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Title: "PW" 6 watts a.m. transmitter circuit. Post by: Esoteric Radio on April 28, 2005, 04:04:05 PM If interested in homebrewing something
easy to build; I have gotten out 250 miles, at night, on 3938 KHZ with my latest PW/QRP xmtr circuit. here at: http://www.angelfire.com/de/RadioAnarchy/ I was using a D104 mic, straight into the TDA2003 modulator, but had R7 as 470K, and had three 10 ohm resistors paralleled for R4 to get more audio, which was clipping. I even plugged in my electric guitar for a test. 8) Title: Kewl Post by: N9NEO on May 01, 2005, 09:20:20 AM Nice Job.
What is the TDA2003 IC chip you used? 73 NEO Title: "PW" 6 watts a.m. transmitter circuit. Post by: Jack-KA3ZLR- on May 01, 2005, 09:32:12 AM I Like it, I'd like to see the VFO circuit used there.
Title: "PW" 6 watts a.m. transmitter circuit. Post by: W1RKW on May 01, 2005, 09:43:00 AM Spec sheet on the TDA2003
http://www.st.com/stonline/books/pdf/docs/1449.pdf Title: info Post by: Esoteric Radio on May 01, 2005, 03:30:20 PM "What is the TDA2003 IC chip you used?" AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
you can use a TDA2002 or TDA2003 or the http://www.nteinc.com/ equivalents. NTE1288 or NTE1232 It was a common car audio amplifier IC. "I Like it, I'd like to see the VFO circuit used there." this xmtr is cystal controlled, but I also had my VFO driving it. the basic schematic is at the bottom of the webpage. I added a voltage regulator. But I came up with another VFO design I'll post, after I re-build it. This VFO will hopefully be able to drive a old tube xmtr. |