Yaesu FT-710
What a Modern SDR Subtracted — and What That Bought

00 · Start here

Two "facts" about the FT-710 that are simply wrong

Both circulate widely online. Neither survives contact with Yaesu's own product page.

01 · Line-up

AESS, Field, and the Japanese-only variants

One radio, two accessory bundles, and an import trap.

Two practical notes: the SP-40 mounted on the left side blocks the SD card slot; and Field units appeared in European retail around late 2023, after the Japanese release of 2023-07-01.

The import trap. Japan also sells the FT-710M (50 W) and FT-710S (10 W, 20 W on 6 m) at the same ¥154,000 as the 100 W model. Units that surface on auction sites as "FT-710" and refuse to go above 50 W or 10 W — with the power digits turning yellow — are these board-limited variants. The cap cannot be removed.

Coverage and regional limits. RX 30 kHz–75 MHz continuous (guaranteed specs on 1.8–29.7 and 50–54 MHz); TX on the amateur bands 1.8–54 MHz, 5–100 W (AM carrier 5–25 W). Transmit on 70–70.5 MHz (4 m) is UK-version only; UK/European firmware C2 can open 5.250–5.406 MHz. US units ship with 15 preset 60 m memories plus an Alaska emergency channel (5.1675 MHz, within 92.6 km, SSB, ≤150 W PEP); a MARS/CAP expansion extends TX to 1.8–30 MHz (HRO offers the mod for $39.95). Stability ±0.5 ppm after one minute of warm-up. Made in Japan, three-year US warranty.

02 · Inside

Pure direct sampling: dual 14-bit converters, an FPGA, and two DSP cores

QST's framing: "Unlike the higher-priced FTDX10 and FTDX101D/MP, it's a direct-sampling SDR rather than a hybrid design with roofing filters."

Antenna (SO-239)
  → preselector — continuous half-octave bandpass, not strictly per-band
  → attenuator  OFF / 6 / 12 / 18 dB   (remembered per band)
  → IPO (bypass) / AMP1 (≈10 dB) / AMP2 (≈20 dB)
  → dual-channel 14-bit ADC   (third-party teardown: TI ADS62P45, I/Q pair — Yaesu has never published the part)
  → FPGA — combines the two converter streams, DDC, generates the PRBS dither, builds the FFT scope
  → NXP dual-core 32-bit floating-point DSP, 594 / 198 MHz
      filtering · demodulation · DNR · NB · DNF · CONTOUR · APF · AGC
  → DAC → audio, 2.5 W @ 4 Ω

Transmit runs the other way: mic → codec → DSP → digital UP-converter in the FPGA
  → high-speed DAC produces the excitation directly at the final transmit frequency → PA

The clock is a 250 MHz HRDDS with a ±0.5 ppm TCXO. ab4oj's aliasing tests put the effective converter rate at 62.5 MHz (125 MHz to the converters after division); RadCom describes the transmit DAC as running at 250 MHz. The receive chain is a direct-sampling superhet with a digital low IF of 18 kHz (SSB/CW) or 24 kHz (AM/FM), which is why Sherwood's table lists "First IF rejection: N/A" — there is no first IF to reject.

Three design decisions explain the measurements:

• Two converters, combined digitally. Yaesu: the FPGA combines the signals "to reduce overload and overflow of the A/D converters and improve blocking characteristics."
• Always-on dither. The FPGA injects pseudo-random noise before conversion to suppress quantization error and improve IMD. There is no menu item to disable it — no IP+ equivalent. Front-end gain is IPO/AMP1/AMP2 plus the four attenuator steps, nothing else.
• No roofing filter, therefore no filter options to buy. Selectivity is entirely DSP: SHIFT/WIDTH/NOTCH/CONTOUR/APF/DNR/NB, CW bandwidth down to 50 Hz. This is the architectural difference from a K3S or FTDX10, and it is the reason the close-in numbers hold up while far-out blocking suffers.

