Diy shortwave radio

shortwave radio transceiver and comes as a kit of parts. The bands covered are: - 3.5MHZ 7MHZ 10MHZ 14MHZ 21MHZ 29MHZ (depending on the VFO settings used) and the modes covered are CW LSB USB. You have to supply the VFO, PA, PA switching and output LPF etc. as extras I do not intend to go into this in depth. 2. Starting the build

More. This is a Preselector for SW receivers (diy hf preselector) circuit. The entry low capacitance of MOSFET modern, with two gates, will create negative inverse reaction through a uncoupled source resistor. Applied right this technique allows the creation of a entrance RF stage field with a relatively high dynamic range.Best Shortwave Radio Reviews. 1. Mesqool Shortwave Radio. This 7-programmed NOAA Weather forecast radio enables good reception for both AM and FM radio with the shortwave stations even if the antenna is down. You can change channels in this device by simply turning a knob in place of adjusting a dial.A simple wire can make a huge difference and cost almost nothingMany small tuning ranges (37.9 kHz at 10 kHz and 61.7 kHz at 30 MHz) can be tuned by the 10 turn potmeter. Press the up/down switches to go to the nearest next small tuning range. For large frequency changes, set S1 to coarse tuning. Otherwise you have to press the up switch 1000 times to go from 10 kHz to 30 MHz!!﹀Lightweight Compact: Short wave radio telescopic antenna material using aluminum alloy shell, very lightweight and compact, easy to assemble and carry, weighing only 271g. ﹀High Quality: The short wave radio telescopic antenna is made of high-strength 201 reinforced stainless steel, which is durable and can also reduce the sag when erecting.

Zerone HAM Radio QRP Kit Forty-9er 3W CW Shortwave Radio Transmitter Receiver Telegraph DIY Radio Kit. 40. Limited time deal. £1550. Was: £19.38. FREE delivery Fri, 5 Apr on your first eligible order to UK or Ireland. Or fastest delivery Tomorrow, 3 Apr. Only 7 left in stock. Add to basket.This antenna spans a tuning range spanning 3.5 MHz through 40 MHz and thus covers 80 – 10 meters on the amateur radio bands, all international shortwave bands plus the 11 meter CB bands. The antenna comes with a 3′ coaxial cable to attach the antenna BNC output to a SO-259/PL-259 input of your receiver (most receivers).2.8 inch TFT colour display with Touch screeen. Small D-Class power amplifier board. Speaker. Lithium Battrey 3.7 Volts. Lithium battery charger. Upconverter board 3.7 to 5V. Rotary encoder. and Potentiometer. Si4732 chip can be purchased on Aliexpress at a price of about US $ 10 for one piece, or US $ 21 for 5 pieces.Over on the swling.com blog admin Thomas has been exploring various indoor antenna options for pairing with an HF capable software defined radio. He notes that unless you happen to live in …01. Sangean ANT-60 Shortwave Antenna. Check Price on Amazon. Allow us to introduce the versatile Sangean ANT-60 antenna, designed to enhance the performance and reception of any shortwave radio. What makes this indoor shortwave antenna particularly appealing is its compatibility with various shortwave radio models, not limited to Sangean alone.DIY SW, MW, SDR Radio with ESP32 and Si5351. Sensitive retro look radio capable of receiving signals from middle wave and short wave band. Advanced Full …AM/FM/SW1-2 Radio Shortwave Transistor Radio AC or Battery Operated with Best Reception Big Speaker and Precise Tuning Knob with AUX in & 3.5mm Earphone Jack. 3,661. 50+ bought in past month. $2599. FREE delivery Sat, May 4 on $35 of items shipped by Amazon. Or fastest delivery Thu, May 2. Price may vary by color.

Test the audio transmission and reception by speaking into one walkie talkie and listening for the audio on the other. Take the walkie talkies to different locations and assess the range of communication. Experimenting with different antennas can also enhance the range of the walkie talkies. 4. Ham Radio Receiver.This video shows what can be achieved with a simple wire antenna for Shortwave Radio Listening. It also shows the practical impact of having a good "ground" ...You may need to make your own random wire antenna with a soldering kit, insulated wire and 3.5mm mono plug for the antenna jack on your D-808. Someone here will undoubtedly suggest a Wellbrook active loop antenna for your balcony. They are excellent antennas but will cost at least three to four times what you paid for the D-808.Revered Radio: Introduced in 1986 and weighing in at nearly 9 kilograms, the Grundig Satellit 650 is regarded by some as the best shortwave radio ever built. Photo: Universal Radio. Though they ...Find many great new & used options and get the best deals for DIY Kit Dc9-13.8v S-pixie CW QRP Shortwave Transceiver 7.023mhz With Case A6b5 at the best online prices at eBay! Free shipping for many products!

