Questions tagged [receiver]

Use this tag for questions about the theory and structure of receivers.

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votes
1answer
776 views

2-Pin Kenwood to Sound Card (Beofeng UV-82HP & ASUS Xonar Essence STX)

I have a Baofeng UV-82HP that I want to use to TX and RX to a TeamSpeak Server. For this I'm going to use a dedicated computer, for both the client and server that has a sound card (ASUS Xonar Essence ...
2
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1answer
420 views

VHF antenna / receiver suggestion for a UAV

I am currently working on a student project that involves having a UAV fly an orthogonal path over a series of transmitters -- taking in data (through an arduino-based system for data processing). ...
6
votes
2answers
120 views

Apps and or equipment needed to document local interference?

A neighbor ham user recently started doing something that causes very noticeable feedback/buzzing in AM radio as well as any device that uses a wired microphone (such as a gopro with wired mic). ...
3
votes
1answer
154 views

FFT frequency shift corrupting phase

I have written a Software Defined Radio. I take I/Q audio into the computer at a 192K sample rate and perform a 4096 sample Complex FFT. I display the spectrum (PSD) to the user so they can pick the ...
3
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5answers
848 views

“Local oscillator generates a frequency twice lower than received signals”. Why and how does it work?

I would like to construct the following receiver: I have a fair knowledge about a receiver building blocks. I have previously build small receivers. In the description it say: The local ...
3
votes
1answer
644 views

Receive antenna design for a small apartment

I am looking to make a simple receive antenna from some wire, and I have some questions about resonance. Being that this wire can only be so long (about 3 meters maximum, as it must fit inside my ...
20
votes
8answers
41k views

How can I avoid accidentally transmitting with a Baofeng UV-5R?

I don't have $500 for a radio scanner. If I know the few (analog) frequencies that I would like to listen to, I think one can use the Baofeng UV5R (which doesn't cost much). The only problem is that ...
8
votes
2answers
11k views

Connect two receiving antennas to the same radio

I have built a 1090 MHz ADS-B antenna roughly following some video instructions. It appears to work reasonably. However, because of how it is placed, it captures signals for more or less a half of ...
2
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1answer
167 views

FSK real world application BER

I have designed a receiver for FSK reception in 434 MHz ISM band. For this I used USRP1 and GNU Radio. Now, I would like to measure performances of my receiver. For this purposes I did following: I ...
3
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5answers
536 views

Crystal set as wireless earphone

Reading about a 'necklace' coil inducing a strong alternating audio current (using an LM386 f.i.) into a magnet inserted in the ear canal set me thinking. The problem is that the magnet has to be ...
7
votes
1answer
3k views

How is the FM-signal demodulated in my receiver?

I've built a radio receiver and I'm wondering how the demodulation works here. I think it's done by T1 and T2 (I've used BC547 instead of BF494, they're quite similar), but I'd like to know more about ...
1
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2answers
252 views

How difficult is it to build a basic transmitter and receiver

Preferably something that could transmit LED lights, like patterns. After that I'd like to advance to audio and video. But for the basic radio transmitting and receiving how difficult of a job would ...
3
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3answers
2k views

How to receive a signal from multiple sources simultaneously (helical antenna)

I'm working on a system (theoretical at the moment) whereby I wish to receive data from multiple sources all transmitting at the same time. I've read that a helical antenna is capable of this. I'm ...
2
votes
2answers
198 views

How much EMF does a typical scanner put out?

I am not terribly interested in hearing about whether or not EMF/RF is hazardous to ones health (as this is frequently discussed in my house). What I would like to know is; how much EMF/RF does an ...
4
votes
1answer
792 views

How to make an inductor?

I am a high school student and am making a project on FM receiver for class 11. I am following this circuit diagram: The L2 in this diagram is a 22µH RF Choke. The part listed in the website has the ...
7
votes
2answers
321 views

Center frequency spike on software radio for mismatched/disconnected antenna

A while ago I was using a software radio receiver to perform some antenna analysis. I left the spectrum display on while disconnecting the cable and noticed that when the cable was disconnected I ...
1
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1answer
289 views

Can the IC-R6 scanner receive NFM

I am considering purchasing the Icom IC-R6. One of the determining factors, and my questions is, can it can receive FMN (I believe that is narrowband FM)?
1
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2answers
8k views

What is DMR and can I listen to it?

I saw here Table of broadcasting stations that there is a mode called DMR (under Atlanta Technical College). What is DMR and if I buy a scanner (I am thinking about the Icom IC-R6) could I listen to ...
2
votes
2answers
93 views

How does a scanner work [duplicate]

I was reading What is the difference between radio scanner and receiver? and I saw that it said that the scanner continues on scanning after a radio transmission is over. If I find a frequency that I ...
4
votes
1answer
4k views

Can I improve reception with a more sensitive antenna / preamplifier / better feedline?

I am trying to receive a station, but I can only barely hear it through the noise. Will doing anything that increases the signal from my antenna help, such as: using a more sensitive antenna adding a ...
3
votes
1answer
604 views

Idea for better reception in crowded city

I am living in crowed area of a city. It is impossible for me to set up an antenna outside the apartment. I receive signal inside the room. I have a funcube dongle pro+ and some RTLSDR, the picture ...
3
votes
2answers
1k views

2m Homebrew Receiver - Chip for frequency [closed]

I am a new HAM trying to design a small, cheap 2m receiver. I've been looking up different circuits and homebrew tutorials, but the closest I seem to find to what I'm looking for seems to always use ...
1
vote
2answers
2k views

Is there a way to find out the location where a radio signal is intercepted?

