New World Distance Records Set on 2.3 and 3.4 GHz Ham Bands

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Tim Bucknall
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Joined: 01 Oct 2014 14:55
Location: Now stranded in Congleton

New World Distance Records Set on 2.3 and 3.4 GHz Ham Bands

Post by Tim Bucknall » 24 Jun 2015 18:25

New World Distance Records Set on 2.3 and 3.4 GHz Ham Bands

06/23/2015 ... -ham-bands

Two California radio amateurs — one of them in Hawaii — have set new
world distance records on the 2.3 and 3.4 GHz microwave amateur bands.
Wayne Overbeck, N6NB, operating from a radio-equipped rental car on
the big island of Hawaii, worked Gregory Campbell, W6IT, operating
Overbeck’s own fixed station near Orange, California, on both bands —
a distance of more than 4024 km (2495 miles). The contacts blew away
records that had stood for more than 20 years and more than doubled
the previous distance record for a two-way voice (SSB) contact at
those frequencies, Overbeck said, adding that most previous microwave
distance records have been set using CW.

“These are the first-ever SSB contacts between Hawaii and the mainland
on 2304 and 3456,” Overbeck said.

The record-setting contacts occurred on June 19 (June 18 in Hawaii) on
2.3 GHz at 0257 UTC and at on 3.4 GHz at 0300 UTC. W6IT was in grid
square DM13cs, while N6NB/KH6 was in BK29hq. According to the database
of distance records maintained by Al Ward, W5LUA, the old record was
3982 km, set on by KH6HME (SK) and N6CA on July 14, 1994, on 2.3 GHz
and on July 28, 1991, on 3.4 GHz. Both contacts were on CW.

Overbeck flew to Hawaii carrying gear for all bands from 144 MHz
through 10 GHz “in two large suitcases, plus a roll-aboard and a
backpack” — weighing about 150 pounds in all. In Hawaii, he rented a
small SUV and built a rover-style station that included a rotating
roof platform constructed using parts obtained from a home improvement

Overbeck said that when a tropospheric duct formed that could convey
signals thousands of miles across the Pacific, he drove around the
slopes of Mauna Loa — 13,000 feet up —and selected several promising
sites for long-haul DX, “not necessarily the highest possible sites,”
he added. “By Thursday, June 18, the duct seemed to be peaking,” he

W6IT activated N6NB’s fixed station and quickly worked N6NB/KH6 on six
bands, including 2304 and 3456 MHz for world records. Overbeck said he
also heard W6IT on 902 MHz and 5.7 GHz, but local, non-amateur
interference in California — likely from Part 15 WiFi devices —
prevented W6IT from hearing N6NB/KH6 on those bands.

A video of the record-setting 2304 GHz contact between N6NB/KH6 and
W6IT (recorded from the Hawaii end of the circuit) is online.
Rx: Burkhardt Reuter RDR54D1, Elad FDM-S2, Airspy HF+ w/ CLP 5130 Log P ant on rooftop rotator V/H polarization options. Pira P275 RDS analyser

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