All Questions

Is it possible to generate signal using GRC and transmit it through USRP and collecting the output through CRO or spectrum analyzer or through signal hound SDR?..IF SO what are the blocks to be added

Here is how the FM Receiver I made using the GNU Radio Companion. (Basically, I was following this tutorial by VYE6Y on youtube.) FM Receiver Problem: Unfortunately for me, the GNU Radio gives no ...

I made a simple linear power supply for my transceiver using 12V 30A transformer, four diodes RHRP3060 forming a rectifier and three 30_000 µF capacitors connected in parallel. I also used a 200 Ω 50W ...

I'm considering buying a Yaesu FT-857D for car mount and I'm now concerned the speaker is on the body and only the body and not on the head unit. Where's the speaker? Can a mic contain the speaker ...

I recently watched, on You Tube, a NOVA program about the British school masters and students who were the first to publish the news that the Soviets had started launching satellites from a new launch ...

A superheterodyne AM receiver down converts the AM signal from its broadcast band to a fixed intermediate frequency(IF) band where amplification takes place. The IF centered at 455KHZ What is the ...

In analog-to-digital conversion, how independent is the Nyquist rate from the power of the signal?

I understand that in a half-wave center-fed antenna current distribution has a sinusoidal wave approximately, so the current in the center has max value and it has to become zero at the ends of dipole ...

Here is my schema. I would like to connect a device using SMA connector with RG 174 to an attenuator of 30 dBm with SMA connector. On the other side the attenuator is connected to a SMA-UHF converter ...

I have a chance to get a 1 kW amplifier with a 220V plug dirt cheap from a friend of mine, but I only have a 110 outlet. The 110 outlet is on its very own 20A breaker with no other outlets. Could I ...

Video I was experimenting with different settings on my IC-7300 and trying out manually controlling the RF Gain with AGC off. Too much gain for a moment caused audio clipping followed by the audio ...

The answers to this question explain why it's difficult to transfer power from a transmitter to an antenna that is λ/2 in length (or a multiple for long wires, or as half a dipole's length). Are ...

I want to connect two devices via coaxial cable that normally use radio frequencies to communicate. The transmitting device uses a transmission power of 5 dBm to 15 dBm (i.e. 3 mW to 30 mW) to ...

I'm an Amateur Radio enthusiast from way back; mostly CB and 10 meters. I have a couple of hand-held Baofengs that I want to use for family communications and as a backup link in case of emergencies. ...

I have a Nanostation router that is part of a mesh, and a wifi router connected to it, which I can get to http://localnode.local.mesh:8080/cgi-bin/mesh now that I ...

My apt balcony is 1,812 feet exactly from my campus's Wifi access point behind a triple pane, brick, 4th floor building window. There is a clear line of sight. I was interested in seeing if I could ...

I'm looking for a reliable, however cheap solution for ground-space communication. I need at least 50W of transmitted power with 2GFSK modulation at 70cm band (433 MHz). Transmission will be done ...

Numerous sources say that LW length shouldn't be a multiple of λ/2 for any frequency in interest. This will cause the antenna to have a high impedance at this frequency. Since the coax cable impedance ...

I am currently studying for my Technician Exam and I am amazed at the sheer number of amateur radio satellites in orbit. Knowing how expensive it is to launch something into space, and assuming there ...

I've recently purchased a Hallicrafters S-120 -- 4-tube superhet receiver from the 1960s, continuous tuning from 540 kHz to 30 MHz, bandspread control, and a regenerative IF that doubles as a BFO for ...

I went to the ARRL's band plan site at https://clatsopauxcomm.org/index.php/technical/arrl-band-plan, and the first table began with the 60-metre band, which starts at 1.8MHz and ends at 2.0MHz. ...

I have a new interest in RF modulation and read the O'Reilly book electronics cookbook. I understand that in FM you start out with a carrier wave and then it is modulated but I don't understand if ...

I got 2 Baofeng 888s off Amazon and reprogrammed them to the 16 legal channels (for unlicensed use) in Germany, up from 446.00625 MHz in 12.5 kHz steps. I used both CHIRP and a software called ZT-V68 ...

I have a radio that does not support VOX, but then I got the idea that there might be a VOX mic that sends the PTT when VOX is activated? Basically a mic that will "push" the button for me. Does that ...

