| To: | jeremy-ca <km1h@jeremy.mv.com>, amps@contesting.com |
|---|---|
| Subject: | Re: [Amps] operating a transformer in oil |
| From: | Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk> |
| Reply-to: | g3rzp@g3rzp.wanadoo.co.uk |
| Date: | Mon, 12 Nov 2007 11:57:38 +0100 (CET) |
| List-post: | <mailto:amps@contesting.com> |
>Ive seen mention of that method Peter but how do you calculate the choke value?< I don't know, but I would work on the basis that the choke should offer 10 times the impedance of the PA at the lowest modulating frequency. So a 10Henry choke offering 18k ohms in the DC feed to the PA, and from the mod transformer via a capacitor witha reactance of about 1/10 of the PA load - say 4 mFd - should do the trick. It's a techniques some very QRO (100kW plus) broadcast tx's use. 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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