using iphone to debug VCO's!

The operation of transmitters designed to jam or block wireless communications is a violation of the Communications Act of 1934, as amended ("Act"). See 47 U.S.C. Sections 301, 302a, 333. The Act prohibits any person from willfully or maliciously interfering with the radio communications of any station licensed or authorized under the Act or operated by the U.S. government. 47 U.S.C. Section 333. The manufacture, importation, sale or offer for sale, including advertising, of devices designed to block or jam wireless transmissions is prohibited. 47 U.S.C. Section 302a(b). Parties in violation of these provisions may be subject to the penalties set out in 47 U.S.C. Sections 501-510. Fines for a first offense can range as high as $11,000 for each violation or imprisonment for up to one year, and the device used may also be seized and forfeited to the U.S. government.

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
User avatar
405nm
 
Posts: 64
Joined: Tue Feb 26, 2008 8:55 pm

using iphone to debug VCO's!

Post by 405nm »

Just thought I'd share a cool trick I've figured over the course of my build. I've just put in the VCO's and PLL (about to start on the amp section) and I wanted to make sure that they were both functioning correctly.

So, I used the field test mode on my iphone.

If you dial *3001#12345#* on the iphone and press "call," it will bring up the field test mode. If you click on "cell information," it will show data about all the nearby towers that the phone can see. The "fq" value next to each one indicates what band it is operating on - if it's between 128 and 251, that tower is operating on the 850MHz band. If the number's between 512 and 810, then the tower is on the 1900MHz band.

I turned on my WB (with primitive antennas) and after a couple of seconds, all the towers disappeared, and were replaced with one having a fq of of 0 - I guess that the phone is seeing the WB as a really messed up tower or something.

This result means that both VCO's are working - if only one or the other was working, then the towers broadcasting on the frequency corresponding to the malfunctioning VCO would not disappear.

WBVenom
 
Posts: 17
Joined: Fri Apr 11, 2008 3:33 am

Post by WBVenom »

Nice! Thanks for the awesome info. I'll certainly be employing a few friends' iPhones soon.

losthorizonmba
 
Posts: 31
Joined: Wed Sep 15, 2010 11:41 pm

Re: using iphone to debug VCO's!

Post by losthorizonmba »

Is this possible only in unlocked/hijacked phones

Locked
Please be positive and constructive with your questions and comments.

Return to “Wave Bubble”