Apparently there's a parking lot in which car key fobs are messing up: Key fobs that suddenly won't unlock vehicles. Cars that won't start. Alarms that go off for no reason and can't be quieted. ...

I've wondered if many of the abbreviations are empty, or if they are similar to the recursive acronym like PHP and GNU. For instance, I learned that CQ mimics the two syllables of a French word for ...

I know that repeaters on VHF and UHF are primarily automatic, but there will be times when they will fail, or something is not working. The repeater may not respond to the remote control. In these ...

From online directions, I made a MURS antenna. The 1:1 SWR is at 142.000 and I want to tune it for 146.500 (therebouts). I know I need to shorten this antenna. I would like to confirm that I do NOT ...

Just researching an outdoor long run shortwave antenna. I found some cheap wire online but it said it is resistant to corona discharge: Will satisfy a wide number of applications related to medical,...

From a comment on How can I protect equipment against a lightning strike? Most of the damage from nearby strikes comes from strong voltage gradients over the ground or between the ground and ...

Using a Raspberry Pi 3B, Signalink, HT, direwolf and ax25-tools and ax15-apps. All up to date. Clean start. Commands: ...

For a yagi antenna, for transmit, does the waveform traveling away from the driven element towards the reflector get cancelled out by the reflector and then simply disappear ? Or is that cancelled ...

I want to build a generic multi-antenna switch using relays. Many projects on the web have done this but the relays have silver contacts. This would be fine if I were to transmit to all antennas so ...

I've recently come into possession of a Yaesu FT-1DR, and one of the first things I noticed is that it has a bluetooth icon on the screen! Turn up the contrast and look carefully at the line of icons.....

I've grown up using SWR/power meters. They're "simple" devices: They show forward and reverse power, and show the standing wave ratio. They, however, do not show antenna efficiency. New hams are ...

I have read that radio waves just keep travel but the signal gets weaker because of how the wave spreads. Ok i get this but what confuses me is that satellites emit signals from space that our phones ...

There are videos on YouTube that show how to make a 1:1 current balun. When the balun is done some people connect a 100W 50 Ohms resistor to the balun and measure SWR say in 7.000-7.200 MHz range. If ...

Will the quantization noise be increased if the step level is increased? I was wondering about the relationship between the step size of the quantizer and quantization noise,

I've recently had an MRI, and after studying chapter two and three of the ARRL manual, I've got a better understanding of how my MRI machine might have worked. Now, I am curious to know what would ...

I have a 25w radio running through a ~4.5db gain antenna. If I use a 4W HT indoors, I can hear a loud buzzing noise emmanating from my computer speakers. If I used the 25w mobile with the 4.5db gain ...

I understand the idea that when we are targeting the electrical component of the radio waves we need to have some form of a linear conductor that receives the electrical component, this creates a ...

One explanation I found is that a signal reflected from ionosphere is always circularly polarized. Thus it can be received by both vertically and horizontally polarized antennas (naturally, with 3 dB ...

I am interested to explore what a Yaesu VX-8DR radio can do and would like to add an amplifier to it. One of the AMPs that seems to work with a 5W input is KPA100, I am still doubtful how the Yaesu ...

My answer to the question Where can I find the TLE of ExseedSat 1, India's first ever private LEO satellite? is currently that while 60+ objects are being tracked from this mutli-payload launch, ...

CD-audio has a bandwidth of 22kHz. CW usually has a bandwidth between 3 to 5 kHz. But I am wondering what is the bandwidth my Icom IC-910H can listen to in both, the SSB and the FM mode? Also, what ...

Is it possible, and how can I setup communication between stations 1000km apart from each other by using just 1W of transmission power? By communication, I mean: It can be text based It can be very ...

In Russia hams use two phonetic alphabets - the regular one (Alpha, Beta, Charlie, ...) and a localized one (Анна, Борис, Цапля, ...). When a ham calls CQ in Russian (which by the way is pronounced ...

AM broadcast signal covering 995-1005 kHz radio frequency (RF) range is to be down-converted to an intermediate frequency (IF) range of 395-405 kHz where main amplification takes place in AM receivers....

Task: Path loss modelling Target frequency: 433 MHz; Laboratory environment: in a basement where there were other equipment and metal shelves. A few acoustic absorbers were placed around the setup. ...

A direct current will be interrupted by a high frequency switch. It seems , that in a wire, connected to the source (the antenna rod), instead of pushed back- and forwards electrons, the electrons get ...