2. I have been experimenting with a very simple AM regenerative receiver discussed at circuitbasics.com. The schematic is shown here: I obtain fairly good performance feeding the output to an old Radio Shack amplified speaker. I'd like to build an audio amplifier based on an LM386 op amp as part of the circuit, such as is shown in the same ...
A General Coverage Regen Receiver with Plug-In Coils
The 15855 - 17850khZ coil stops about 50KHz short of the top of the 16M band, which is nominally 17480 - 17900KHz. However, all these coverage figures are quoted with the fine tuning control set to maximum capacitance. With the fine tuning control, I can tune all the way up to 17900KHz with that coil plugged in.
PDF No. 23
No. 23 - How To Fix a Receiver That Squeals and Motorboats. Title. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Author. NRI - National Radio Institutes, 1949; Scanned by Mike Yancey, 2012. Subject. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Keywords.
2 transistor too Simple SW radio: the Regenerative principle and Q
The video shows the principles of regenerative Shortwave radio reception and Q multiplying. Basic schematic is here https://youtu.be/fVJ57DyY-oI (I told thi...
regenerative radio receivers
A regenerative radio receiver is unsurpassed in comparable simplicity, weak signal reception, inherent noise-limiting and agc action and, freedom from overloading and spurious responses. The regenerative radio receiver or, even super-regenerative radio receiver or, "regen" if you prefer, is basically an oscillating detector receiver.
Sputnik Regenerative Receiver
The Sputnik regenerative receiver was designed for the 40m amateur radio band, the perfect project for beginners in homebrew radio receivers. ... If the voltage drops under 12v, the LM386 IC will end up creating that ugly "motorboat" sound. To improve stability in frequency I used D4 9.1v Zener diode.
PDF The Modern Armstrong Regenerative Receiver
The pioneering work of Major Armstrong on the regenerative receiver has come to our days in the form of the so called Armstrong circuit, the most popular receiver used by ... such as low-frequency motorboating at some value of the throttle capacitor, or the receiver breaking into oscillation when the throttle capacitor's vanes are fully ...
SV3ORA website
Tuning a regenerative receiver is a two-step process. The frequency and the regeneration have to be tuned together. You can find many information on the internet on how to tune such a receiver. Nevertheless, tuning complexity often provides the listener with interesting features, allowing him to tune the receiver exactly the way he likes.
How I built a shortwave Armstrong FET regenerative receiver
2) The Armstrong regenerative detector with its tickler coil and throttle is, of course, the heart of the project. The way it is configured, it is easy to tune, stable and fun to use. 3) An LM386 0.25 watt audio amplifier that is configured for a voltage gain of 200 (which is its maximum).
Regenerative Radio Receivers
How it Works. A schematic of the regenerative receiver is provided in Fig. 1. It works as follows. The incoming RF signal is taken from the antenna and passed through a tunable band-pass filter tank so as to select the desired channel. That signal is then amplified by a triode or other device. The amplifier's output signal is then fed back into ...
Motorboating; what is it, 'why?', and how to fix it?
Motorboating is a low frequency oscillation, often due to feedback though the power supply. Coupling caps shouldn't be too big, power supply filters may have to be larger if your supply has more droop than Fender's original. The original 5E2 circuit used 22K and 8 uF for the filter to the two 12AX7 stages - you may have reduced that resistor ...
PDF A Simple Regen Radio for Beginners Notes
A Simple Regen Radio for Beginners Notes QST September 2000, pp, 61-64 By Charles Kitchin, N1TEV ... of a simple whip antenna makes this receiver extremely portable and prevents it from interfering with other receivers in the area. Q1 is a very high gain bipolar transistor. While it offers extremely high sensitivity, smooth
James Stanley
Fair enough. The KRC-2 seems to be an unusual regenerative receiver, in that it uses a 10.7 MHz oscillator mixed with the incoming signal from the antenna, which I haven't seen on any other designs. According to the documentation, this reduces spurious emissions and makes the regeneration control more stable.
5Z4FT Regenerative Receiver
The Regenerative receiver has since become the most popular basic receiver for Amateur Radio Operators and Electronics experimenters worldwide. The principle of operation is simple. Positive RF feedback is used to increase the RF gain of the amplifier upto and beyond self-oscillation. With no input RF signal the internal noise peaks and a small ...
Gow to resolve a "motorboating" problem
If motorboating stays the coupling of the oscillator coils might be to high. See also trimmer and paddings. Control the voltages of the mixer and the resistor on the oscillator grid. Please tell us about your success or remaining problem since this is at first only a general view without looking into the schematic of your set.
