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KeithLuneau

Determine Frequency Without Frequency Counter?

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I've been flying with what I always thought was a 1.2GHz setup like those on eBay. I bought mine from an online retailer that sold mostly computer parts, I forget the name though. They never specified the frequency, and there was no papers or anything with it. It looks just like those on eBay, and has the tuning knob. I've always assumed it was just like them. Now I start looking online, and I saw it advertised at another site as 900MHz. So then I start searching and see it on a few more as 900MHz, but just as many say it's 1.2GHz. There is no brand name on the box, all it says is "Camera Kit 203CA". One intresting note though, is the FCC logo on the box. One would think that if it was in fact 1.2GHz that it wouldnt be FCC certified.

Here's one site that sells it as 900MHz:

http://www.heartlandamerica.com/browse/ite...mera&PIN=42717#

This one says 900-1200MHz:

http://www.monstermarketplace.com/Electron...ing2900a57.html

This one says 1.2GHz:

http://www.diytrade.com/directory/global/b...Min_Camera.html

As you can see the part number doesn't help much, so what I'm asking is, is there a way to distinguish what frequency the transmitter is transmitting on, at least accurate enough to tell if it's 900 or 1200mHz?

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One interesting note though, is the FCC logo on the box. One would think that if it was in fact 1.2GHz that it wouldn't be FCC certified.

The FCC logo means nothing if a valid registration number is not included too. The mfg's of the cheap imported RF modules have no sympathy to our FCC requirements and could care less about them. Many of the eBay/online vendors are the same way and some will even falsely claim these are FCC legal. The bottom line is that the FCC logo is usually there to fool you.

... is there a way to distinguish what frequency the transmitter is transmitting on, at least accurate enough to tell if it's 900 or 1200mHz?

Without a freq counter or spectrum analyzer there is no sure way to know. The method of going by the antenna's element length is not valid with these imports. I've seen some where they totally messed up the lengths because of the "relaxed" quality control.

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