Protection behaviour, measured two ways: ab4oj found soft overload beginning near +2 dBm at the input (BDR 128 dB by his method); RadCom measured front-end gain compression starting around +1 dBm with IPO (10/20 dB lower with AMP1/AMP2). Sherwood's blocking figure of 129 dB is a 3 dB gain-compression point at 100 kHz spacing, and he notes explicitly that a signal above +1 dBm — nominally S9+74 dB — trips the protection circuit. There is no ADC overload (OVF) indicator, which ab4oj lists as a gap versus other direct-sampling rigs.

Marketing says "band-pass filters dedicated for the amateur bands"; ab4oj, citing the service manual plus his own sweep, reports continuous half-octave coverage with no in-band/out-of-band difference — trust the measurement. Below 1.7 MHz an 8 dB pad is inserted; sensitivity rolls off under 500 kHz and is down more than 30 dB at 200 kHz.

03 · Lab bench

Two independent labs, one consistent story

Sherwood's row for S/N 2J020104 (tested 2022-10-01, factory firmware), plus ARRL's QST re-measurement.

Sherwood's own caveat applies to every ranking on his table: he sorts by close-in dynamic range at 2 kHz because it is "the acid test for CW & RTTY contest / DX pile-up operation", but "it is WRONG to interpret this single measurement as being representative for the overall performance of the radio."

ARRL's QST re-measurement agrees within 1 dB — DR3 106 dB at 2 kHz, blocking 128 dB, RMDR 116 dB at 2 kHz, noise floor −127 dBm — with one disclosure that matters when quoting those numbers: the review sample initially failed to meet specifications, Yaesu traced it to a defective component inside the SDR unit and replaced the whole SDR board, after which it passed easily. That is first-hand evidence about early-batch QC.

Against the field (Sherwood table, 2026-08-01 revision)

ᵃᵇ = measured with Icom's IP+ (dither) ON — the correct comparison against the FT-710, whose dither is always on. With IP+ off, the IC-7610 drops to 76 dB and the IC-7300 to 84 dB. ᵖ/ᵠ = K3S figures depend on the optional crystal roofing filters, a different mechanism from the FT-710's pure DSP filtering.

Read the table by dimension, not by rank:

• Close-in DR — the FT-710 wins its class. 107 dB at 2 kHz: 18–20 dB above an IC-7300 Mk2, 10 dB above an IC-7300, 9 dB above an IC-7610 that costs three times as much. Only the FTdx-101D measures higher.
• Blocking — clearly behind. 129 dB sits just at Sherwood's "130 dB is a good number" line, 12 dB below the FTdx10 and 21–22 dB below a K3S or TS-890S — though still 6–7 dB above all three Icoms. ARRL confirmed the mechanism: the FT-710's blocking is essentially identical at 2, 5 and 20 kHz offsets (127–128 dB), because it is set by the converter's absolute overload point rather than by filter spacing.
• Noise floor and sensitivity — the other soft spot. −127 dBm and 0.66 µV in IPO are the weakest in the set; Preamp 1 is not optional on 10 m if you want quiet-rural weak-signal work.
• Phase noise — genuinely strong. 150 dBc/Hz at 10 kHz is 13 dB better than an IC-7300, 6–7 dB better than an IC-7300 Mk2, 4 dB better than an IC-7610; only the FTdx10, FTdx-101D and TS-890S measure higher.
• AGC threshold — worst in class and fixed. 4.0 µV with IPO against Sherwood's preferred 2.5 µV. All three Yaesu models share this trait.

One comparability trap worth repeating: never place the FT-710's 107 dB next to an Icom's ac (dither-off) figure. Dynamic range compares against ab, noise floor against the unfootnoted value. Get this wrong and the ranking inverts.

04 · The upgrade question

FT-710 versus FTDX10: what the extra $600 buys

Sherwood's summary of his own long report: on 20 metres the two are "almost identical" in noise floor, AGC threshold, sensitivity and dynamic range.

The short version: the FTDX10 buys far-out and out-of-band blocking with a physical 9 MHz IF and roofing filters. The FT-710 answers with a newer NXP DSP, always-on dither and dual-converter combining to tie the close-in figure, while being lighter, cheaper, deeper-filtering (108 vs 105 dB), and fitted with an ATU. It gives up 12 dB of blocking, the decoders, and screen size. Sherwood adds a subjective line worth quoting: "Overall the ergonomics of the 710 are better than the FTdx10." One eHam reviewer (W8RMV) sold his FTDX10 for an FT-710 over DNF/NB distortion complaints that NC0B and N4HNH had also raised.

