RTL-SDR Blog V4 Review 2026: Built-In HF, TCXO, Dipole Kit
The RTL-SDR Blog V4 is the current default answer to "what SDR should I buy?" It's $35–$40, covers 500 kHz to 1.766 GHz, and works with every major SDR program. But what actually changed from the V3, and does the built-in HF live up to the marketing? Here's what a few months of real use looks like.
What's New in the V4
The V4 is the first RTL-SDR Blog dongle to move away from the R820T2 tuner chip. That tuner is out of production, and RTL-SDR Blog redesigned around the R828D — a tuner originally built for digital TV that happens to work well across a wide spectrum when paired with the RTL2832U backend.
The meaningful changes:
- Built-in HF reception via an internal triplexer, no upconverter required
- Improved filtering that rejects FM broadcast band overload and common out-of-band interference
- 1 PPM TCXO for frequency stability across temperature
- Aluminum enclosure with a thermal pad to the PCB for better heat dissipation
- SMA antenna connector (not MCX)
- USB passthrough bias tee for powering LNAs and active antennas (software-controlled)
None of these are paradigm shifts. They're the accumulation of five years of feedback on what RTL-SDR dongles needed. The built-in HF is the headline feature and the reason most people should buy the V4 over the older V3.
V4 vs V3: The Comparison That Matters
| Spec | RTL-SDR V4 | RTL-SDR V3 |
|---|---|---|
| Tuner chip | R828D | R820T2 |
| Frequency range | 500 kHz – 1.766 GHz | 500 kHz – 1.7 GHz |
| HF reception | Native (triplexer) | Direct sampling mod |
| TCXO | 1 PPM | 1 PPM |
| Filtering | Improved multi-stage | Basic |
| Bias tee | Yes (software toggle) | Yes (software toggle) |
| Enclosure | Aluminum + thermal pad | Aluminum |
| Connector | SMA female | SMA female |
| Typical price | $35-45 | $30-40 |
Verdict: If you don't already own an upconverter and you want to listen to shortwave, amateur HF, or medium wave broadcasts, the V4 saves you $40+ on a separate upconverter. That alone pays for the upgrade. If you're VHF/UHF only and cost-constrained, the V3 remains a fine choice.
Real-World Reception
HF (500 kHz – 28 MHz)
With the included dipole antenna tuned to 40 meters (~7 MHz), the V4 pulls in international shortwave, amateur SSB/CW, and WSPR beacons reliably once the band is open. Sensitivity is noticeably better than a V3 with the direct sampling mod enabled, though it's not Airspy HF+ Discovery territory — the V4's 8-bit ADC and crowded HF bands mean strong stations will desensitize nearby weak ones. For casual HF monitoring it's genuinely usable. For serious DX work, see our Airspy vs RTL-SDR comparison.
VHF/UHF (28 MHz – 1.766 GHz)
This is where RTL-SDRs have always shone, and the V4 is the best one yet. Public safety in the 450–470 MHz band, 700/800 MHz trunked systems, 1090 MHz ADS-B, 137 MHz weather satellites — all work well. The improved filtering is most obvious if you live near an FM broadcast tower: the V3 will get overloaded and bleed images into the air band, while the V4 cleans most of it up without an external notch filter.
P25 Digital
Using SDRTrunk with two V4s (one on control, one on voice), we tracked a P25 Phase II system for several hours with no dropped calls and BER under 1%. This is the setup we recommend in our SDRTrunk setup guide. A single V4 can follow a Phase I conventional system without trouble.
Software Compatibility
The V4 works with every major SDR program as long as you're on updated drivers:
- SDR# (SDRSharp): Works natively with the RTL-SDR V4 driver branch
- SDR++: Full support, cross-platform
- GQRX: Works on Linux/macOS with updated librtlsdr
- SDRTrunk: Primary SDR for P25/DMR trunking at this price point
- SDRangel: Full support
- HDSDR: Works via ExtIO
- dump1090: ADS-B aircraft tracking
- DSD+ Fastlane: For digital voice decoding
Older guides still circulate that use RTL2832U drivers predating the V4. If you tune below 28 MHz and get silence, you're on the wrong driver — grab the RTL-SDR Blog V4 branch and the HF band will come alive. Our SDR software comparison covers which program to pick for which task.
Who Should Buy the V4
Good fit
- First-time SDR buyers
- Upgraders from older RTL2832U dongles
- HF listeners without an upconverter
- P25 trunking builders (buy two)
- ADS-B, weather sat, and scanner-style monitoring
Skip it for
- Serious HF DX — get an Airspy HF+ Discovery
- Wide-bandwidth analysis (>2.4 MHz) — see SDRplay RSPdx
- Transmit capability (it's receive-only)
- Decrypting encrypted police — no receiver can do that
Buy the Right Version
RTL-SDR Blog V4 — Dongle + Dipole Kit
For first-time buyers: this is the bundle to get. Dongle plus the multipurpose dipole kit means you can start listening the day it arrives. The dipole covers 25 MHz to 1.7 GHz with element adjustment — not a precision antenna, but enough to explore every band the V4 tunes.
Check Price on Amazon →Frequently Asked Questions
Is the RTL-SDR Blog V4 worth it over the V3?
For most people, yes. The V4 uses an R828D tuner instead of the R820T2, adds native HF reception through an internal triplexer (no upconverter needed), and has improved filtering against FM broadcast overload. If you're buying your first SDR or upgrading from an older dongle, V4 is the better choice. V3 only wins on price when you don't care about HF.
What is the frequency range of the RTL-SDR V4?
The V4 covers 500 kHz to 1.766 GHz continuously, with native HF reception below 28.8 MHz and direct VHF/UHF reception above it. The built-in triplexer handles the handoff automatically, so you don't need an upconverter or mode switch.
Does the V4 need drivers?
The V4 works with existing rtl-sdr drivers, but you need a recent build. Use the RTL-SDR Blog V4 driver branch on Windows or upgrade libusb and librtlsdr on Linux/macOS. Older drivers written for R820T2 tuners won't recognize the R828D and will fail to tune below 28 MHz.
Can I decode P25 with an RTL-SDR V4?
Yes, using DSD+ or SDRTrunk. For P25 Phase I conventional channels, one V4 is enough. For P25 Phase II trunked systems, you should run two V4s — one on the control channel and one on voice — to avoid missing call transitions. See our SDRTrunk setup guide.
What antenna comes with the V4 bundle?
The RTL-SDR Blog V4 dipole kit includes telescopic antenna elements (dipole and monopole configurations), suction cup and clamp base mounts, three meters of RG174 coax, and SMA adapters. It covers roughly 25 MHz to 1.7 GHz with element adjustment and is a genuinely useful starter antenna.
Is the TCXO on the V4 accurate enough for digital modes?
The V4's 1 PPM TCXO holds frequency within roughly ±1.5 kHz at 1.5 GHz, which is stable enough for P25, DMR, NXDN, and most ham digital modes. For weak-signal HF work (WSPR, FT8 at the edge), a GPS-disciplined oscillator would be better, but the V4 is far tighter than the ~30 PPM crystals used in generic RTL2832U dongles.
Can the V4 decode encrypted police radio?
No. No receiver — SDR, scanner, or otherwise — can decrypt AES-256 encrypted police traffic. If your local agency has encrypted, the V4 won't change that. It will, however, still pick up unencrypted fire, EMS, aviation, amateur, railroad, and federal conventional traffic in your area.
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