Accessories & tools

Out of the box the ATS Mini is good. A handful of cheap additions make it genuinely nicer to carry and listen with, and one of the most useful is not a gadget at all. It is the right cable. Assembling everything from scratch? The starter kit checklist lists the whole kit in one place.

A stand and a mount

A 3D-printed stand props the radio at a readable angle on a desk. Printed parts vary between sellers, and the V3 and V4 cases differ slightly in size, so check the listing is cut for your revision. A small magnetic base lets you stick a whip to a steel rail, a radiator or a car roof and aim it. It is a mechanical mount, though. On shortwave the whip is a capacitive probe, not a tuned monopole, so do not expect the metal to act as a proper ground plane. Where there is no steel to stick to, a spring clamp with a ball head does the same job on a balcony rail, a curtain pole or a branch, and it is the usual way people hang a Mini Whip or a loop outdoors.

The cable that is not a gadget

The ATS Mini charges and flashes firmware over the same USB-C port, and plenty of cheap cables only carry power. If a firmware update or this site’s USB remote will not connect, a charge-only cable is the usual culprit before the radio is. A known-good short data cable takes the guesswork out of it. See connecting over USB or Bluetooth.

Earphones and the headphone amp

The ATS Mini has a 3.5 mm jack driven by a built-in headphone amplifier, so decent earphones earn their keep. Shortwave and SSB live down in the noise, and a half-decent set lets you hear into it instead of past it. The KZ Castor is a cheap tunable dual-driver set, around sixteen dollars, with little switches that let you tame hissy shortwave; there is a pricier Pro version if you want it. If your phone has dropped its headphone jack, a small USB-C DAC dongle lets the same earphones plug into it — that one is for the phone, not the radio, which has its own 3.5 mm out.

Getting the radio’s audio into a computer

To record what you hear, or to run the in-browser digital decoders, the computer needs the radio’s audio as an input. How you get there depends on the sockets you have. A desktop PC with a separate microphone jack (usually pink) is easy: run a 3.5 mm cable from the radio’s headphone out straight into it, and it shows up as an input you can pick. It is a microphone input, though, so keep the radio’s volume low or the level overloads and distorts.

A laptop or a Mac is the awkward case. Modern machines have one 3.5 mm combo jack, and the moment you plug a cable in it switches to output — so the radio never appears as an input at all. The honest fix is a USB audio adapter that gives the browser its own selectable input device. A little USB sound card with a 3.5 mm mic input does the job for a couple of dollars; that input is mic-level, so keep the radio quiet and the level behaves. If you care about recording or decoding, look instead for an adapter with a real line input — it takes the radio’s output at its own level with no fiddling.

One symptom is worth naming, because it looks like a broken adapter and is not. If the recording carries a steady mains hum, or the noise floor rises the moment the laptop goes on charge, that is a ground loop: the radio and the computer are tied together through both the audio cable and the mains, and current flows in the shield. A USB isolator between the computer and the audio adapter breaks that path. Buy it for that symptom, not as a default.

You can technically feed a Mac’s combo jack with a passive cable, but it is not worth it: it needs a CTIA-wired TRS-to-TRRS mic adapter plus about 40–50 dB of attenuation to bring line level down to mic level, and the result is still mono and fragile. A USB adapter is cheaper to get right.

The NanoVNA, and what it is really for

Here is the part most blog posts get wrong. The ATS Mini’s antenna input is high-impedance by design, not 50 ohms, so a NanoVNA, which is a 50-ohm instrument, cannot meaningfully measure the radio itself or a short whip. What it is good for is the antennas you build: tuning a loop or a dipole to resonance, and checking whether a mystery adapter or a length of coax is lossy. If you like making antennas it is a great tool. If you just want to listen, it is happily skippable.

The last few dollars

Two small things finish the kit. A hard case keeps the radio and a spare whip from rattling around a bag, which is mostly how whips get bent. A sheet of protector film cut down to the 1.9-inch panel costs about as much as a coffee — nobody sells one pre-trimmed for this screen, so buy a sheet and cut it. If you run an active antenna, it needs a bias-tee to power it, which lives with the antennas.