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  1. foTONICS

    sniffing with a sniffer

  2. foTONICS

    sniffing with a sniffer

    My schooling only dealt with a little microwave stuff but none the less it was very interesting. We did a little wave guide stuff but I think our teacher just shoved the lab material down our throats and most of it was lost in the confusion of everything
  3. foTONICS

    sniffing with a sniffer

    To protect the inner conductor I tried to cut some strips of heatshrink tubing, fold them around the tip, then slide another strip of heatshrink around them. This ended up being a terrible idea as once I started heating everything up to shrink it it made a huge mess, became horribly disfigured...
  4. foTONICS

    sniffing with a sniffer

    Once you have the shielding cut away it gets easier. I just used an exacto knife to cut into the dielectric, once I hit the centre conductor I just rolled the cable on the bench so cut all the way around (image 4). Once you make it all the way around it should just slide off with a little effort...
  5. foTONICS

    sniffing with a sniffer

    So the next probe I made was an electric field probe. The engineer that I work with called it a "V-probe". I am assuming that the V stands for voltage but I am unsure, I tried googling it but didn't find any hard evidence. From what he explained, this type of probe has very small gain but it...
  6. foTONICS

    sniffing with a sniffer

    The website I was following suggested the beads to reduce shield current, I'm not sure the impact of what reducing shield current does. If I had to guess I would say something with the frequency response? Anywho, here is the final product. The first picture is the ferrite beads I used (I used...
  7. foTONICS

    sniffing with a sniffer

    So the semi rigid coax and ferrite beads came in, attached are some pictures
  8. foTONICS

    sniffing with a sniffer

    Any input you have is highly welcome. I actually do have a question about the construction of these probes. How sensitive is the dielectric inside the semi rigid coax? Just wondering if I need to be very quick with my work. I'm of course referring to the amount of time I'm applying heat from the...
  9. foTONICS

    sniffing with a sniffer

    Field probes or "sniffers" are used to detect H-fields (magnetic) and E-fields (electric). We have been having issues with failing the 100MHz-150MHz radiated emissions (I maybe wrong with the exact frequencies, I'm just remembering what the engineer told me, I wasn't present for the actual...
  10. foTONICS

    sniffing with a sniffer

    Hey guys, So in my particular line of work we sometimes need to send out equipment for emissions (RF emissions, not exhaust) testing. We borrowed a spectrum analyser but do not have the appropriate loop antennas so we decided to make our own. One of the engineers gave me a little back theory...
  11. foTONICS

    NRF24L01

    ya Steve that was an issue I came across also, I couldn't find any information regarding the IRQ pin itself, only it's function. Also, on my picture I drew I made a mistake adding that ground connection in there between the PIC and NRF
  12. foTONICS

    NRF24L01

    Hey everyone, I've got this NRF24L01 RF wireless transceiver. datasheet -The pin in question is the IRQ which is an active low interrupt pin. -I'm interfacing it with a PIC16f627a uController -The IRQ pin will connect to the PIC's interrupt on change pin (PORTB), when the NRF receives...
  13. foTONICS

    Will this work?

    yes it works perfectly now, and to think I was about to design all this circuitry around something as simple as swapping the leads.
  14. foTONICS

    Will this work?

    thanks a lot! here is a link to my switch:
  15. foTONICS

    Will this work?

    So I have this 12V 20A SPST toggle switch that has a built in LED. Now when I first bought this thing I was under the assumption that the LED only turns on when the switch is in it's 'ON' position, but after looking at the datasheet some more I realized that it's always on, regardless of switch...
  16. foTONICS

    Wireless trigger for LEDs and buzzers

    Just figured maybe you guys would be interested in where I am at so far. Keep in mind that this is full of holes and missing information, so pretty much just a framework of what I basically want it to do. Note also that for now I'm not going to worry about whether or not the receiver and...
  17. foTONICS

    Wireless trigger for LEDs and buzzers

    Hey everyone just a little update: I've haven't been working on this for a while due to time constraints but I'm starting back at it now. I've gotten the hang of bit banging and have even selected the sensor I'm going to use here. I like this one because of the analog output. I'm not sure...
  18. foTONICS

    bit shifting

    so I know that: 6 << 1 will shift 0110 to become 1100. so I have this variable "sPORTA.port" that I will load with data, shift it, then store the data into PORTA. So I want to shift bits one at a time so I tried: sPORTA.port << 1 but that doesn't do anything, so I tried...
  19. foTONICS

    static electricity

    So I'm sitting at my cubicle and I need to work on something, problem is I don't have a connection for my anti-static wristband so I just figured I would connect to the case of my PC. Now I wasn't 100% positive if the case to a PC is grounded so I googled it and came upon this response from...
  20. foTONICS

    Wireless trigger for LEDs and buzzers

    Yes I have a couple actually, I will have to look into that
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