Hi,

I want to understand how works garmin astro alpha devices radio communication between the handheld and collar devices. I have repaired some collars and i know that there are different country collars. For example here we can see a list:

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Likewise say there some collar use frecuency 155.450, 155.475, 154.600...

My question is, how we say to the collar to use one frequency or other? Its by software or hardware? I think the software its the same for all collar (usa, spanish, france, australian...) and its by hardware but if we change id of the collar from handheld we can switch some frequencies.

Do you think that we can convert a USA collar to SPANISH for example?

And other question, i have a collar that looks swedish (dc 40s) and i tested with a frequency meter that its sending data trought 155.475 (same frequency as spanish) but i cant track it with spanish handheld. Why?

If anyone can help me...

Thank you very much and sorry for mu bad english..