ous ▁out build ings ▁support ▁instrument ation ▁such ▁as ▁ion os ond es , ▁se ism om eters ▁and ▁upper ▁atmos pher ic ▁experiments . ▁A ▁t ide ▁gauge ▁is ▁installed ▁in ▁Garden ▁C ove . ▁ ▁Communic ations ▁The ▁radio communic ations ▁station ▁has ▁call sign ▁" V J M " ▁and ▁conduct s ▁a ▁night ly ▁H F ▁radio ▁schedule ▁with ▁the ▁field ▁h uts ▁on ▁ 3 0 2 3   k Hz ▁( time ▁var ies ▁depending ▁on ▁season ▁and ▁staff ▁prefer ences ). ▁Communic ations ▁with ▁Australia ▁are ▁conducted ▁using ▁the ▁A NA RES AT ▁Earth ▁station ▁facility ▁which ▁util ises ▁the ▁Int els at ▁Pacific ▁Ocean ▁satellite . ▁In m ars at ▁and ▁I rid ium ▁Sat ellite ▁L LC ▁port able ▁units ▁are ▁used ▁as ▁a ▁backup . ▁A ▁network ▁of ▁V H F ▁radio ▁repe aters ▁is ▁util ised ▁with ▁hand h eld ▁trans ce ivers ▁by ▁bush walk ers ▁on ▁the ▁island . ▁The ▁base ▁has ▁an ▁Internet ▁Pro tocol ▁network ▁for ▁local ▁PC ▁and ▁Vo IP ▁equipment . ▁ ▁History ▁The ▁station ▁was ▁opened ▁in ▁ 1 9 1 1 ▁by ▁Douglas ▁M aw son ▁as ▁his ▁party ▁established ▁a ▁base ▁to ▁relay ▁radio ▁messages ▁from ▁Ant arct ica ▁to ▁Hob art , ▁Tas mania . ▁From ▁ 1 9 4 8 ▁the ▁Australian ▁National ▁Ant ar ctic ▁Research ▁Ex ped itions ▁used ▁the ▁base ▁for ▁scientific ▁purposes . ▁ ▁See ▁also ▁Am ateur ▁radio ▁call ▁signs ▁of ▁Ant arct ica ▁ ▁List