Oregon Emergency HF Net

The OEN (Oregon Emergency Net) rolls at 6:00 PM and 7:00 PM every evening on 3980 kHz, LSB.

Oregon Section District 1 NTS (National Traffic System) nets run as follows:

  • Daily at 5:30 PM - 3990 kHz - Oregon ARES Traffic Net
  • Daily at 5:45 PM - 3920 kHz - Beaver State Net
  • Daily at 6:30 PM - 3569 kHz - Oregon Section Net/1
  • Daily at 10:00 PM - 3569 kHz - Oregon Section Net/2

Emergency Frequency Usage

Section wide coverage during an emergency is normally maintained using frequencies on 75 or 40 meter side-band. While nets, whether HF or above, typically operate on known frequencies they do not “own” the frequency and may be found up or down the band a few kHz.

The Net Control operator on duty will decide whether to keep the net on its current frequency, or to move up or down a few kHz to avoid interference. However, if it becomes desirable to move the net to another band, the Net Manager and SEC on duty at the time decides whether to move the net and if so, to what band, frequency, and mode. The manager, after consulting with the SEC, may also opt for running simultaneous sessions on two bands at once.

Section HF net frequencies may be used in an emergency at any time by ARES members or officials consistent with other emergency communications that may be in progress on the frequency. Use of the net frequency is not the same thing as establishing an emergency net. When a local or District ARES official begins emergency use of an HF frequency, the SEC and Net Manager should be notified immediately by radio or landline. The SEC may, or may not, designate an ad hoc net as an emergency circuit at his/her discretion. The SEC or his designee will promptly notify the Section Manager, Net Manager and STM of any formal activation of the Section Emergency net on an NTS net frequency.

NOAA Space Weather Scales

The NOAA Space Weather Scales were introduced as a way to communicate to the general public the current and future space weather conditions and their possible effects on people and systems. Many of the SWPC products describe the space environment, but few have described the effects that can be experienced as the result of environmental disturbances. These scales are useful to those who are interested in space weather effects. The scales describe the environmental disturbances for three event types: geomagnetic storms, solar radiation storms, and radio blackouts. The scales have numbered levels, analogous to hurricanes, tornadoes, and earthquakes that convey severity. They list possible effects at each level. They also show how often such events happen, and give a measure of the intensity of the physical causes.

Radio Blackouts

ScaleDescriptionEffectPhysical measureAverage Frequency
(1 cycle = 11 years)
R 5 Extreme

HF Radio: Complete HF (high frequency) radio blackout on the entire sunlit side of the Earth lasting for a number of hours. This results in no HF radio contact with mariners and en route aviators in this sector.

Navigation: Low-frequency navigation signals used by maritime and general aviation systems experience outages on the sunlit side of the Earth for many hours, causing loss in positioning. Increased satellite navigation errors in positioning for several hours on the sunlit side of Earth, which may spread into the night side.

(2 x 10-3)
Less than 1 per cycle
R 4 Severe

HF Radio: HF radio communication blackout on most of the sunlit side of Earth for one to two hours. HF radio contact lost during this time.

Navigation: Outages of low-frequency navigation signals cause increased error in positioning for one to two hours. Minor disruptions of satellite navigation possible on the sunlit side of Earth.

8 per cycle
(8 days per cycle)
R 3 Strong

HF Radio: Wide area blackout of HF radio communication, loss of radio contact for about an hour on sunlit side of Earth.

Navigation: Low-frequency navigation signals degraded for about an hour.

175 per cycle
(140 days per cycle)
R 2 Moderate

HF Radio: Limited blackout of HF radio communication on sunlit side, loss of radio contact for tens of minutes.

Navigation: Degradation of low-frequency navigation signals for tens of minutes.

(5 x 10-5)
350 per cycle
(300 days per cycle)
R 1 Minor

HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.

Navigation: Low-frequency navigation signals degraded for brief intervals.

2000 per cycle
(950 days per cycle)