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A Two-tone Oscillator
https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/pw/1989/05/page24/index.html
The two-tone tester has also found use within the radio shack as a general-purpose audio test oscillator. I wish you all the best with this construction project, and look forward to hearing your linear signal on the air.
A Simple Two Tone Oscillator - Internode
http://www.users.on.net/~endsodds/twotones.htm
A Simple Two Tone Oscillator: DOWNLOADS: This project was published in the September 2004 issue of the Australian magazine "Amateur Radio". The article text (Word 2000 format) A photo showing the SSB output of a transceiver with the …
Electro-Resales 2 Tone Audio Oscillator for SSB Tests
https://nebula.wsimg.com/0129e20e74ea775cc396f8c0be44694c?AccessKeyId=13A6205A294059260963&disposition=0&alloworigin=1
2 Tone Generator – D18 2-Tone Audio Oscillator for SSB Tests Background This 2 Tone generator has been designed to provide 2 non-harmonically related signals as an audio source for testing SSB transmitters and associated equipment. 2 Tone generators are most often used to measure transmission linearity (purity).
CWTD - Sep 17, 2013
https://www.cwtd.org/Sep17.html
Two-Tone Test Signals. When it comes to transmitter, amplifier or balanced modulator tests, you need a device generating two non-harmonically related frequencies in the audio band ... this equipment is known as a two-tone test oscillator.
ELECRAFT 2T-gen 2-Tone TEST OSCILLATOR
http://www.radiomanual.info/schemi/ACC_instrument/Elecraft_2T-gen_user.pdf
the associated oscillator. Placing a jumper block over the “T” pins, or removing it entirely, will turn on the associated oscillator. JP1 controls the 700 Hz oscillator and JP2 controls the 1900 Hz oscillator. Applications The 2T-gen has been designed to provide a 2-tone signal source for testing of SSB transceivers and associated amplifiers.
Online Tone Generator - Free, Simple and Easy to Use.
https://onlinetonegenerator.com/
Online Tone Generator. Free, Simple and Easy to Use. Simply enter your desired frequency and press play. You will hear a pure tone sine wave sampled at a rate of 44.1kHz. The tone will continue until the stop button is pushed. The tone generator can play four different waveforms: Sine, Square, Sawtooth and Triangle.
Oscilador telegráfico OT-1 Amateur-D Inctest Indústria de
https://www.radiomuseum.org/r/inctest_oscilador_telegrafico_ot_1.html
Audio oscillator for code practice . Tone and volume controls. Literature/Schematics (1) Manufacturer advertising; Author; Model page created by Antonio Rabitti. See "Data change" for further contributors. Other Models; Here you find 6 models, 6 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
Multi-tone audio testing? | Audio Science Review (ASR) …
https://www.audiosciencereview.com/forum/index.php?threads/multi-tone-audio-testing.12865/
1kHz single tone (note that TD+N in this case is the same as THD+N): TD+N = -115dB 11kHz single tone, and a zoomed-in version around the 11k tone to show the distortions there (jitter?). TD+N = -108dB CCIF 18.5k/19.5k two-tone signal: TD+N = -110dB 32-tone test signal: TD+N = -114dB 500-tone test signal: TD+N = -115dB
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