r/RTLSDR
Low-cost software defined radio (RTL2832 SDR) community
Founded March 2012 · Public — anyone can post
A subreddit for the low-cost software defined radio (SDR) community. While originally dedicated to the [RTL2832U USB rtl-sdr](http://sdr.osmocom.org/trac/wiki/rtl-sdr) project, relevant content related to general SDR, RF, and similar projects are also welcomed.
Members
139,264
139K
Online now
—
not captured in the last snapshot
Posts per day
4.5
from the last 100 posts, spanning 22.2 days
Comments per post
—
no sample yet
Growth · 7d
—
not enough history yet
Growth · 30d
+1.0%
+1.4K members · ≈31d
Promo tolerance
—
not assessed yet
Last post
Oct 9
sampled Oct 9
Distinct posters
81%
of the last 100 posts
Tracking since Aug 7 · growth spans are the real distance between snapshots, not rounded windows. Posts/day is measured from the community’s own newest posts on Reddit, not from what Prowlo happens to crawl.
Member growth
Similar by content
Communities that discuss what r/RTLSDR discusses.
Subreddit for all things Software Defined Radio (SDR), both hardware and software.
This subreddit is dedicated to both amateur and professional engineers that want to build cool stuff at home, challenge themselves to learn new technologies, learn from each others' designs, and showcase their side projects.
Welcome to Reddit's own amateur (ham) radio club. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed operators throughout the world experiment and communicate with each other on frequencies reserved for license holders. All topics relating to the hobby are welcome here, from purchasing and building equipment, to operating techniques and activities, and everything in between.
Community of AnalogTV application users and testers. See https://analogtv.net for more details.
See the full lists on similar subreddits.
r/RTLSDR — frequently asked
How many members does r/RTLSDR have?
r/RTLSDR has 139,264 members as of our most recent crawl on Oct 9. Prowlo re-checks tracked communities on a rolling schedule, so this figure moves rather than sitting frozen at whatever it was when a scraper last ran.
Is r/RTLSDR growing?
Over the last ≈31 days r/RTLSDR changed by +1.0% — a gain of 1.4K members. We compare against the nearest snapshot we actually hold and state the real span rather than rounding it to a clean "30 days".
How active is r/RTLSDR?
Around 4.5 posts per day, measured from the newest 100 posts on Reddit, which span 22.2 days. Posting rate matters more than subscriber count when you're deciding where to spend your time — it determines how long your comment stays visible.
When was r/RTLSDR created?
r/RTLSDR was founded in March 2012 and is a public — anyone can post community. Age matters: an older community with steady growth has survived Reddit's moderation churn; a young one with a spike may not.
Who posts in r/RTLSDR?
Of the last 100 posts we sampled, 81% came from distinct accounts; the newest was published Oct 9. A low share means a feed dominated by a handful of accounts (bots, mods, or one prolific poster) rather than a community.
Can I promote my product in r/RTLSDR?
We don't have a promo-tolerance read for r/RTLSDR yet. Default to the safe approach: read the sidebar rules, contribute in threads where you gain nothing, and mention your product only when it is the honest answer to someone's question.
How do I monitor r/RTLSDR for mentions?
Hit Watch on this page. Prowlo starts crawling r/RTLSDR into your Dataset — every new post indexed and embedded, searchable semantically, queryable by your AI agent over MCP, and able to trigger keyword alerts in Slack. Prowlo is read-only; it never posts on your behalf.
Can my AI agent read r/RTLSDR's stats?
Yes. Everything on this page is one MCP tool call away: catalog_get_subreddit returns r/RTLSDR's members, growth, promo tolerance and similar communities as typed JSON — free, no credits. Connect your agent to api.prowlo.com/mcp and it can vet the community and start watching it in the same conversation.
Read-only · Human-in-the-loop
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