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Hop Frequencies


Norwester Sep 15, 2019 02:38 PM

Hello,

I was wondering if anyone could supply me with a table that shows the frequency ranges of the 0-6 hop sequences for:

RF401

RF430

RF401A

RF407

I'm assuming that 401-401a-430 will all share a common table, as they are all compatible, but I would like to make sure.  We are trying to avoid traffic on certian frequencies in a mine, that are already in heavy uses.

Thanks,


JDavis Sep 16, 2019 09:25 AM

Whatever you do, reducing Maximum Packet size to 250 on all the dataloggers can help when there is interference.

The hop sequence will jump between all available frequencies. If other spread spectrum radios exist in the area, different hop sequences might help. You just have to try each one to find which works best.

The RF407 and RF451 radios have channel mask settings that can be used to disable certain problem frequencies. The older RF401/RF401A/RF430 radios do not have tha ability. 


Norwester Sep 16, 2019 05:39 PM

Hello JDavis,

Thank you for the advice. The packet sizes were already set to 250 on all data loggers. Interference is not necessarily the issue. All wireless devices on the site I am currently working on have to be approved by a telecom department. They have recently let me know that their autonomous haul trucks are using some of the spectrum around 918 (I don’t have the exact range in front of me). I have been told we are no longer allowed to use any radio’s that will range onto the AH specified frequencies. So do you know where I can find literature on using the channel mask settings? The 407 manual does not dive very deep into the subject.

My current Radio channel Mask is set to FFFFFFFFFFF7FFFF
I understand that 910 is blocked by default , but I do not understand how “7” could achieve this as by my math that would be in the 920 range.


JDavis Sep 17, 2019 11:28 AM

It is a big endian 64 bit integer. The default mask has channel bit 19 off. The lowest bit is channel 0. Bit 0 is 902.4Mhz, and spacing is 0.4Mhz.

19*0.4Mhz + 902.4Mhz = 910 Mhz


Norwester Sep 17, 2019 02:14 PM

Thanks JDavis! I think I got it.

I was reading it the opposite way (little endian? or just bad conversion)

so if I were looking to remove (inclusive) 919.6 to 918.4 it would look like this:

"FFFFF0FFFFF7FFFF"

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