The Ohio Digital Emergency Network ( OHDEN )
The Ohio Digital Emergency Network  ( OHDEN )  

NVIS Day 2017



NVIS Day April 22, 2017   ( 10 AM to 4 PM  Eastern Local Time)


OHDEN plans to participate in the 2017 NVIS Day.  We will monitor the OHDEN frequencies on 40,60,80, and 160 meters for check ins from NVIS experimental stations, County EOCs, CERT units, home station participants, and any of the Anchor Stations. We will also accept over the border checkins for neighboring states to exercise that mode of backup communications with PA, IN, WV, and KY.


Our objective is to test the NVIS communication technique by sending simulated messages ( using FLMSG)  and receiving responses from the State EOC liason station ( W8SGT) to each participant as if we were in a ham radio only messaging situation.


We want to emphasize establishing message quality paths that are good enough to provide error free NBEMS messaging to and from each county in Ohio. If you know of a neighboring county that has no digital presence on OHDEN, it would be a great opportunity to help them out with a portable operation in their county.


Stations are requested to standby for an outgoing message from the SEC at the beginning ( 5- 15 minutes after the hour  ) of each band's time slot.  They then should originate a Priority response routed back to SEC in the format shown on sample ics-213 message template in the file section of this website.  This message will have a  unique message originating number in the originators ICS-213 Time Block. There will also be an accuracy verification string the Position block of the originator.  This needs to be read and pasted into the reply. 


Stations are also encouraged to send their After Action Scoresheets ( Word Text) Summary via OHDEN ROUTINE PRECEDENCE for practice on the weekly net.  These routine messages should be kept until after the drill and  in the content format that the NVIS day sponsors want it but wrapped for FLMSG compatibility.  OHDEN really needs to practice sending more messages and this after action  activity can spread out for several weekly nets if required.


Stations are asked to enable checksums on their Priority Message replies.  If you can not establish a checksum OK transfer, revert to a non checksum attempt and note it in the reply.  Each message reply or relay must receive a QSL / RR from the receiving station.   This is an important step in a real mission reply so we must test that quality during these kind of drills from now on.  Details on checksums can be found in the FLMSG Users manual. Yes they may be prevent one missing character from a NAK, but this is very important serving our agencies.



The template file is called NVIS2017.txt  This is a standard FLMSG ICS-213 circa Version 4.0.2.  file.  Since some downloaders refuse to download odd extent named files, the file needs to be renamed to NVIS2017.213T prior to loading it to FLMSG data folder.


Once you have that  document,  It needs to be placed in the NBEMS/ICS/Template directory of each receiving computer to take advantage of the canned text in the template.  This is not a new html form, just the current standard ICS-213 form that has much of the data already typed in to standardize it and a couple of non standard uses for the data form fields contained in it.




80 meters   ( 10A -12 Noon local)   3585.000 KHz USB Data carrier at 1000 Hz .  Olivia 8-500 mode.  We will also monitor for PSK31 at a waterfall frequency of 2100-2500 Hz during this period for stations without Olivia capability. Stations having difficulty may also call in on 3605.000 USB for voice liason with the net.  Traffic will not be passed on that frequency but it may be used for coordination of digital contacts.



40 meters   ( 1 -4 PM local )   7046.000 USB Data carrier at 1000 Hz .  Olivia 8-500 mode.  We will also monitor for PSK31 at a waterfall frequency of 2100-2500 Hz during this period for stations without Olivia capability. There will be no voice coordination frequency on 40 meters.



60 meters   (10 A -4 PM local )   5403.500 USB Data Voice Coordinartion.  PSK31 RF carrier tone frequency 1500Hz  +/- 250 Hz on USB waterfall.  NOTE:  Latest ARRL band plan limits us to PSK31 or AMTOR operation on 60 meters to preserve Joint Use Agreements with Government Users.  Be careful to put out a clean waterfall signal. This is a new ARRL policy but let's follow it for now and argue for Olivia and other medium bandwidth modes approval later. See


We do not as of now have a NCS scheduled for 60 meters.  Contact NJ8BB ( see OHDEN leadership page) for precoordinating a test on that band.


160 meters   ( 4P  - 9P  local)   1.805. 000 KHz USB Data carrier at 1000 Hz .  Olivia 8-500 mode.  We will also monitor for PSK31 at a waterfall frequency of 2100-2800 Hz during this period for stations without Olivia capability. Voice is permitted anywhere on 160 meters so calling in on USB on this dial VFO frequency is OK.  Note: this band does not open up until around 4 PM this time of year, so any operations are outside the regular drill time window.  OHDEN however will maintain a watch on this frequency until 9P for any stations wanting to check in from home QTH.  Barring severe QRN,  this band has been recently shown to be a good night time solution to the long skip we have been seeing on 80 meters this year and checking it out with a variety of stations would be very much appreciated.  160 meter propogation is more of a ground wave / NVIS mix mode is more well behaved during grey line hours than 80 meters.


73 and have fun on NVIS day.


W5UHQ,   OHDEN Net Manager









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