The 3 x section choke,? currently sold by ameritron,? is now screwed up.? Ameritron ran outa 28 ga wire...and started using 27 ga wire.? ?The pair of gaps is way less.? Steve at RF parts got a ton of the screwed up ones....and sent me one to test on my vna.? ?The screwed up version series resonates on 20m and 17m.? Scott got one of the screwed up versions and tossed it.?
The ONLY version of that choke that is wound correctly is sold by W8JI? at CTR engineering.?
I got 2 from RF parts years ago....and tested both of em on the VNA.? ?They resonate at aprx 12.5 mhz...and also 16.5 mhz.? Normal.
Interestingly enough, the 154 uh plate choke in all 4 of my L4B's? ?resonates at 12.5 mhz...and 16.5 mhz.? ? The drake choke is just one winding.?
Now how a good ameritron choke resonates on 30m band, on older alpha's is beyond me.? Close proximity to metal, and / or dielectrics will? shift the resonant freqs down.
The ameritron choke is 6" tall....and is too tall for the L4B.? Barely any clearance between top screw on choke...and top lid.?
