A recent BBC news article regarding a synthetic aperture radar (SAR) contract award for operation within the 70 centimeter band has raised some concern within the Amateur Radio community. The contract to Airbus Space would involve determining the density of Earth’s forests using a P-band (432-438 MHz) SAR. That band segment was allocated for use by the Earth Exploration Satellite (Active) Service at World Radiocommunication Conference 2003 (WRC-03). ARRL Chief Technology Officer Brennan Price, N4QX, said SAR activity has not been found to be a significant problem to Amateur Radio activity on the 70 centimeter band. Both EESS (Active) and Amateur Radio are secondary on the band in International Telecommunication Union (ITU) Regions 2 and 3 (Amateur Radio is co-primary with the Radiolocation Service in ITU Region 1), and Price said SAR operation is subject to significant constraints.
“The interference potential from one orbiting SAR to one fixed Amateur Radio station is on the order of less than 1 minute over an orbital period of more than 10 days,” Price said. “Practically speaking, nearby electrical lines and Part 15 devices are more likely to be bothersome.”
Price said news items in articles aimed at the general public are “often notoriously short” on technical details. ITU-R Recommendation RS.1260-11 — incorporated by reference in the ITU Radio Regulations and binding on EESS (Active) stations — spells out the WRC-03 consensus on SARs operating at 70 centimeters. Among other things, RS.1260-1 states that EESS (Active) instruments operation profile “shall be campaign-oriented, targeted to specific geographical areas and shall limit the instrument active time to the minimum required to achieve the campaign objectives. Thus, the measurements carried out by the instrument do not require continuous operation of the instrument, and intervals of months between successive measurements on the same area can be expected.” The Recommendation further states that the operational duty cycle of an SAR in campaign mode will be 15 percent (typically 10 percent).
A Russian satellite, AIST-2D, launched on April 28, will conduct SAR work as a technology demonstration and scientific research satellite developed at Samara Aerospace University. Its 200 W SAR will operate in the 433-438 MHz band. It will also transmit telemetry in the 70 centimeter band.
More
This is the second project using the LinkIt One board in the previous instructable I showed you how to build a distance measuring tape. In this tutorial I’m going to show you how to make a Morse Code Decoder/Encoder using the LinkIt O... Read more
Lastest News
SDRplay SDRconnect demo at Friedrichshafen 2022
This video shows the demo we showed at Ham Radio 2022, in Friedrichshafen, Germany. This demonstrates the core underlying technology behind what we’re... Read more
Mini DIGITAL PWR / SWR meter review
This is the review of a Mini portable PWR and SWR meter with built-in battery and High SWR warning buzzer. There are also the Xiegu X6100’s outp... Read more
Amateur/RNSS Coexistence – 23cm Band
23cm Band After review and approval by the IARU Region 1 Executive Committee and the IARU Administrative Council a presentation on preliminary Amateur... Read more
Building a Yaesu FT-891 remote control box
Dave, KZ9V stops by the shack, and share with us his memory keyer remote control box he built for the Yaesu FT-891 Read more
EUHFC 2022 CANCELED!
SCC Contest Committee has decided to cancel EUHFC 2022 due to the current situation in Europe related to the war in Ukraine. We do not see the point i... Read more
Use your Privileges Properly – Ham Radio
Due to some inquiry by Eric, KB0YDN, I decided to make this video discussing the incident of the Ham Firefighting Interference in Idaho Last year. Thi... Read more
Radio Signals: What happens if there’s a hill in the way?
“Let us understand what happens if you have a hill or mountain in the way of your radio signal because I recently published a video showing you... Read more
4 Way Remote Antenna Switch with WiFi
Remote Antenna Switch 2022 saw the return of the Dayton Hamvention and also celebrated the 70th anniversary of the world’s largest ham radio tra... Read more
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Fno-need-for-panic-regarding-synthetic-aperture-radars-on-70-centimeters-arrl-cto-says%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151