Sdr loop antenna

17.01.2021 By Zuzahn

Would you know of a good indoor antenna that would work well with it? This limits your ability to easily try different antenna locations within your home compared to, say, a battery-powered portable radio. It might take some dedicated experimentation and patience. Listening to the final broadcast of Radio Netherlands in an off-grid cabin on Prince Edward Island in But how many radio enthusiasts live in an off-grid cabin? Answer: very, very few!

Most of us only get to experience off-grid life during natural disasters when the electrical grid has been damaged in our neighborhoods. When an antenna is indoors, it is forced to function within this RFI-dense environment. Thus, noise can overwhelm your receiver, essentially deafening it to all but the strongest shortwave broadcasters.

And simple, inexpensive portable amplified shortwave antennas? They amplify the RFI as effectively as they do broadcasters. This is why if you had a means to put a small random wire antenna outside—even if it was simply draped outside a window—it would likely perform better than an indoor antenna. A broadband loop antenna image courtesy of wellbrook.

You would likely design a single passive loop to serve you on a specific brodcast band and would have to retune it as you make frequency changes. You could build a passive loop antenna for less than ten dollars if you can find a good variable capacitor. Commercially produced amplified wideband magnetic loop antennas are not cheap, but they are effective.

The most affordable and portable mag loop antenna I own is the PK Loop. PK Loops are not as broad in bandwidth as the other antennas I mention below. You will have to retune the loop with any band changes and sometimes even within a specific meter band.

Indoor shortwave antenna options to pair with a new SDR

Click here to check out PK Loop offerings on eBay.If so, you can make a trial with the WBL antenna. The WBL covers from 0. The superior noise nulling signal boosting performence coming from the superbly directive element and the built-in low-noise preamplifier. Both of these features will help to uncover the buried signals normally lost when using long wire antennas. The WBL comes with the following features:. For field or portable use, a tripod or a telescopic fishing pole is recommended.

The antenna is powered through coax, so no external wiring is needed. Finally, plug the supplied micro-usb cable to the bias-Tee, and connect the other end to a USB power source, like cell phone charger or a power bank.

Only logged in customers who have purchased this product may leave a review. The WBL comes with the following features: A balanced loop for deep noise signal nulls Built-in high performance preamp for low signal amplification Light-weight and slim stainless steel mm OD wire loop Portable operation possibility — totally weighs only 0.

Additional information Weight 0. Reviews There are no reviews yet. Rated 5.This forum is now suspended and will not accept any new posts or account registrations.

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RTL-SDR antenna. Cheap, Quick, Cheesy.

SDRplay Community Forum This forum is now suspended and will not accept any new posts or account registrations. Quick links. Forum rules. I finally decided to buy a active magnetic loop antenna, the ML from hamradioshop. This antenna covers a frequency range from 9kHz to MHz. I attached the flexible loop via suction cups on the inside of a window.

Initial results are simply spectacular. The previously experienced noise floor caused by home electronics like switching power supplies, computers etc.

Last edited by dc1rdb on Thu Jan 01, am, edited 0 times in total. Reason: No reason. I use the Wellbrook loop ALA and it has saved my bacon. Any attempt to use my vertical wire on RX just gives me S9 of noise on the lower bands, but the loop just ignores it. I can now operate on m again - vertical wire on TX, loop on RX.

Last edited by g1hbe on Thu Jan 01, am, edited 0 times in total. I use a ALA most of the time - absolutely superb antenna. An LA also gets a lot of use. Plus I have several TX loops. I've always been a huge fan of mag loops.

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Last edited by Fones on Thu Jan 01, am, edited 0 times in total. Couldn't a guy just use a 3 foot diameter loop of copper pipe and match the impedance to the SDRplay input with a balun of some description? Last edited by snovotill on Thu Jan 01, am, edited 0 times in total. The whole thing knocked down easily fits in a 25 x 15 cm padded postal envelope so is great for travel.

It is tuned with a small potentiometer in the 2x AAA battery pack at the radio end. Looking at the comments on other web sites, I think some of the units shipped were defective, like so many cheap electronics, so buyer beware. If you don't want to gamble the money, make sure the seller takes returns. The major negative is the varicap tuning voltage is generated in a switching power supply that operates around 3 MHz.

