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Re: 3 phase (was LF: G3KEV)

To: <[email protected]>
Subject: Re: 3 phase (was LF: G3KEV)
From: "mal hamilton" <[email protected]>
Date: Sat, 28 Nov 2015 18:20:29 -0000
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Andy es Co
6 phase even better lower ripple.
A car alternator is 3 phase, could easily be 6
g3kev
 
 
 
Sent: Saturday, November 28, 2015 4:26 PM
Subject: Re: 3 phase (was LF: G3KEV)
 
What's wrong with that ?
Sounds an excellent idea for a QRO transmitter.   300Hz ripple - much easier to filter out.
 
My 137kHz Tx runs from rectified (single phase) mains - the isolation is provided in the ferrite output transformer and FET drive pot-core
 
A school we once went around with long leads and an AVO  identifying sockets to be found on all three of the phases.  That was so that, using extension leads, we could bring them all into the lab to get a three phase motor running.   Such interesting things could be done in schools in the 1970's
 
Andy G4JNT
 
 
On 28 November 2015 at 15:52, John Rabson <[email protected]> wrote:

In the early days of 73 kHz I believe a Luxembourg station built a transmitter which was powered off full-wave rectified three-phase mains without an isolating transformer. NOT the best way of doing things!

John F5VLF
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