VHF Frequencies

rnbenton

rnbenton

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OK, I guess it would be easy enough to go out to the boat and check for myself by listening. But, I thought I'd ask here anyway :)

On the standard Marine VHF radio, is Channel 19 the same freg as the standard CB radio?

Bob
 
CB's and marine radios use completely different frequency ranges.
A CB radio on a boat is pretty much useless as other boaters and the CG will only monitor marine channels.
 
Nobody said anything about putting a CB radio on a boat. I was just asking a question, That's all.

OK, maybe it was a dumb question. But, that's all it was.

Bob
 
no, not a dumb question at all, but since you asked, I only assumed you were thinking of putting a CB on your boat.
 
Ch 19 = 27.185 MHz Single Sideband operation
Ch 19 Marine VHF = 156.950 MHz FM operation

Different frequency, different modulation type. ( And, since different wavelength, different antennas )

Note also that the different frequencies means different propagation as well. Marine VHF range is typically "just over the horizon" and CB till traverse farther ( direct path, ground wave ). Additionally, communications in the CB band can be "skipped" through the ionosphere, which can produce world wide transmissions ( both good and bad; long communication as well as world-wide interference )
 
quote:
Originally posted by cwms

no, not a dumb question at all, but since you asked, I only assumed you were thinking of putting a CB on your boat.

Click to expand...


ROFL, Nope, thinking about putting a marine radio in my car. :D

Bob
 
Radioactive touched on this (modulation) but CB is AM, marine VHF is FM.
 
quote:
Originally posted by Radioactive

Ch 19 = 27.185 MHz Single Sideband operation
Ch 19 Marine VHF = 156.950 MHz FM operation

Different frequency, different modulation type. ( And, since different wavelength, different antennas )

Note also that the different frequencies means different propagation as well. Marine VHF range is typically "just over the horizon" and CB till traverse farther ( direct path, ground wave ). Additionally, communications in the CB band can be "skipped" through the ionosphere, which can produce world wide transmissions ( both good and bad; long communication as well as world-wide interference )

Click to expand...


That 'splains it. Thanks.

Bob
 
--> Bob

Glad to assist.

--> Sandy

TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)

PART 95_PERSONAL RADIO SERVICES--Table of Contents

Subpart E_Technical Regulations

Sec. 95.631 Emission types.
...
(c) A CB transmitter may transmit only emission types A1D, H1D, J1D,
R1D, A3E, H3E, J3E, R3E. A non-voice emission is limited to selective
calling or tone-operated squelch tones to establish or continue voice
communications. See Sec. 95.412 (b) and (c).

Sandy, we are both "right". FWIW, the last CB I used was SSB ( J1D ). The "original" spec was for AM ( A1D ). I have no idea what is available "off the shelf" at the nearest truck stop.

And just for the record, both radio types ( Marine VHF and CB ) are authorized for FCC type accepted equipment only.
 
quote:
Originally posted by Cam

quote:
Originally posted by rnbenton

quote:
Originally posted by cwms

no, not a dumb question at all, but since you asked, I only assumed you were thinking of putting a CB on your boat.

Click to expand...


ROFL, Nope, thinking about putting a marine radio in my car. :D

Bob

Click to expand...


Click to expand...


I know you know this already, but a marine radio in your car is illegal.
 
Back in the 60s and 70s, before the advent of the compact and affordable marine radio, CBs were commonly used on boats. I recently removed an old, inoperative CB from my 1977 Californian.
 
Al,
Thanks. That explains why my '68 Bertram (new to me last March '11) has an old CB (that still works).
 
You'll find that some commercial fishermen still use CB. It has good range over water and not all that many folks listen to it. It has it's advantages, depending on whom you want (or not) to hear what you have to say.

And as Cam said, a marine radio in your car (or home) is illegal (at least without the appropriate license).

But re the original question, channel 19 is NOT the same on both radios.
 
quote:
Originally posted by Cam

quote:
Originally posted by Cam

quote:
Originally posted by rnbenton

quote:
Originally posted by cwms

no, not a dumb question at all, but since you asked, I only assumed you were thinking of putting a CB on your boat.

Click to expand...


ROFL, Nope, thinking about putting a marine radio in my car. :D

Bob

Click to expand...


Click to expand...


I know you know this already, but a marine radio in your car is illegal.

Click to expand...


It was a joke.

Bob
 
That website provides a great chart. I printed it out and will put in my "papers" drawer on my boat.
 
CB radio's were almost standard equipment on boats back in the 1970's. At one time the USCG did monitor CB channel 9. CB is widely used in the Bahamas (by the locals)and around some foreign ports it is the preferred way to call for a Taxi. Having a marine band Vhf in your car may be against the law, but the FCC would really have to be scraping bottom to come after you. A large percentage of farm tractors/equipment, farm trucks and Deer/Duck hunters in the Mississippi Delta use marine band Vhf's to communicate.
 
quote:
Originally posted by Cam

quote:
Originally posted by Cam

quote:
Originally posted by rnbenton

quote:
Originally posted by cwms

no, not a dumb question at all, but since you asked, I only assumed you were thinking of putting a CB on your boat.

Click to expand...


ROFL, Nope, thinking about putting a marine radio in my car. :D

Bob

Click to expand...


Click to expand...


I know you know this already, but a marine radio in your car is illegal.

Click to expand...


Sorry, CAM it is not illegal to put a marine radio in your car, it is illegal to transmit from your car. So as long as you are just listening you are fine.
 
quote:
Originally posted by spj

quote:
Originally posted by Cam

quote:
Originally posted by Cam

quote:
Originally posted by rnbenton

quote:
Originally posted by cwms

no, not a dumb question at all, but since you asked, I only assumed you were thinking of putting a CB on your boat.

Click to expand...


ROFL, Nope, thinking about putting a marine radio in my car. :D

Bob

Click to expand...


Click to expand...


I know you know this already, but a marine radio in your car is illegal.

Click to expand...


Sorry, CAM it is not illegal to put a marine radio in your car, it is illegal to transmit from your car. So as long as you are just listening you are fine.

Click to expand...


I know that almost everyone here knows this, but for any newbies out there just tuning in for info, I thought it should be mentioned. Just wanna cover all bases.
 
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