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Question regarding CCA FM 20,000E

stephend2 said:
What is involved in the solid state IPA conversion? What matching components would be needed to present a proper 50 ohm load to the solid state amp ?
Click to expand...
Jerry Meier came up from CCA around 1990 and bypassed the 8122 from the FM20000D, but I wasn't there with him when he did. Not sure that they make a big enough Bext Box to replace the 5CX1500B...but right off hand, I don't know what kind of power the 1500 produces.

That said...I hope that Chief Engineer will chime in on this one. He has an FM2500E (I think it's an E, but it might be a later model D) that he got the CCA conversion kit for a few years ago. We put our collective heads together and installed the kit. It worked, but we couldn't (at least that day) get the reflected power down to anything close to what I'd call acceptable...I'm thinking it was 3:1 or so. It ran but not quite at full TPO. I'm curious about where that went...hopefully he'll jump in and give us both an update.
 
Bob,
I ended up cheating. We got the reflected power down but the IPA (now a 500 w - not a 300 w) is inefficient. The original sale to us was a re manufactured 3/5kw box. Probably a 1968 transmitter we bought in 2000. The whole thing had been taken apart, cleaned, repainted, new parts. Like American Restoration.

After the install of the SS amp Ving indicated the CCA can easily make 8kw. For this to happen I will need to poke around some more and maybe get you here on a good day to help find the lost efficiency. I may need up to 6 kw when we do the power upgrade.

We may not be at 500 w but close to get 2.7 kw. Refl power isn't bad. From the Pl voltage adn current we ahve less drive than required to go higher.
 
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