Re: Saturn 5
From: Rick DeNatale (denatale_at_ctc.net)
Date: 07/30/04
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Date: Fri, 30 Jul 2004 11:56:17 -0400
On Thu, 29 Jul 2004 21:58:12 +0000, rk wrote:
> Louis Scheffer wrote:
>> This has been done for a long time. I attended a talk in 1974(?) that
>> talked about why 2.4 KHz square wave was used for spacecraft power
>> distributution. Basically AC is good so instruments can use transformers
>> to get the voltages they need, high frequency is good since it minimizes
>> the weight and size of the transformers, (and filter capacitors) and
>> square waves are good since they are easy to generate with high
>> efficiency. But if you go too high in frequency various inefficiencies
>> set in, and 2.4 KHz was the compromise.
> ***
>
> If I remember correctly, then it also has the benefit of having all of the
> circuitry running at the same frequency, which can be notched out in certain
> instruments.
But if you wanted to take advantage of that, I'd think that you wouldn't
want a square wave with the attendant harmonics. You'd need a low-pass
rather than a notch filter.
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