SI4732 All Band Full Frequency Radio Receiver, FM AM (MW and SW) SSB (LSB and USB) with Speaker, Antenna, Battery, Black

Works quite well. It's a great way to learn about SDR receivers. Good build quality. Exceeds my expectations. Plan on using it as a receiver for my QRP transmitter projects.

Kept power cycling causing the audio to flutter constantly. Sent back for another, did the same thing. Seemed pretty useless tho it sort of worked.

Works, basically easy to deduce the menus double press, long button press, hold and turn etc. I must be near active transmitters but managed rfi area because I hear plenty of correspondance with the low budget, space constrained BNC telescopic whip antenna. I receive shortwave broadcasts on 7 mhz, 12mhz AM, amateur radio Morse code on 28.007 mhz, 28.015 mhz, etc, suppressed carrier upper sideband voice on 28.354 mhz, etc. Screen is good, small, but concise and updates to your latest command quickly and without flashes or gaps. Don't break those little power switches on the back. Battery charges fast (5 watts) (for an hour) and provides clean lithium four volt power for many perhaps a dozen hours. Speaker good; demodulated cw, usb lsb AM voice audio all demod and produced at speaker good. Small and light and power efficient.

Really good quality, many bandwidths to work with, good reception. Overall a really good small radio

update on arduino ide flash procedure: on ryzen systems, you will want to substitute the latest avrdude binary for the one included in the arduino ide. the version they pkg is too old and times out on ryzen systems. its technical and complex to fix this on your own (build from git source, install to local/bin, ln -s, on linux, basically) but if you want to flash your radio with latest source, you will need latest avrdude or flash update procedure will just keep failing. also, you DO want version 3 of the public source. its a huge upgrade. I am an arduino dev and have been for over 7 years. that said, I had trouble flashing/updating this until I finally switched computers from my very modern AMD ryzen to an older intel. this is likely due to some usb changes and the realtime flash over usb is no longer in timing spec for the arduino nano that is used in this radio. this is not about this radio, per se, but about the 328 nano and its bootloader. took me days to finally find it (by luck) by switching to an older i3 intel box and that usb system flashed this just fine. wow, that took days - hopefully you dont try to flash this over a ryzen. find an old intel laptop. old is good, even 10 years is fine. anyway, update it to version 3.x that you find online. I changed some features to suit me and this was a fun project. internal build is not great, to be honest. was hoping I'd get an at20 'plus' but this was the non-plus version. hoping the at20+ (better fm BP filter and better encoder) shows up on amazon soon as that will be a better unit than this.

If you are a computer programmer or code writer this is the item for you. All the examples of the radio that I saw mentioned firmware UPGRADES were available. To me "upgrade" means taking an existing, functional thing and improving performance somehow. It also means that some version of firmware is already installed, mine came with zero firmware, version 0.0.0 . If you are old and retired and are buying this to be a casual SW listener, don't waste your money, unless you are a retired computer whiz. UPDATE! I have to say that my initial review was based on a malfunctioning unit. When I discovered it was broken and the was the problem, I returned it for replacement. It all went through slick as snot, Thanks for a easy return process, Amazon! The new unit worked right out of the box and i couldn't be more pleased with it. It does not have a bunch of bells and whistles, but for hobby listening it is perfect for me. Handier than a forked stick. Portable does not even begin to describe it. Battery life is great so far. I am a casual SW listener but it gets five stars from me.

Two items defective out of the box. I ordered one of these little radios with great expectations. When the first one arrived I was impressed with its heft, construction, labeling and the screen clarity. The problem started when connected to a known antenna source. The radio immediately began to oscillate on the audio portion of the output. Enough to distort the incoming radio stations signals to unstable and poorly audible quality. I asked for a got an RA and exchanged the first one for the second radio. Out of the box I had the same problem I relocated the radio to a totally different geographical area in case it was environmental issues affecting the reception. No difference. Returning the radio for credit. The radio is easy to use and the controls easily understandable. It just does not have stability in the reception of signal. Pay a little bit more for a known brand without these problems. The response of the vendor was exceptional.

This is a nice receiver. Frequency range is 149KHz to 30MHz AM/LSB/USB/FM receiver. with 1 watt speaker. The FM Receiver works from 76.0 to 108.0MHz. 10 bands, up/down volume AGC on/off /gain. Bandwidth buttons. Receives FM and AM well. Sound has cycling when the battery is low. This is a nice entry level unit to get into HF reception. On my unit, the "Mode" button did nothing so I am stuck in AM only.