need help understanding

[FCVPI99]

i know CB radio s channels numbers are 1.2.3.4.....to 40



why are marine channels1.5.6.7.8...20.20A...28.63


i guess im asking how made the channel line up and what were they drinking???

 

[FCVPI99]

and also we do boating in the chain o lake in lake and mechenry county in illinois if the police boats use marine they would be on channel 16 correct??

 

[KF4ZTO]

Correct. Police boats equipped with Marine radios will be monitoring channel 16.

 

[SCANdal]

Drinking as being a reason why? That's a bit childish.

Ford Crown Vic Police Incinerator '99,

There are two parts to your problem here. One is that it appears that you aren't aware of the fact that there are two VHF high band marine channel plans in place, one plan for the United States - which uses some (but not all) of the second plan - the International plan. Visit the Coast Guard's site http://www.navcen.uscg.gov/marcomms/apps18.htm for a full list of frequencies. Armed with this new information, a good question would have been "Why does the VHF marine channel plan jump from F28 to F60?" Or, "What happened to F29 through F59?" Visit http://members.accesswave.ca/~amabaa/marine.htm and scroll down to the fifth paragraph (the one starting with "Another complication...") under the caption "VHF Marine Band" for a full explanation.

SCANdal

 

[trainman111]

There are actually 3. One for the US, one for Canada, and one for International.

 

[Don_Burke]

i know CB radio s channels numbers are 1.2.3.4.....to 40

Actually, if you take them in frequency order, they are 1, 2, 3, 3A, 4, 5, 6, 7, 7A, 8, 9, 10, 11, 11A, 12, 13, 14, 15, 15A, 16, 17, 18, 19, 19A, 20, 21, 22, 24, 25, 23, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, & 40

why are marine channels1.5.6.7.8...20.20A...28.63

i guess im asking how made the channel line up and what were they drinking???

It makes more sense than it appears to at first.

The ship channels start with channel 1 on 156.05 MHz and go up in 50 kHz steps to channel 28 on 157.4 MHz. Many of the channels are duplex with a shore frequency 4.6 MHz higher than the ship frequency.

Under the international plan, 6, 8, 9, 10, 11, 12, 13, 14, 15, & 16 are simplex on the ship frequency and there is no coast frequency.

Later, as receiver selectivity increased, more ship channels were added between the existing channels with channel 60 on 156.025 MHz going up in 50 kHz steps to channel 88 on 157.425 MHz. Many of these are duplex with a shore frequency 4.6 MHz higher.

Under the international plan, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, & 77 are simplex and there is no coast frequency.

75 and 76 have been unused and left as a guard band for the calling and distress channel (16) and have only recently been approved for use. I have never seen a radio that could transmit on 75 or 76.

In the US, 1, 5, 18, 19, 22, 23, 63, 65, 66, 78, 79, 80, 81, 82, & 83 are simplex on the ship frequency. When a ship frequency of a duplex pair is used simplex, it is followed by the letter "A" as in channel 22A, which is used by the US Coast Guard. I have read that if a coast frequency of a duplex pair is used simplex, it is followed by the letter "B", although I have not seen that done.

2, 3, 4, 60, 61, 62, 64, & 87 are not used at all in the US Marine Service.

70 is a digital channel and is not used for voice.

All of this is from the keyboard of a bleery-eyed old dude and probably has some typos in it.

Aren't you glad you asked?

 

[HelixArray]

Good info, Don.