[AMPS] Plate transformer, chimneys

[Rich Measures]

>
>>.....  For intermittent service such as SSB/CW the
>>doubler can actually be more efficient since it uses a larger guage
>>secondary wire; 
>
>?  good point.  .  .  IOW more copper and less paper.  
>
>But isn't the transformer utilisation factor worse with the doubler, leading
>to higher peak currents, and so more loss? OK, so resistance is less, but
>loss is I squared R. This makes the choice more difficult. 

€  So it would seem.  .  However, the decrease in R with half as many 
turns required is better than what one might expect since fewer layers of 
paper lets one use a bit larger gauge of wire than would at first seem 
possible.  Thus, utilisation increases with a doubler design.  //  
Another advantage of the FWD is ripple semi-cancellation -- i.e., as one 
capacitor bank is discharging, the other is charging.  

> think I'd go
>for the bridge because of this...but I prefer the tuned choke input with the
>bridge to reduce strain on the tranformer and rectifiers.
>
€  And especially for RTTY and AM broadcasting duty.  //  With a tuned 
choke filter, FWB is the only reasonable choice.  
>
-  cheers, Peter


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm