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
INAC AX-330 – HF Antenna
HF Antenna AX-330, is an antenna that covers the spectrum of HF of 3.4 Mhz. 30.5 MHz continuously. Two loops tuned remotely by two servo motors, fed s... Read more
CX-AUTO Switch – Kessler Engineering, LLC
he CX-AUTO was designed to satisfy the many requests from AT-AUTO owners for additional coaxial outputs. It does that quite well and more! The CX-AUTO... Read more
How High Should a Dipole Be? A Look at Antenna Modeling
“How high should a dipole be? What happens if it’s too low or too high? We turn to EZNEC antenna modeling software to see that the old rul... Read more
HF Portable Par End-Fedz EF-20, Jackite Fiberglass Pole Deployment
This video shows how easy is is to set up an end-fed HF antenna and a fiberglass pole, even in non-ideal weather. Sorry for the water on the lens; the... Read more
EF155SL – 21 MHz Mono band antenna by YU7EF
21 MHz Mono band antenna by YU7EF See More: Link Read more
Review
Alpha Mag Loop Review, Interview with K7AGE at Pacificon – K6UDA Radio Episode 31
Here’s the review of the Alpha Antennas Magnetic Loop. Stay Tuned for the big 3 way shootout with the Chameleon P Loop & the Alexloop. I... Read more
2 Days Off Grid – /P Ham Radio to Japan FT8 Random Wire Antenna
“Hello Operators In the previous videos from this excursion, we covered portable off grid battery and solar power, the Raspberry Pi for data com... Read more
POWER POLE DC OUTLET – MFJ 1124 , 1106 , 1126, 1128, 1129, 1104
POWER POLE DC OUTLET – MFJ Read more
Kenwood TS990 UnBoxing and Basic Review
The TS-990S comes equipped with dual receivers for simultaneous reception on different bands, it also features narrow-band roofing filters on the main... Read more
The NEW Icom IC-9700 , It’s Amazing!!
IC-9700 Coming soon!! The new IC-9700, and a brief overview of the features it will have, as well as why I am really excited about owning one just as... Read more
