The RCA 1:1 modulation XFMR I believe is good for only 200 ma in its secondary. Don, K4KYV has described a method of removing or reducing the core gap to make this XFMR capable of very good low frequency response but it will then require a modulation reactor and coupling capacitor because the secondary current handling before core saturation will decrease drastically. The STOCK XFMR will provide fairly good audio down to 200 or 300 CPS depending on the load and secondary current. My understanding from Don was that the primary use of the XFMR was for a tone modulated CW rig or MCW as I think it was called. If this is the case then all it had to pass was a single CW audio tone. I have used the STOCK XFMR in the past with pretty good results, and certainly good audio especially in the communication range but don't expect it to do HIFI from 50cps to 10,000cps and it would be best to use a reactor with it even if you don't modify the core gap.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark Foltarz Sent: Wednesday, September 20, 2006 5:53 PM To: [email protected] Subject: [AMRadio] Seeking advice on testing modulation transformers By the way, does anyone have any experience using the RCA 5500 5500 units? TNX de KA4JVY Mark __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
