110 Royalty-Free Audio Tracks for "Radio Frequency"

Qrm listened in am mode on 80 m band in my qth jn79ek. If i use cw mode listening and narrow filter, the qrm is mostly worse. Strength: peaks s9+40 db. Sometimes any traffic impossible. From -41st sec. Of record is possible to heard my tuning around frequency.

I like to listen to static (often actually) and it actually shifts a lot through out the day. So i heard some cool ringy stuff. . & decided to sweep through the am band. . . And actually touching the screen of my cell made the static louder. Sounds like a synth.

This sound is an audio file that slowly breaks up the further it is played. I recorded this with an in-built microphone, no idea what make though. I recorded this on audacity, and added gradual distortion. Warning: you may need to turn down the volume for the last 6 seconds!.

Shortwave wide-band digital emission recorded on july 15, 2014 at 15:17 utc in am mode using 2 instances of the online remote controllable short-wave receiver located at the amateur radio club etgd at the university of twente the netherlands. Left channel was recorded below the central frequency, at a frequency of 10187khz, right channel was recorded above the central frequency, at 10191khz. This was an experiment to see if selective fading would create stereo effects, as the lower frequency part of the transmission would be heard better in the left channel, and the higher frequency component would be heard better on the right. I used goldwave to put the separate recordings into 2 channels of the same file, after i synched the recordings by ear at 1/16 playback speed using a set of 2 particularly strong lightning static crashes as a guide, trimming off everything that came before the first strike in both original recordings, then inserting silence in the range of a few milliseconds until the stereo separation was as close to zero as i could get it. I wasn't as successful at that as i've been with experiments with voice recordings from simultaneous broadcasts on 2 wavelengths that i haven't posted here.

Two sennheiser g3 transmitters were set for the same frequency; one of them was transmitting a previous interference recording from my macbook p2 phone output, the other one had no input;the receptor was connected to loudspeakers; the interference would vary as i moved each transmitter around. I recorded the loudpeakers output through the macbook built-in microphone, on audacity. This is a specially noisy part i exported. Not a pretty sound, but may be useful.

This is the companion audio to the article "modify your monitor audio" appearing on w1zy's substack account. In it, we hear what happens when you mix through a soundboard the audio from a ham radio transmitter's "monitor" output and a second receiver dialed onto the transmitter's output frequency. When the two are mixed, we hear a heterodyning between the external receiver and the transmitter monitor audio sources. By adjusting the receiver's frequency to that of the transmitted signal, we can zero-beat the two audio sources together producing a "flange" effect derived from analog devices. Non-ham audio enthusiasts might find this clip interesting since it is producing this artifact not through some plug-in, but through use of "legacy" analog equipment.

Playing around with the excellent tuner at http://websdr. Ewi. Utwente. Nl:8901/. The website even has a recording button! this version is the same as "shortwave-sweep-and-beeps. Wav" except here i have limited it with a threshold of 10db, which decreases dynamic range but also makes it louder overall.

10119 khz 2011-oct-27-1400-utc station clicking over the band. Clicks noted in 10114-10123 khz range. His equipment was old czechoslovak army transmitter rs-41 (about 1965 year). Added frequency marks at -45, -27 and -10 sec. Of the record. I know that rs-41 is clicking because i have the same transmitter at home. But later found that also ft-897 receiver is often the source of phantom clicks. . .

Remix of wierd chimes. Wavhttp://freesound. Org/people/kwahmah_02/sounds/250253/which was a recording of a shortwave broadcast in am mode received in usb mode 1khz off frequency. I used goldwave's mechanize feature at 10000khz, then applied low pass filter at 10000 khz to filter out the newly created upper sideband, then i used mechanize again at 9000 khz, which tuned in the recording just like if i had a tuneable receiver.

Ringmodulated inversion of my speech from the file https://freesound. Org/people/kb7clx/sounds/648443/ invertedspeechcq. Wav. I took the raw recording and used goldwave's mechanize effect to translate my voice to a center frequency of 14khz. I then demodulated it first at 10. 6 and then 10. 2khz meaning that what comes out is essentially the opposite sideband, offset by 3. 4 and 3. 8khz respectively. 3khz just didn't sound as good. The first i filtered with a low pass of 2. 9khz, the second was filtered to below 3. 4khz to emulate a communications receiver passband. I am speaking upside down as described in this video. Https://www. Youtube. Com/watch?v=q_ykxzcbh-g beginning at 00:03:16. Being blind i can't see their diagram, but i've got my own by ear intuitive method, keeping in mind that oo and ee are farthest from each other, all other vowells get closer the closer they are to the middle of the human voice frequency range. I say: huhlay sue quee, sue quee, sue quee do ux. Cahlloong sue quee sue quee sue quee do ux. The ay in huhllay is like when a spanish speaker says béisbol (baseball). The a in cahlloong is like the a in cat if you're opening wide for the doctor. The oo is like the oo in book. Listen to the other file and you'll hear: hello cq cq cq dx. Calling cq cq cq dx.