[Amps] KK5DR's ferrite loaded plate chokes.

[Jim Thomson]

I Checked a bunch of really old  e-mail, and notes.   The folk's  who duplicated the KK5DR plate choke, using  1/2"  type 43 rod, stuffed into the inside of a  hollowed out 1" OD  Teflon rod
had nothing but grief.   All the  rods overheated !   In some cases, the rod actually launched itself  out the top ! 

Either  1" type  43 rod is required,  [like several  type  43,   1" Od beads slid over the 1/2"  rod]....   or several  type 43 rods bundled  together. 

Perhaps  type 43  material is the wrong stuff to be using  for a plate choke...esp considering the  typ plate load Z's involved ?? 

Type  43....  1"  OD bead's,  slid over  393 Teflon coax makes for excellent Choke baluns.    The  1/2"  x 8"  long  type 43 rods  work great  for   Bifilar's.  But in both those cases,
the Z is only  25-50 ohms.   

What would be an excellent solution,  would be a higher current version of the  RF parts /Ameritron plate choke.  I have asked a few times  what ga  wire is used in the Ameritron choke,
and can't get a straight answer.   I believe it's around 28 ga.       A version made with 22 ga wire  would be  the ultimate solution.   I know how Tom designed the Ameritron choke. 
However, I'm not prepared to  sit there in the shop for months,  with a vna, etc,  trying to  park  resonances.    The  2 x choke + relay version was a  cheap way to get around the problem.
Incidentally, the choke relay coil  was activated by a 3rd wafer on the tuned input switch. 

Later.... Jim   VE7RF