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HF Propagation


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Multiband HF Projects - Receivers

17EW8 regenarative radio by JF1OZL
I will show you that, the old triode can be used by low voltage about 12 volts. Please see the circuits. Regenerative radio in old days can make its activity by 17V-DC.

4 transistors handcraft AM radio “NR4K” for kids by JH5ESM
I have written an article on handcraft radio in Eleki-Jack magazine, where toilet paper cores play most important role.
However, the one-chip radio IC LMF501T (compatible with MK484) has already been discontinued and will become hard to find it.
NR4K (abbreviate for “New Radio for Kids”) is designed for LMF501T replacement.

6x2 Superheterodyne Receiver by AA8V
The 6x2 superheterodyne receiver is a 6 tube, 2 band receiver for 80m and 40m with a special position for receiving WWV at 5 MHz. Modes are CW, SSB, and AM, The receiver features a powerful 4 watt audio amplifier, crystal filter for single-signal reception, and 100 kHz crystal calibrator.

8 Band Superhet AM Receiver by VK3HN
Amplitude Modulation holds a fascination for me. It dates back to those hours spent as a teenager listening to the big broadcast-like amateur AM stations in the 1970s and 80s, on 160, 80 and 40 meters.

A 0V1 Tube Receiver by PA2OHH
When I was a beginning radio amateur, I wanted already to make a 0V1 radio receiver with a tube. But it never came so far. When I told that to my colleague Alfred, he gave me a nice present, all kinds of parts to make a 0V1 tube receiver!

A good regenerative receiver with simple fine tuning/A> by PA2OHH
By adding a simple fine tuning, tuning to SSB stations is not a problem at all, not even on the high 18MHz band, reception of that band is very good with this receiver!

A Mini HF Superhet Receiver for SSB by ZL4SAE
The receiver was constructed on a single PCB using a mixture of techniques. The filters are mounted beneath the board with the remaining circuitry above.

A Regenerative Receiver for Beginners
A modern version of the classic regenerative receiver is shown in Fig 17.75. This project was designed and built by Charles Kitchin. This kind of receiver is easy (and fun) to build ...

A simple crystal set for free power radio by VK3YE
Of any electronic project, the crystal set would have to rate as one of the most popular. Many amateurs are on the air today because of their early construction of a crystal set. Most practical electronic books for beginners include at least one crystal set project.

A simple regen radio for beginners by N1TEV
This simple SW regenerative receiver was presented in QST magazine (issued September 2000), a monthly membership journal of ARRL.

A Simple Regen Radio for Beginners by N1TEV
Need a simple, fun project - possibly for a Scout Radio Merit Badge? This project is a great way to introduce kids of any age to electronics and shortwave listening.

A Three-Transistor Receiver by W1YDS
Even in this age of crowded bands and sphisticated communications systems, there is room for the lowly regenerative receiver. The unit shown in Figs. 1 through 6 is a simple that should be easy for most anyone to build.

A very simple receiver by PA2OHH
"Barefoot" technology or simple, cheap and harmless technology. It was certainly not the intention to make a good receiver. No, the question was what you can receive with a very simple receiver with only one active component.

All Valve Receiver by SMØVPO
Some months ago I began work on an all valve (tube) general coverage receiver for the HF bands. The prototype is now finished, but as I rebuild it on a decent chassis I will post any correction. This should only affect the coil.

Amateur bands SSB/AM/FM Receiver by 4Z4VC


Battery Powered Tube Regenerative Receiver by K5BCQ
This is my attempt to come up with an improved design point relative to the earlier Air Champ AC-100 and see what can really be done with a Regen.

Car radio tunes the amateur bands by VK3YE
This is my attempt to come up with an improved design point relative to the earlier Air Champ AC-100 and see what can really be done with a Regen.

Cigar Box Receiver by SMØVPO
I recently sent to QRP@WW a copy of the "CIGAR BOX TRANSMITTER" which was published in the March issue of Practical Wireless. Here is the counterpart to that article, the CIGAR BOX RECEIVER.

