[AMRadio] coupling cap on the moduation transformer secondary


John Lyles jtml at losalamos.com
Tue Aug 16 15:21:46 EDT 2005


I was just about to say this, Don already responded to it. Besides, finding a compact oil filled capacitor of 2-3 kVDC rating is much simpler if you use a few uF. You don't need 10 Hz low end response, thats wasted power since most receiver/speakers won't reproduce that. Also, the capacitor is just another source of stored energy in your radio, to deal with from a safety standpoint. More is not always better. 


> Message: 3
> Date: Tue, 16 Aug 2005 03:00:55 +0000
> From: "Donald Chester" <k4kyv at hotmail.com>
> Subject: Re: [AMRadio] AMPX article on mod reactor
> To: amradio at mailman.qth.net

> Actually, broadcast transmitters use much less than than, and still boast of 
> flat response down to 30~ or lower.  RCA transmitters typically use 1 mfd.  
> Gates uses 2 mfd.  I use 4 mfd in my homebrew rig @ 4000 ohms modulating 
> impedance.
> 
> 73, Don k4kyv
> 
>



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