Lookup/Your meter/Gas
Gas meters — the best odds of the three
If exactly one meter at your address is readable, this is the one. Battery power and drive-by meter reading combined to produce a near-ideal target.
Read the faceplate first
Everything turns on what is physically bolted to the meter. Three cases, and they are easy to tell apart from a phone photograph.
Mechanical dials with a plastic module on top → almost certainly yes
That module is an encoder receiver transmitter — an ERT. It is a retrofit: a small board and a battery, bolted over the existing mechanical register, that reads the dials and broadcasts the number. It exists for exactly one reason, which is so a utility van can read your meter at 25 mph without stopping. That means it transmits unprompted, frequently, and in the clear.
A digital LCD readout → likely yes
A digital gas register is nearly always paired with a radio, because remote reading is the entire business case for replacing a working mechanical meter. Sweep the full band rather than guessing a centre frequency; digital registers are more varied in their channel behaviour than the classic bolt-on modules.
Plain mechanical dials, nothing added → no
Bare dials with no module, no antenna, and no FCC ID anywhere on the meter means there is no transmitter in it. Somebody is walking up to this meter and reading it by eye. Do not buy an SDR for this meter — check your water and electric meters instead, since they were installed at different times by different companies.
Anything with a radio in it carries an FCC ID, by law, printed or stamped on the outside. Find it and look it up — that turns a guess into the filed frequency range. And the converse is a useful negative: if there is genuinely no FCC ID anywhere on the meter, there is no intentional radiator in it.
What it sends
Gas meters are the plainest case on the band. Almost all of them send SCM or SCM+, which carry a meter ID, a commodity type, a cumulative consumption total, and a small set of tamper flags.
| Property | Typical |
|---|---|
| Band | 902–928 MHz |
| Observed in the field | 912.6 MHz |
| Message | SCM (ERT), sometimes SCM+ |
| Interval | Every few seconds, unprompted |
| Payload | Cumulative consumption |
| Encryption | None |
The interval is the reason gas is a good first target: you get a decode within seconds of pointing the antenna in the right direction, so the feedback loop while you are debugging is tight. Compare that to a water meter in a pit, where a quiet minute tells you nothing.
SCM gives you an odometer, not a speedometer. The value only ever goes up, and consumption is the difference between two readings. That is fine — it is exactly how a utility bills you — but it means your resolution is set by the meter's least significant digit, not by how often you poll. Sampling a slow gas meter every ten seconds gives you a lot of identical readings and one occasional step.
If what you actually want is real-time flow, the meter broadcast is the wrong instrument for it regardless of how good your receiver is.
Confirm it is actually yours
You will decode several meters. Most of them will not be yours, and the strongest signal is very often a neighbour's rather than your own — a gas meter inside a basement behind a foundation wall is at a real disadvantage against one mounted outside next door.
Do not skip this step. Match the broadcast consumption value against the physical dials on your own meter. The full procedure is here, but the short version is: read your dials, read the packets, and the ID whose number matches is yours. Trusting the loudest signal is how people end up graphing their neighbour's heating bill for a month.
Next
Where this leads.