Detectrice a Reaction Ondes Courtes une Gamme de F5LVG
Il s'agit d'un récepteur orienté vers les débutants. Il est relativement simple, et reçoit fort bien les stations de radiodiffusions AM. Il permet, en prime, d'entendre des stations de radioamateurs, mais nettement moins bien que les autres récepteurs à réaction décrit dans ce site et conçus pour la réception de la BLU et la CW.

Direct Conversion Receiver with 2 Transistors by DL6ZB
Direct conversion receivers are a joy to operate if they are well designed. The "2 BJT RECEIVER" has a single balanced diode mixer, a tuneable VXO and a single stage AF amplifier. This receiver is build within 2 hours even for the less experienced ham.

DRM Demo Receiver by DF9CY
So far there has not been a change in the oldest technology the Amplitude Modulation (AM) which is used on the Longwave-, Mediumwave- and Shortwavebands since the beginning of radio. But now we are close to have a change... The new technology is called DRM = Digital Radio Mondiale.

Dual Conversion HF Receiver by LU7ADS
Using this architecture tuning is done by the LO Si5351 with up to 1 Hz resolution, and most important as the Si4732 is set at a fixed receive frequency of 21.4 Mhz, the 'chuf-chuf' sound is eliminated when tuning the bands.

Fireball SOP Receiver by N2CX
A "universal" CW receiver for 80m + 40m (easy to adapt for other bands). Full featured, yet simple construction and easy alignment. Direct conversion design for simplicity and performance.

Four tubes low voltage regenerative receiver 3 – 19 MHZ by F5LVG
This SW regenerative receiver has only 12 V for B battery. However, its performance is similar or better than usual regenerative receiver. Output power is good for headphones. It is easy to listen SSB, even on 18 MHz. It uses 4 Russian electronic tubes (6N3P) very similar to ECC81 / ECC85, but with a different pin code.

General Coverage Receiver by ON6MU
This is a compact three transistor regenerative general coverage receiver with fixed feedback. It's based on the principle of the ZN414 only much higher coverage. The sensitivity and selectivity is relative good (especially on the LF and MW bands) as can be expected with this "simple" design.

High Performance Regenerative Receiver Design by N1TEV
There have been several popular Regen projects in recent QSTs and ARRL Handbooks. Look at the design process and progress; then build one - or both - of the receivers described.

Junk Box DC Receiver by 4S7NR
This idea of converting a super-heterodyne radio to a DC receiver came to me when I was a SWL. I built this receiver from a Junked cassette radio. For long time I used to listen to our Ham friends on 40m using my Junk Receiver.

Low Voltage Two Tube Regen Receiver Using "Space Charge" Technology by K5BCQ
This was a fun project and all started when I was looking for low voltage designs for a Regen Receiver and matching Transmitter. Several of the guys on the Glowbugs (GB) Reflector reminded me of "Space Charge" tubes ...

MC3362 multiband CW QRP RX by LY3LP


My First (Homemade) Shortwave Receiver 10kHz-30MHz by PA2OHH
When I made a new start with my old radio hobby, the first item to solve was how to construct something in such a way that the prototype is also useable as the final version.

NA5N Pipsqueak Regen Receiver by WB3GCK
Shortwave radio is what got me interested in this radio stuff in the first place. Ever since I was a kid huddled in front of an old console radio my grandmother gave me, I've been fascinated with the notion of listening broadcasts originating half-way around the world

New high performance regenerative receiver by F5LVG
I made this regenerative receiver for 5 amateur bands : 80 40 20 17 15m. With this Rx and a home made transmitter, I made several SSB QSO between North America and France.

Nouveau récepteur à réaction de F5LVG
La découverte des ondes courtes dans les années 20 et 30 s'est faite essentiellement avec des récepteurs à réaction. À l'époque, ces récepteurs employaient des tubes électroniques de faibles performances.

