Written by myself, for myself, using Borland Delphi. I hope it may be of use to you, but please understand I can take no responsibility for any errors arising.
Audio Level Meters
Audio Level Meter Audio Level Meter
Dual PPM
Analogue PPM
Meter + Audio Generator
Wide Range
Level Meter
Applause Meter or ‘Clap O’meter’
Applause Meter
Customisable full-screen Applause Meter or 'Clap-o-meter'
Image Cropper
Image Cropper
An easy-to-use utility for cropping jpeg and bitmaps image to a selected aspect ratio.
Many other features
R's 'R Us
Any Resistor You Want
Make any resistor value from two preferred values
Audio Level Meter Test Generator Wide Range Meter
Audio Tone Generator
Digital Level Meters
Multi-Channel Level Meters Multi-Channel Level Meters
Multi-Channel Level Meters
Digital or Analogue style Level Meters
From 1 to 24 channels in 1 to 4 rows
LevelLogger
DBview graphical level meter
Shows audio level in a graphical form with peaks and average readings
Knight RiderVoice Meter
Software for Windows by Paul Marshall
© Paul Marshall 2003
There are plenty of ways a smartphone could be useful on air. Playing recorded audio, voice clips or music, for instance. How about using a SIP client as a codec? Or Skype? And of course, putting callers on the air. If only there was a professional bidirectional audio interface for cell phones…
Problem solved. The Bluetooth Audio Gadget makes it easy to put a smartphone on the air. Just pair your phone, and the Bluetooth Audio Gadget automatically negotiates the optimal codec algorithm (usually APT-X for Android, AAC for iPhone). Balanced audio I/O connects the Gadget to your console. The sound quality is amazing. And the Bluetooth Audio Gadget is bi-directional, so you can even send mix-minus to your caller.
Like all Angry Audio products, the Bluetooth Audio Gadget is built-for-broadcast with premium components like an all steel enclosure, internal AC power supply, and gold-plated audio connectors and switch contacts. Place it on your desktop, or mount it in your rack with our rackmount kit.
Order your Bluetooth Audio Gadget today. Your talent will call and thank you.
But first of all, why 50, or any other number? The answer can be shown in the graph below. This was produced by two researchers, Lloyd Espenscheid and Herman Affel, working for Bell Labs in 1929.
They were going to send RF signals (4 MHz) for hundred of miles carrying a thousand telephone calls. They needed a cable that would carry high voltage and high power. In the graph below, you can see the ideal rating for each. For high voltage, the perfect impedance is 60 ohms. For high power, the perfect impedance is 30 ohms.
This means, clearly, that there is NO perfect impedance to do both. What they ended up with was a compromise number, and that number was 50 ohms.
Impedance in Ohms
You will note that 50 ohms is closer to 60 than it is to 30, and that is because voltage is the factor that will kill your cable. Just ask any transmitter engineer. They talk about VSWR, voltage standing wave ratio, all the time. If their coax blows up, it is voltage that is the culprit.
So why not 60 ohms? Just look at the power handling at 60 ohms - below 50%. It is horrible! At the compromise value of 50 ohms, the power has improved a little. So 50 ohm cables are intended to be used to carry power and voltage, like the output of a transmitter. If you have a small signal, like video, or receive antenna signals, the graph above shows that the lowest loss or attenuation is 75 ohms.
Of course, you're going to say that two wires insulated from each other cannot possible be in the same place, right? Wrong! And the way to get two wires in the same place is to start with four wires spiraled together, as shown in the image below.
Blog20_How_Starquad_Works_Quad_Cross-section
If you combine the wires across from each other, you end up with a pair.
Blog20_How_Starquad_Works_Conductors_Combined
But look at that first picture of the inside of the cable and think about the electromagnetic noise. By combining the wires, you really do have the two conductors inside each other. Even if you don't believe it, the proof is in what this amazing design can do. For instance, one of the worst noise offenders is 60 Hz power (50 Hz for much of the world).
