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older standard eclipse, ch 27,28

Old 09-02-2017, 08:16 AM
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Default older standard eclipse, ch 27,28

I have an older standard eclipse fixed mount vhf radio mounted in my wellcraft center console that doesn't seem to transmit on ch 27 or 28.

Other channels (16,9,78a) work fine, can tx and rx and audio is great. I've tested with a brand new known good standard hx870 vhf in the yard, not seeing any rx when I key the mic on 27 or 28 on the older radio. Nor does the older eclipse see any rx when I key the mic on my good radio on 27 or 28. 27 and 28 are simplex channels if I remember, but that shouldn't be an issue?

Did something change in recent years with 27 and 28? Or maybe my old radio just has some issues (recently installed new antenna) ?

Thanks
Old 09-02-2017, 02:33 PM
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duh, learning moment on my side, guy another forum reminded me "Any boat radio can transmit on channels 27, 28, but you won't ever be able to hear yourself on another boat radio as it listens to the shore side frequency, not the frequency you're transmitting on" maybe this'll help someone else.
Old 09-02-2017, 09:58 PM
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Are they both in same country mode? Ie usa / int / can.
Old 09-02-2017, 11:20 PM
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Originally Posted by gulfsand View Post
duh, learning moment on my side, guy another forum reminded me "Any boat radio can transmit on channels 27, 28, but you won't ever be able to hear yourself on another boat radio as it listens to the shore side frequency, not the frequency you're transmitting on" maybe this'll help someone else.
That's right, except of course the shore station is monitoring the same freq. you Tx on, otherwise it would never hear your Tx.

. They are "duplex" channels and Tx from your VHF on freq.(X) to a special shore station (such as Seatow's automated radio check response station) which receives it on freq.(x) .
The shore station then responds on freq.(y) which is the freq. your radio monitors/Rx when set to one of those duplex stations.

But since your VHF is only monitoring freq. (y) on that channel , it will not hear another standard marine VHF radio transmitting [ freq. (x) ] on that channel.
That should be confusing enough.

If you are in range and hail the SeaTow automated -response shore station , you should be able to get a response which includes a recorded playback of your whole hail .
https://www.seatow.com/service-locat...r-option=boats

Any marine VHF channel on this list with Tx freq. different from Rx freq. is "duplex" .:
https://www.seatow.com/service-locat...r-option=boats

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