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Step 12: Breadboarding: Building the Circuit. Once the tube is mounted, mark the tube pin configuration onto the breadboard keep in mind that the datasheets list the pinout as a bottom-view of the tube. I neglected to remember this, and as a result wired the tube pins backwards.More. This is a Preselector for SW receivers (diy hf preselector) circuit. The entry low capacitance of MOSFET modern, with two gates, will create negative inverse reaction through a uncoupled source resistor. Applied right this technique allows the creation of a entrance RF stage field with a relatively high dynamic range.The SWLing Post - (here) We post up-to-date news, reviews, interviews and everything shortwave. New posts are made regularly, often daily. Here, you can easily find our own in-depth shortwave radio reviews. These reviews are comprehensive and typically focus on one model at a time, offering comparisons to other similar radios.Don't forget to use adequate lengths of rope, or safety cord for this project. You can use PVC pipe here as an insulator. Cut 3 or 4 pieces of 1 1⁄2 inch (3.8 cm) PVC pipe about 6 or 7 inches (15.2 or 17.8 cm) long. Drill 1⁄2 inch (1.3 cm) holes using a good drill bit, and never drill close to the end of the pipe.

This is a wide band shortwave SW antenna amplifier. The frequency band is 1 to 30 MHz and a medium gain of 15 dB. The input stage is built with MPF102 and the other stages with 2N3904. The power supply is 9 V and the output impedance is 50 Ω. Below you have the sw amplifier schematic and recommended printed circuit board.DIY 45W SSB HF Linear Power Amplifier Amateur Radio Transceiver Shortwave Radio Development Board Kit $ 36.79 Availability: In Stock Shipping: ... DIY 45W SSB HF Linear Power Amplifier Amateur Radio Transceiver Shortwave Radio Development Board Kit Note: 2sc1971 has long been Stop production, so this version uses disassemble parts, please note ...This video shows what can be achieved with a simple wire antenna for Shortwave Radio Listening. It also shows the practical impact of having a good "ground" ...Welcome to QRPGuys. QRPGuys is an organization of hams that offer budget and unique ham radio kits. Our specialty will be low cost, high enjoyment kits for the builder that can be assembled in an evening or two. The criteria for our kit designs, are items that are unique in some way, combine features not normally seen, low in cost, and provide ...When done, just bare the wire, screw it on to an alligator clip and attach it to the telescopic antenna. If you don't have a tree let's try creativity: Run the wire out a the window and clip it to the end of a metal downspout which is hopefully well attached to a gutter. If you have an attic run the wire in a corner and drill a tiny hole ...A Short Wave Regenerative Receiver Project - tuberadio; A Simple Regen Radio for Beginners - QST September 2000, pp 61-64; Circuit. I’ve redrawn the original schematic in EasyEDA for my study, available here. Variations in my build: used 2.2kΩ for R12 instead of 2.7kΩ (due to parts on-hand). Works fine, probably increases the AF amp gain.The circuit for this receiver is shown in Figure 2. Figure 2 The LM386 can be used as a tuned radio frequency receiver. A regenerative medium-wave receiver. The datasheets for the LM386 indicate that its gain is greater than unity (10 dB) at frequencies exceeding 1 MHz ( Figure 3 ). For this reason the LM386 is able to oscillate in the medium ...If you know the specific band you would like to use you can get more gain if you trim it to the wave length of the frequency you want to use it on. 234 divided by frequency is the formula for 1/4 wave length for practicle antenna use (234/f). So if you wanted to listen mainly around 5MHz you are looking around 45 feet.1x100k-30MHz MLA-30+ Loop Antenna Active Receiving Antenna for Short Wave Radio. Opens in a new window or tab. Brand New. $36.09. ... Shortwave Radio Balun DIY KIT for Ham Radio 1-30MHz NXO-100 Magnetic Balance. Opens in a new window or tab. Brand New. $10.16. mylove2014alice (2,454) 97.2%.ALPS Variable Capacitor meshed adjustable around 450 pf for Crystal Radio Amplifier Homebrew diy kit qrp Loop Antenna Tuner am fm mw sw Shortwave Radio. New (Old Stock) Item from ALPS JAPAN Customer reviewsThis antenna can also be modified for transmitting on the Amateur Radio HF bands. But as a simple shortwave receiving antenna, this project will perform very well. The old Radio Shack DX-384 featured in the video is still a decent receiver for shortwave listening. Here are some comments from Jez: In this weeks video we build a simple long wire ...Description: This is a very small shortwave radio transmitter receive assembled accessory for Forty-9er. The output power is raised to 3W, which has a strong remote communication capabilities, enhance the Forty-9er practicality. Coming with ciecuit diagram can guide you to install well. It has high performance and super durability, the ...