There is no shield of any kind that we can apply to a cable that has any effect on that low frequency. Even a solid steel conduit, perfectly installed, is only around 30 dB of noise rejection at 60 Hz. But starquad cable is up to 50 dB noise rejection at 60 Hz.
If I were running mic lines near power cables, I definitely would think about starquad! If I was hanging audience microphone from a lighting grid, I definitely would think about starquad.
Belden makes three sizes: Belden 1192A, full size, Belden 1172A small size, and Belden 1804A miniature. The full size is standard mic cable size. The smaller one is excellent for wiring mic booms, or places with restricted space. The miniature is like lavaliere cable.
Do you know the difference between a balanced line and an unbalanced line? If we're talking about analog audio, this difference between balanced and unbalanced is also the difference between consumer products, which are almost always unbalanced, and professional, which is almost always balanced. To go into the details of these differences would take a number of blogs, so I'm going to try and condense it here.
Balanced lines are a system that puts the audio signal on two wires. You do this by feeding the line and picking up the signal at the other end with an audio transformer. These days you can use a real wound coil of wire transformer or you can use a circuit that mimics that transformer, something called active balancing. The person who really put these active balanced circuits on the map was Greg Mackie while at Tapco, and at the company that followed, Mackie.
The reason that Mackie and many other similar companies can offer you a decent mixer for very little money is active balancing. Compared to a circuit or to a chip or two, real wound transformers are expensive and heavy, especially if their performance is any good. They are hard to make and a really good single wire-wound transformer can cost as much as a whole Mackie mixer. On the other hand, there have been lots of improvements in chip design over the years from folks like T.H.A.T. and their InGenius 1200, or the LMV831 family of chips from National Semiconductor. These chips are getting closer and closer to wire-wound real transformer performance and at a fraction of the cost.
The real secret is that a balanced line will reject electromagnetic noise (EMI, RFI) but allow the audio signal to go through. It will also reject noise from the pairs around it, like in a multi-pair snake cable or even from 50Hz or 60Hz power wiring. You absolutely must use balanced lines, if you are running any audio near lighting or power wiring.
Professional video connectors are crimped. But there's one professional connector that is still soldered, the venerable XLR. It has become the universal standard for audio wiring. It is made by many manufacturers including Neutrik, Switchcraft, Amphenol and many others. You can even find some made by ITT Canon, who invented the connector in the early 1950s. And now Belden is working on a video to show you how to solder a mic cable (or a line-level cable) into this connector and will post it as soon as it's available.
BackUPS is a power controller for ensuring reliable AC power to critical equipment that is powered with an Uninterruptible Power Supply (UPS). BackUPS constantly monitors the output of the UPS, and automatically bypasses the UPS if its output fails or becomes unstable. BackUPS has two AC inputs: LINE and UPS. Line is plugged directly into a local AC socket;
UPS is connected to the output of the UPS. If BackUPS senses that there is any interruption in the UPS output, it switches to Line, bypassing the UPS entirely. This keeps the load powered-up, and allows the UPS to be disconnected for battery replacement or other maintenance.
BackUPS includes a Delay timer that ensures the UPS output is stable before the UPS is switched online. Whenever the UPS output comes on, the system monitors its output for a preset time period. The UPS will be switched online only if the UPS output is stable
HNR(Happyday Newage Radio)'s new site is Coming Soon!
홈페이지 공사중입니다. 라디오와 소셜은 정상적으로 서비스 중입니다.
HNR's radio & social services are normally available.
RADIO
(Apple & Winamp) http://iNewAge.com/listen.pls
(Apple & SHOUTcast) http://iNewAge.com/listen.m3u
(Microsoft) http://iNewAge.com/listen.asx
(Microsoft) http://iNewAge.com/listen.wmx
(RealNetworks) http://iNewAge.com/listen.ram
(RealNetworks) http://iNewAge.com/listen.smil
(Other url direct input) http://newage.kr:8000/ 8888 8060 8080
© 2003-2020 HNR - iNewAge.com iNewAge.net All Rights Reserved.
