Finding suitable modulation transfomers is hard. Finding suitable chokes is harder, specially those as large as the 158 pound 50H monster in my RCA BTA1R1. Unlike 2 meter handhelds, you won't find many modulation chokes or transformers the size you need at hamfests or even on EBAY. That's why I moved quickly when I found a complete set of spare iron for my RCA BTA1R1. The RCA cost $500. The spare iron cost more. Was it worth it? No doubt.
If you must build your own, I think the best economic deal is to buy a broadcast transmitter and rob it of its parts but doing so seems such a waste. Why destroy something that is so well engineered only to replace it with something that probably won't be? Brian WA5UEK Philips Semiconductors 2140 Lake Park Boulevard, Suite 200 Richardson, Texas 75080 USA Mobile: 214-763-5977 (preferred) Office: 972 705-2484 Fax: 972-705-2450 Email: [EMAIL PROTECTED] Larry Keith <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] 2006-03-28 11:19 AM Please respond to Discussion of AM Radio <[email protected]> To Discussion of AM Radio <[email protected]> cc Subject [AMRadio] HB Xmtr, was: Home Brew AM Transmitter Wanted Classification I have been looking at HB AM Xmtr designs. One of the more interesting ones can be found on the amwindow.org web site. It is a pair of 813's modulated by a pair of 813's. That makes it interesting to me since I already have a stash of 813's! The designs doesn't look too complex. It requires about 5 - 10 watts of RF drive and 20 watts of audio. Those should be easy enough. >From looking at the xmtr and power supplies schematics, it appears that the only "scare" parts are the modulation transformer and the Heising choke. Would anyone care to comment of availiability of such items? Specs shown are: Mod Xfmr -- 300 - 500 Watts, 2:1 step down. Heising choke: 50 H @ .5 A 73, Larry KQ4BY Larry Keith 231 Shenandoah Trail Warner Robins, GA 31088-6289 [EMAIL PROTECTED] 478-329-0030 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
