Quick determination of RF output? (car remote)

[DaveC]

I've heard of a quick way to check IR remotes: put an phototrans. in an
oscilloscope input and use it to check for IR transmisison.

Any suggestions of a similar quick determination of RF output from a common
car remote control?

Clifford IntelliGuard 200 alarm + "glass break" sensor option.

Thanks,
--
Dave C
dave-usenet3016@mailblocks.com

 

[Sofie]

Dave C:
A small coil (several turns) of wire...... both ends hooked to a scope probe
and ground lead.... observe waveform on a wide enough bandwidth scope.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
------------------------------



"DaveC" <dave-usenet3016@mailblocks.com> wrote in message
news:0001HW.BB4F08B20014C546F0386600@news.individual.net...

I've heard of a quick way to check IR remotes: put an phototrans. in an
oscilloscope input and use it to check for IR transmisison.

Any suggestions of a similar quick determination of RF output from a
common
car remote control?

Clifford IntelliGuard 200 alarm + "glass break" sensor option.

Thanks,
--
Dave C
dave-usenet3016@mailblocks.com

 

[DaveC]

On Thu, 31 Jul 2003 18:10:28 -0700, Sofie wrote
(in message <vijfhpl7l9ft38@corp.supernews.com&gt:

Dave C:
A small coil (several turns) of wire...... both ends hooked to a scope probe
and ground lead.... observe waveform on a wide enough bandwidth scope.

Thanks.

I should have mentioned that I only have a 20 MHz scope.

Any tricks to look at an unknown frequency signal just to get an idea if it's
transmitting using a modest scope?

Thanks,
--
Dave C
dave-usenet3016@mailblocks.com

 

[Sofie]

DaveC:
Even a 20MHz scope will produce some response at a higher frequency but of
course it will be at a lower level because it is outside of the calibrated
specified bandwidth. I have a 100MHz scope that I regularly use to check
my Ham Radio equipment at 144 MHz and 220 MHz.
Give it a try...... if you can see some kind of waveform when you key the
transmitter then I would guess that it is working..... or at least putting
out energy..... of course the digital coding or frequency could be
incorrect due to other faults in the car remote circuitry.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
----------------------------------


"DaveC" <dave-usenet3016@mailblocks.com> wrote in message
news:0001HW.BB4F3FBF00196AE6F0386600@news.individual.net...

On Thu, 31 Jul 2003 18:10:28 -0700, Sofie wrote
(in message <vijfhpl7l9ft38@corp.supernews.com&gt:

Dave C:
A small coil (several turns) of wire...... both ends hooked to a scope
probe
and ground lead.... observe waveform on a wide enough bandwidth scope.

Thanks.

I should have mentioned that I only have a 20 MHz scope.

Any tricks to look at an unknown frequency signal just to get an idea if
it's
transmitting using a modest scope?

Thanks,
--
Dave C
dave-usenet3016@mailblocks.com

 

[CWatters]

"DaveC" <dave-usenet3016@mailblocks.com> wrote in message
news:0001HW.BB4F08B20014C546F0386600@news.individual.net...

I've heard of a quick way to check IR remotes: put an phototrans. in an
oscilloscope input and use it to check for IR transmisison.

or point it at your web cam/video cam - which typically can see bright IR
sources.