PDF High Performance Regenerative Receiver
High Performance Regenerative Receiver. circuit's stability for CW and SSB reception. C7 is the throttle-capacitor REGEN ADJUST control. As C7's capacitance is increased, more RF energy is coupled from Q2's drain to ground (and there- fore the ground end of 1.2); this even- tually initiates an RF oscillation.
The KRC-2 shortwave regenerative receiver kit
14 Replies. Tony Westbrook recently contacted me about a regenerative receiver kit he has designed and produced in the UK. It's called the KRC-2. Here's the product description: 1 - 30 MHz with band spread tuning. Regeneration with a difference. The regeneration setting on the KRC-2 is unaffected by the receiver tuning or the antenna ...
equipment design
Sir Douglas Hall's Twin Pentode Receiver seems to be a good fit for the two pentodes you have on hand. Two simpler designs are found in One Valve Receivers, volume 99, number 1 (1951): the "Midget Pentode Receiver" on pp. 8-9 and the "Oscillodyne" on pp. 12-13. The single-tube circuits might play better to your goals by allowing you to compare ...
1956 Two Transistor Shortwave Regen
1956 Two Transistor Shortwave Regen. ... the set consistenly pulled in European and Asian stations and could keep pace with many communications receivers. It also performed well on the standard broadcast band. The set used band switching, and had tuning ranges of 800-1600 kHz, 3.8-6.5 MHz, and 6-13 MHz. Regeneration was adjusted by means of ...
PDF A Simple Regen Radio for Beginners
Mount the headphone jack on the box rear, close to the PC board and the LM386. Attach the RadioShack 39-inch whip antenna to one of the back corners of the box using a small screw and nut. If you use the RadioShack jack specified for J1 (RS 274-276), connect together pins 2 and 5 and attach that common lead to C8.
Everyone Should Build At Least One Regenerative Radio Receiver
Howard Armstrong didn't invent the ZN414. Besides, it's a TRF receiver, Tuned Radio Frequency, which was a step up from a "crystal radio", and was the trend except for Armstrong's receivers.
Fun with Regenerative Receivers
John Fuhring's Regen Receiver - April-October 2016. John Fuhring has an extensive and entertaining account of his attempts at building a Charles Kitchin " Scout Beginner's Receiver " regen kit. Because he was so forthcoming about his ups and downs in his regen saga, I decided that I'd try following in his footsteps for my first ...
Regenerative circuit
Regenerative receiver Vacuum tube regenerative receiver schematic. Most regenerative receivers used this Armstrong circuit, in which the feedback was applied to the input (grid) of the tube with a "tickler coil" winding on the tuning inductor.. The gain of any amplifying device, such as a vacuum tube, transistor, or op amp, can be increased by feeding some of the energy from its output back ...
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2. I have been experimenting with a very simple AM regenerative receiver discussed at circuitbasics.com. The schematic is shown here: I obtain fairly good performance feeding the output to an old Radio Shack amplified speaker. I'd like to build an audio amplifier based on an LM386 op amp as part of the circuit, such as is shown in the same ...
The 15855 - 17850khZ coil stops about 50KHz short of the top of the 16M band, which is nominally 17480 - 17900KHz. However, all these coverage figures are quoted with the fine tuning control set to maximum capacitance. With the fine tuning control, I can tune all the way up to 17900KHz with that coil plugged in.
No. 23 - How To Fix a Receiver That Squeals and Motorboats. Title. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Author. NRI - National Radio Institutes, 1949; Scanned by Mike Yancey, 2012. Subject. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Keywords.
The video shows the principles of regenerative Shortwave radio reception and Q multiplying. Basic schematic is here https://youtu.be/fVJ57DyY-oI (I told thi...
A regenerative radio receiver is unsurpassed in comparable simplicity, weak signal reception, inherent noise-limiting and agc action and, freedom from overloading and spurious responses. The regenerative radio receiver or, even super-regenerative radio receiver or, "regen" if you prefer, is basically an oscillating detector receiver.
The Sputnik regenerative receiver was designed for the 40m amateur radio band, the perfect project for beginners in homebrew radio receivers. ... If the voltage drops under 12v, the LM386 IC will end up creating that ugly "motorboat" sound. To improve stability in frequency I used D4 9.1v Zener diode.
The pioneering work of Major Armstrong on the regenerative receiver has come to our days in the form of the so called Armstrong circuit, the most popular receiver used by ... such as low-frequency motorboating at some value of the throttle capacitor, or the receiver breaking into oscillation when the throttle capacitor's vanes are fully ...