The most frequent sounds heard on WWV and WWVH are the seconds pulses. These pulses are heard every second except on the 29th and 59th seconds of each minute. The first pulse of each hour is an 800 ms pulse of 1500 Hz. The first pulse of each minute is an 800 ms pulse of 1000 Hz at WWV and 1200 Hz at WWVH. The remaining seconds pulses are short audio bursts (5 ms pulses of 1000 Hz at WWV and 1200 Hz at WWVH) that sound like the ticking of a clock. //
Both WWV and WWVH broadcast standard frequency audio tones that alternate during most minutes of the hour. Most minutes feature a 500 or 600 Hz audio tone. However, a 440 Hz tone is broadcast once per hour, and some minutes do not include any audio tones at all.
Just a few decades ago, getting into hobby radio meant lots of specialty hardware, and making changes to your setup to work on various frequencies wasn’t particularly easy. Since software-def…
PCIMAX3000+ is a computer card that will change the way you either do radio or listen to your MP3's or other audio via PC. It will effectively change your PC into a powerfull broadcast worthy stereo FM radio station, it is a small digital FM transmitter in a form of a PC card. You will be able to play your audio files (CD, wav, MP3, real audio etc.) from your PC through radio waves directly to your household radio receiver in the next room, in the living room, across your yard, in whole block of flats....or for the entire village/small city. You need just an ordinary radio receiver to receive your signal. The included software lets you set the frequency and the output power.
In a remote forest, a few kilometres from the Chernobyl power plant, the huge Duga-2 radar tower stands as relic of Soviet mismanagement.
Video by Adrian Hartrick and Dominika Ozynska
International Bulletin of Missionary Research
Vol. 36, No. 4
October 2012
pp. 200–204
Radio Missions: Station ELWA in West Africa
Timothy Stoneman
Wi-Fi is like real estate—the secret is location, location, location.
Dream is a software implementation of a Digital Radio Mondiale (DRM) receiver. With Dream, DRM broadcasts can be received with a modified analog receiver (SW, MW, LW) and a PC with a sound card.
utorial: How to Receive and Decode DRM Signals
To receive DRM with RTL-SDR, you will need the following:
- An RTL-SDR dongle working with SDR#. (Or a more advanced SDR such an Airspy)
- An HF upconverter such as the recommended SpyVerter or ham-it-up, or a dongle modded for direct sampling (such as our already modded V3 dongle), or SDR# modded to use the experimental Oliver Jowett HF driver for regular RTL-SDR dongles.
- The DREAM DRM decoding software with AAC decoder.
- Virtual Audio Cable or VB-Cable.
WiNRADiO Communications manufacture radio communications equipment for a very wide range of applications. Our customers include professional communications radio users in government, industry, military, security, surveillance and spectrum monitoring organizations, as well as many radio and computer enthusiasts.
NEW! The immensely popular DRM Software Radio is now available in three different versions (general purpose, and supporting two WiNRADiO receiver models), and can now be purchased directly on-line via WiNRADiO Communications.
The DRM Software Radio is based on the proven Fraunhofer DRM engine, which is considered to be the most advanced DRM engine today, built around fully licensed proprietary DRM encoding technology.
Now, if you focus your eye at dead centre of the picture you will see that the voltage is always zero volts. This is because a dipole is optimally driven with a balanced voltage source (VOVO). A balanced voltage source is preferred for a dipole antenna. In fact, the voltage and electric field is zero all along the length of the green line below: -
This means you can optionally regard that green line as earth (providing the antenna is driven in a balanced way). Now if you were to cut the above picture in half you'd have a 1/4 λλ monopole driven with an unbalanced voltage source. An unbalanced voltage source is one that has typically 0 volts on one leg while the other leg does the voltage driving: -
And, not surprisingly, it has one half of the impedance presented by the half wave dipole. But, to keep the same radiation pattern you need to "force" an earth plane that does what the green line does.