I don't quite calculate the same number.
If the source is 3 phase power and halfwave rectification the ripple
would be 50%. This is most likely _not_ the case. In the more likely
case of full wave rectification and 3 phase power the ripple would be
13.4%. In the halfwave case there is always one phase within +/-60
degrees of the max. (1 - sin(30 deg.) = 0.5) and in the fullwave case
there is always one phase within +/-30 degrees of the max. (1 - sin(60
deg.) = .866). This of course is the ideal case and additional voltage
drops in the transformer, wiring, etc. would increase the ripple.
On 4/19/2012 3:47 PM, Dan Mills wrote:
> On Wed, 2012-04-18 at 18:15 -0500, email@example.com wrote:
>> Thinking out loud.....
>> A 15KV @ 10 mf in a Broadcast FM transmitter many years ago
>> No noticable hum on carrier ( yes, I know .... FM )
>> AM noise above FCC specs ?? Probably, but they were back on the air.
> If the rig was big enough to operate on three phase power then there
> would only have been about 30% ripple even without a cap in there, so I
> am not at all surprised that an FM TX would work without a cap.
> 73s, Dan.
> Amps mailing list
Amps mailing list