LS, T2, 401BT Wi-Fi

[Grant Nevill]

When powering up or charging the Javad hardware, I loose Wi-Fi connectivity to other devices connected to the network. Three cell phones and the three computers experience disruptions which require multiple attempts by each device to regain connection and only after all of the survey equipment has been powered down or removed from charging status.

Has anyone else experienced this situation?

The Wi-Fi router is a middle of the road Cisco model that has no problems adding family / friends phones and laptops when visiting, yet seems to be a reoccurring issue when updating J-field, charging, or simply powering up the LS.

 

[Kelly Bellis]

Grant, let me do some digging as this is the first report of such behavior that I've heard where the LS is actually disrupting (by the sounds of it) your Cisco router's communications with your other WiFi enabled devices. Please provide the model number of the router.

In the mean time, here are a few things for you to try.

1. Update the firmware on your router.
2. Check with Cisco support; this may not be their problem, but they may have heard of this issue and know what's best in remedying it.
3. Swap out the router with a Belkin or some other.
4. Call Michael Glutting.

 

[Grant Nevill]

Kelly- Thank you for the reply. It is a Cisco / Linksys EA3500.

In reply to your suggestions:

1. I have updated the firmware and then started fresh with default settings other than changing passwords. - All devices connect fine, until the LS is powered up and then it is hit or miss on connection of phones and laptops.

2. Looked over the FAQ / info database and it might be a solution to assign MAC addresses for supported devices, yet it does not seem it should be necessary.

3. Can attempt to hook up an old router, but it was replaced due to other issues so it might just be time to update with a new router.

4. Have thought about giving a call to Michael as he has helped with previous field connection issues early in the hardware / firmware development.

I was just curious if any others have had a similar issue.

Thanks again.

 

[Kelly Bellis]

You are welcome.

I have joined the Cisco Community, posted a question there and am awaiting their response. I've also posted this question to my youngest son who's more knowledgeable about IT and networks than his father. We'll see what they might add to this conversation beyond my guessing.

On the face of things, it seems that the router is being dynamically reset when the LS scans for available networks. The thing that is like a little bonus mystery, why would the LS be scanning when it's being charged? ... You never stated clearly, and likely I've misunderstood, but is it the charging of the LS or is it the charging of the HPT401BT that is related to WiFi network havoc?

Worth your study perhaps:
http://kb.linksys.com/Linksys/ukp.a...&pid=80&respid=0&snid=2&dispid=0&cpage=search

 

[Matt Johnson]

When powering up or charging the Javad hardware, I loose Wi-Fi connectivity to other devices connected to the network.

Are you saying when the LS or T2 is simply charging and not powered on that you have this problem?

 

[Grant Nevill]

You are welcome.

I have joined the Cisco Community, posted a question there and am awaiting their response. I've also posted this question to my youngest son who's more knowledgeable about IT and networks than his father. We'll see what they might add to this conversation beyond my guessing.

On the face of things, it seems that the router is being dynamically reset when the LS scans for available networks. The thing that is like a little bonus mystery, why would the LS be scanning when it's being charged? ... You never stated clearly, and likely I've misunderstood, but is it the charging of the LS or is it the charging of the HPT401BT that is related to WiFi network havoc?

Worth your study perhaps:
http://kb.linksys.com/Linksys/ukp.a...&pid=80&respid=0&snid=2&dispid=0&cpage=search

Thanks again for a quick reply.

I think the T2 can be eliminated from the discussion as it has been powered up and charged now separately from the LS and 401BT without disruption to the connections.

The 401BT was being charged close to the router and the 401 seems to power up when being charged. When turning off the 401 and disconnecting from its power supply a few reconnection attempts by the mobile and laptop devices they will connect. I will move the 401 charging location to more than 15' from the router and see if that prevents problems.

The LS is similar to the 401, in that it seems to "power up" when it gets connected to charge- I power it off after connection to the charger. I connected via WiFi tonight and downloaded updates with the LS about 40' from the router and have not had any issues with my laptop or phone at similar distances.

Will notify if the connectivity issues continue.

Grant

 

[Kelly Bellis]

Hi Grant,

Sounds like you are able to work around the issue - this is a good thing!

Still, it would be interesting to see how close to the Cisco router your various WiFi devices have to be located in order to witness the havoc being wrought onto your network. FWIW, I have a tablet, laptop and the Javad equipment all generally within 3 to 5 feet of my Belkin router and haven't seen the issue you've described.

Despite it being linked from and listed on the HPT401_Read_thisFirst.pdf, I'm unable to find the document referred to as the Operator's Manual including listings under the webpage titled Publications. Hopefully, somebody who has a copy of it will attach it here in this thread or provide a link to it.

The HPT401BT Datasheet available at http://javad.com/downloads/javadgnss/sheets/HPT401BT_Datasheet.pdf doesn't provide details about charging and when I received the HPT401BT in June (as a separate shipment and not part of my original complete RTK system), it did not have any printed materials. Therefore, the following is only based upon my own personal observations and hopefully anybody will correct me if this understanding is false. Because the radio is integrally tied to its battery, the charger performs as both a power source for the radio as well as a charger for the battery. Once connected, the battery begins being replenished while showing the green power LED pulsing indicating that a charge is being taken. Once fully charged, the green LED will glow without pulsing. About 10 seconds after the power supply has been connected, regardless of the state of the battery's charge, the Bluetooth blue LED will illuminate, and in the specific case of the HPT401BT, it will steadily glow indicating that it is actively scanning for available Bluetooth devices. So, in affirmation with what you said, the HPT401BT is powered up and on anytime it's plugged into the power supply, regardless of its charge status. This is why it is important to always have the antenna attached to the radio as a precaution against the event the radio receives communications from a nearby device.

As for your statement about the LS seeming to power up, I'm still unclear as to what makes you think this. The (4) LEDs displayed on the Triumph-LS when it is powered off have a different meaning than when the unit is powered on. This is discussed in the manual:

If you care to, could you please describe what makes you think that the Triumph-LS seems to be powered on when it has been turned off and is being charged?

 

[Grant Nevill]

Thank you Kelly for the reply.

Did an experiment overnight with the 401BT charging and the LS and T2 charging and powered off. All equipment about 5-6' from the Linksys router. This morning I disconnected the LS and T2 from charging and left the 401BT connected. The TV and game console connected to the WiFi source no problem, while the two iPhone 6s could not connect to the network. I then disconnected the 401BT from charging and was able to receive the WiFi on the phones. Tonight will move the 401BT to about 15'-20' from the router to charge and see how that goes. Will try the laptop connection at that time as well. We have been looking at a new wireless router and that might be the solution.

As stated previously, I was just interested in seeing if any others had a similar experience. It could be that it is some anomaly with the router.

On the 401BT: I have read the various reference material and similar to your experience, have learned from about its charging behavior and other attributes from personal observations. As a general rule any radio device should have the antenna attached when the unit could be powered and especially when charging (learned this lesson 15 years ago with a $3k radio board penalty) - this is why the 401BT I have never has the antenna removed due to the possibility the power button could be pressed inadvertently.

On the LS: Yes aware of the LED indicators, yet was unsure if any of the communication boards might be "powered" during the charging process, despite the unit being off in an attempt to isolate the possible WiFi interference.

Thanks again for your input.

Grant