ATS-20 Si4732 All Band Radio Receiver Portable FM MW SW SSB Fullband Radio Receiver,Aluminum Alloy Case Shortwave Radio Receiver with Speaker,Antenna

Excelente recepción, la batería dura bastante, de buen tamaño y se ve resistenteNo traía Manuel pero es fácil de entender como funciona y no tiene indicador de la carga de la batería

Amazing design, good sound quality, sensitivity seemed to compare well against a Grundig Yacht Boy 200. Sometimes hangs on a screen showing "Arduino Library" and some numbers. Usually starts okay.PROBLEMS:1. NO OPERATING INSTRUCTIONS: it's a voyage of discovery to use the thing.2. Can't figure out the logic for band changes. Same button sequence has different results from time to time.3. TAP the buttons, don't push them.4. The little whip antenna supplied is useful, but not for AM broadcast band. Great for FM, so-so for SW.The BFO has a good range of adjustment and the signals are stable. Tuning SSB is a bit tricky, there's a learning curve. It would help to have instructions!In fact, the 3 star rating is entirely due to the lack of a user guide. There was nothing in the box except the unit, a charging cord and the BNC mounted whip antenna. The charging cord uses MINI-USB, which makes me wonder just how old the design actually is.Still, it's an amazing little box - Just wish I could find out more about how to drive it!

Works well with a good antenna (AM loop or other external antenna). Included rod antenna ok for local AM/FM. Display is not bright and will wash out in direct sun. This radio is good for 'DX-ing' AM and shortwave. Audio is reasonably good with internal speaker. Bandwidth filters for AM and shortwave are effective. SSB reception of ham bands is good. The labels on the pushbuttons are not absolutely in sync with their actual functions (a function of firmware updates). All in all a nice listening experience.

UFM on this radio is fantastic. The problem is it stopped working after 3 days. I have it on 100 ft long wire with a switch my other radios pick up stations all over the world. This one will pick up three or four at best. The volume is great the price is very reasonable but it's not much more than a toy

This radio has a step function that doesn't work. It should be able to tune at 100khz, 10khz, etc but only is set for 1khz. This makes it very slow to go from the top of the band to the bottom. Look at youtube videos before buying. It's okay but not as advertised.

I bought this to experiment with, because I knew it used an Arduino Nano to control the Si4732-A10 all-in-one radio chip. Look up PC2CLR SI4735 on github, the source code for this is under examples/SI47XX_KITS, look for the "Chinese" one that is all-in-one with OLED and RDS, since that is exactly the code this radio comes with. I was a little concerned about reflashing the firmware on something I just bought, but the directions given by Peter Marks (google "marxy ATS-20") made it foolproof. If you are an Arduino-head, you'll have no trouble hacking the heck out of this thing. I've had it for two days, and I've already made about a dozen "improvements" to it. Just don't expect it to behave like a full-on software-defined radio. It IS an SDR, but I could not find any help on hacking the DSP in the radio chip itself.As far as how it is right out of the box, it's about as good as most inexpensive AM/FM/SW radios, and better than most, since it includes single-sideband mode, which is quite rare on cheap radios. One bit of advice, though: it really needs a better antenna than the one supplied in order to get decent reception on the AM and SW bands.

No airband. I bought this for the airband feature and it does not have it