Choose by use, not by rank: serious CW contesting or SO2R → FTDX10 or K3S. Value, portability, transmit audio and a modern waterfall at $1,000 → FT-710. Two receivers or a 7-inch screen → IC-7610 / FTDX101 — noting that the IC-7610 measures 98 dB close-in against the FT-710's 107 dB at a third of the weight in your wallet. Ultralight SOTA at $500 → Xiegu G90 (78/76 dB, a different class entirely).

05 · Firmware

Six releases, then silence

Four separate firmware images — MAIN, DISPLAY, DSP, SDR — updated from an SD card.

Two and a half years without a release as of September 2026 — while Yaesu's 2025 FTX-1 keeps getting updates. QRZ forum users read this as a deliberate product-cycle choice. No firmware release ever changed the receive dynamic-range figures: the improvements were DNR, SCU-LAN10, mouse support, CAT and keying noise. (Sherwood's 107 dB was measured on SDR V01-03, ARRL's 106 dB on V01-04 — within sample scatter, which Sherwood puts at under 6 dB.)

Update procedure traps — most bricked-update reports come from these four:

1. Update DISPLAY first. Yaesu's own warning: "If the MAIN firmware is updated first, the transceiver may not work properly."
2. .SFL files go in the SD card root — not in Capture/MemList/Menu/PlayList — and the card must be formatted in the radio first.
3. Reset afterwards: power off, hold [DSP REST] + [FINE/FAST] while powering on; success shows 7.000.000 MHz.
4. No Windows required for the firmware itself (any OS can copy to the card), though Yaesu's programming software is Windows-only.

06 · Field experience

Known issues, ranked by how often they actually bite

From eHam's 78 reviews, QRZ, Reddit, groups.io and two lab reports. No recalls, no service bulletins, no safety notices exist for this model.

Equally important — what we could not find: no official recall, free-repair programme or safety notice (searched Yaesu Japan/US, hamlife.jp timeline, QRZ, Reddit, groups.io); no reports of systematic internal birdies (one documented spur turned out to appear on a second FT-710 400 m away, i.e. an external source); no cluster of touchscreen failures; no widespread clock-drift or frequency-offset complaints. Yaesu USA's support line even has a dedicated "SDR HF Technical Support" menu option.

07 · Control

One USB cable, four devices — and no LAN port

Yaesu's own page has promised network remote "available in the near future" since launch; today it still requires the external SCU-LAN10.

A third CAT path exists: the TUNER/LINEAR port can switch to 5 V TTL serial CAT at 38400 bps with the optional CT-58 cable, but it is mutually exclusive with an external tuner or amplifier. Otherwise the rear panel carries USB-A (keyboard/mouse), DVI-D, the SD slot, 6-pin mini-DIN (RTTY/DATA), 8-pin mini-DIN (tuner/linear/second CAT), 3.5 mm KEY / REM-ALC / EXT SPKR / PHONES and an RJ-45 mic jack. There is no RS-232 port as such, no separate receive antenna jack and no transverter output.

CAT lineage — useful when software lacks a profile

The protocol (CAT manual OM 2306-C) is Yaesu's two-letter ASCII set with fixed-length fields and a semicolon terminator — FA014250000; sets VFO-A to 14.25 MHz. Ham Radio Deluxe's knowledge base states plainly that FT-991A and FT-710 commands are identical apart from three new AESS commands, which is why HRD tells FT-710 owners to use the FT-991A profile. (That same article's title says FTDX10 while its body says FT-991A — trust the body.) Because CAT exposes FA and FB as independent frequency commands, the FT-710 has no SO2V limitation of the kind N1MM documents for the IC-7300's CI-V.

SCU-LAN10 versus the built-in USB path

Timeline note: at launch the SCU-LAN10 did not support the FT-710 at all (a 2023-10 Reddit thread is titled exactly that); support arrived with V01-11 in November 2023.

