Thread: HELP understanding garmin astro/alpha dog collar frequency work mode

In very simple terms I believe this is what happens when a collar localized to a country [say Croatia] pairs with a German localized device receiving a GPS signal the latter country which uses the same frequency 155.450 MHz (BTW, they are commonly-used frequencies. You'll notice that Slovenia, Poland, UAE, Norway, Lithuania, Cyprus, Czech Republic, Estonia, Finland, Sweden and Slovakia all use 155.450 MHz, & 155.475 MHz too, while Austria, Latvia and Iceland also use 155.450 MHz): The devices may pair only until the tracking device recognizes from a GPS fix that it's in Germany and then will not proceed because, for want of a better expression, it's 'geofenced' by the firmware to only pair continuously within Germany with a collar identifying itself as also being localized German and that's despite the fact a 'foreign' collar is transmitting on a local frequency. What the modified patcher by AlexWhiter does of course is remove that firmware limitation so for example a US Astro/Alpha will work with a US collar anywhere in Europe. What it almost certainly likely doesn't do is allow a US device to receive a signal from an EU collar but it might allow a German device to receive a transmission from a Croatian collar on 155.450 MHz, or a Spanish device to receive from a Swedish collar on 155.450 or 155.475 MHz as examples. I'm only guessing though so perhaps you should ask the question of AlexWhiter in his Astro/Alpha regional limitation patcher thread, or just do your own test as you remarked.

I must say that this kind of chat is probably a little dangerous here and that Garmin would not look kindly on specific help being given which is probably why the author of that other thread isn't prepared to give detailed support.