Tuning a regenerative receiver is a two-step process. The frequency and the regeneration have to be tuned together. You can find many information on the internet on how to tune such a receiver. Nevertheless, tuning complexity often provides the listener with interesting features, allowing him to tune the receiver exactly the way he likes.
2) The Armstrong regenerative detector with its tickler coil and throttle is, of course, the heart of the project. The way it is configured, it is easy to tune, stable and fun to use. 3) An LM386 0.25 watt audio amplifier that is configured for a voltage gain of 200 (which is its maximum).
How it Works. A schematic of the regenerative receiver is provided in Fig. 1. It works as follows. The incoming RF signal is taken from the antenna and passed through a tunable band-pass filter tank so as to select the desired channel. That signal is then amplified by a triode or other device. The amplifier's output signal is then fed back into ...
Motorboating is a low frequency oscillation, often due to feedback though the power supply. Coupling caps shouldn't be too big, power supply filters may have to be larger if your supply has more droop than Fender's original. The original 5E2 circuit used 22K and 8 uF for the filter to the two 12AX7 stages - you may have reduced that resistor ...
A Simple Regen Radio for Beginners Notes QST September 2000, pp, 61-64 By Charles Kitchin, N1TEV ... of a simple whip antenna makes this receiver extremely portable and prevents it from interfering with other receivers in the area. Q1 is a very high gain bipolar transistor. While it offers extremely high sensitivity, smooth
Fair enough. The KRC-2 seems to be an unusual regenerative receiver, in that it uses a 10.7 MHz oscillator mixed with the incoming signal from the antenna, which I haven't seen on any other designs. According to the documentation, this reduces spurious emissions and makes the regeneration control more stable.
The Regenerative receiver has since become the most popular basic receiver for Amateur Radio Operators and Electronics experimenters worldwide. The principle of operation is simple. Positive RF feedback is used to increase the RF gain of the amplifier upto and beyond self-oscillation. With no input RF signal the internal noise peaks and a small ...
If motorboating stays the coupling of the oscillator coils might be to high. See also trimmer and paddings. Control the voltages of the mixer and the resistor on the oscillator grid. Please tell us about your success or remaining problem since this is at first only a general view without looking into the schematic of your set.
High Performance Regenerative Receiver. circuit's stability for CW and SSB reception. C7 is the throttle-capacitor REGEN ADJUST control. As C7's capacitance is increased, more RF energy is coupled from Q2's drain to ground (and there- fore the ground end of 1.2); this even- tually initiates an RF oscillation.
14 Replies. Tony Westbrook recently contacted me about a regenerative receiver kit he has designed and produced in the UK. It's called the KRC-2. Here's the product description: 1 - 30 MHz with band spread tuning. Regeneration with a difference. The regeneration setting on the KRC-2 is unaffected by the receiver tuning or the antenna ...
Sir Douglas Hall's Twin Pentode Receiver seems to be a good fit for the two pentodes you have on hand. Two simpler designs are found in One Valve Receivers, volume 99, number 1 (1951): the "Midget Pentode Receiver" on pp. 8-9 and the "Oscillodyne" on pp. 12-13. The single-tube circuits might play better to your goals by allowing you to compare ...
1956 Two Transistor Shortwave Regen. ... the set consistenly pulled in European and Asian stations and could keep pace with many communications receivers. It also performed well on the standard broadcast band. The set used band switching, and had tuning ranges of 800-1600 kHz, 3.8-6.5 MHz, and 6-13 MHz. Regeneration was adjusted by means of ...
Mount the headphone jack on the box rear, close to the PC board and the LM386. Attach the RadioShack 39-inch whip antenna to one of the back corners of the box using a small screw and nut. If you use the RadioShack jack specified for J1 (RS 274-276), connect together pins 2 and 5 and attach that common lead to C8.
Howard Armstrong didn't invent the ZN414. Besides, it's a TRF receiver, Tuned Radio Frequency, which was a step up from a "crystal radio", and was the trend except for Armstrong's receivers.
John Fuhring's Regen Receiver - April-October 2016. John Fuhring has an extensive and entertaining account of his attempts at building a Charles Kitchin " Scout Beginner's Receiver " regen kit. Because he was so forthcoming about his ups and downs in his regen saga, I decided that I'd try following in his footsteps for my first ...
Regenerative receiver Vacuum tube regenerative receiver schematic. Most regenerative receivers used this Armstrong circuit, in which the feedback was applied to the input (grid) of the tube with a "tickler coil" winding on the tuning inductor.. The gain of any amplifying device, such as a vacuum tube, transistor, or op amp, can be increased by feeding some of the energy from its output back ...