published in magazines

 

50+70 MHz

1xGI7B or 1xGI46B 6m+4m Lazy Builders Duobander PA       New!

6m                   

4m                   

 

1xGS35B 6m+4m Lazy Builders Duobander PA       New!

   

6 m                    

4 m                    

 


 

 

144 MHz

 

1xGI46B 2m Lazy Builders PA      Data         New

                   

Built by Uge, EA7HG           

 

2xGI46B 2m Lazy Builders PA      Data         New

                   

 

1xGI7B 2m Lazy Builders PA             1    2    3

                       

Built by Ratko, YU1NR

       

Built by Tony, CT1FUU

                   

Built by: Ljubiša, E73LM

                                   

Built by: Zoran, YT5VA

 

2xGI7B 2m Lazy Builders PA             1    2    3

       

           

Built by Saša, YU1EO

 

   

Built by Glenn VK4BG

                       

Built by Ljubiša, E73LM

                                       

Built by Zoran, YT5VA

 

1xGS31B 2m Lazy Builders PA         1    2    3    4    5    6    7

               

Built by Carey, KC5GTT

                   

Built by Ljubiša, E73LM

 

 

2xGS31B 2m Lazy Builders PA         1    2    3

 

1xGS35B 2m Lazy Builders PA     New

                   

                                               

PA Buiding: gs35b ok1gth.PDF        PA Measurements: mereni2.pdf

Built and measured by Tomáš, OK1GTH

               

Built by Ljubiša, E73LM

 

2xGS35B 2m Lazy Builders PA     New

                   

 

                       

Built by Leif, OZ6ABA

 

1x8877 2m Lazy Builders PA            1    2 

1x4CX1500A 2m Lazy Builders PA    1    2   3   New    

Built by Vlatko, 9A9R      

 

1x4CX1500B 2m Lazy Builders PA    1

               

Built by Željko, 9A3RU

           

Built by Fica, YU7AA

 

1xGU34B 2m Lazy Builders PA       New

         

Built by Fica, YU7AA

 

1xGU78B 2m Lazy Builders PA           New

1xGU84B 2m Lazy Builders PA                New

 


50 MHz

 

1x4CX1500B 6m Lazy Builders PA   1    2   3   New    

                                   

Built by: Vlatko, 9A9R

 


70 MHz

New

1xGS31B 2m Lazy Builders PA

                   

 

               

Built by Rhys, GW4RWR


Home Up Lazy Builders PA 70 cm 2 m + 6m 2 m 6 m 23 cm Exper. Builders PA