Mode FLEX

FLEX pager messages.

Group	Pagers
Default frequency	929.6625 MHz
Default sample rate	2 Msps
In the mode list	Pagers, 1600-6400

Step-by-step: Tutorial-FLEX

What FLEX is

FLEX is a faster pager protocol from Motorola (1600 to 6400 bit/s) used alongside POCSAG.

Frequencies and settings

Setting	Value
Start frequency	929.6625 MHz
Tuning range of the mode table	25 to 1000 MHz
Sample rate asked	2 Msps
Lowest working rate	1 Msps
Channel width	25 kHz

OnAir takes any frequency you type; the numbers above are the mode's starting point and the range its table describes. In the app the shortcut label is Pagers, 1600-6400.

What OnAir shows

FLEX paging messages (1600, 3200 and 6400 bit/s) on a 25 kHz channel.

The mode's own tab has these screens: Messages, Statistics. The other tabs (Overview, Receiver, Scan, History) are described on the Main window page.

Tips and caveats

• Checked with generated signals and impairments; recordings of real signals welcome.
• Which radio: Usually yes for narrowband signals: an RTL-SDR tunes roughly 24 MHz to 1.7 GHz at up to about 2.4 Msps. Wide signals such as TV channels need a faster radio, and OnAir says next to the source what the selected radio can do.
• Try it without a radio: most modes include a built-in synthetic test signal, so you can open the screen and try the controls first.
• Receiving and the law: Pager messages can contain private information, and some countries restrict listening to them. Check the rules where you live before you use this mode. See Legal.

Related pages

• Pagers: POCSAG and FLEX
• All modes, Pagers
• Supported radios, Troubleshooting, FAQ
• More in Pagers: POCSAG, Multitone Paging