cluster beacons造句

There is no evidence that the cluster beacon " P " and the solitary beacon " P " are directly related.
Occasionally, some cluster beacons ( especially " F " and " M " ) have been reported transmitting on frequencies different from their regular channel for short periods.
The following call signs and frequencies of cluster beacons have been reported recently ( September 2007 to November 2008 ) in Numbers & Oddities newsletter, Utility DX Forum and ENIGMA-2000:
According to ENIGMA, cluster beacons are used by the Russian navy ( especially its submarine branch ) to find the most suitable radio frequency for contact based on current radio propagation conditions.
It's difficult to find cluster beacons in a sentence. 用cluster beacons造句挺难的