1x100k-30MHz MLA-30+ Loop Antenna Active Receiving Antenna for Short Wave Radio. Opens in a new window or tab. Brand New. $36.09. ... Shortwave Radio Balun DIY KIT for Ham Radio 1-30MHz NXO-100 Magnetic Balance. Opens in a new window or tab. Brand New. $10.16. mylove2014alice (2,454) 97.2%.

It's a simple matter to measure and assemble a 22-foot piece of the line and then cut back one conductor on each side to the proper length for 10 meters. You can do the same thing for the 40/80-meter sections, but you can reduce the amount of open-wire line needed by splicing on a single wire for the 80-meter extension.HF Loop Antenna DIY - Simple & Easy to Build Advantages: Simple & Cost Effective, Suitable for Indoor Installations, Compact in Size, and High Directivityhtml lang="en">. Coil Winders Links Page. K4ZAD's DIY Coil Winding Calculator Links. Radio home brewers have an easy time working with resistors and capacitors; they come in neat little packages and their values are easily determined, but working with inductors isn't as easy. To obtain the inductance and other characteristics desired, coils ...The antenna covers 5 MHz through 14 MHz. Here are some general comments regarding this DIY antenna. "HF Loop Antenna DIY - Simple & Easy to Build Advantages: Simple & Cost Effective, Suitable for Indoor Installations, Compact in Size, and High Directivity". For the latest Amateur/Ham Radio news and information, please visit …Mar 27, 2022 ... Comments239 · Three Types Of Radios You Need Right Now. · The MLA-30 Shortwave Loop antenna. · Shortwave radio antenna and ground demonstratio...Mike November 24, 2014 at 11:11 pm. Size steps: AM BCB – 10 kHz steps (if there is a way to change to 9 kHz, I haven’t found it) FM BCB – 0.2 MHz steps SW – 5 kHz steps The tuning on SW uses an accelerating scheme – the longer you press the button, the faster the tuning steps. The receiver is muted during scanning, but I don’t hear any “soft muting” …S-Pixie Kit is a small and exquisite shortwave radio station, working mode is CW. Transmitting local oscillator frequency: 7023KHz; receiving local oscillator frequency: about 7023-7026KHz. ... So I purchased this receiver for my nieghbor because the DIY kit purchase failed with not enough parts to complete the build. And thus far all we can ...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 coupling.