The harmonics are a significant source of interference, especially around 6 MHz. Mine seemed to hit around 6. If I have the time and energy on some upcoming trips I may give it a try in some other cities. I'm not sure how well it will handle the strong signals in Europe, but I might give it a try the next time I'm in Munich. Doug AH6DL. Last edited by snovotill on Sat Aug 06, pm, edited 1 time in total. I like the design and the balanced twisted pair feeder.

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It only takes a minute to sign up. I'm planning to make a magnetic loop antenna mainly for receiving LW, MW, and SW radio broadcasting bands, as well as perhaps the 2. Not all of them with the same antenna, I'mm gone start with LW probably, so I can listen to foreign radio stations. I can use the RTL SDR in direct sampling mode going from basically 1kHz to around 25MHz, so that's technically no problem, but I'm unsure how to attach the magnetic loop antenna my first one is just gonna be something similar to this.

I'm also planning to make a ferrite core antenna, and see how that works out. But that's for a later question. Now, I can use online calculators to get things down like the diameter, the number of turns, and the values for the tuning cap. But I'm unsure about how to attach it to the SDR.

So according to that and the build instructions I can make a box AM loop antenna for the sort of frequency range I'd like.

The pic up loop in those designes goes once around the entire loop of the antenna, and has nearly the same diameter. But how do I actually design the pick up loop? You may be overthinking this. To make a long story short, just connect it and tune the capacitor to resonance and don't worry about the impedance of your pickup loop.

When tuning the radio to antenna system for a transmitter, you have to impedance match the load to minimize reflections because power loss is typically a big deal. Reflections lead to high SWR, and high SWR leads to higher power losses in the coax and heating in both the coax and the radio and all these problems lead to lower transmission efficiency. In a receiver, the power levels are lower, and the losses are much lower, so this is not a big concern.

Typically your amplifier makes up for any weakness in the signal, and you are more concerned about noise from both the amplifier itself and surrounding signals. In the radio antenna system, you need to match the load to 50 ohms.

sdr loop antenna

In a transmitter, the load is the antenna. In a receiver, the load is the radio. Usually the feed line between the antenna and the radio is 50 ohms.

sdr loop antenna

So you match the 50 ohm radio to the 50 ohm coax to the maybe 50 ohm antenna. In a receiver, the radio is already 50 ohms, so the matching there is already done. Making the antenna 50 ohms helps a bit, but it helps a lot more if the antenna is resonant on the target frequency to maximize the weak signal it gets.

So, in the end, you connect the coax to the radio, and how you connect the antenna to the coax is not that big a deal for a receiver, especially since you won't be pumping watts of power through that connection.

The small loop's bandwidth is so narrow that you don't even have to tune in a signal to check for resonance -- when it is off frequency, you won't even get static; so just tune for maximum static at the desired frequency, and when there is a signal there, you'll get that as well.

The reason you don't see a lot of discussion about how to tune your pickup coil is because the coil becomes part of what affects the antenna's impedance; so however you connect it, if you tune for maximum signal, you'll already have the best balance between resonance and impedance.

So my suggestion is to connect the loop any way you can to the coax, and then test it. If you are unsure you selected the best way, try other methods and see if the signal is stronger. More than likely, all methods that work at all will work well enough. You don't necessarily need a coupling loop.

Nor do you need to worry too much about matching the antenna to 50 ohms. Firstly, because SWR is not very important for receive performanceand secondly because on a cursory search it seems the RTL-SDR at least when modified for direct sampling doesn't have a 50 ohm input impedance anyway. The simplest connection method is simply to connect the shield to one end of the loop, and the center conductor to the other end.Using the same software configuration and the same RTL-SDR dongle, it is possible to add some extra components and receive ham radio and shortwave transmissions from around the world.

After the workshop on Saturday, members of the OSCAL team successfully reconstructed the SDR and antenna at the Debian info booth on Sunday and a wide range of shortwave and ham signals were detected:. There are numerous online calculators for measuring the amount of enamelled copper wire to cut. For example, for a centre frequency of Add an extra 24 cm extra 12 cm on each end for folding the wire through the hooks on the balun.

