Jim Hanlon, W8KGI Do you have the relay specs for a Western Electric 303J? It is an octal and may have the coil on pins 7 and 8; I measure about 100 ohms across them. It is sealed with a High Pressure warning on the metal case which is about 2 inches high. Thank you, Jack, WA1BRI
--- On Wed, 12/16/09, [email protected] <[email protected]> wrote: From: [email protected] <[email protected]> Subject: AMRadio Digest, Vol 71, Issue 23 To: [email protected] Date: Wednesday, December 16, 2009, 12:00 PM Send AMRadio mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://mailman.qth.net/mailman/listinfo/amradio or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of AMRadio digest..." Today's Topics: 1. Re: Relay Rating (JAMES HANLON) ---------------------------------------------------------------------- Message: 1 Date: Tue, 15 Dec 2009 10:54:29 -0700 From: "JAMES HANLON" <[email protected]> Subject: Re: [AMRadio] Relay Rating To: "John King" <[email protected]> Cc: AMradio <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" John, I can't beat Bernie's reply from experience, but I will add that 300 watts of carrier would produce 2.45 amps of current into a 50 ohm load and 2.04 amps into a 72 ohm load, so you won't be anywhere near "overloading" the 10 amp rated contacts. Personally I use a mercury-wetted relay to switch my tuned-to-50-ohm antenna load between my transmitter and receiver. The transmitter can deliver as much as 600 watts CW from my SB-200, which corresponds to 3.46 amps into 50 ohms. My relay is a Western Electric 276 rated for 5 amps "DC." I do not hot switch it, at least intentionally, since I have a timed QSK system. It holds up just fine in this service. Jim Hanlon, W8KGI ------------------------------ ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] End of AMRadio Digest, Vol 71, Issue 23 *************************************** ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
