Radio

KØFFY

I earned my ticket in 1998 in college at Iowa State University working on an amateur hydrogen-line radio telescope along with KC0AYD. I was off the air for almost 20 years after college until 2017, when I got interested in APRS, SDR,  and then got bit by the amateur satellite bug.

Operating

  • FM Satellite QSOs (SO-50, AO-85, AO-91, and AO-92)
  • Packet Satellite QSOs (ISS, NO-84, and FalconSat-3)
  • SSB Satellite QSOs (AO-7, FO-29, EO-88, CAS-4B, XW-2*, etc)

Interests

Packet

My first experiment with amateur satellites was sending APRS packets via ISS and PSAT (NO-84). For this, I dusted off my skills from college to build a homebrew Yagi, and used a Baofeng HT and PocketPacket TNC software on an iPhone.

I now work packet QSOs on ISS, NO-84, and FalconSat-3 with APRS messages, using a Kenwood TH-D72a and an Arrow satellite antenna.

FM

I also work the FM birds SO-50, AO-85, AO-91, and AO-92, chasing grids, occasionally roving, and generally trying to support others in the hobby. I had my first satellite QSO via SO-50 on March 27, 2017 with K5ND in Texas. I earned the VHF/UHF Century Club (VUCC) Award on October 23, 2017, contacting over 100 grid squares, using only FM and packet satellites. So far, the farthest stations I have contacted via FM satellites have been:

College Homebrew Radio Telescope
In actuality, ISU was anything but boring!
  • North: Grid ER60 in Nunavut with VY0ERC at 4,288 km (AO-91).
  • East: Grid GP49 in Greenland with OX/NJ7H at 3,933 km (SO-50).
  • South: Grid EJ97 in Panama with HP2VX at 3,981 km (AO-91).
  • West: Grid CO29 in Alaska with AL6D at 3,443 km (AO-85).
  • Overall FM Distance Record: 4,288 km with VY0ERC in Grid ER60tb (AO-91).

SSB

In December 2017, Santa Claus delivered an FT-817, a portable, all-mode QRP radio, and I started working linear transponder satellites, operating semi-duplex. Due to the challenge created by Doppler shift on the 70cm band while working any Mode B satellites semi-duplex, I mostly worked FO-29 with a 2m uplink, having my first linear QSO on December 9, 2017 with NP4JV.

Later that month, I got an old FT-790R II, an all mode 70cm transceiver, which allowed me to operate linear satellites full-duplex. I completed my first Transatlantic QSO via AO-7 with M0NPT in England at 6,602km distance on January 19, 2018.

Overall Satellite Distance Record: 7,329km with PU8RFL in Grid GI84ow in Brazil (AO-7).

K0FFY Roving Working Over Frozen Lake
Roving in EN30 Missouri. Working Europe from Iowa in Winter.

SDR

I also have a FUNcube Dongle Pro+ SDR. In 2018, Here are some of my interests and experiments with this SDR:

  • I have decoded telemetry data from FUNcube-1 (AO-73) and Nayif-1 (EO-88).
  • I have made SSB QSOs on FO-29 and AO-7 using my SDR in combination with a Windows tablet as the receiver.
  • I am also interested in receiving WSPR digital messages on HF bands.
  • I have had QSOs with other operators on LilacSat-1, which requires an SDR to decode the digital downlink. My first QSO on this satellite was with KB1PVH in Massachusetts on June 13.

Here is a link to my instruction guide for working LilacSat-1.

Other interests include spending time with my family, especially while traveling, hiking, reading, amateur astronomy, and, as it should probably go without saying, fine coffee.

73 and 55 (best success) to all,

Adam, KØFFY EN31

ISS Packet Assistants AO-7 on Hoth
ISS packet communication assistants. Working AO-7 Tauntaun mobile from Hoth.

Satellite Grids Confirmed

Satellite WAS