Strobit Final Shots

Here are the final renderings from POV with the basic personality board installed, along with a 900MHZ antenna.  I’m pretty happy now, looks OK and now will see how accurate this exercise really is when I get prototype boards back.

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Author: Stephen Eaton

Geek at heart. Loves to tinker and find out how things work, which inevitably leads to items in pieces and not working for much longer :)

4 thoughts on “Strobit Final Shots”

  1. Hi,
    I’ve been looking around for a while but haven’t figured it out yet:

    Are you able to tell me please if you use the 900MHz antenna for all three rfm12b modules?

    And do you know of a way to determine the frequency band of a 12b by looking at the module, please?

    Thanks!!

    1. Hi Deanna,

      I was using whip antennas at the appropriate length for 915Mhz as I was using a 915Mhz Module. The modules I initially used for the prototypes were the DIP Version, these have a check-box ticked of which band the module is for, i.e 433, 888 or 915 Mhz. I’m pretty sure the SMD version also has this, but I don’t have one hand at the moment so I can’t check, I’m pretty sure the SMD has it on the underside of the module, so if its soldered in you won’t see it.

      Stephen…

  2. Thank you for that, Stephen – I pried the chip out and it had the boxes ticked.. doh!

    I have found the 900MHz stubby antenna from DealExtreme that you used but my modules are 434s – I was just interested if this is the antenna that you use for the 434s too (I imagine perhaps just with less range.. but I doubt it could be worse than my whips 🙂 )

    Thanks again for your help!

  3. I would look at using a bit of wire at the correct length for 433 this are:

    433 1/4 wave = 164.7mm
    433 1/2 wave = 329.4mm
    433 full wave = 692.7mm

    so using a 1/4 wave is your best bet, as it’s the smallest.

    I think that using the 915 antenna will limit your range. It will should still work though

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