The pitfall checklist that saves an evening

1. Windows USB audio device: 44100 Hz, 16-bit, enhancements off. The "studio quality" 48 kHz default breaks TX audio.
2. CAT-1 TIME OUT TIMER: change 10 ms → 1000 ms. The factory value is short enough that ?; queries get wrongly rejected.
3. MOD SOURCE must be AUTO, or remote PTT keys the radio with no modulation.
4. DATA modulation source = USB; select DATA-U/L explicitly where needed.
5. Remote CW keying: do not rely on the CAT KY command (carrier comes up but elements get lost). Use per-element DTR keying on CAT-2 (USB KEYING (CW) = DTR, CW BK-IN = ON/SEMI). On Linux some cdc_acm drivers cannot control DTR and will leave the radio stuck transmitting — if that happens, set USB KEYING (CW) to OFF.
6. The internal ATU cannot be triggered over CAT. No such command exists; you must press TUNE on the panel.
7. Counter-intuitive: enable the "SCU-LAN10" menu item even with no hardware attached — that switch is what turns on USB spectrum output.
8. Pick the Enhanced COM port for CAT; the Standard one is for keying/PTT. Different applications may need different port numbers.
9. Linux: add a udev rule for 0403:601c; CAT uses the CP2105 if00 interface at 38400 bps. RF in the shack can travel back down the USB cable and crash CAT — one user needed eight ferrites.
10. WSJT-X has been reported to emit a short transmit burst right after a band change; keep an eye on it during contests.

08 · Software

The ecosystem, and the spectrum channel nobody documented

Where support stands in 2026, and what this site contributed.

What this site added

Yaesu never documented the FT4222H spectrum channel. Our reverse-engineering write-up did: 4096-byte frames carrying 850 amplitude bins per receiver at roughly 30 fps, inverted amplitude bytes, a 150-byte metadata block and sync tail; SPI at 375 kHz with SS = 0x01; the CAT side needs 38400 bps, AI0; to stop the auto stream, a 20 ms post-write delay, and EX040101/EX040200 to switch scope output on. Transmit corrupts the scope stream, so the driver closes and reopens the FT4222 around TX; when the S-meter is unavailable we synthesize one from the spectrum. That work is what MRRC Modern runs on.

Related reading from our own work: the USB internals, Opus versus PCM for remote audio (which is why the SCU-LAN10's ≥2 Mbps requirement matters), and a servo-driven EFHW tuner for antennas the internal 3:1 ATU cannot handle.

09 · Buying

Price, accessories, and where it actually shines

September 2026 street pricing — the list price is not the price.

Read: real transactions cluster in $900–1,100; $1,299 is an inflated list price. Curiously, this check found Field more expensive than AESS by $40 at two dealers, where historically Field ran about $100 cheaper — compare per-dealer, not by rule. Competitor anchors from the same week: FTDX10 $1,649.95, IC-7300 about $1,000 on promotion, IC-7610 $3,499.95 (the 2025 IC-7610-32 at $3,899.95), K3S from $2,300 (10 W) / $2,900 (100 W), Xiegu G90 $499.99.

Accessories worth the money

• SD card (≥32 GB), not included — stores all settings, memories, QSO recordings, screenshots and firmware updates. Note that VOX does not work while recording.
• A 25–35 A supply — TX at 100 W draws 21 A nominal, 18.2 A measured. Owners run Astron RS-35M or Alinco 32 A units; a field report on LiFePO4 (Bioenno 12 V 15 Ah) shows 11.5 A on SSB peaks, and a Reddit measurement gives RX 1.35 A / TX peak 18 A.
• Microphone: the bundled SSM-75E already draws good audio reports; upgrades are the M-70 ($144.95), M-90D ($174.95) and M-100 dual-diaphragm ($439.95). The real lever is the three-band parametric EQ (PRMTRC), which stores a separate profile with the processor on and off.
• SP-40 ($75–125) if you bought Field and want AESS. Opinions split sharply: one reviewer calls AESS "a joke" against a good monitor speaker, most owners like it. It is a voicing choice — listen first.
• No filter options exist — there is no roofing filter slot and nothing to buy. Selectivity is DSP.
• Others: SCU-LAN10 $299.95 / £229.99 (needs MAIN ≥ V01-11); FH-2 CW keyboard $94.95; SMB-209 mobile bracket $37.95; MHG-1 handle $14.95; YH-77STA headphones $84.95; CT-39A data cable $9.95; ATAS-120A mobile antenna $349.95; ATAS-25 portable $209.95; ATBK-100 balcony counterpoise $84.95; FC-40 external tuner $274.95 / €285; RT Systems YPS-FT710 software $25 (needs firmware ≥ V01-10); CatMeters CatTouch/Catknobz for the knob complaint.

