----- Original Message ----- From: [EMAIL PROTECTED] To: collins group Sent: Thursday, November 25, 2004 9:51 AM Subject: modulation transformer
Hello AM friends, I recently acquired a nice modulation transformer which has an apparent Collins part number and I'm wondering if anyone knows what transmitter might have used it and perhaps what the tube lineup was. Also would like to get info on the ratings. It is Part# 677-0308-00. Dated Feb. 8, 1950. Manufactured by Chicago Transformer Div. Essex Wire Corp. in Chicago, IL. It is apparently a 300-400 watt unit with primary of 0-1500-3000 ohms and sec of 0-9500,10,800,12,300,14000,15,800, and 18,000 ohms. It is in the typical metal can with 10 ceramic terms on top and weighs 25 lbs. Dimensions approx 5" x 6" x 7". Seems like quite low primary impedance. Perhaps used high current, low voltage....maybe push pull parallel modulator tubes?? I would just like to find out more about it, and see if I can put it to good use. By the way, the mod xfmr in my Collins 30K-4 is Part# 677-0316-00 and is a 200 watt unit made by the same manufacturer and same vintage. I'm still looking for a replacement, as mine has a shorted winding in it. Thank you very much for any info you might be able to provide. 73, Jack, W9GT From [EMAIL PROTECTED] Sat Nov 27 18:13:09 2004 Return-Path: <[EMAIL PROTECTED]> X-Original-To: [email protected] Delivered-To: [email protected] Received: from smtp808.mail.sc5.yahoo.com (smtp808.mail.sc5.yahoo.com [66.163.168.187]) by mailman.qth.net (Postfix) with SMTP id BF426859C01 for <[email protected]>; Sat, 27 Nov 2004 18:13:04 -0500 (EST) Received: from unknown (HELO VALUED976296A0) ([EMAIL PROTECTED]@68.92.198.71 with login) by smtp808.mail.sc5.yahoo.com with SMTP; 27 Nov 2004 23:06:10 -0000 Message-ID: <[EMAIL PROTECTED]> From: "Keith Anderson" <[EMAIL PROTECTED]> To: "SW Programs" <[EMAIL PROTECTED]>, "AM Ham Radio" <[email protected]> Date: Sat, 27 Nov 2004 17:06:05 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 Cc: Subject: [AMRadio] BPL in Texas - from Houston Chronicle.com X-BeenThere: [email protected] X-Mailman-Version: 2.1.4 Precedence: list Reply-To: Discussion of AM Radio <[email protected]> List-Id: Discussion of AM Radio <amradio.mailman.qth.net> List-Unsubscribe: <http://mailman.qth.net/mailman/listinfo/amradio>, <mailto:[EMAIL PROTECTED]> List-Archive: <http://mailman.qth.net/mailman/private/amradio> List-Post: <mailto:[email protected]> List-Help: <mailto:[EMAIL PROTECTED]> List-Subscribe: <http://mailman.qth.net/mailman/listinfo/amradio>, <mailto:[EMAIL PROTECTED]> X-List-Received-Date: Sat, 27 Nov 2004 23:13:09 -0000 BPL comes to Texas, Burnet is a small town located northwest of Austin, Texas' state capital. http://www.chron.com/cs/CDA/ssistory.mpl/business/2919786 Nov. 26, 2004, 4:59PM Texas town gets Net over power lines > ------------------------------------ > > Associated Press > > BURNET -- High-speed Internet service is coming to about 120 homes in > this town of 5,000 using a novel technology that connects residents to > the Web through power lines. > > Broadband Horizons, which provides Internet access to about 6,000 > customers in rural parts of Central Texas, is paying most of the > estimated $50,000 cost to install a network in a neighborhood of > Burnet, about 40 miles northwest of Austin. > > Once the system is in place, scheduled by year end, they say that > houses will connect by plugging a simple modem device into a wall > socket. > > Companies have been trying to develop the technology -- called > broadband over power line, or BPL -- for nearly a decade, and now the > technology is being tested in a few places. The city-owned electric > utility in Manassas, Va., launched a pilot project last fall. > Ohio-based Cinergy Corp. is also testing a system. > > In theory, electric current runs along power lines at low frequencies > and doesn't interfere with Internet signals at much higher frequencies. > Advocates say the technology would be a cheaper way to wire rural towns > like Burnet. > > Bob McClung, a Blanco entrepreneur, believes he could provide broadband > service for about $30 a month with the cooperation of public and > private electric utilities. He told the Austin American-Statesman that > the technology could be much more common within a few years. > > Some analysts are skeptical, however, noting that cable television > operators and phone companies have a big head start in building > broadband networks. > > "There are 31 million subscribers to broadband in the U.S.," Bruce > Leichtman of Leichtman Research Group in Durham, N.H., told the Austin > American-Statesman. "We are well beyond the early-adopter stage. The > high-end of the market is pretty well plucked." > > Ken Graham, the mayor pro tem, who retired to Burnet in 1999 after > working in telecommunications, said he doesn't like his slow dial-up > connection to the Internet and views the broadband pilot as a good > thing. > > "This will enhance our quality of life, very definitely," Graham said. > "Most people that live in this subdivision are retired professionals. > They have moved to the small town, but they don't want to give up the > conveniences that they had." > > > Brought to you by the HoustonChronicle.com >