I am a software engineer and a noob to radio. Is there a way to find out the location where a radio signal is intercepted? That is, the location where somebody is eavesdropping on my wireless ...
2
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3answers
1k views

Are there legal restrictions on radio reception in India?

I live in India and would like to know whether it is legal to listen to on the air transmissions there. I know that transmitting is allowed only in limited frequencies and strictly require a HAM ...
2
votes
2answers
134 views

How can I listen to channels above 1710kHz?

I hear of channels at, for instance, 4625kHz and I want to check them out but the only radio I have is the one in my car which only goes up to 1710kHz. What kind of radio do I need to listen to ...
4
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3answers
1k views

SSB demodulation

I was building the superhet receiver for ham radio. But I seem to have got stuck at the demodulation stage. As an example: Suppose the person is transmitting SSB signal (20m band) at 14.250 MHz ...
6
votes
1answer
632 views

Doppler Shift Compensation in Inter Satellite Communication

I am currently doing a project in the area of optical inter-satellite communication (GEO-LEO). I am using a optical carrier of 281 THz, and the Doppler shift corresponding to it is ±7 GHz. I ...
12
votes
3answers
4k views

Share antenna between receiver and transceiver?

I recently put up a fan dipole for 80/40/20/10. I'm looking for a way to share this antenna with a receive-only SDR and my shack transceiver. Obviously I can just switch this antenna between the two ...
5
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1answer
2k views

What is the difference between a scanner and a receiver?

What is the difference between a scanner and a receiver?
13
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1answer
2k views

How would a time-difference-of-arrival receiver with two antennas know which side the signal is from?

An easy TDOA design by Byonics was published with the following schematic: It appears that the antennas are switched at a rate of 640Hz, which allows a 640Hz tone to be heard in the radio when the ...
-2
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1answer
121 views

multiband mimo ad-hoc wireless connections from different spectrums [closed]

I'd like to create a multiband MIMO ad-hoc wireless network. Can I turn on every GPS, WIFI and Bluetooth radio of a mobile device and synchronize data transfers at extreme speeds between a small, ...
7
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1answer
266 views

Regenerative receiver interference?

Can a regenerative shortwave receiver (especially an old vintage unshielded tube or transistor model) connected to a wire antenna generate HF interference? If so, what are some ways to prevent one ...
10
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2answers
789 views

What is meant by “poles” when discussing filters?

I was looking over the product page for the K3 (dreaming I know) and noticed that they offer a variety of crystal filters. Some are 5-pole and some are 8-pole, other than price, what is the ...
5
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2answers
1k views

Low parts count CW HF receiver?

I'd like to be able to provide my kids with the opportunity to build something a little better than a passive crystal set, but still very, very simple in terms of individual electronic parts count. ...
2
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2answers
2k views

Simplest, smallest antenna for tuning WWV, WWVH?

I'd like to perform some simple receiver testing and calibration (mostly for frequency variance, not signal strength) and have been told WWV/WWVH transmissions can be found throughout most of the US. ...
5
votes
3answers
3k views

Are there any good, consistently receivable signals in the US for HF receiver testing?

Having built my first HF receiver, I'd like to know if I'll need to search around for transmissions that happen to be occurring, or if there are reasonably strong signals I can count on being present ...
3
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3answers
4k views

What effect will placing two receiving antennas next to one another be on the received signals

I'm planning on using 2 receivers that operate on the same frequency. So there's no confusion I'm talking about WiFi signals (but I'm trying to do some cool amateur radio stuff with it!) so the ...
5
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5answers
2k views

Simple DIY AM receiver for 25/28 MHz

I'd like to build a simple AM receiver for 25 and/or 28 MHz to receive DCF77-formatted time code. It doesn't have to be extremely sensitive or selective - the local clock oscillator will keep time ...
2
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0answers
555 views

The knob on rabbit ears [closed]

So I was reading some fiction about where the character bought a television and "and the fanciest pair of rabbit ears available. The rabbit ears even had a large tuner knob built in to it that I'm ...
9
votes
4answers
208 views

Are there ways for people with receivers to participate in contests?

At the moment I only have an HF receiver (or I will when I build it, hopefully soon). Are there any contests I can participate in, or ways for me to participate in a contest without borrowing a ...
6
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1answer
253 views

Optically clear RF shielding?

Is there a material suitable for use as RF shielding that would allow at least 50% light transmission in the visible range? Thinking about a sensitive light receiver.
4
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1answer
2k views

What advantages does dual-conversion have over single-conversion superheterodyne?

I've seen a variety of radio block diagrams, and some have two mixers inline with the signal. If the signal is already in a frequency range suitable to work with, what does the second conversion/...
2
votes
1answer
2k views

Homebrew 20M SSB receiver design? [closed]

I'm looking for as simple as possible homebrew 20M SSB receiver design. I just want to start listening, but at the same time learn some radio fundamentals. So rather than buying a shortwave receiver ...
23
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1answer
5k views

Is there a way to listen to live HF communications using the internet?

I'd like to be able to show people what a QSO sounds like without having my transceiver available. Is there a way I can listen to amateurs talking in real-time (or using Morse code) on the HF bands ...
6
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4answers
4k views

Can I listen to hams on a standard AM/FM broadcast receiver?

I am very much out of practice with amateur radio (like many others), so to some, this question may seem obvious. I don't have any specialised amateur radio equipment, but I do have a Sanyo AM/FM ...

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