RF amp 600W

[Robin Ivetic]

Hello,

I already ask on different communication channel about this amp, and issue where different then. Now amp has stable bias current per mosfet around 300mA, as it's written on PCB board 300mA or 2.7V.

Issue is that signal don't boost at all, when I try to start GNU script. I have one power supply, for drain and gate. On gate side I have voltage down converter, and can confirm that voltage converter can supply actually around 12-14V 1.5A under working condition, because I try with some cheap amp operating around12-14V, and voltage converter start acting funny around 1.5-1-6A. From manual gate side needs around 1A and 12V. 

I actually don't have proper power supply on drain side, it's some cheap Chinese Voltage/current adjustable power supply, but can provide only 4A at 53V, and manual says 15A and 53V, but JIm you will no this for sure, don't know if mosfet needs that much current when actually starts, although MRF300AN and MRF300BN are not toy gadgets.

Manufacturer didn't provide any manual/debug manual, I don't know how to connect output coaxial cable, now is only central wire connected, usually ground and plus are connected on second magnetic coil (before output SMA, like on picture).

What else can be problem why I don't have any boost signal on output SMA, think that mosfets are in good condition!!!???

 

Robin

[jcve...@gmail.com]

Important Note: This amp is not an RF Power Tools product. I do not have direct knowledge of this amp or how it works. If the company that made it doesn't offer support you are on your own. Here is what I think, I could be all wrong:

It looks like from you picture that both the center conductor and the shield of your output coax are connected to ground. I think that the shield should be where the center conductor is and the center cond should be on the pad to the left in the photo.

73,

Jim WA2EUJ