[VHFcontesting] SSPA Causing Serious Voltage Sag Under Load

[K3SK at buckwalter.co]

I use Eltec server power supplies for my SSPAs and up until now I have not
had an issue.  I recently acquired a Larcan Hi-Hi that is capable of 1500
watts output on 222 MHz.  After making the necessary changes to use the
Larcan I connected for testing to my 50V 3000 watt Eltec power supply.  On
initial key down the amplifier easily puts out 1200+ watts but the supply
voltage drops significantly as does the RF output power.    When running my
other amplifiers I do not have voltage drop and everything works fine.
I have tried this with 3 different power supplies.  My assumption is I am
reaching the current limit of the individual supplies. 

 

If each Eltec is set to the same voltage and current limiting, can I
parallel them?   If so, is it any more complicated than connecting the
outputs together? 

 

 

Dave - K3SK