Monthly Archives: August 2014

Quick Fix for ProMark 3, ProMark 120, 220 (100 & 200) and MobileMapper 120 (100) External Antenna Cables

There seems to be an endemic number of failing external antenna cables for these devices. You will know that you have a bad cable because the antenna will be detected, then not detected, then detected, then not detected. Shaking the cable results in more intermittent connections.

In many cases, the issue is pretty simple to fix. It turns out that it is not the cable, but the ground connection on the TNC connector is not making contact on the antenna side. (I know this is hard to believe, but I have seen a lot of this lately and I believe it to be endemic.)

Here is what you need to do:

Bend out the ground connectors

Bend out the ground connectors

Take a pen knife (or toad stabber as we call them here in Utah) and bend out the six ground connectors on the inside of the TNC connector, just a little (perhaps 2 mm). Of course, you should be careful to not stick your self with the toad stabber, because you are not a toad.

That is it. I have found that this fixes at least half of the errant cables. And the fix seems to last forever.

If you really do have a bad cable, you can purchase a new factory cable [ 702058 ] but this cable [ IG702058 ] (that we build here at iGage) seems to last longer and not pull out of the receiver when it rotates around the receiver body.

Stay grounded my friends!  Mark


Filed under MM100 - PM100 - PM200, PM3

Using UNAVCO Real-Time CORS Data, a No-Cost Positioning Resource

UNAVCO is a non-profit consortium of Universities that coordinates the collection and dissemination of geographic information. One of the data products that they provide for research and commercial use is a network of 375 real-time continuously operating reference stations (Real-Time CORS) spread throughout North America.

The 375 real-time CORS stations are a subset of the 1,324 PBO references stations and cover the California, Oregon and Washington fairly well:

Real-Time PBO Sites

Access to streams is available via the internet using standard NTRIP protocol at no charge by simply requesting an account via email from

Once you have User Name and a Password, you will probably be at a loss for how to use this resource in your everyday survey activities.

This application note might help you place the data into a reference frame that you can use.

Click [ UNAVCO_RealTimeData ] to continue reading…

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