radio frequency remote receiver signal help

[ipbr21054]

Hello looking for some help if i may.
I am looking for something that will display/inform me of the frequency of a car remote when the car remote is operated.
I use 433.92mhz & 868mhz keys.
All the item needs to do is to inform me of the signal being transmitted either on a screen or even by a different coloured led etc.
Red = 433mhz & 868mhz etc etc

Basically i have some key remotes where the writing has faded and i can no longer read the frequency on the key itself.
Hency by pointing the key remote at the little device i will be told what frequency the key is.
Has anyone seen anything along there travels & can supply me with a link or is anybody willing to make me such an item.
Does not need to be fancy etc just as long as i know what the frequency is hence the coloured leds etc.

Thanks very much i am in the uk.

 

[davenn]

Hello looking for some help if i may.
I am looking for something that will display/inform me of the frequency of a car remote when the car remote is operated.
I use 433.92mhz & 868mhz keys.
All the item needs to do is to inform me of the signal being transmitted either on a screen or even by a different coloured led etc.
Red = 433mhz & 868mhz etc etc

Basically i have some key remotes where the writing has faded and i can no longer read the frequency on the key itself.
Hency by pointing the key remote at the little device i will be told what frequency the key is.
Has anyone seen anything along there travels & can supply me with a link or is anybody willing to make me such an item.
Does not need to be fancy etc just as long as i know what the frequency is hence the coloured leds etc.
Thanks very much i am in the uk.

they are called frequency counters

every good radio workshop has one
as an example of different type from desktop to handheld see ....
http://www.cs-sales.net/frco.html

cheers
Dave

 

[Resqueline]

It's not easy to use frequency counters for that application since the output is on in short burst-trains only. I'd suggest building two loosely tuned detector circuits instead.