Hotspot Fixing Packet Loss with AutoCal

The thing with digital communications, it can be extremely complicated. It only takes one tick box to be ticked incorrectly to take your station off the air.  Just as easily one tick box will get you on the air and sounding great.

With Analogue, it was all about antenna gain, SWA, power and height.  Digital is vastly different, especially via a hotspot, as it is all about lack of power, mic gain and packet loss.  Packet loss can be tricky and is often put down to a bad internet connection.  However, that is not always the reason, and if your internet is good, and your packet loss is above 1%, then it can get tricky to know why.

Assuming you have a good connection, you have your hotspot close to your modem if it is via wifi and your radio is also close to your hotspot, then here is something you may want to try.  I will explain how to do it using an OpenSpot, as that is what I am using, however, most hotspots may have the same or similar features.

After many years of using the same hotspot, I noticed more and more the hotspot didn’t seem to recognise my signal from my radio.  I could hear fine, and my hotspot even said it was receiving my signal, but my call didn’t come up on the dashboard and the other person couldn’t receive my signal unless it did come up on the dashboard.

It started 3 in 1 times I would trigger the hotspot like normal, then it changed to 1 in 3.  It got worse before it made the hotspot almost unusable.

My hotspot, an OpenSpot2, has a AutoCal option and will analyse an incoming signal and tries to find out the frequency difference between the OpenSpot and the transmitter. They suggest that you only run AutoCal feature if the openSPOT2 shows BER above 1% for your radio’s transmission, as errors in the voice stream usually won’t be noticeable if the BER is below 1%.

You can see this on the OpenSpot by going to the Status screen and open the BER graph and transmit. A quicker way is to look when you transmit on the dashboard of your OpenSpot, you can see below the BER is next to the B, and this example has a loss of 1.3%.

Dashboard showing BER loss.

With the Openspot, press the quick setup button, select the type of radio you are using (I am using a DMR radio), and then you can see the AutoCal button.

All you need to do is press that AutoCal button.  Then scroll down and you will see it doing the three phases. Make sure the correct modem mode is selected. Hold the PTT button on your radio until all 3 phases are completed. Once complete, you can try the echo test to check you are working well.

Then you can return to normal use and the BER should have reduced to well below 1%.

OpenSpot have more information here in their user manual.

I hope this helped you, and if you enjoyed it, here are some other posts I have done. Please don’t forget to put your email address in to make sure you get the latest posts.


16 thoughts on “Hotspot Fixing Packet Loss with AutoCal

  1. dieterpelz October 10, 2020 / 12:22 am

    Good article. Thanks. Now I have even more reasons not to buy a hotspot 🙂
    Dieter, VK3FFB


    • Ben October 16, 2020 / 10:13 pm

      Ha. There are looks of good things about hotspots. Thanks for your comment mate.


      • dieterpelz October 16, 2020 / 10:21 pm

        Hi Ben. Openspot is quite costly. If I get one, I need to be sure, I can handle it 🙂


      • Ben October 16, 2020 / 10:23 pm

        Yes the latest version is very costly and I’m not sure I would. There are lots of options out there. Do you have a friend nearby with an alternative that will help you set it up?


      • dieterpelz October 16, 2020 / 10:26 pm

        Unfortunately not. My main problem is probably that I am not good at doing “try this, try that” when problem solving 🙂


      • Ben October 16, 2020 / 10:27 pm

        If you live near me in VK3 land then I can help but really only know the openspot2


      • dieterpelz October 16, 2020 / 10:28 pm

        Thanks Ben. I am in Heathmont near Ringwood/Boronia.


      • Ben October 16, 2020 / 10:29 pm

        There maybe lots of YouTube videos on the one you want also. I did a lot of research on website and YouTube


    • Ben October 16, 2020 / 10:17 pm

      I have two openspot2 and very happy with them. You have to remember with hotspots they do not have the range of a repeater, however they are a personal hotspot that you can connect to any talk group you want without tying it up so others can not use it

      Liked by 1 person

      • dieterpelz October 16, 2020 / 10:27 pm

        Which dealer sells Openspots in VK ?


      • Ben October 17, 2020 / 5:40 am

        My understanding is you can only buy it direct. Please don’t hear that I am pushing the OS. It is just the one I have. The os3 is very expensive compared to the OS2 and would have to think if I was willing to pay that much. It does mean you don’t need as many radios, as in the DMR radio can be used and the hotspot will cross band to other modes. The Breinmaster system is by far more popular than some others and in Australia if you don’t have a hotspot you are limited on that network. Start just on one network and then expand as you get more confident.


      • dieterpelz October 17, 2020 / 5:42 am

        Yeah, thanks. it is mostly pressure from overseas friends and not so much real interest on my behalf 🙂


      • Ben October 17, 2020 / 5:52 am

        Ah. Very good. Enjoy the hobby mate. Will have to chat on the air!


  2. Ben October 16, 2020 / 10:19 pm

    Let me know if I can help mate. Happy to help as I can.


  3. Ben October 16, 2020 / 10:20 pm

    The issue with openspot’s is the cost but they are easy. I probably wouldn’t pay the $ for the current model.


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