>
>OK guys, I started a long series of posts with my last question about
>regulating a 1KV screen supply for a 4-1000 in AB1. I've tried a lot of
>your ideas, but mostly have turned a handful of sand-state stuff into
>puddles of silicon.
>
>The screen supply itself is overkill, it's easily capable of 500W
>continuous, resonated choke input.
>
>To make a long story short, I think my supply may be stiff enough. I don't
>have access to fancy test equipment so I'm just looking for your thoughts on
>this. The supply is heavily loaded (6K ohm bleeder). When I add an
>additional 6K bleed (160ma load) I get a 50V drop (1000 -> 950). Clearly
>this is not any kind of a dynamic load. On the plus side, the variac I'm
>using for testing is a pretty wimpy job. In the final installation I'll be
>using a much huskier variac and the primary side will be stiffer running the
>transformer on 220V.
>
>I'm mostly a CW OP but I don't want to be known for a horrible SSB signal
>the few times I run this mess in AB1.
>
>So, what-cha think? is 5% regulation acceptable on the screen of a 4-1000
>in AB1?
Nope. A 5% change in Esc would produce c. 8% change in anode current.
// 20mA of screen bleeder current would be plenty. // Short-circuit
proof, RF proof regulated, solid-state screen supplies are easy to build.
A roadmap for an LM723-based pos. floating screen regulator ckt. is on
my Web site. The zero/full load reg. is so good that I can't measure the
v drop on my Fluke 3.5 digit DMM.
>
- later, Bill
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
|