Scanner Uniden BCT 15x Simplex/Duplex

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Scanner Uniden BCT 15x Simplex/Duplex

Postby mike43 » Fri Aug 31, 2018 4:12 am

I am new to programming the marine band frequencies into my scanner for my area, and would like some advice from the forum members as regards Simplex and Duplex. The Simplex channels have one frequency, the Duplex channels have two frequencies. What I need to know is do I put in both frequencies on the Duplex channels, or just the one frequency on each channel. Or would I stick to just Simplex frequencies. Also there is a long list of marine band channels, will it be OK to input all of them up to about channel 88 or so in the hope that I would hear any transmissions on them. Thanks, Mike.
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Re: Scanner Uniden BCT 15x Simplex/Duplex

Postby Minus1 » Fri Aug 31, 2018 7:17 am

Put in both freqs, otherwise you may only hear one of the conversion on the duplex channels.
Service Search - Marine already has all Simplex and Duplex channels with their channel numbers --- one thing that Uniden got right, though it's slightly compromised by the fact they are US channels :rolleyes:
Business marine channels go above 88.
And don't forget the coastguard freqs of 156.0 (:0A) and 160.6 (:0B)
Another thing Uniden got wrong is that "repeater reverse" doesn't work for marine channels, despite the 4.6 MHz split being internationally agreed. :rolleyes:
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Re: Scanner Uniden BCT 15x Simplex/Duplex

Postby mike43 » Fri Aug 31, 2018 7:52 am

Thanks for that information Minus 1, I put the frequencies in this morning so that was a bit of luck. Just as an aside, the business channels, are they the channels marked channels 99-160.6000 to Channel 109 -158.47500?. Any help would be appreciated. Mike.
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Re: Scanner Uniden BCT 15x Simplex/Duplex

Postby Minus1 » Sat Sep 01, 2018 8:55 pm

Business channels (i.e. anything not publicly available on an-off-the-edge marine transceiver are anything outside the range 1-28 and 61-88.

Not sure about 99, I've often seen 160.6 listed as "99" but never heard the coastguard call it that. It would be the other end of 156.0 if it were a duplex freq, hence I prefer to call it ":0B" in the same way that 160.975 is :67B.

In numerical order, 157.975 is technically :99A, and 162.575 is :99B, though I don't have knowledge of those freqs actually being used for Marine radio.

The OFCOM Spectrum Information Portal lists Marine freqs as far up 158.5 (:50A) / 163.0 (:48B)
https://www.ofcom.org.uk/spectrum/information/spectrum-information-system-sis/spectrum-information-portal
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Re: Scanner Uniden BCT 15x Simplex/Duplex

Postby AndrewIrvine » Sun Sep 02, 2018 6:05 am

156.975 is one of the newer 4 digit channel numbers, all simplex. It came into use last year, along with

1019 - 156.950
1020 - 157.000
1078 - 156.925
1079 - 156.975
2019 - 161.550
2020 - 161.600
2078 - 161.525
2079 - 161.575

160.600 is 99, the Auxiliary Coastguard channel, rarely used but it exists. I've only heard it once, when two tasks were on the go in the same area.


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Re: Scanner Uniden BCT 15x Simplex/Duplex

Postby Minus1 » Sun Sep 02, 2018 8:53 am

Yes, but I mentioned 157.975 not 156.975 :smiles:
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Re: Scanner Uniden BCT 15x Simplex/Duplex

Postby AndrewIrvine » Sun Sep 02, 2018 5:42 pm

Sorry, I posted too early in the morning, 157.975 is only really used in America as channel 100, not here apart from the Solent as a private channel. Our 100 is 158.025


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Re: Scanner Uniden BCT 15x Simplex/Duplex

Postby mike43 » Thu Sep 13, 2018 3:46 pm

Thanks to the forum members for all the answers, as usual very helpful for me as learner.
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