PLL wideband receiver by JF1OZL
This is a radio receiver covering the frequency from 500kHz to 9MHz. PLL digital tuner is used in this radio, therefore the receiving frequency is set by the switches on the front panel.

Portable Regenerative Receiver With Very Low Supply Current by PA2OHH
It is a modern portable version of the historical regenerative receiver, with transistors and a short telescopic antenna plus RF preamplifier. And it is a real QRP receiver, supply is only 2 mA at 6 volt.

Preá Regenerative Receiver by PY2OHH
Tropicalized version of the famous "Desert Ratt", regenerative receiver for SWLs, hobbists, listeners and radio hams. It uses 3 NPN garden type transistors and a LM386 as the audio amplifier. This receiver can be regarded as a QRP (low power) because the regenerative stage uses some microwatts in order to work.

Quick Receiver by SMØVPO
How many of you have got loads of test equipment in the shack that is not really doing anything most of the time. I have got a couple of RF signal generators and a stereo amplifier (for music) amongst other things.

Récepteur 20 composants de F5LVG
Ce récepteur s’adresse à ceux qui désirent construire leur premier récepteur pour l’écoute des ondes courtes, radiodiffusion et radioamateurs.

Recepteur a Reaction 4 Tubes sous 12V de 150 kHz à 21 MHz de F5LVG
Mon objectif était de faire un récepteur à tube fonctionnant avec une seule tension de 12V au courant le plus bas possible (100 mA).
J'ai choisi le tube soviétique 1j24b car le filament n'a besoin que de 1,2V sous 13 mA. Il s'agit d'un tube à tige, une série spéciale de la fin des années 50 conçue pour des conditions particulièrement difficiles: satellites, missiles, etc.

Recepteur a Reaction a Antenne Cadre de F5LVG
L'originalité de ce récepteur est de permettre l'écoute des ondes courtes sur un récepteur à réaction, sans aucune antenne extérieure par l'emploi d'un cadre. Il est adapté à la radiodiffusion, comme au radioamateurisme.

Recepteur a Reaction Special BLU de F5LVG
Une détectrice à réaction est un récepteur simple relativement sensible du fait de la réaction. Ce procédé consiste à réinjecter à l'entrée d'un amplificateur une partie du signal de sortie qui est alors réamplifié, ce qui augmente de façon importante le gain du montage.

Recepteurs a Reaction Ultra Modernes de F5LVG
Pour les premiers amateurs la découverte des bandes ondes courtes s'est fait avec des détectrices à réaction. Ces montages restent d'actualités, sous réserve d'employer des composants modernes pour s'adapter aux conditions actuelles de réception.

Regenerative receiver by AA5TB
Regenerative receivers have a long history in radio dating back to the first days of the vacuum tube. Though they were once very popular among amateurs and professionals alike, they are now thought of as mere play toys instead of legitimate receivers. Most of this reputation is due to design short cuts that have been implemented over the years.

Regenerative receiver with 6SN7GT by M5GNN
This is my October regenny as it looks right now. It works but more adjustements must be done before I'm happy with it. It's based on the 1950 ARRL handbook design.

Regenerative Short Wave Radio by 7N3WVM
If you happen to have a ferrite bar antenna for short wave reception, try to build a regenerative short wave radio like one shown above.

Regenerative receiver 5.5 to 18 MHz by F5LVG
The receiver described below is designed to be built by a beginner. It uses rugged components. It requires no switching. A single tuned circuit must be realized. Its frequency range is 5.5 to 18 MHz. It is possible to receive the main broadcast bands and ham bands of 20 m and 40 m.

Rod Tubes 12V Regenerative Receiver by F5LVG
My goal was to make a tube receiver operating with a single voltage of 12V at the lowest possible current (100 mA).
The receiver is of the type RF amplifier, regenerative detector, AF amplifier (for headphones).

Shortwave Receiver 10kHz-30MHz by PA2OHH
This receiver was made with use of the experiences of my first receiver. This new one has some improvements and modifications.

