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We are always happy to assist you. Related Documents Share Transcript 1. I spent two days answering CQs and calling CQ. Unfortunately no one heard me. I came to the incorrect conclusion that QRP is a hobby for guys with expensive, huge beam antennas, not guys with verticals and dipoles.
The other way to get 10 dB of gain is an amplifier. Transmitting more than 5 watts is called QRO. In this chapter I shall describe my efforts to build a good linear amplifier.
Having QRO power when I need it has made my transmitter a reliable communications system. With 50 or more watts, your contacts won't have to work so hard to hear you and rag-chewing becomes practical. In the old days our receivers had passbands several KHz wide and most beginners were stuck with a couple crystals for each band.
After we called CQ, we tuned up and down the entire band looking for replies.
In contrast, today guys with modern receivers are usually just listening to a few hundred Hz. On 15 meters the other stations were tuned to the upper sideband while I was often zeroed in on the lower sideband. When I answered those CQs, I was usually off their frequencies by about 1.
In this chapter I describe three different final amplifier designs that I used successfully on the air. I describe it here because it was educational.
It worked, I learned from it, and it covers 20 through 10 meters. Unfortunately, it was too hard to tune. Moreover, you would probably have a hard time finding a dual-section, butterfly variable capacitor like the one I used to tune the output to resonance.
It works on all bands and is suitable for CW only.
Someday when you graduate to single sideband phone you can upgrade this amplifier to the third design, which is an all band Class AB linear amplifier. Rather than just read the descriptions of the finished products, you may gain some insights by reading my odyssey of how I worked my way up to a real linear amplifier.
I found three examples of linear amplifiers. Chapter 12, Harris than something I was encouraged to build.
It used a pair of MRF transistors. I looked them up in my RF Parts Company catalog.
I also worried about all those feedback loops and clamps that protected the transistors from overdrivefrom excess SWRfrom excess collector voltage, and from thermal runaway.
In addition, there were at least three kinds of frequency compensation feedback. My only comparable previous projects had been and watt switching power supplies.
I was extremely wary of this project.timberdesignmag.com update chap metric learning Feb 1, timberdesignmag.comxt update chap metric learning Feb 1, timberdesignmag.comxt update chap metric learning Feb 1, timberdesignmag.comxt update chap metric learning Feb 1, visualize_result.
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