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To bias the FET properly (make the gate "negative" with respect to the source (or cathode) and thus set the current through the FET to the right level), it is necessary to have a bias network between the source and ground. Biasing is accomplished by simply using a 10K resistor and a bypass 0.001 MFD capacitor.Here are plans for building a shortwave radio receiver using 3 transistors, a simple homemade coil, an Air Variable Capacitor and some common electrical parts. This circuit is from Charles Kitchin, who has provided a …468 divided by 5.90 = 79' 3". The number 468 divided by the frequency above is the formula for calculating a half wave antenna length used all the time by Amateur radio operators in building many different kinds of antennas. You'll need about 435 feet of wire for this antenna plus appropriate length of coaxial cable.Bring the signal into the house with coax cable, 50 or 75 ohm makes next to no difference. Ground the coax shield to a ground rod outside to shunt common mode current to ground and keep the noise level down. Or place a counterpoise the same length as the antenna wire on the ground, connected to the coax shield.Use masking tape to fasten the foil square to the white paper. Tape all around the foil square to ensure it sits smoothly against the paper. 5. Fasten the paper-foil square around the paper towel roll. Wrap the square around the roll with the aluminum side facing out, and tape it to create a tube.May 19, 2010 ... The tuning capacitor was a air plate type taken from an old radio ... Please support our generous sponsors who make AmateurRadio.com possible: ...shortwave radio transceiver and comes as a kit of parts. The bands covered are: - 3.5MHZ 7MHZ 10MHZ 14MHZ 21MHZ 29MHZ (depending on the VFO settings used) and the modes covered are CW LSB USB. You have to supply the VFO, PA, PA switching and output LPF etc. as extras I do not intend to go into this in depth. 2. Starting the buildTest the audio transmission and reception by speaking into one walkie talkie and listening for the audio on the other. Take the walkie talkies to different locations and assess the range of communication. Experimenting with different antennas can also enhance the range of the walkie talkies. 4. Ham Radio Receiver.Dec 13, 2018 ... I figure I can solder taps onto the coil as needed. The big problem is my intended size is way outside the norms, so is this possible? diy ...Jun 21, 2021 · Here’s the clip for attaching the antenna to “something”. Most all portable shortwave radios will have a telescoping antenna as well as one that’s built inside (mainly for AM radio band reception). Some radios (usually the higher priced models) will have an external antenna jack, usually a 3.5mm (1/8″), where you can plug in your own ... It may be used without an antenna tuner, but ... it works best when you do use a tuner. Here are the easy-to-follow, step-by-step building instructions for Arnie Coro's "Broomstick Special": 1. Obtain a nice broomstick.... you can use a "classic" wooden dowel broomstick, or substitute heavy walled PVC plumbers plastic tubing. 2.The amateur radio station on the ISS can be received using very simple equipment. History The first Amateur Radio equipment was delivered to the International Space Station (ISS) in September 2000 and an Amateur Radio station was established onboard for use by Astronauts who are licenced Radio Amateurs. Commander William Shepherd, KD5GS, made the first… ….

Mike November 24, 2014 at 11:11 pm. Size steps: AM BCB – 10 kHz steps (if there is a way to change to 9 kHz, I haven’t found it) FM BCB – 0.2 MHz steps SW – 5 kHz steps The tuning on SW uses an accelerating scheme – the longer you press the button, the faster the tuning steps. The receiver is muted during scanning, but I don’t hear any “soft muting” …A multiband portable and indoor antenna suitable for QRP operations based on an original idea by W9SCH that described this small loop in Sprat 60. 5 Band Indoor Magnetic Loop. G4IZH. A indoor magnetic loop antenna that covers 20 17 15 12 and 10 meters band with a 3 meter lenght of 22 mm copper tube by G4IZH. A Cheap Indoor Dipole for 80m-15m.Just like the DIY SWL Kits made famous by your local Radio Store years ago ; Brief content visible, double tap to read full content. Full content visible, double tap to read brief content. ... GOOZEEZOO Active Shortwave Radio Loop Antenna GA450 with BNC Cable SW 2.3-30MHz MW 522-1710KHz Portable Receiving Antenna for Ham Radio 26. $89.99 $ 89. 99.The Tecsun PL-360 is a portable digital AM/FM shortwave radio. This PLL synthesized receiver picks u.. रo 5,862.24 Ex Tax:रo 4,968.00. Add to Cart. ... FM Micro SMD Radio DIY Kit - HX3208. Features: HX3208 suite adopts electric tunning monolithic FM integration circuit and tunning.. रo 318.60 Ex Tax:रo 270.00.Open Source SDR Transceiver Radio Receiver with 8 Bands, USDX QRP HF, DIY, Built in Lithium Polymer Battery, for Shortwave Radio Transmission (US Plug) Visit the Cuifati Store. $176.67 $ 176. 