Michael Milner wrote:
I just took a look at my car's keyfob with the USRP RFX400 board (it seems
to transmit around 433.923MHz. It is using FSK modulation, a few tens of
kilohertz deviation. It demodulates pretty well, but the centre frequency
isn't very stable (Is there any way to automatical
On 6/6/06, Johnathan Corgan <[EMAIL PROTECTED]> wrote:
. the sequence seems to change with each
key press. See attached JPEG.
I sure hope it changes every time. or you just posted your car keys on-line :-)
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Johnathan Corgan wrote:
> I looked up the FCC ID for mine. It's allocated for use between 314.5
> and 315.5 MHz, which is I'm sure to allow cheap oscillators to be used.
Woah...the FCC search has a "detail" option that comes up with a list of
PDFs describing the whole key fob (URL will wrap I'm
Matt Ettus wrote:
Thanks for looking into this. I think that most keyfobs use SAW
oscillators instead of crystals to save money. This results in very
bad frequency drift, which the receiver will need to compensate for.
Matt
Many of these systems use OOK (On/Off Keying) of the SAW-based
tra
Michael Milner wrote:
After the Wired article today, I've received a couple of email from
people who are concerned that the USRP could be used to clone their
keyfob transmitters for car alarms and garage doors. I'm not concerned,
since there are already many ways to do this (just check the back
> After the Wired article today, I've received a couple of email from
> people who are concerned that the USRP could be used to clone their
> keyfob transmitters for car alarms and garage doors. I'm not concerned,
> since there are already many ways to do this (just check the back of
> pupular sci
On Tuesday 06 June 2006 05:59, Matt Ettus wrote:
> After the Wired article today, I've received a couple of email from
> people who are concerned that the USRP could be used to clone their
> keyfob transmitters for car alarms and garage doors. I'm not concerned,
> since there are already many ways
Matt Ettus wrote:
After the Wired article today, I've received a couple of email from
people who are concerned that the USRP could be used to clone their
keyfob transmitters for car alarms and garage doors. I'm not
concerned, since there are already many ways to do this (just check
the back
After the Wired article today, I've received a couple of email from
people who are concerned that the USRP could be used to clone their
keyfob transmitters for car alarms and garage doors. I'm not concerned,
since there are already many ways to do this (just check the back of
pupular science