Portable and mobile

Field is marketed for "mobile, field day, and portable operations" and there is a dedicated SMB-209 bracket — but the front panel does not detach, so it is less flexible in a vehicle than an FT-891 or IC-705. At 4.5 kg it is not a SOTA radio; POTA and car-camping are its sweet spot, with the MHG-1 handle or the Field strap as the usual additions. There is no internal battery and no IP rating. Current draw comparison from DX Engineering's own video: FT-891 RX 2 A / TX 23 A versus FT-710 RX 2.2 A / TX 21 A; one QRZ reviewer considers the ~1.7 A class receive draw high for backpacking and suggests dropping to 20–40 W in the field.

Where owners report it excelling: NT9M pulled weak stations out from under S9+20 pileups in a 160 m CW contest; VE3VTH worked a buried POTA station on a crowded Winter Field Day band for the first time; K8DXX set up a G90 with a portable antenna next to it and describes the difference as "like night and day"; KK7XE expects it to become "a great rig for portable stuff like POTA, and camping trips".

Reputation, in numbers

eHam carries 78 reviews (June 2026 snapshot) and DX Engineering shows 4.75/5 on both variants (63 and 47 reviews). The recurring praise, across independent reviewers: a quiet receiver with real dynamic range ("best CW receiver I have used in 30 years" — VK2IK), value for money ("punches way above its weight class" — K8DXX), DNR and DSP tooling clearly ahead of the IC-7300, the touch/mouse/DVI desktop workflow, and transmit audio that is good out of the box with plenty of EQ headroom. The recurring complaints are the fan, the STEP/MCH knob, unlit legends, the dated DVI-D output, Windows-only official drivers, and menu complexity relative to an IC-7300.

AESS or Field? Home station and audio-focused → AESS (the SP-40 alone costs $75–125 and the two bundles often differ by less than $100). POTA, mobile, or you already own good speakers → Field, for the strap and the lower weight.

10 · Sources

Primary sources

Every figure on this page traces to one of these; the full annotated source list is in our research notes.

• Sherwood Engineering receiver table and the FT-710 long-form report (S/N 2J020104, tested 2022-10-01) — all comparative lab numbers
• ARRL / QST August 2023 product review — independent lab data and the SDR-board disclosure
• ab4oj's FT-710 bench notes — converter identification, sampling-rate derivation, overload points, service-manual findings
• Yaesu's FT-710 product page plus four official manuals (operation, CAT OM 2306-C, firmware update, SCU-LAN10 update)
• RadCom's G3SJX in-depth review (interior photographs, DAC clock, front-end compression points) and DC4KU's independent test report
• RadioMasterList FT-710 — brochure quotations and price history
• Dealer pages for version differences and pricing: HRO (Field), DX Engineering, GigaParts, R&L, WiMo, MHzOutdoor, hamlife.jp (Japan launch and M/S variants)
• eHam reviews (78), QRZ forums, Reddit r/amateurradio, wsjtx.groups.io, WorldwideDX (Toru Kato's 2023 open-issues list)
• Software: Hamlib (model 1049, issues #2021 / #1550), wfview release notes v2.20/v2.21, RT Systems knowledge base, Ham Radio Deluxe KB (2023-03-28), N1MM+ documentation, POTACAT's FT-710 chapter

Companion reading in the RIG column: No. 1 — the ICOM IC-R9000 and No. 2 — the JRC NRD-535 measure what 1989 and 1991 flagships could do. The FT-710 is the other half of that argument: a modern radio that removed the analog filtering those machines depended on, and got 107 dB of close-in dynamic range for $1,000 — while giving up 20 dB of blocking to a roofing filter that is no longer there.