A glorious vista part two

Mount Glorious is an ‘urban mountain’ that is a well known destination for hiking, bird watching and televison/radio projects, situated in the D’Aguilar National Park. Briefly, FM radio reception was observed in a street with an altitude of 767 metres above sea level. This may be indicative of permanent reception possible.

Steps, Mt Glorious © 2006 Sherwin Huang

By using specialized car receivers & antennas, high altitude ‘mountain topping’ may offer better long distance FM reception compared to multi-element, rooftop yagi antennas in built-up areas. For the uninitiated, beware that there is a catch! Mountains rarely provide unobstructed paths to all towns. No matter how high the receiving location is, nearby mountains in this region tend to kill any opportunity of reception from one or more particular directions, even if the surrounding mountains have lower altitude. At Mount Glorious (for example) serious impediments affect line of sight to the north.

The on-line path profiler Hey What’s That suggested the mountains of O’Reilly (503 m), Lawson (473 m) and Samson (689 m) may obstruct reception towards the north. This proved accurate with no Bundaberg FM stations receivable under baseline conditions. Towards the north-east was another impediment, Mount Tenison Woods (757 m).

Sunrise, Mt Coot-tha © 2009 Angus Veitch

The 100 kilo Watt stations on Mount Coot-tha (above) are sited 22 kilometres east of Mount Glorious. Images of Nova & ABC Classic FM from there appeared on 102.3 & 103.1 MHz, respectively. These ghost signals were noticeable only when the automotive antenna was orientated towards the east.

The average portable may ‘shit its pants’ here in Brisbane Forest Park, which is why using a car radio is likely a better choice! Back in the 2000s, this sensitive portable (which is still functional) was taken to a vegie BBQ at Jolly’s Lookout, Mount Nebo. Regarding FM reception, no wonder there was disappointment!

Sony WM-FX77 © 2010 amormusicyjh (blogger)

Highlights from a predominantly unobstructed SSW-S-SSE coastal path (based on Hey What’s That terrain analysis) included:

91.3 2ABCRR ABC Central West Bonalbo (NSW) – 50 watt translator – 160km
(never heard in the city)

98.7 2ABCFM Classic FM Taree (NSW) – 100kW – 486km &

99.1 2NWR ABC New England Mt Dowe, Narrabri (NSW) – 200kW – 415km

*102.5 The Breeze Mt Mackenzie, Tenterfield (NSW) – 4kW – 211km (corrected)
(never heard in the city)

This video shows broadcasts on 98.7 & 99.1 MHz from Taree & Narrabri, respectively. Note the ‘spew’ audible on 102.3 MHz.

RDS was receivable on 88.9 MHz from the Breeze translator, 88 km south-south-east. 92.1 MHz also has RDS.
(88.9 MHz never decoded in the city)

RDS PS

RDS RT, The Breeze FM 88.9

On 99.1 MHz, a Toowoomba narrowcast operation was heard mixing with Narrabri. The music programming was ‘old time stuff’. According to the website, this is Kids FM. Without hearing an ID this is a guess but it fits, being 85 km west-south-west.

Kids FM © 2013 Southern Cross Austereo

These Mount Glorious highlights were based on half an hour of listening during the early evening on 18 March (recording denoted with an asterisk) & 15 April. Fine weather prevailed. The Hepburn tropospheric index was marginal / 1.4.

These two recent trips suggest it is likely that tropospheric scatter varies noticeably at this altitude on a daily basis. Permanent residents would be better qualified to judge whether this observation is accurate.

Thank you to the companions on the trips for assistance with compass direction-finding, photography, three point turns in bogged mud, car washing & night navigation. Not quite as bad as this!

Bogged car © 2006 mundoo

This is a three part entry. The rationale was to split this into parts rather than bombard ‘time-poor’ readers with too much information at once. Next week, the final section will be published with four more clips from Mt Glorious & Mt Mee. There will also be some photos of the beautiful scenery… so ideally it’s not too dull!

Southern Cross Austereo is owner of the copyright in the logo for Kids FM. Station logos are solely provided for the purposes of research & education under the Fair Use provisions of the Copyright Act in this jurisdiction.

The copyright holders of photography included on this blog have licensed their works under the Creative Commons for non-commercial use (such as this not-for-profit blog) with attribution. To view more of their work, type the photographer’s name into Flickr.

Altitudes specified are approximate, based on GPS mapping. Distances are from FMscan.

Advertisements

Comments are closed.

%d bloggers like this: