Operation was found to be satisfactory with the prototype built on a protoboard and a ground plane fixed underneath. About high performance regenerative receiver the resource is currently listed in in a single category. Nov 19, 2015 nostalgia is nothing new, and today, we take a nostalgic look 35 years back at the novemberdecember 1980 issue of elementary electronics. It uses readily available parts and covers 3mhz to around 12mhz. Jul 26, 2015 a regenerative receiver is just an amplifier that is almost but not quite at the point of oscillation. The detector is a plate detector, where rf is fed back to the amplifier via a partially rf decoupled source normally bypassed all the way for rf when used as a detector. The chance to spend all the time i want building and listening to radios is an absolute gift, and the wbr regenerative receiver aug 2001 qst that ive had the pleasure to use these last few days has brought the magic of radio listening back in a big way. Superregenerative receiver for short range hf band applications 1 1 introduction shortrange communication is classified by several properties. Block diagram of the classical superregenerative receiver 3. I wont forget how exciting it was for me to build such a humble radio that so greatly outperformed the crystal receivers that i had been building up to that point. The movements are of the iron free dynamo meter type. Analyze the key aspects of the receivers operation e. Regenerative receiver initiative public group facebook. A baw resonator sets the freerunning frequency of the detector oscil lator.
Regenerative receiver category is a curation of 24 web resources on, a 12volt homebrew regen, designing superregenerative receivers, small portable regenerative receiver. I was determined to replace the diode with a hollowstate equivalent to make a true alltube regenerative receiver. The circuit is a simple lc tank that includes a conductance g representing. Whilst its most important function is to isolate the regenerative stage from the aerial, it also provides a useful amount of gain. The modern armstrong regenerative receiver in pdf format. A high performance regenerative radio circuit salad. A nonregenerative onetube receiver with condenser tuning is shown in fig. The regenerative receiver, regen radio was a popular form of radio receiver in the 1920s and 1930s. Designing superregenerative receivers semantic scholar.
One example is the schmitt trigger which is also known as a regenerative comparator, but the most common use of the term is. Although i much prefer tubes, this one should satisfy those who may want to build and use a more uptodate. Some of the output of the amplifying device is applied back to its input so as to add to the input signal, increasing the amplification. Again, feel free to modify as you see fit, or leave the filter out altogether. How i built a shortwave armstrong fet regenerative receiver. Over the years i have amassed many tv tubes and many of these tubes are interesting because they contain many tube sections in one package. The qrpguys k8tnd regenerative receiver covers the 60, 49, 41, 31, 25 meter shortwave bands approximately 4. A regenerative detector is much more robust than any dual gate fet mixer, it is very sensitive to weak signals and it will demodulate am in addition to single side band and morse code. A regenerative circuit is an amplifier circuit that employs positive feedback also known as regeneration or reaction. Naturally, the sro can only hold its sampled phase and frequency for so long. It is also quite unusual to connect pin 7 to anything but capacitors for bypass or extra input as i have done, so that may change the bias of the input stage. To maintain a low cost of the kit, i used to modify the frequency, diodes that can be found easily d1 and d2.
The original schematic i had posted was of my actual circuit based upon parts i had on hand and this revised schematic is the same circuit with more details and with a few component changes to values that are more readily available. This project was designed and built by charles kitchin. A single vacuum tube may be used as a detector for satisfactory headphone reception up to fair distances. Ive always had a regenerative receiver or two lying around the shack. I have decided that the armstrong ticklercoil type of regenerative detector, seen everywhere, is no longer my favorite. The superregenerative circuit uses an oscillating regenerative detector that. So that settled it, this little box was going to be a regenerative receiver. The basic paradigm of this design is to break up the traditional oscillating detector into a separated regenerative amplifier and detector circuit. This is a new regenerative receiver for the short wave bands.
A regenerative receiver is just an amplifier that is almost but not quite at the point of oscillation. Nostalgia is nothing new, and today, we take a nostalgic look 35 years back at the novemberdecember 1980 issue of elementary electronics. For a regenerative receiver to perform well, three basic requirements have to be met. This gives it very high frequencyspecific gain and a measure of selectivity. Regenerative receiver article about regenerative receiver. A better quality pdf version of the kt5 manual is available from this source. So far, we have shown that rf mems technology can enable new circuit blocks and. This is the heart of the receiver, and could be built as a standalone, minimal regen radio. Below is a revised schematic of a regenerative receiver that i built. See more ideas about ham radio, short waves and radio design.
The schematic is available many places this is one of the first receivers i built, using the version from the radio handbook 1936 regenerative. 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 experimenters. The full design notes are available in two pdf files, the notes below are an extract for this web page. You have a regeneration control, a tuning dial, perhaps a bandspread, and an antenna preselect. Since im getting into 630 meters, i thought id build a new regen for that band, just for jollies.
Contrary to a lot of literature out there, all regenerative receivers are not the same. Feb 20, 2018 ive always had a regenerative receiver or two lying around the shack. Out of the tube pile, i picked a 6jt8 and pulled up the datasheet on the tube. However, he managed to develop a large number of radio circuits utilizing the principle of regenerative amplification or equivalently, positive feedback in amplification circuits. As a result this form of radio deserves its place in this summary of the different types of radio available. This is a homebrew regenerative receiver, mostly based on several designs by charles kitchin n1tev. Drm i do like that the schematic you posted includes a stage of audio preamplification before the lm386. After digging through various tv tubes and pulling up datasheets, i found a 33gy7 that contains a diode and pentode, which could be used as the rectifier and audio output respectively and the 12at7 for the regen and preamplifier. Design and implement a minimalist but practically usable regenerative receiver capable of hf reception from 330 mhz. It was reported to tune from the 22meter band up to the 11meter band with a single set of coils. A thesis presented to the graduate and research committee of lehigh university in candidacy for the degree of master of science in electrical engineering lehigh university december 2017. Some of the newer versions, such as mfjs are pretty good, but theres room for.
