Hi Tyler, Yes, the HF radars around the Pacific are quite strong here on the west coast of California. When I was in Hong Kong, we heard a 50kHz and 100kHz bandwidth radar that visited 40 metres for hours on end... sometimes S9+60dB... and we all knew where it was coming from. The 2o metre example I posted earlier probably wasn't JORN... it didn't have JORN's characteristic centre-of-sweep unmodulated CW that immediately precedes the usual JORN sweep. Your videos and commentary on the radars are quite informative. Please keep up the good work. A lot of the west coast CODAR / Seasondes that were in and near the 5 MHz ham band have moved down to 4 MHz recently. There were a couple of CODARs on Oahu that covered the 27MHz CB band near Honolulu.
Here is a one minute waterfall HF spectrum snapshot of a few minutes ago, Saturday morning here in California. Some of the signals annotated: coastal ocean radars (CODAR) and HF radars (RADAR) and IONOSONDEs.
Why not use the feature on the kiwiSDR's to triangulate the source Time of flight is very exact if the kiwisdr is GPS trained that way we know exactly which megalith is responsible. Don't just blame a place near Hong Kong, Australia has one of these monsters in Darwin that pollutes our bands here in New Zealand Zl2TUD
Thank you for this post, learned al lot. Like your QRZ page too! Many Ham complain about the QRM caused by radar and other digital stuf on HF. Maybe it is time to step out our comfort zone and invest more in real filters and DSP. When we can guarantee communication during/after disasters why not now? Keep posting, it shows what we can learn.
You're right, it works quite well, especially when you have an effective geometry of stations available. Please feel free to post your TDoA exposé on all the government HF radar locations. Some who already know, would rather not post such info on a public forum.
For those on the OR central coast the local CODAR sites are WLD2 off Beachside State Park operating at 12.233 MHz (forgot exact freq) and YHS2, operating on 13.443 MHz off Yaquina Head. Both run about 40 W with an omnidirectional antenna and are under the auspices of Oregon State University's College of Earth, Ocean and Atmospheric Sciences. (info for K7FD up in Seal Rock). WLD2 is 3 miles N of me. Also WSH1 off Washburne State Park just N of Heceta Head LH although it had been off the air awhile back. I've not experienced any interference from WLD2 but certainly can hear it!!!
On the Wikipedia entry, for visual representation of what CODAR is or looks like on a waterfall, the CODAR was transmitting at 14.195 MHz.
CODARS generally don't operate in the amateur bands (especially in the US). Typically what you see in the amateur bands are OTHRs and various surface wave radars (likely military, not used for oceanographic research).
So just for clarification, my point about your post was that you were using misleading terminology by calling it a CODAR. Radar or OTHR would have been more appropriate and not misleading as to the application or intent of the radar. CODAR is the name of the company that makes oceanographic research radars (CODAR - Coastal Ocean Dynamics Applications Radar). Its a terminology thing. Jim, N1SZ
Exactly, Jim (and Stacey), Not every HF RADAR is a CODAR, just like not every candy bar is a Snickers. Naming matters.