67. Eligible for Return, Refund or Replacement within 30 days of receipt .5.6m Telescopic Metal Long Antenna - PUTIKEEG DIY Shortwave Radio Stainless Steel Tie Rod Antenna with M10 Male Wire Interface Multifunctional Oscillator Support Positive V/GP/YAGI Antenna Design. Recommendations. RuiLing 2 Pack M3 Male Thread 7 Section AM FM Radio Universal Antenna for Radio TV Electric Toys, …Radio is important in the 21st century because it provides an opportunity for people who cannot access television and cannot read to keep up-to-date on the news and trends. The rad...I wanted to build a radio receiver designed by N1TEV for a long time. Thanks to my friend Henrik ( DK8HM ) for the PCB he sent me to build this receiver.73, ... Diy shortwave radio, via YouTube Capture A portable Broomstick antenna I made to take out in the field for SWL Easy to make with minimum cost. I put an alligator clip on the othe..., Connect an outside antenna and earth ground to the A and G terminals. Tune in a station, then reduce the volume. Then tune the tuner for a peak. You will be surprised! Just think how your kids can blast the house with Radio Disney with the same 10 songs all the time. Who Let the Dogs Out!!, In fact, an ATU will pre-select the range of frequencies you want to hear and by default reject the rest. This can improve signal-to-noise ratio, so improving your perception of the signal you want to hear. A modern radio passes a band of frequencies (band pass tuning or filtering) for processing. In that band, signals large and small appear., If you are interested in building a very simple shortwave regenerative radio, you might want to consider experimenting with the coil of my Armstrong "Crystal" Radio, but with fewer turns for shortwave. , PART2: Shortwave 41 Meter Band, These are typically in the HF specturum (kHz up to 30 MHz). Listening to police/fire/EMS is a bit of a different animal. Depending on where you are, public service agencies could be on VHF low band (30-ish MHz), VHF (136-174MHz), UHF (300+ MHz), 700/800, or 900MHZ. Some may be analog, some may be digital, some may be encrypted digital!, To build a 40’ antenna mast, you will need to: Gather all materials beforehand. Find and level a good spot for the antenna. Build the base of the antenna and fill it with cement. Build the center pivot point. Using the winch and pulley, raise the mast of …, John Figliozzi is an expert and author of The Worldwide Listening Guide, now, in its tenth edition. He explained it like this: "Shortwave radio is a legacy technology using the ionosphere to bounce radio signals over a wide and long distances." That means it can be heard thousands of miles away. [Continue reading at TPR…] DIY Radio ..., This entry was posted in How To, Kits, News, Radios, Shortwave Radio and tagged ELECTRONIC PROJECT KIT #28-110, Home Brew, homebrew shortwave, RadioShack 28-110, RadioShack Shortwave Kit on July 10, 2015 by Thomas., A shortwave listener, using an attic shortwave antenna, wrote HamRadioSecrets.com asking for suggestions on how to improve his reception. The description he gave of his installation revealed several shortcomings that could easily be remedied by: eliminating the sources of signal loss; removing a potential source of parasitic interference;, Amazon Affiliate Store: https://www.amazon.com/shop/iridium242 Prep With My Patriot Supply: http://www.preparewithiridium.comThrive Life Freeze Dried Food St..., 1 Set DIY Radio 40M CW Shortwave Transmitter QRP Pixie Kit Receiver 7.023-7.026MHz Short Wave Transmitter DC 9V-14V. $11.06 $ 11. 06. $1 delivery Apr 26 - May 16 . Or fastest delivery Apr 11 - 15 . Add to cart-Remove. Bestseller in Portable Radios., In today’s busy world, it’s always good to know what’s going on with the weather. Whether you’re at home or on the go, you can’t afford to miss weather warnings. That’s why it’s im..., Another antenna option is a DIY shielded loop. Plenty of how-tos from a Google search using regular coax and baluns made from VGA cable ferrites. ... Shortwave radio is dead. 50 years ago before the internet, such a gadget was useful but not anymore. The air is full of interference and the only SW stations are religious or political propaganda ..., Shematic from a 3 transistor radio (direct reception, no superheterodyne) to receive radio stations on MW (600 KHz - 1,6 MHz) and Shortwave (2-12 MHz). The ..., This antenna tune kit comes with the standing wave directions. Using a T-type topology network, shortwave 1-30MHz. Can withstand the transmit power of 15W. The tuning range of approximately 30-300 ohms. Very convenient for QRP communication, to ensure high efficiency radio transceiver in communication, but also allows you to fully enjoy the fun ..., ﹀Lightweight Compact: Short wave radio telescopic antenna material using aluminum alloy shell, very lightweight and compact, easy to assemble and carry, weighing only 271g. ﹀High Quality: The short wave radio telescopic antenna is made of high-strength 201 reinforced stainless steel, which is durable and can also reduce the sag when erecting., World-wide stations come in loud and clear Build this shortwave regenerative receiver kit and sit back and enjoy listening to the world. The VEC-102K covers all or part of 75/80, 49, 40, 30, 31, 20, 25, 22, 19, 17, 16, 15, and 13 Meter bands. It lets you listen to AM, SSB, CW, WWV, RTTY, and packet. The kit offers smoo, 1625 Shortwave Regen Radio approx. 