Who is the RockBLOCK 9704 for?
Series Building with the Iridium 9704 Part 5 of 10
In short
Teams that want a product quickly without designing RF or certifying from scratch.
Designing the 9704 module into your own product means handling power and the antenna, and going through certification. N3D brings in Ground Control's RockBLOCK 9704 so customers can build products at lower cost and in less time.
What it is
The RockBLOCK 9704 is a Ground Control product: a small board carrying an Iridium Certus 9704, with power handled and a serial interface over USB-C and TTL. It comes in two versions:
| Model | Antenna |
|---|---|
| RockBLOCK 9704-ANT | Integrated patch antenna |
| RockBLOCK 9704-SMA | SMA connector for an external Iridium 9704-certified antenna |
According to Ground Control, the RockBLOCK 9704 comes fully certified when used with the recommended antenna and cable.
Why it saves time and cost
- No RF design: the module, power and antenna are ready-made.
- Much less certification work: Ground Control has already certified the RF side. A product still needs Iridium ICE certification before it is sold, including by a reseller, but there may be less to add than when integrating the module from scratch.
- Code is available: Ground Control provides Python, C and Arduino libraries.
- Try it from a computer: connect over USB-C and start sending and receiving, without the Launch Pad's 32 KB RAM limit.
Limits to know
- No processor of its own: it cannot run on its own and needs a computer, a Raspberry Pi or your controller.
- Larger than the module: it may not fit very small products.
- Unit cost at volume: at high volume, integrating the module yourself may cost less, but you carry the design and certification.
Using it with IMT CC
RockBLOCK 9704 units bought from N3D are activated directly on IMT CC, with no separate registration on Ground Control's Cloudloop, and the first two months of the IMT CC monthly fee are waived. N3D will sell them once Iridium ICE certification is obtained; it is in preparation.
Sources
- Structure, interfaces, antenna versions, libraries, need for a controller: Ground Control, RockBLOCK 9704 documentation.
- Fully certified with the recommended antenna and cable: Ground Control, "RockBLOCK 9704 — IMT" documentation.
How is the RockBLOCK 9704 different from the 9704 Launch Pad?
The Launch Pad is Iridium's development board, with its own processor, for evaluation. The RockBLOCK 9704 has no processor but is certified, for building into products.
Can I build a product with it directly?
Yes, that is what it is for. Follow Ground Control's antenna and cable recommendations; the product still needs Iridium ICE certification before sale, and N3D can help.
All parts in this series
From developer kit to certified product: what an Iridium 9704 product needs, the limits of the developer kit, why certification matters, how to choose hardware, where it fits, and measured timing and power. Ten parts, in order, each readable on its own.
- What do you need to build an Iridium 9704 product?
- What problems does IMT CC actually solve?
- What are the limits of the Iridium 9704 Launch Pad?
- Why do 9704 products need certification, and what does it cover?
- Who is the RockBLOCK 9704 for?
- Launch Pad, N-9704, RockBLOCK 9704 or your own design: which should you choose?
- Where can the IMT 9704 be used? Mountain rescue, maritime and monitoring
- How should power be designed for the 9704?
- Why can an IMT message take several minutes?
- How does the Iridium 9704 compare with Starlink and OneWeb?
Related notes
Related hardware
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Updated 2026-10-27
N3D supplies satellite communication for alpine and industrial use. See services