Shortwave Receiver by ZL2CTM


Short wave radio by JF1OZL
I will show you one of my first projects. I made it about 13 years ago. This is a radio. It does not have RF amplifier. It has two stage of IF amplifier. It is a normal single super radio.

Small Portable Regenerative Receiver by PA2OHH
The Big portable regenerative receiver is quite successful. The electronic circuit would be very suitable for a small portable receiver if there were not so many controls and switches.

Simple regenerative Radio Receiver by W3HWJ
Charles Kitchin has written many articles about regen radios for QST and other hobby magazines. I like his approach to design and have had good luck with his circuits..

Simple, low cost AM SWBC Receiver by KD1JV
This AM Short Wave Broadcast Receiver is a reasonably simple, but effective design and can be built at low cost. It requires no adjustments to get to work and is more or less fool proof. This makes it a great beginners project, with little or no test equipment.

Superheterodyne receiver - 15 17 20 40 80 m - BJT by by F5LVG
This is a simple receiver for the 15 17 20 40 80 m bands.

Synthesised HF Receiver by SMØVPO
This receiver was originally designed for simplicity and low cost, but, like other projects, it grew. My receiver is now synthesized and the performance is quite comparable to many commercial designs.

The G4AON Universal Receiver by G4AON
This receiver was originally built to replace a Drake R4A which had been used in conjunction with a simple crystal controlled transmitter.

The HBR-3 Amateur HF Receiver for 80-10 Meters by WN2A
HBR-3 Receiver architecture is super-heterodyne, using down-conversion in front of a buffered 80 meter Direct-Conversion receiver.

The Progressive Receiver by AA3SJ
Original design by W7ZOI and K5IRK. My version of the Progressive Receiver was built following the schematics and text found in the 1982 ARRL Handbook, section 8-37ff. The original article is found in QST November 1981.

The Sudden HF Receiver by G3YCC
The Sudden direct conversion receiver was described by Rev George Dobbs, G3RJV in Sprat number 58, back in 1989, and has proved to be a popular little receiver, for which a kit is available from Kanga Products.

Transistor Radio Receiver by ØUPL
I built this simple regenerative short wave radio receiver in 1982 with a lot of help from my Dad. It ran on a 9 volt battery installed in the back of the box, on the right hand side.

Tri-band NE-602/LM-386 based rig with digital display! by WF7I
Somewhere around 2000 I began in earnest to look into “QRP” and building my own radios, and this is where I came across “Experimental Methods in RF Design” and the NE-602/LM-386 based radios.

Two Regen Receivers by SMØVPO
I still think that the simple receiver is a very important part of a QRP station. In the 30s and 40s regenerative radio receivers were very popular; they are simple to build & give very good results, even for CW and SSB operation.

Valve Radio Receiver by GØUPL
This one was a lot of fun. This valve receiver was constructed in 1988 in the traditional way, i.e. an aluminium front panel and chassis. A mains isolating transformer and rectifier was also required, this was built in a separate box ...

Very High Performance Regenerative Receiver by F5LVG
The receiver is built in a wooden box of 12x22x2.5 cm. Adhesive copper foils (5 cm) are glued on the back of the front panel. These bands serve as shielding and ground plane. It is useful to make soldering points between the different strips.

Ham Radio BFO by by VU2AAP
Regular broadcast receivers are meant for reception of AM signals. A simple free running oscillator oscillating at the receiver's IF (intermediate frequency) beats with the incoming signals in either CW or SSB and the resultant audio frequency goes to the AF amplifier.

SSB Adaptor by VK2YBX
Most experienced amateurs know that SSB (single side band) reception requires a receiver fitted with a product detector or BFO (beat frequency oscillator) to reinsert the missing carrier.
They also know that such receivers command significantly higher prices than AM only models.

Creation date : 08/08/2007 @ 23:27
Last update : 23/06/2024 @ 21:57
Category : Multiband HF Projects
Page read 102992 times

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