High performance regenerative receiver resource detail. Signal input is fed to the emitter e of tr1, and potentiometer vr1 acts as an. So many of these simple designs dont do that, with the result being af output that is marginal for driving a speaker. More regenerative radios click on this link to go to a list of all the regenerative radios on this website. The original post a datasheet of 6sn7 in english can be found here. Groundedbase transistor, tr1, acts as a radio frequency rf amplifier. It is sensitive, very stable, suffers from no microphonic effects at all, and thanks to. To get a wider range of capacity frequency varactor diodes can be used for example from nte electronics. For a regenerative receiver to work properly we need to carefully control the feedback to just. This is exactly what we do in a regenerative receiver.
Here is a simple vhf receiver you can build without any special components or. Feel free to use cad programs to emulate the operation, but be aware that. Superregenerative receiver srr for short range hf band. A non regenerative onetube receiver with condenser tuning is shown in fig. Since it is made for a narrow cwonly band, we can use a trimmer capacitor for a. Regenerative receiver initiative has 1,266 members. Bend the coils free end over to its lead, solder it in place and cutoff the extra wire. This regenerative receiver adjusts regeneration automatically and thus can be used by anyone. The detector circuit was used in a receiver that was lent to me by a fellow ham in 1968 when i just started my amateur radio career. To build and to operate the regenerative regenerative based receiver.
Regenerative receivers have the advantage of simplicity with good performance, and for the last 25 or so years have been a large part of my means for listening to medium wave transmissions. I also considered building a direct conversion radio, but the fact is, a regenerative receiver can easily be used as a direct conversion detector simply by turning up the regeneration. Rockey and shown, as one among many, in the lindsay publishing co. Practical radio circuits part 3 everyday practical electronics. This thesis is brought to you for free and open access by lehigh preserve. The receiver tunes the entire 30m band 1010010150 and performs quite well. This kind of receiver is easy and fun to build and has been used by many generations of hams to learn radio basics. Specifications can be found in a pdf datasheet pointed by this page, in german. Secondary winding 12 and capaci tors c3 and c4 select the received sig nal while tickler winding 1. The antenna preselect can be used as an rf gain control, an antenna trimmer of sorts, and a band selecting device. Headphone level only with diode audio limiters for listener safety power supply.
A regenerative receiver for beginners a modern version of the classic re generative receiver is shown in fig 17. There is a better way, though, to get high gain from the 386 without the particularly high hiss that comes from using that 10uf cap. Hello, and welcome to big nicks alfred morgan 1tube regenerative receiver page. The ultimate regenerative receiver addeddate 20191111 01. This month a regenerative receiver designed for serious listening on the long, medium and short wave bands will be described. A regenerative receiver with agc for 80 meters or 310 mhz. Practical wireless april 20 regenerative receiver post by mike tuggle wed jul 16, 2014 7. Practical wireless april 20 regenerative receiver the. Mar 02, 2016 design and implement a minimalist but practically usable regenerative receiver capable of hf reception from 330 mhz. A regenerative receiver with agc for 80 meters or 310 mhz shortwave. A new regenerative radio receiver the radioboard forums. This link is listed in our web site directory since friday apr 11 2014, and till today high performance regenerative receiver has been followed for a total of 2215 times. The regen radio was one of the many inventions in radio technology that was made by edwin armstrong. Regenerative and reflex receivers this file contributed by kim smith and the radio electronique.
This receiver uses a 2n4416 jfet orj31, which provides a more sensitive detector than an mpf102. Rfic amplitude shift keying ask or onoff keying ook superheterodyne receivers are replacing regenerative receivers in garage door openers, remote keyless entry rke systems, tire pressure monitoring tpm systems, home automation systems and other applications. Of course i had several ways i could go if i built a regenerative receiver into this. See a single transistor, big loop am radio for details. Operation of this receiver is similar to that of a regenerative receiver. The wbr a simple high performance regen receiver for 40m. It was a kit sold by a german company technikversand bremen and worked perfectly well in those days even on the 10 meter band. Where a triode is used for the detector, the plate supply can be varied, or in the case of a pentode, the screen g2 voltage.
It was obviously a superregenerative receiver, it said so underneath. I n basics for a regenerative receiver to perform well, three basic requirements have to be met. High performance regenerative receiver is shown in fig. The circuit is the same as that of an oscillator with the addition of some form of control on the feedback. Regenerative kit identified burstein applebee and also. Regenerative receiver category is a curation of 24 web resources on, a 12volt homebrew regen, designing super regenerative receivers, small portable regenerative receiver. You connect the receiver to a simple wire antenna, that can be a simple wire in the attic, or one thrown up in a tree. Back in 2003, an experimental colpittstype shortwave regenerative receiver was made public on the web by this servant. That magazine was itself taking a nostalgic look back at the early days of radio with a construction article for this onetube regenerative receiver, similar to the circuits in use in the 1920s. This project was my first regenerative radio receiver and one of my favorites as well.
The more i looked at it, the more regenerative receiver regenerative receiver kept popping into my head. Building the ultimate regenerative receiver qrz forums. The new regenerative receiver scheme illustrated below. The receiver includes a lna, a superregenerative oscillator, an envelope detector, agc circuitry with samplehold capability and a baseband amplifier. Build this broadcast receiver from the early days of radio. The main category is regenerative receiver that is about regenerative receiver.
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