3.6 to 14.15mhz, continuous coverage (Works with 12 Volt Power) KW7T 5 out of 5 stars. ... Portable Radio Receiver Kit FM PCB DIY Electronic Kits 76MHz-108MHz ad vertisement by SolderShop Ad vertisement from shop SolderShop SolderShop From shop SolderShop $ 9.75., In fact, an ATU will pre-select the range of frequencies you want to hear and by default reject the rest. This can improve signal-to-noise ratio, so improving your perception of the signal you want to hear. A modern radio passes a band of frequencies (band pass tuning or filtering) for processing. In that band, signals large and small appear., Open Source SDR Transceiver Radio Receiver with 8 Bands, USDX QRP HF, DIY, Built in Lithium Polymer Battery, for Shortwave Radio Transmission (US Plug) Visit the Cuifati Store. $176.67 $ 176. 67. Eligible for Return, Refund or Replacement within 30 days of receipt ., Many current hams and radio enthusiasts were introduced to the hobby by building and listening to such classics as the Radio Shack Globe patrol, or the Knight Ocean Hopper. It has been many years since there has been a simple shortwave receiver kit on the market, so the Ozark Patrol is offered so that the builder of today can relive the ..., Learn how to combine the Si4844-A10 analog-tuned radio receiver with an Arduino to make a full-featured multiband radio. The project uses a microprocessor to control the tuning, audio output, and display of the radio. The circuit requires a small amount of antenna support and some soldering skills., Jun 29, 2019 ... Comments173 · Prepping Do It Yourself Tip Shortwave Long Wire Antenna · Shortwave radio antenna and ground demonstration · How to make a Ham R..., In what [Micha] half-jokingly calls a "74xx-Defined Radio", easily obtained discrete logic chips, along with some op-amps and a handful of simple components, take the place of the tuned LC ..., Fold it, insert it into the hook on the balun and twist it around itself. Use between four to six twists. Strip off approximately 0.5cm of the enamel on each end of the wire with a knife, sandpaper or some other tool. Insert the exposed ends of the wire into the screw terminals and screw it firmly into place., Dec 13, 2018 · For the specifics of winding your inductor, it is best to rearrange formula 1 to find the value of L for a given capacitor value and a given target frequency: L = ( 1 (2πf))2 C−1 (2) (2) L = ( 1 ( 2 π f)) 2 C − 1. So for your shortwave example, if your capacitor is set to 500 pF (500 x 10 -12 farads) and you wish to receive a frequency of ... , Sep 4, 2018 · It sounds like you’re currently using a slinky antenna and a portable PK Loop HF antenna. The PK Loop. You’re on the right track with a PK Loop if you live in an apartment and have no way of putting an antenna outdoors. Being a small magnetic loop antenna, the PK Loop should help mitigate a bit of the noise in your apartment building. , Shortwave radio is a frequency that operates somewhere between the FM and AM bands on your standard radio set. Shortwave can travel exceptionally long distances, which makes it an excellent option for anyone hoping to reach a wide audience. In Canada, the US, and Europe, local FM/AM broadcasting is freely available., hams to learn radio basics. It provides good general-coverage reception of the short-wave bands from 1.6 to 25 MHz, which includes the 80, 40, 30, 20, 17, 15 and 12-m ham bands. It offers good sensitivity and selectivity and is very portable, powered by two 9-V batteries. It has provision for operating on an external ac supply and can be user , A simple regenerative receiver designed for the 40m amateur radio band with decent receiving capabilities, the perfect project for beginners in homebrew radi..., 5. Broadcast. Run the PiFM code. You’ll do that by running a command like “sudo ./pifm awesomejams.wav 100.0”, where that “100.0” is the frequency in MHz on which you’re broadcasting ..., R1 - 10 kOhm. R2 - 150 kOhm. R3 - 1 kOhm. That's all you need to make this shortwave transmitter circuit . Power up the circuit with a clean 3 V to 5 V DC supply, i.e with a single Li-Ion battery is. You can also replace the 10.7 MHz ceramic resonator with any other between 2.3 MHz to 26 MHz range.