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
![Kenwood TS 890S at HamNation [ Video ]](http://qrznow.com/wp-content/uploads/2018/05/TS-890S-l-90x60.jpg)
Antenna
![HF Loop Antennas – ARRL The Doctor is In [ PodCast ]](http://qrznow.com/wp-content/uploads/2017/02/11825222_887255654645435_1859337703964508434_n-190x122.jpg)
HF Loop Antennas – ARRL The Doctor is In [ PodCast ]
“HF Loop Antennas” is the topic of the just-released episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Sponsored by DX Engineeri... Read more
John Stanford, KF6I at SteppIR Antennas
“As we mentioned in our press release today, we are super excited to share that we have hired John Stanford as the newest member of our leadersh... Read more
Metrovna modern antenna analyzer
Metrovna and ‘a modern antenna analyzer designed for amateur radio.It allows you to measure all the parameters of an antenna as SWR, R, X, Z,Phase,RL,... Read more
80 Meter Shortened Inverted-L Bazooka Antenna
Bazooka Antenna A DOUBLE BAZOOKA antenna is an extremely broad-banded Half Wave Antenna that can operate efficiently across an entire Ham band with li... Read more
18el 6bander – GXP Antenas – 40/20/17/15/12/10
GXP Antenas 18el 6bander Bands 40/20/17/15/12/10 Gain (dBd) 3,9/10,6/10,3/10,5/10,2/10,5 F/B (dB) 22/26/22/23/20/21 SWR 40 le... Read more
Green Heron Rotator Controller RT-21azel
Rotator Controller RT-21 Azimuth/Elevation Two separate control boards for independent Azimuth and Elevation New crisp OLED displays Separate Point-an... Read more
Review
Xiegu X5105 QRP Portable HF Radio – Review and Demo HF/6m
Operating mode: A1A(CW)，A3E(AM)，J3E(USB/LSB)，F3E(FM) minimum frequency stepping: 1Hz Antenna impedance: 50Ω Operating temperature range: -10℃ ~ +60℃ F... Read more
Ham radio HF Go-Kit QRP contacts FT-817 emcomm SHTF doomsday
Here is a video about my go-kit with my FT-817 and making some contacts QRP. Videos on almost all items can be seen on my channel. In this kit i have... Read more
Controlling the OM2000A+ from Tablet
The automatic linear amplifier OM2000A+ is designed for all short wave amateur bands from 1.8 to 29 MHz (including WARC bands) + 50 MHz and all modes.... Read more
Baofeng DM-5R DMR Radio – Unboxing & First Impressions
BaoFeng DM-5R DMR Digital Radio VHF/UHF 136-174/400-480Mhz 2000mAH High Capacity Battery High Power/Low power 21CM Dual Band Antenna 8-Level Stepped F... Read more
New DMR / DSTAR / Fusion / P25 Nano-Spot WIFI Digital Ham Hotspot
Here is a brand new device for your digital radio pleasure. The Nano-Spot from Micro-Node.com features all 4 modes, Wifi and a “set it and forge... Read more
Review of SDRplay SDRduo Two-Tuner SDR Radio
“SDRplay has done it again with an outstanding and technically sophisticated software-defined radio that even at $280 is still a bargain. The vi... Read more
