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.


OpenSpot from the Start

I have spoken to a few people who have felt a bit overwhelmed setting up their OpenSpot from the start. In saying that, I have always been surprised how many people are on digital, some of them have no computer experience at all.  It only takes one tickbox to be selected wrongly and you are off the air totally.  So clearly there are a lot of helpful Amateurs out there.  This website is my way of helping, as I can’t be all over the world to help.  I have put things of interest as I find them on my site.  If you find it interesting, please subscribe or let me know.

In saying that, OpenSpot has been setup to be as easy as possible with a lot of thought behind it.  While I am not claiming this is the best hotspot, I am saying I have two of them and found them great to use at home, mobile, and portable.

This is what I do with my openspot2.

Starting from the beginning

Plug your OpenSpot2 in

Turn your mobile phone wifi (or could use a tablet or laptop with wifi) on and connect to your openSPOT2 AP

If the popup page does not show up (it may take a while to load), type in openspot2.local in a web browser

A welcome screen will ask you to select your country

Scan or manually select your home wifi

Press connect and type in your password for your home wifi

After pressing ok, you will get a message saying this hotspot is going to connect to the wifi now instead of directly connecting to your phone

You can then connect to it via your phone or device that is connected to the home wifi.  I recommend you do this via a pc as you get more functions on screen, however you can do it via a mobile phone with a smaller screen. To connect, go to openspot2.local in a web browser.  However, if you have two openspot2’s on your network, as I do, you will need to log into your network modem and check the actual ip address of your openspot.

If you can not find it on your network, then I suggest you go back to your phone and see if you can connect to your openspot again via wifi.  If it is not there, you may need to unplug the power cord and plug it back in a minute or so later, or press the button next to the power cord until the light goes white to reset it and start again.

Once you connect via the wifi network to your Openspot for the first time you will get a Quick Setup Screen.

Put in your call sign and the DMR ID will auto populate.  You can put in your NXDN ID also.

Select the type of radio you will be using to connect to the OpenSpot.

Type in the frequency you want to use while using the Openspot.  Make sure it is a different frequency to all other hotspots so you don’t get hotspot feedback. Keep colour code as 1. Then select the network you want to connect to.

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My Radio Diddity GD-77

Starting in digital can be a little overwhelming to start with, no matter how many years you have had your licence. I even had a digital scanner for many years prior to starting in the digital world of Amateur Radio.

After working out what digital radio is, what you can do on it and how it worked, I then started researching what equipment was required.

According to other reviews at the time I was looking, many people claimed that the RadioDitty GD-77 was the best value for money.

My Radioditty GD-77 while on holidays
My Radioditty GD-77 while on holidays

After a month or so of using the RadioDitty GD-77 through repeaters, I purchased an OpenSpot2. I did a lot of research prior to this, and had settled on the OpenSpot1, however when I went to purchase it, only the OpenSpot2 details. It happened to be the week it was launched, so there were no reviews available at the time.

Currently my digital setup is very simple, it just has:

  • One hand held radio, the Radio Ditty GD-77, this came with charger, USB cable and remote microphone
  • OpenSpot2 Hotspot. This came with a power cable.

With this simple setup I am able to talk the world via

  • The BrandMeister network
  • The Australian VK-DMR network
  • Other DMR networks around the world, eg New Zealand, Canada etc
  • YSF Reflectors
  • C4FM
  • NXDN Reflectors
  • SharkRF servers

The above is just to name a few networks. Each of the above networks range from a few Talk Groups, to thousands upon thousands of them from all over the world.

In 2019, my family went for a huge five week trip through outback Australia. We went to some of the most remote parts of the world. We had to carry a lot of water, food and supplies. We also had to carry extra battery power to charge fridges etc. I would have liked to have taken a HF radio with us given the outback probably didn’t have a lot of interference, however we simply didn’t have enough room, or power.

Instead we took a very simple setup, my GD-77, my openspot2 and a small battery back that ran my openspot and mobile phone. Even without power, I was able to talk the world with a little mobile reception or wifi.

Many people have many radio’s for different networks, making it hard to keep updated, and obviously cost a lot. My digital setup costed far less than it costed me to get on 2m/70cm many years ago. And did I mention, this radio also does analogue, so yes, you can use this radio on 2m and 70cm simplex or via the repeaters and no one will know you are actually talking on a digital radio.

The only down site is it is a little hard to program and navigate the channels. The radio is built for commercial operations, and not really for amateur radio, however it can be done. Commercial operations usually have a small number of talk groups or repeaters/frequencies, where as amateur radio uses a lot. However once you nut it out, it isn’t really that hard.

You might want to upgrade to the OpenGD-77 though as it is a lot easier. I show you how to do that here.

Other things to read

Here are some other posts I have done on similar topics