12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 19
The RF deck is finally completed !!
Bias diodes installed.....and also the hb ferrite loaded plate choke. (393
uh, and series resonates at 17.650 hz....and also 30.1 mhz).
A pair of .01uf @ 30 kv disc caps installed at cold end of plate
choke...along with a 750 pf @ 15 kv doorknob cap assy. (2 x 1500 pf @ 7.5
kv doorknobs in series). This is a thing of beauty, but was one helluva lot
of work + effort. 160-80-40-20-15m....that's it.
Output side has all been mapped out. No padding used on either vac tune or
load caps. On the input side, air caps are padded on 160m only. Vac relays
used for the input + bias, and also 2 x more in parallel for the 12 kw
output. Everything is rated for 100% duty cycle, brick on key CXR.
Next up is the hb 7500 vdc B+ supply....which gets installed at bottom of
the same rack...along with the fil xfmr and Ebm-Papst 330 cfm blower etc.
20 x 2500uf @ 450 vdc lytics will be used in series. (125 uf @ 9
kv)...along with a pair of 7.5 kva CCS identical plate xfmrs, etc.
On a side note, I made up several of those ferrite loaded chokes. On my own
choke, I made it a bit longer, and it series resonates @ 16.2 mhz.....and
also 27.99 mhz. The 16.2 mhz is midpoint between 20+17m. On Scott's amp,
due to height restraints, I had to make the choke shorter..... and his 1st
series resonance @ 17.650 mhz is midpoint between 20m + 15m.
Once the B+ and fil supply are built + installed, final testing and
calibration can be done.
https://www.youtube.com/watch?v=9ZUrb3vqfSc
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|