Tech Staff Meeting Notes March 5, 2018

The top priority is always repair of down stations.
NM problem stations
ET problem stations

Duty Table updated October 2017


News & Highlights

NetOpsIX is March 20-21. James, Steve, and Mitch will attend.

There will be a GPS week rollover (max week count exceeds 1024) in April 2019. Some of our clocks may be affects. Dave Wilson at ASL is taking the lead to contact vendors for information on expected behavior.


SIS areas of responsibility

Make sure Mitch gets an email for any equipment change that will generate a SIS update. Philip Crotwell has an app that let's you do updates on your phone.

We've been inconsistent with portables in SIS. The data do not go to IRIS but arrivals do go to Comcat. Should the metadata be in SIS or not? Answer: While metadata for portables is allowed to be in SIS, its not required.


Bob Herrmann used data from the AK M7.9 earthquake to check strongmotion metadata and found a couple problems. All issues were addressed. CLTN was tricky because it was correct in SIS but not at IRIS even though IRIS updates from SIS--it required a republish. Herrmann's notes

Ten node PC's were purchased and are in house. Nine are assembled and one has a bad memory module. Steve and James are working on configuration details. These will be added to existing PC's and the existing PC's will then only digitize analog channels. The new PC's will do everything else.


Data taken from:


Misc Problems
HDAR.HHE.NM.20 see image
HDAR.HHN.NM.20 see image

No connection to GILT. They have a new ISP but say we should be able to connect with the configs we're using. James found a work around using a vpn and so far its working well.

There are 7 ISIS3 upgrades to do in 2018.

I40 Bridge comms.
Received radios for some links. Need to reestablish contacts with law school and get that link going. Need to get a firewall for aztnworm.

Granite HD4 is in the shop. Steve ordered new flash.

NODE Tasks



Purhased ten new receivers to fix the analog glitches.



Need to tune the NMAD node receivers (its been a couple decades). In progress.

AZTN/HDBR: Need to pull the 200' sensor at the weigh station. Probable water damage. There is no budget for this. Should we try to repair the sensor at MPHB and put it at HDAR2 (MPHB is over two decades old, possibly closer to three)? Should we turn off the HDAR2.*.20 channels until the sensor can be replaced?


Flooding in the expansion space has become a problem. We gave up on p-plant and are fixing this ourselves. The retention wall is finished and it now needs a sump pump.


GFM and DSNC have polarity reversals. These were affected by the ISIS4 bug but had their canisters replaced last year. Jim reports that the data at GFM was fixed after the canister replacement on Nov 15, 2016. See additional notes.

Replacement station for GTTN and RBNC being evaluated and permissioned for Southern Highlands Science Learning Center at Purchase Knob (MaggieValley), a part of the Great Smoky Mountains National Park. John found a possible new site with line of site to English Mountain. Need to see what resources are on the Mountain.

Need to remove antennas, coax, and any other hardware from the tower at Greentop. John and Chris will schedule a trip.


Data taken from:


Misc Problems
SHTN - timing problem
FPAL.HN* - drifting?

Polarity reversed
Example from Nov 13, 2017
Example from Dec 3, 2017


Move PMTN due to excessive noise and vandalism. The trees at Lone Mountian are too tall to get a signal out. Looking for an alternate site.


New plan for GFM is to keep it at existing location and convert to digital with a trillium compact which enables using the existing vault thereby minimizing the amount of hardware and supplies that need to be hiked in. The first test of the digital link between GFM and hpnc was unsuccessful but this needs to be repeated with a pop-up antenna when a larger crew is available.


WMTN pit needs to be moved due to erosion.


Need to add solar to PTGV and STLE.

TN Department of Corrections owns 640 acres at SCCF in Clifton in central TN with possible locations for the new GPS station. But none of the potential sites are perfect so Bob needs to visit and decide which spot is best. But Bob is in Buenos Aires so it will need to wait til June. The agreement can be initiated in the interim and TDOC would like to combine this agreement with the one for NWCC which has expired. (Note the seisnet agreement is from 2008 and has no expiration).

AG Network

Z41A has a poor connection with AT&T. Can we switch to Verizon?

We should replace obsolete routers at all AG stations. The ubiquitis are good but run hot and are power hogs. They are behind the AR network firewall.

HHAR needs a bigger solar regulator. The new one should last a year.


The FDL wiki is here:


The seisnet group on umdrive is at You will need your uuid and password.

The seisnet wiki is at You will need your uuid and password.