I have an Astron 20M and IIRC the transformer alone is bigger than the P3 enclosure. And then there's the big finned heat sink hanging on the back (the reason it doesn't need a fan). If you can squeeze the transformer in the enclosure and find somewhere to mount the regulator circuit, the heat sink might fit on the top of the P3, giving it a sort of "Jurassic" look :-)
But there's another important issue beyond size - the magnetic field. Linear supplies are electrically quiet but very *noisy*, magnetically. The strong 60 Hz magnetic field can wreak havoc in many nearby devices and circuits. Extensive magnetic shielding is normally employed when a large transformer in near sensitive circuits - normally very heavy and bulky for larger transformers and still not completely effective. Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Andrew Moore Sent: Saturday, July 02, 2011 3:19 PM To: Phil Hystad Cc: Elecraft Subject: Re: [Elecraft] Power Supply? phil> Isn't the RS-20M a linear power supply? Correct, linear. Again I'm not sure if it can be crammed into a P3 enclosure, but come Friday, I'll know :) I too despise noisy fans. I'd pick one carefully! --Andrew, NV1B .. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
