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7 November 2012, 12:52
(This post was last modified: 7 November 2012, 12:53 by OpSecRadio.)
With duplex channels, the ship station transmits on the lower (A) frequency and listens on the upper (B) frequency. The shore station transmits on the upper (B) frequency and listens on the lower (A) frequency.
After a bit more research i've just found out that many of the duplex channels which were used for public correspondence are now being allocated for other services such as weather forecast broadcasts and AIS due to the increased use of mobile telephones and satellite services. These duplex channels can now be operated as Simplex on the lower frequency for both RX and TX, they have been designed with an A suffix, e.g.
21 157.050 161.650 Ship to Shore duplex
21A 157.050 157.050 Simplex
I guess either configuration would work after SHTF
After a bit more research i've just found out that many of the duplex channels which were used for public correspondence are now being allocated for other services such as weather forecast broadcasts and AIS due to the increased use of mobile telephones and satellite services. These duplex channels can now be operated as Simplex on the lower frequency for both RX and TX, they have been designed with an A suffix, e.g.
21 157.050 161.650 Ship to Shore duplex
21A 157.050 157.050 Simplex
I guess either configuration would work after SHTF
73 de
OSR
The duty of a true patriot is to protect his country from its government ~ Thomas Paine
OSR
The duty of a true patriot is to protect his country from its government ~ Thomas Paine