|
Spectrum Analyser from Cell Phones?
I wonder if anyone has successfully converted a
thrown-away cell-phone into a spectrum analyser? We would seem to have all the necessary components in there for free - keyboard, graphical display, post-demodulation DSP, Frequency Synthesizer, RF good up to 1 GHz (2G5Hz if an ex-WCDMA unit) Here would seem to be an opportunity to equip all Radio Hams with a reasonably state-of-the-art piece of test gear, that when coupled with an IF generator would give us all a network analyser into the bargain! |
Polymath wrote: I wonder if anyone has successfully converted a thrown-away cell-phone into a spectrum analyser? We would seem to have all the necessary components in there for free - keyboard, graphical display, post-demodulation DSP, Frequency Synthesizer, RF good up to 1 GHz (2G5Hz if an ex-WCDMA unit) Here would seem to be an opportunity to equip all Radio Hams with a reasonably state-of-the-art piece of test gear, that when coupled with an IF generator would give us all a network analyser into the bargain! Many years ago it was done with junked Video Tape Recorders and, from what I saw and read, very successfully too. Dave |
Dave Holford wrote:
Polymouth wrote: I wonder if anyone has successfully converted a thrown-away cell-phone into a spectrum analyser? We would seem to have all the necessary components in there for free - keyboard, graphical display, post-demodulation DSP, Frequency Synthesizer, RF good up to 1 GHz (2G5Hz if an ex-WCDMA unit) Here would seem to be an opportunity to equip all Radio Hams with a reasonably state-of-the-art piece of test gear, that when coupled with an IF generator would give us all a network analyser into the bargain! Many years ago it was done with junked Video Tape Recorders and, from what I saw and read, very successfully too. Don't hold your breath, as there seems to be a raft of projects ahead of this one: his own XRC machine, an ATU made from discarded CDs, a DSP project using an FT-707, and of course, the mathematical basis for the Big-K approach to DSP to be proved, peer-reviewed, and then published. from Aero Spike |
Spike wrote:
Don't hold your breath, as there seems to be a raft of projects ahead of this one: his own XRC machine, an ATU made from discarded CDs, a DSP project using an FT-707, and of course, the mathematical basis for the Big-K approach to DSP to be proved, peer-reviewed, and then published. You also forget the gauntlet he laid down in the newsgroups to design a transceiver that was roughly based upon re-inventing the wheel. When people took his suggestion somewhat seriously, he backed away, and, as it the case with all Bean-powered projects, let the subject die. |
Polymath wrote:
I wonder if anyone has successfully converted a thrown-away cell-phone into a spectrum analyser? We would seem to have all the necessary components in there for free - keyboard, graphical display, post-demodulation DSP, Frequency Synthesizer, RF good up to 1 GHz (2G5Hz if an ex-WCDMA unit) Here would seem to be an opportunity to equip all Radio Hams with a reasonably state-of-the-art piece of test gear, that when coupled with an IF generator would give us all a network analyser into the bargain! Bargain - of course - that's after the Radio Amateur has equipped his shack with a very expensive SMD rework station.... Would it not be wiser to suggest the building of an interface so the shack PC could be used to do such a task as spectrum analysis? Beanie/Polymath - Once a dumbass, always a dumbass. |
In article . com,
says... I wonder if anyone has successfully converted a thrown-away cell-phone into a spectrum analyser? snippety of preposterous proposal What are you smoking/drinking/injecting? More importantly, why didn't you offer to share? Are you trolling, drunk, high, or actually serious? Inquiring minds want to know. -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute. (Known to some as Bruce Lane, ARS KC7GR, kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" |
Wankel Rotary wrote:
Spike wrote: Don't hold your breath, as there seems to be a raft of projects ahead of this one: his own XRC machine, an ATU made from discarded CDs, a DSP project using an FT-707, and of course, the mathematical basis for the Big-K approach to DSP to be proved, peer-reviewed, and then published. You also forget the gauntlet he laid down in the newsgroups to design a transceiver that was roughly based upon re-inventing the wheel. When people took his suggestion somewhat seriously, he backed away, and, as it the case with all Bean-powered projects, let the subject die. His philosophy seems to boil down to "Don't do as I do, do as I say" - the motto of the hypocrite. from Aero Spike |
Hello Polymath
I wonder if anyone has successfully converted a thrown-away cell-phone into a spectrum analyser? We would seem to have all the necessary components in there for free - keyboard, graphical display, post-demodulation DSP, Frequency Synthesizer, RF good up to 1 GHz (2G5Hz if an ex-WCDMA unit) Here would seem to be an opportunity to equip all Radio Hams with a reasonably state-of-the-art piece of test gear, that when coupled with an IF generator would give us all a network analyser into the bargain! If you have web access, I have built a scalar network analyser from one of the commonly available TV transmitters http://www.g6lvb.com/Articles/NetAn/index.htm. These TV transmitters use the SP5055 2.6GHz I2C frequency synthesisers and are easily programmed from a PIC. You could build yourself a spectrum analyser using the synthesiser as the sweep oscillator as I did. If you successfully reverse engineer a cellphone enough to be able to use any of the parts you describe I am sure that there would be a great deal of interest if you published the information for any particular model. 73, Howard G6LVB |
Many years ago it was done with junked Video
Tape Recorders and, from what I saw and read, very successfully too. If this is the same project that I remember, it's based mostly around the TV tuner module from an old VCR. The TV tuners work real nicely as they have a well-defined interface to the VCO control voltage, mixer in, and mixer out. The VCO is also the "right range" (VHF-Lo, VHF-Hi, UHF covers a lot of frequency!) at least for 50MHz up to the top of the UHF TV band. I don't know what they did for frequencies below 50MHz. The TV tuner module is also nicely interface to (a handful of easily soldered-to pins.) Cellphones don't really have a well-defined module like the TV tuner in them. They aren't broadband in the same way. Their synthesizers are not broadband either. Tim. |
"Howard Long" wrote in message
... Hello Polymath If you successfully reverse engineer a cellphone enough to be able to use any of the parts you describe I am sure that there would be a great deal of interest if you published the information for any particular model. Sweep oscillator on the X axis of an old junk oscilloscope and the IF stage of an old multiband radio always did the job for me, mind you that was until I went to university of course when we found a new use for the spectrum analyser - listening to Radio 1 in the lab mainly. |
All times are GMT +1. The time now is 05:06 AM. |
|
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
RadioBanter.com