Monty,
Thanks for comprehensive review of our T1 ATU
(http://www.dit-dididit-dit.com/t1_atu.htm). I'm glad it worked well
for you in field tests. We may make a few assembly and owner's manual
tweaks based on your feedback. (We could have used you as a field
tester :)
One important comment: There is definitely no need to use stacked cores
for both transformers in the SWR bridge. Balance is excellent even with
a stacked core at transformer T2 only, because the characteristics of
the bridge are set strictly by the turns ratio, which is the same on
both transformers (8:1). There is also no need for a stacked core at
transformer T1 for power dissipation reasons, since only T2 sees the
effect of the voltage step-up and corresponding core heating. We have
fully tested the unit at its maximum rated power with just the one
stacked core.
We did send out an incorrect version of the errata sheet to a few
builders that claimed 7 turns were required on T2. Hopefully you got
the word to use 8!
73,
Wayne
N6KR
---
http://www.elecraft.com
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