2.4GHz video sending

[Capitol]

I recently fitted a reversing camera and screen to the people carrier. The idea was to use wireless coupling between camera and screen. It failed, as the wireless range was in the region of 10 ft in free air. Anyway with much cursing I hard wired the video in the car and put the wireless bits on one side for further investigation. I found this week, when I checked the transmission frequency of the transmitter that it was putting out 3.69GHz, which I believe is outside the 2,4GHz band. I checked the frequency counter with another sender operating on channel 1 and came up with 4.1GHz, which is in the right ball park. Does anyone have any experience of this type of off frequency problem? The antenna length is 38mm, which seems a bit long but may be based on experience. I can't find any references to people using 2.37GHz for video sending, anyone know otherwise? The unit is Xtal controlled.

[Andy Burns]

Neither of them are remotely close to the 2.4GHz or 5.8GHz sanctioned ISM bands, grey imports using "dodgy" frequencies?

[Brian Gaff]

I wonder if anyone ever checks these and in fact what the out of band frequencies are allocated to. All I do know is that there are now so many items in the band that you can hardly use wifi very far at allany more as the back channel from the device is swamped by the interference from all the others in an area. Brian

[Capitol]

Sorry, error. 2.41GHz.

[tony sayer]

In article , Capitol scribeth thus

Take it your using a rectum speccylyser for those measurements?....

[Capitol]

Hell, I really fouled up that post didn't I? Readings were

2.369GHz and 2.41 GHZ!

[tony sayer]

;!..

I don't suppose we know the country of origin other than the far east and who knows what frequency they might use there?. I do know thy use around 3.65 "ish" Ghz in the states for short range links...

[The Natural Philosopher]

Oddly enough 2.4Ghz is an international standard arrived at by mutual agreement, not enforced by the EU...