[HCDX] Radio Canada International, BC Relay Station -- tail wagging the dog?

["mhev" <mhev@xxxxxxxxxxx>]

Radio Canada International, BC Relay Station.

http://CBC.am/rci-bc.htm

For covering Australasia, it seems that an HR 4 / 3 / 1 is recommended, at
500 kw. RCI could literally overpower (with respect to DBi field strength)
RNZI or Radio Australia if the proper frequencies were chosen.

-- text --

Technical Note
The city of Esquimalt, BC was chosen as a transmitter site for software
related reasons. The final location for the RCI relay station is not set in
stone, as there are many factors that will affect the final placement of
this relay station. It is expected that Tofino, Bella Bella, Masset or other
coastal BC cities could be chosen for the relay station (s).

The reasons for other sites to be chose are based on the following varibles:

- geography : all sea path to Asia Pacific, a requirement with respect to
reducing transmitter output power requirements

- geology : swampy or near swampy conditions (for high HF reflectivty), near
zero (1 in 750 years) tsunami risk, minimal eartquake / rockfall / land
slippage or any other related geological risks, no tall moutains to
interfere with signal transmission path ...

- electrical : electrisity supply (a 500 kw transmitter needs ~ 1.25
megawatts to run at full power), avoidance of population centres (to comply
with IEEE and EBU recommendations on exposure to EM fields)

- accessability and defensibiliy of transmitter site (s) with respect to
paved roads, useful for staff morale -- nearby urban centres have more
services

- land easily donatable by BC or Federal gouverment, not subject to any
onging first nations land claims processes

Secondary relay station sites : Kitimaat, BC suggests itself for targeting
the Russian Far East, China and other parts of North Asia.

All of these computations assume that an ALLISS transmission system is used.

ALLISS only requires 15 ha per module. One ALLISS module could solve 60 % of
RCI's transmission needs in the Asia Pacific, and Latin American regions.

However, the ALLISS system lacks the directivity of a multi-segmented curtan
array.

A second relay station some distance (100+ kms) away that would possess:

1 x HRS 12 / 6 / 1 (9, 11, 13, 15, 17, 21 mhz) to North Asia
1 x HRS 12 / 6 / 1 (7, 9, 11, 13, 15, 17 mhz) to Latin America

Such a relay station would increase directivity and audibiliy in these
regions by 12 db or more, when compared to HRS 4 / 4 / 1 antenna systems.

-- end text --




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