After cutting the wire, feed it through the egg insulators before attaching the wire to the balun. Measure the extra 12 cm at each end of the wire and wrap some tape around there to make it easy to identify in future. 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.

Insert the exposed ends of the wire into the screw terminals and screw it firmly into place. Avoid turning the screw too tightly or it may break or snap the wire. Try to keep it at least two meters from any structure. Maximizing the surface area of the loop improves the performance: a circle is an ideal shape, but a square or rectangle will work well too.

For optimal performance, if you imagine the loop is on a two-dimensional plane, the first couple of meters of feedline leaving the antenna should be on the plane too and at a right angle to the edge of the antenna.

Inspect the up-converter carefully. Look for the crystal and find the frequency written on the side of it. The frequency written on the specification sheet or web site may be wrong so looking at the crystal itself is the best way to be certain. On my Ham It Up, I found a crystal with On the Receiver options tab, change the Mode value. To start exploring the 20 meter amateur band around Zoom until the width of the display is about kHZ, for example, from Click the Play icon at the top left to start receiving.

You may hear white noise. If you hear nothing, check the computer's volume controls, move the Gain slider bottom right to the maximum position and then lower the Squelch value on the Receiver options tab until you hear the white noise or a transmission. Now that gqrx is running, it is time to adjust the knobs on the antenna tuner ATU. Reception improves dramatically when it is tuned correctly. When you find the best position, the signal strength displayed on the screen will appear to increase the animated white line should appear to move upwards and maybe some peaks will appear in the line.

At this point, if you are lucky, some transmissions may be visible on the gqrx screen. They will appear as darker colours in the waterfall chart. Try clicking on one of them, the vertical red line will jump to that position.

For a USB transmission, try to place the vertical red line at the left hand side of the signal. Try dragging the vertical red line or changing the frequency value at the top of the screen by Hz at a time until the station is tuned as well as possible. Try and listen to the transmission and identify the station.

Commercial shortwave broadcasts will usually identify themselves from time to time. Amateur transmissions will usually include a callsign spoken in the phonetic alphabet. You may want to note down the callsign, time, frequency and mode in your log book.If so, you can make a trial with the WBL antenna. The WBL covers from 0. The superior noise nulling signal boosting performence coming from the superbly directive element and the built-in low-noise preamplifier.

Both of these features will help to uncover the buried signals normally lost when using long wire antennas. The WBL comes with the following features:. For field or portable use, a tripod or a telescopic fishing pole is recommended. The antenna is powered through coax, so no external wiring is needed. Finally, plug the supplied micro-usb cable to the bias-Tee, and connect the other end to a USB power source, like cell phone charger or a power bank.

Only logged in customers who have purchased this product may leave a review. The WBL comes with the following features: A balanced loop for deep noise signal nulls Built-in high performance preamp for low signal amplification Light-weight and slim stainless steel mm OD wire loop Portable operation possibility — totally weighs only 0.

Additional information Weight 0. Reviews There are no reviews yet. Rated 5. Rated 4.During these challenging times, we guarantee we will work tirelessly to support you. We will continue to give you accurate and timely information throughout the crisis, and we will deliver on our mission — to help everyone in the world learn how to do anything — no matter what. Thank you to our community and to all of our readers who are working to aid others in this time of crisis, and to all of those who are making personal sacrifices for the good of their communities.

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Updated: August 11, References. Amateur Radio has been a supreme way of communications for many ways of getting messages from one place to another for decades! Many antennas have been invented simply by necessity.

Spark Gap Transmitters were used around the time of the great disaster of the Titanic. Wireless is what they called it back then, and still to this day, wire antennas are sending signals out on the airways.

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Amateur radio has progressed, and continually changed since the spark gap transmitters of that time. High voltage coils were used for their power, and it systematically sent out the familiar "dits" and "dahs" of Morse Code, and the party or parties, at the other end who could read Morse Code wrote the symbols down, and they made words.

A fantastic, and fascinating way of communication, and yet, it was primitive enough to look back on from this date, and say that was one fantastic communications tool. Log in Facebook Loading Google Loading Civic Loading No account yet?

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sdr loop antenna

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sdr loop antenna

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