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Some Thoughts on Regenerative Receivers

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ANTENTOP- 01- 2010, # 012

Some Thoughts on Regenerative Receivers

 

Page of Armstrong’s Patent of the Tickler Oscillator

 

Note I.G.: On the base of the Regenerative Receiver Armstrong patented several so called “Tickler Oscillator.”

Figure Credit Line: Wiki

 

Everybody is likely familiar with the original Armstrong design -- tickler coil for feedback, "throttle" with a variable capacitor RF bypass from plate to ground, etc., etc., etc. Keep that in mind, as this discussion progresses. If you aren't familiar with the basic design -- grid lead detector, "tickler" feedback and regeneration control with a variable capacitor, look this up. Actually, Armstrong's original circuit was slightly more complicated, but the scheme I've mentioned covers the basic design.

 

One needs to keep firm in mind that early receivers, as well as transmitter designs were governed strongly by cost and complexity considerations.

 

Early vacuum tubes were expensive, and parts generally difficult to come by, and expensive as well. Also, simplicity was a major consideration, as the more complex something is, the lest reliable it will tend to be.

As a consequence, there were some design compromises that we've been working to overcome over the years.

 

The following discussion applies to vacuum tube designs as well as their modern cousins with bipolar and field effect devices. They really differ only in the details. Every person has their "pet" designs, of course, as do I. Well, here goes...

 

Classic  Colpitts regenerative receiver may be found: http://www.antentop/012/regen_rx_012.htm

 

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August 2, 2016 18:16

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