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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December 15th, 2010 at 12:05 pm
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!!
December 15th, 2010 at 12:32 pm
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…
December 16th, 2010 at 12:48 pm
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!
December 17th, 2010 at 2:57 pm
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