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Can't send/receive on channel 26 and 27

Old 07-12-2014, 05:44 AM
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Question Can't send/receive on channel 26 and 27

I have what may be a dumb question but here goes:

Why can't I send and receive on channels 26 and 27? I am trying to do a radio check on SeaTow's channels and not getting anything. I busted out the handheld VHF and didn't hear anything when I sent or received, even on the fixed mount. There's no communication between either radio. Took out my ART-2 antenna tester and it was well within specs. Tuned to channel 9, 16, 68, 69 and was able to send and receive on both radios.

Is there any reason why? I have searched and searched and cannot find anything. Both are Standard Horizon. Fixed mount is an Explorer and handheld is an HX300.

Thanks in advance for the advice.

Dean
Old 07-12-2014, 06:42 AM
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I tried doing the same thing, but I did not try to communicate between my handheld and fixed unit. I have a standard horizon explorer and a cobra handheld. I tried to do a seatow radio check and for no response. I was in a marina in Venice, La. and the other time at marina in grand isle, La. (I think 27 is for the New Orleans area.)
Old 07-12-2014, 08:29 AM
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Originally Posted by dinokath View Post
I have what may be a dumb question but here goes:

Why can't I send and receive on channels 26 and 27? I am trying to do a radio check on SeaTow's channels and not getting anything. I busted out the handheld VHF and didn't hear anything when I sent or received, even on the fixed mount. There's no communication between either radio. Took out my ART-2 antenna tester and it was well within specs. Tuned to channel 9, 16, 68, 69 and was able to send and receive on both radios.

Is there any reason why?
Thanks in advance for the advice.

Dean
The reason why you can't hear on your other radio is because channel 26 and 27 are duplex channels and the other channels are simplex. Duplex means it transmits and receives on different frequencies. Simplex means it transmits and receives on the same frequency.

When you transmit on a duplex channel, you are transmitting on a different frequency than your other radio is listening for, that's why you can't hear it. that's also why when you listen to channel 27 for radio checks, you can only hear the responses from the base station, and not the original radio check call from other boaters.

Why you are not getting response from SeaTow, well I don't know!

DUPLEX EXPLAINED:
http://www.thecoastalpassage.com/vhf.html
Old 07-12-2014, 08:55 AM
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Thank you for putting that in a very clear and concise response! I've read about duplex and simplex but couldn't see where those two channels were specifically mentioned as being affected.

Thanks again!
Old 07-12-2014, 09:37 AM
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You should call the local Sea Tow station and discuss. Does this happen even when you are close to them? I have had times here in NC when the service was off line.
Old 07-12-2014, 07:01 PM
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Originally Posted by caltexflanc View Post
You should call the local Sea Tow station and discuss. Does this happen even when you are close to them? I have had times here in NC when the service was off line.
Where in NC are you?
Old 07-13-2014, 04:38 AM
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Originally Posted by Crabpot Man View Post
Where in NC are you?
Morehead City / Cape Lookout. This was last year. I really like this service and wish everyone would use it; when it wasn't working, I got good checks from other sources.
Old 07-13-2014, 05:55 AM
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Originally Posted by caltexflanc View Post
Morehead City / Cape Lookout. This was last year. I really like this service and wish everyone would use it; when it wasn't working, I got good checks from other sources.
Just checking, as not all the ARC systems are at Sea Tow locations.
Old 07-13-2014, 07:26 AM
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I had same issue in Port St Joe Friday. Maybe something was wrong with their system. Might try again today.
Old 07-14-2014, 04:23 AM
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Was out on the water yesterday. Called up SeaTow on the VHF. They said their ARC in Hilton Head was online but St. Catherine's was not even though it showed as online when you checked the website. Lady on the radio was very nice, gave me feedback on how well I was being received on two different towers she had access to and could hear me on. A+ for SeaTow.

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