Decoding Pager Protocol: Motorola Flex1600

Hi All,

I’m just doing a bit of research into decoding the Motorola Flex1600
protocol under Linux and have not had any luck finding anything yet. I’m
wondering whether the gnuradio project might be a good place to start.

I’m currently using PDW under Windows, which seems to work ok, but I
think that having a Windows machine running for just that is a bit
silly. I tried running it under vmware, but it was doing something to
the serial port – not allowing CTS through, buffering the port, or
something like that.

Anyway, I have a scanner tapped with the discriminator output plugged
into a 2 level data slicer. I’m on a fairly tight budget, so I’d like to
get it working with that before looking at anything else.

Is this possible with gnuradio? If so, can someone please give me a
pointer as to where to get started?

Thanks
Darryl

Darryl R. wrote:

Anyway, I have a scanner tapped with the discriminator output plugged
into a 2 level data slicer. I’m on a fairly tight budget, so I’d like to
get it working with that before looking at anything else.

Hi Darryl;

I’ve been waiting YEARS from someone to write a Linux serial port driver
extension to support a slicer.

-rick

Darryl R. wrote:

I’m just doing a bit of research into decoding the Motorola Flex1600
protocol under Linux and have not had any luck finding anything yet. I’m
wondering whether the gnuradio project might be a good place to start.

There is an implementation of FLEX in the gr-pager component of GNU
Radio in the SVN trunk. The example app assembles a receive chain for a
USRP with a DBS Rx board, but you could create a separate receive chain
that uses the sound card to supply the audio signal instead of the FM
demodulation block that is currently used.

Anyway, I have a scanner tapped with the discriminator output plugged
into a 2 level data slicer. I’m on a fairly tight budget, so I’d like to
get it working with that before looking at anything else.

You wouldn’t need the slicer, that’s done in software, so just pipe the
discriminator tap to the sound card. This also lets you get both the 2-
and 4-level transmissions, at either 1600 or 3200 baud.

Is this possible with gnuradio? If so, can someone please give me a
pointer as to where to get started?

http://gnuradio.org/trac

Johnathan C., AE6HO
[email protected]

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