Old friend, when you were adjusting the radio, did you ever learn how to imitate a donkey's bray?
As you know, since the advent of voice communication, donkey braying and whistling have long been the most trusted debugging tools for operators worldwide, even though they were never included in textbooks.
A deep, resonant "hee-haw" from a donkey, full of harmonics and rich tones, accompanied by the heartfelt anticipation of an old friend… transcending culture, language, and even vast distances, it spread instantly across the globe. It demonstrated the brilliance of Maxwell, amplifiers, standing wave oscillators, and single-sideband modulation technology, all now coalesced within the dusty, aged radio's painted casing. No, not in the radio itself, but in the greasy hand of a large uncle pressing the PTT button. The uncle was likely frowning, staring intently at the various gauges on the panel, his mind filled with memories of a previous transmission, where common-mode current had briefly disrupted his thoughts.
At this moment, everyone who heard the sound of the donkey would smile knowingly, then raise their eyebrows slightly and stand up the furthest ear from the speaker. They would make a bet with ten thousand unintentional and one hundred and first curious thoughts: "It must be someone I know calling in," or "Who is making such a big deal today?"
Let me be clear: I'm being serious. A true veteran radio enthusiast isn't afraid to learn how to mimic a donkey, but they are only concerned if no one understands why you would want to do so. Sometimes, a simple donkey call can be more sincere than even a sophisticated dual-pointer oscilloscope. This is because it represents a level of experience that is beyond words – a kind of pragmatic philosophy rooted in engineering.
Recently, at the request of relevant authorities, I received a technician who came to my home for inspection. There was an intermediate step that required measuring stray emissions. The technician connected a sophisticated spectrum analyzer to my radio, and then connected a dummy load to the other end, before politely gesturing for me to… mute the PTT.
My equipment is functioning normally, but the people are tense. When I turned off the PTT, there was nothing on the spectrum analyzer. After repeating this several times, I suddenly realized: it's a single-sideband transmission, and only the carrier frequency is present.
I quickly ran through a series of solutions in my mind: learn to bray like a donkey? No… blow a whistle? No… play "Harvest Drums and Cymbals"... What am I, trying to scare people?! Would I actually do that in front of law enforcement officers??! At that moment, I really wished there was an audio signal generator.
Therefore, I created this little program: a donkey bray generator.
It's not a high-precision debugging instrument, but it's a "serious radio tuning tool" that can help you measure whether there are any unwanted signals (bleed), the strength of the rearward nasal tone, and whether the AGC is keeping up. It can also check if the PLL is stable. This covers most of the common cases encountered by experienced radio technicians in their daily practice.
If your needs extend beyond simply "making a donkey bray," you might be interested in the "ARRL dual-tone" signals inside. There are also several emergency kits specifically designed for experienced amateur radio operators: pulse, scan, shake, drift, and chirp.
If you're setting up a portable antenna outdoors, I can also add a "anti-motion sickness" feature for you. Hmm... now that I think about it, with the Dragon Boat Festival coming up soon, should we add a "mosquito repellent" frequency in the next version? What other frequencies would you like to have? Please let me know in the comments.
In reality, whether or not you learn to imitate donkey sounds is unimportant; what's important is whether you have ever seriously tuned a vintage radio. Of course, you can continue learning donkey sounds. However, if next time you find yourself facing a "very serious debugging" and are hesitant to learn donkey sounds, you could try this instead: a donkey sound generator.
One of the most romantic things in the world is when someone, far away, understands your donkey's bleating.
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