The radios used are HF SSB sets, 1w PEP output, 2 channels.
Channel 1 3345Khz
Channel 2 3216Khz
used are HF SSB sets, 1w PEP output, 2 channels.
WMRS is allocated a channel in the 90m band (3345kHz USB). The base station callsign is ZLJG and portables are allocated the same callsign with a serial number added. On air the "ZL" is usually omitted for brevity. The second channel fitted is 3261kHz USB used to contact bases in the south island.
feature of HF signal propagation is that the signals are reflected by the
ionosphere at a height of around 250km above the earth's surface. Thus the
signals radiated by the sets travel up to the ionosphere and are reflected down
again, hopping over mountains and other obstacles on the way. This contrasts
with VHF and UHF signals which pass through the ionosphere without reflection.
Cellphones are therefore limited to line-of-sight transmission paths to the
stations use high power (100 watts) to provide a strong signal. The transmit
power of the portables is limited by the battery capacity to about 1 watt. Thus
the transmission path from base to portable is more reliable than the reverse
direction. To make the best of the low power it is necessary to erect the aerial
as high as possible, using the full length provided. (If the base station is
having trouble hearing you, check the aerial first!)
coverage from the Wellington base station is from Arthur's Pass to Tongariro and
Urewera National Parks, although sets have regularly called in from Stewart
Island to the Bay of Islands.