California Radio Hams claim 77 GHz world record<p> The <em>ARRL</em> report mountain-topping radio amateurs in California are claiming a new world distance record on the 77 to 81 GHz band.<br><br> The claimed record was set June 13 between <strong>Robert Johnson, KF6KVG</strong>, on a peak just east of San Jose and <strong>Goran Popovic, AD6IW</strong>, in Kings Canyon National Park to the east-southeast.<br>
<br>“We achieved a distance of <strong>252.49 km</strong> from Mt Hamilton (CM97di) to Kings Canyon National Park (DM06ms),” Goran, AD6IW, announced on the 50 MHz & Up Group reflector. “We made two-way contact on FM and SSB with strong signals at both ends.”<br>
<br>KF6KVG used a 1-foot dish, and AD6IW a 2-foot dish. Both employed dielectric resonator oscillator-locked frequency control for extreme stability. The current E band record is 228 km, set in Germany between Philipp Prinz, DL2AM, and Alexander Wetzel, DL2GWZ.<br>
<br> According to ARRL CEO David Sumner, K1ZZ, this amateur band was first allocated internationally in 1979 as 75.5-81 GHz, with 75.5-76 GHz primary and the remainder secondary. </p><p>When allocations below 76 GHz were realigned at WRC 2000, 75.5-76 GHz was deleted, 81-81.5 GHz was added as secondary, and the primary allocation was shifted to 77.5-78 GHz although only 77-81 GHz is available currently to amateurs in the US. </p>
<p>Sumner says the band 77.5-78 GHz is under consideration at WRC 2015 for an allocation for automotive short-range radar, leaving the fate of the amateur primary allocation uncertain.<br><br><font size="1">Fonte: ARRL </font></p>