The Amateur Radio on the International Space Station (ARISS) packet digipeater aboard the ISS has been active for several days now on 437.550 MHz. The UHF frequency means users will have to make adjustments for Doppler on both uplink and downlink.
The change to 70 centimeters comes in the wake of a problem that has sidelined the Ericsson VHF transceiver, so the UHF model has been put into service. The digipeater operates just as it did when it was on its former 145.825 MHz frequency.
AMSAT suggests that users program a group of five memory pairs to permit an operating range that will compensate for Doppler, with transmit frequencies from 437.560 to 437.540 MHz, and receive frequencies from 437.540 to 437.560 MHz, in 5 kHz increments (i.e., the transceiver would be in simplex for 437.555 MHz).
More information is available from the AMSAT Station and Operating Hints page. Scheduled ARISS contacts and APRS operations will also utilize the Ericsson UHF transceiver in the Columbia module. — Thanks to AMSAT News Service
Antenna
MULTIBAND H-POLE – VERTICAL WIRE ANTENNA FOR 160m – 10m by HB9MTN
“After several attempts to build a multiband C-Pole I finally ended up with the Multiband H-Pole. C-Poles for different frequencies on one pole... Read more
10 Element Triple Monobander 80/40/20m – OptiBeam
OptiBeam OB804020 10 Element Triple Monobander 80/40/20m Bands 80 / 40 / 20 Gain (dBd) * 3,8 / 4,8 / 8,4 ... Read more
How to install a Horizontal Waller Flag antenna at 150 foot
The Horizontal Waller Flag antenna is a produced and sold by Carlos N4IS http://top-beam.com/ The boom on this one is 44 feet long. Interlaced... Read more
AEG Ultra Loop RX 40-80-160
Technical specifications 160m Gain -25dbi 80m Gain -15dbi 40m Gain -8dbi Weight 5Kg Loop 2 phased elements for 40/80/160, optimized for rx 80/160, ... Read more
Rotators + Controller Rot1prog USB are smal, medium ideal for use with HEXBEAM
New product on offer – HEXBEAM SP7IDX TECHNOLOGY recommends SPID ELEKTRONIK – NEW 2017 rotators + controller Rot1prog USB are smal, medium ideal... Read more
The InLogis/Pixel Active Magnetic Loop Antenna Now Available Exclusively at DX Engineering
Amateur Radio operators have relied on the RF-PRO-1B Active Magnetic Loop Antenna for decades. Now, it is manufactured and sold exclusively by DX Engi... Read more
Review
“Generators” is the topic of the new (June 22) episode of the “ARRL The Doctor is In” podcast.
“Generators” is the topic of the new (June 22) episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Sponsored by DX Engineering, “A... Read more
Windom 40 Antenna By Chameleon Antenna
Check out this video on the Windom 40 Antenna from Chameleon Antenna. This antenna is an off center dipole that was specifically designed for 40, 20 a... Read more
ICOM IC 705 Wireless LAN Digital Demo
https://www.youtube.com/watch?v=auW2vMQsQBA Read more
Bury 100ft of wire 10in deep in 10 minutes without any mess
The greatest tool any underground utility contractor could own. Bury wire and conduit faster and easier without the mess. Read more
RF Loss – The Doctor Will See You Now!
“RF Loss” is the topic of the latest (May 10) episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Sponsored by DX Engineering, “AR... Read more
