[Elecraft] N5ESE's T1 review -- excellent, but one correction

[Leigh L Klotz, Jr.]

I just finished my T1 and am trying it out on a trip now with my FT817.  
(I have my KX1 as a backup.)

I was confused by the battery clip instructions too, as the diagram for 
installing them takes some time to orient.  But I figured out that when 
installing the battery, the narrow tab goes to the battery's narrow 
post, and the wide tab goes to the battery's wide post.  I didn't see 
this in the manual, and it is kind of obvious once you figure it out, 
but noting it in the manual might be soothing.

I was also confused by "face down" for the bottom of the chassis in the 
final instalation of the board into the case.  Again, obvious once you 
start to do it, but it wasn't clear to me whether the face of the bottom 
was the closed side or the open side (whixh would be the face of the 
completed box).

Despite my tightening the screw on the GND lug with needle-nose, it was 
loose after I soldered it. I don't know if it will get loose again.  
Perhaps I have the washer in the wrong place.

Leigh / WA5ZNU

On Tue, 5 Apr 2005 8:11 pm, wayne burdick wrote:
> 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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