Dave Swanson, KG5CCI, of Arkansas has achieved another distance milestone on the venerable AO-7 satellite using Mode B (70 centimeters up/2 meters down).
On February 10, Swanson, on Shinnal Mountain west of Little Rock (EM34st), completed a scheduled contact with Eduardo Erlemann, PY2RN (GG66lw), a calculated distance of 8030.895 kilometers (approximately 4979.2 miles), which Swanson said was “way beyond the theoretical range AO-7” and a feat that “the math said shouldn’t be possible.”
The tricky part was that, given their respective locations in the Northern and Southern hemispheres, the window allowing both to access the satellite at the same time was on the order of 5 seconds. After several attempts, they agreed to use quick call sign/grid square reports.
“At 2009 UTC, both stations clearly heard the other’s call and grid, completing the contact,” Swanson said. “It was extremely rapid and very weak, but clear…I think this is approaching the limits of what can be done on AO-7.” PY2RN has postedhis side of the contact, which Swanson called “by far the hardest sked I’ve ever attempted.”
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FlexRadio Comparison
Radio Model
FLEX-6400
FLEX-6400M
FLEX-6600
FLEX-6600M
FLEX-6700
MSRP
$ 1999
$ 2999
$ 3999
$ 4999
$ 7499
100W Transmit Output 160-6m
Maximum Simultaneous
Panadapter/Waterfalls & Slice Receivers2
2
4
4
8
Reciprocal Mixing Receiver Dynamic
Range115 dB
115 dB
115 dB
115 dB
116 dB
ADC Sampling Rate
122.88 Msps
122.88 Msps
245.76 Msps
245.76 Msps
245.76 Msps
Contest Grade Preselectors
3rd Order
3rd Order
7th Order
7th Order
3rd Order
Spectrum / Waterfall Maximum
Bandwidth7 MHz
7 MHz
14 MHz
14 MHz
14 MHz
Automatic Antenna Tuner
OPT
OPT
Cableless Digital Modes
Full Duplex Operation
Simple Remote over Native WAN
Maestro, PC, MAC and iPAD Operation
External 10MHz Reference Input
Receive Only Inputs including
Transverter Ports2
2
4
4
3
Continuous MARS/CAP TX Coverage
OPT
OPT
OPT
OPT
GPS Disciplined Oscillator Option
OPT
OPT
OPT
OPT
OPT
Diversity Reception
Single Radio SO2R
Dedicated Balanced Mic Input
(XLR/TRS)
2 Meter RX/TX (5dBm output power)
Integrated Display Resolution
1920×1200
1920×1200
Integrated Display Size
8 in
8 in
Touch screen type
Capacitive
Capacitive
HDMI Output
Antenna
Comet mobile antenna of 430MHz band – ASF-430
144MHz 2m Portable Yagi VHF Beam Antenna by M0UKD
Stealth Antennas by G0KYA
2 Meter VHF Quarter Wave Ground Plane Antenna – Ham Radio Q&A
CUSHCRAFT SR-5 – 5-BD, 9EL, 10/12/15/17/20 M, 5KW
Antenna beam 2 elements 80m (Monobander)
Review
Icom IC-705 with the mAT-705 Portable Tuner
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