Dominic,
I'm interested in ASK/FSK Rx/Tx in the 433 MHz band, for automotive key fob and TPM sensor research.
I took a quick look at the ask_tx.grc and gfsk_tx.grc files. Both of them are missing a "ham varicode tx" block, and it wasn't immediately apparent where to find one. Likely it is for PSK31 encoding, but it might be educational for me to transmogrify it to what I need, which would be fixed-length packet ASK/FSK Rx/Tx.
I'm coming up to speed on GNU radio. I've read the entire hackrf-dev mailing list archives to give me a grounding in the historical aspects of what has gone on here before, and I've been twiddling with some of the example flowgraphs in the GNU Radio tutorials and other examples that folks have posted to the list.
I realize that I'm going to have to go through a crash course on Python. I'm an old C hack from years back, and have worked my way through several other languages (FORTRAN, BASIC, Algol, C++, various micro assembly languages, etc., etc. and mostly on embedded 'lights out' platforms) so I'm not tied to a "one true language" philosophy.
Any pointers to helping me get up to speed on narrow-band ASK/FSK remote control sample flow graphs would be appreciated. I'll eventually want to work my way into 900 MHz DSSS based on sub-GHz 802.15.4 (the binary PHY, not the orthogonal stuff everyone is using on 2.4 GHz).
73,
-- Dave, N8SBE
-------- Original Message --------
Subject: Re: [Hackrf-dev] HackRF Transmit
From: Dominic Spill <[email protected]>
Date: Thu, September 24, 2015 1:21 pm
To: Dana Shtun <[email protected]>
Cc: "[email protected]"
<[email protected]>
On 24 September 2015 at 14:20, Dana Shtun <[email protected]> wrote:
> Its a bit of a waste of technology NOT to transmit!
There are definitely HackRF users transmitting in many different bands.
> - there are bands assigned
> for unlicensed low power devices (ISM) that can be used to transmit without
> worrying about licensing.
> 433, 915, etc.... just check your local regulations
These are the bands that I transmit in and are great fun for playing
with off the shelf wireless devices (remote controls, wireless
doorbells, zigbee, etc)
I've also seen DAB transmitted from a HackRF One along with other
broadcast technologies.
> So this is a challenge to the community to help develop the tools and
> interfaces to turn this wonderful technology into a really useful device
> for communication as well as experimentation.
I fully support anyone developing tools that make use of the HackRF
hardware, especially if those tools are open source and can be used by
other HackRF users. I'd love to see any of them
I would also like to encourage anyone who has built GNU Radio
flowgraphs for either transmit or receive to share them, either on
this list or elsewhere online (github, dropbox, pastebin, etc). The
best way for all of us to learn from each other is to share what we
have discovered by experimentation.
A great place to start is here: https://github.com/argilo/sdr-examples
Dominic
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