Tech Staff Meeting Notes August 3, 2012

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

Duty Table updated May 2012


News & Highlights

The Fish Fry will be Friday, August 31, 2012. Cost is $6.

Now that we're more familiar with RT, we need to have another powow on it to better define procedures for using it. Mitch will set a time and date.

Middle TN Station

Chris got the data for the TEMA site but its really close to the interstate. A better option may be the Cedars of Lebanon state park. Chris will go back and test the radio shot (a half mile through the pines).


Short Period & Broadbands

EDIT, NNAR & CHNM: NNAR and CHNM will be redirected to transmit directly to the node instead of through EDIT.

STAM- sporadic dropping out
WADM - sporadic dropping out

Isis Oxidation
KEWM.EHN - see image

Muted Amplitude

Unknown Problem
HENM.HH* - see image
GNAR.HHN and .HHE - see image

Strong Motion down

Arkansas network problems
WLAR - still dropping out
WLAR - strong motion station down

Mag. 4.0 gain range problems
These stations had problems with the gain channel during the Magnituded 4 Missouri event on Feb 21, 2012. It isn't clear to me whether they data channels saturated or whether there was excessive chatter in the gain channel. See image.

Weak Battery/Solar Need to check LVAR.

Jim thinks long period drift on GNAR horizontals could be differential heating and cooling of the vault. This site floods so everything is raised and the vault extends above the surface. An earthen berm was mounded about the top but as since subsided and eroded leaving part of it exposed. Need to rebuild the berm.

NODE Tasks

DBB Check/replace batteries and chargers

MKTA Replace dbb batteries and charger


Jim is getting a quote to replace the muffler, exhaust manifold, and vaporizor solenoid.

Mitch needs to modify env_alarm to monitor the ACFA channel. It is no longer a simple binary on/off voltage but rather contains pulses that indicate the status of the 3-phase AC power input.


G and D and the local EMA installed a 25kW generator to power that side of the building. If there's room power-wise would they let us power the rack from it too? We could share the maintenance of the generator. We'd also have to install a transfer switch.



Twisted pair from Richardson is extremely noisy causing problems with the analog backbone. Richardson is also on the UM 5-year capital improvement plan to be replaced. We got a tour of Wilder and its doable. We need to see if we can get a path to CERI so we know whether we just need to move what's on Richardson now, or whether we need to turn Wilder into an entirely new node (i.e. new mudworm). Then we can get Planning to help us with a design and then we can get permission.
We could just move the firewall from 3904/218 to Wilder and get the DBB on the campus internet that way (if there's no aironet line of site). There are good telephone pairs from from the Wilder roof to the basement and we could move the ceri node/mudworm to the basement. Otherwise we'd have to find and trust connections between the basement and CERI.

We have line of site from the southeast corner of 3904 except there are powerlines in the way. Can we put up a tower on the east side of 3904 to get over the trees and power lines on central?


Ownership, Operation, and Maintenance of the four Charleston, SC stations (C1SC, C2SC, ADSC, and TRSC) was turned over the Univ. of SC at Columbia. At Phillip's request, we letting the data flow through CERI for the time being. Eventually it will get switched to Columbia and the network codes will then change from NM to CO.

RDST, CBHT, and MCAR are coming in via gcf2ew on anssworm. CBHT occassionally loses its connection but is overall, ok. MCAR loses its connection about twice as much so while its mostly functional, it should be better. Worked with RDST IT and its much better now but still has a lot of gaps.

Replace foam rubber plugs at all year 1 stations (need to notch it to accomodate the GPS pods): ASAR, CBHT, CUET, CVTN, HDBT, LNXT, MCAR, NAIT, SFTN & TUMT.

NAIT: Couldn't get the NWS cable modem to cooperate at NAIT (firewall?). Dean was going to ask Comcast about it and maybe get a new modem. Steve will follow up.

CVVA. John contacted DMME again. He's also looking into the possibility of a freewave link to UVA.

We need a single document (access database excel spreadsheet) to document information on all freefield strongmotion stations to include contact(s), current IP's(eternal/external), what ports are allowed in from what IP's here at CERI, telnet yes or no, trigger levels etc. etc.


Need cat5 from AZTN roof to equipment room.

Need cat5 from AZTN roof to equipment room.


Several parts of the new tow (e.g. conduit rack) need to be reworked. On hold til then.


Unknown problem
CPCT.HNE- drifting - see image
BCRT.HHN &HHE - drifting
GRBT.EHN-spikes on channel
CMGA - see image

WSNC - interference spikes- see image
TVNC- interference spikes
RBNC- interference spikes
SMNC - interference spikes
CCNC - interference spikes

Only the DYTN upgrade remains. See map.
Agreement is complete: clear to launch.


BHT move. We may need a written MOU with the Catoosa WMA so John gave them the one we did with TDEC as an example. New site on Pilot Knob Mtn. is about about 9 miles to the E NE. The new location does not have a path to Star Mountain but we do now have hardware for the digital upgrade (a Basalt). John obtained permission to install a repeater at the sheriff's office in Wartburg. Was this where we get internet?


Central Receive: Still have interference from the ham operator. John has an application to for a complaint to FCC that he needs to complete and submit.

TRYN: New tower and building are in place, O.K. to install anytime.

WSNC: Fixed transmitter but had to pull the sensor to repair the E-W channel.

CMGA: need to camp out with a spectrum analyzer to identify the interference. John needs help troubleshooting this one.

MTTN Node ASTN: Change to AC power. We have permission and can install anytime.


We need a better plan for end-to-end O&M of the GPS network in the post JPD era.

MACC is down--probably either a bad antenna or power is out.

I40 Bridge Upgrade

Granites are on a 192 network. Worm is running. Ready to install.

Need to run new cat5 at AZTN.

Need to rebuild comm at both HDAR and HDBT then rebuild hut on aztn roof prior to installation of the granites.

AG Network

WLAR has large latencies and poor internet connection. Something odd is also going on with the Reftek and it may be losing power or cycling. Need a site visit.

X104 is down--needs a site visit to investigate.

X202 needs a new dsl modem.


Chris is looking for suitable bags to protect CMG6TDs during burial. First experiment with a bag under water failed.

What equipment in the FDL is no longer needed. Mitch will call a meeting of FDL users to discuss culling the equipment. Also, the check out/in process is largely ignored--what system could be implemented that people will actually use. Jer Ming is having trouble with some of the old equipment.

We have one bad CMG-6 Should it go Guralp for repair? Who pays for it?


NSMP Station List.


New door locking scheme got delayed.

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