From the Channel: RB48 First Impressions & Off-Grid DMR

Not everyone has time to watch every upload. Here are plain-language summaries of two recent channel videos — the points worth knowing even if you only read this post.

Retevis RB48 — heavy-duty FRS, out of the box

Video: Retevis RB48 4-pack Unboxing and First Impressions (June 18, 2026)

The RB48 is a four-pack of license-free FRS handhelds marketed for construction, farms, family use, and emergency kits. First impressions from the unboxing:

• Build: Rugged feel — IP67 waterproof and dustproof rating, which is unusual at this price point for a consumer FRS pack.
• What's included: Four radios, charging setup, and accessories — ready to deploy as a set rather than buying piecemeal.
• Use case: Property coordination, job sites, outdoor activities, and glove-box emergency pairs. FRS means no GMRS license required, but lower power and fewer channels than GMRS.
• Honest framing: First impressions only — long-term battery, range in Appalachian terrain, and durability over months of daily carry are follow-up topics.

If you are shopping FRS for family or property use, compare against GMRS (license required, more power and repeater access). The free GMRS reference card explains the difference in one page.

Gear link: Retevis (affiliate)

Off-grid DMR — digital radio when the grid is down

Video: Solar Powered Emergency Wi-Fi DMR Hotspot That Runs Indefinitely (June 15, 2026)

A comment claimed "DMR dies when the power goes out." The video is a live demonstration proving the opposite — with the right infrastructure, digital modes keep working off-grid.

The chain shown:

• Power from a vehicle (no wall outlet)
• Raspberry Pi running a Wi-Fi hotspot
• Starlink for internet backhaul
• DMR radio connecting through the hotspot into the wider network

The takeaway: Digital radio does not fail because it is digital. It fails when your supporting infrastructure fails — no power, no IP path, no hotspot. Build redundancy (battery, solar, alternate backhaul) and DMR remains viable in an outage.

This is PACE thinking in practice: your primary might be cell; your alternate might be local repeaters; your contingency might be simplex; your emergency might be a self-contained hotspot plus satellite backhaul. One layer is never enough.

For DMR talkgroups relevant to East Tennessee, see the DMR section on the local frequencies page — Tennessee statewide (3147), TEMA (31478), and neighboring statewides.

More uploads are on the video library. If a topic should become a full article here, let me know.

← All articles  ·  Start here  ·  Just licensed  ·  Free downloads  ·  Newsletter