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  Standard-Horizon VHF Marine Band Radio Microphone Hanger Switch

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Author Topic:   Standard-Horizon VHF Marine Band Radio Microphone Hanger Switch
towboater posted 11-30-2011 08:24 AM ET (US)   Profile for towboater   Send Email to towboater  
I [have] noticed the microphone holder button on my Standard Horizon VHF [Marine Band radio] grounds out when it touches metal on my [aluminum] console and reverts back to Channel-16. Another Standard radio I own has a plastic holder button. No big deal, just curious: what purpose is served by having the holder button [act as a switch]? This model is probably 10 years old, works great. Thanks in advance to any replies.--mkj
dfmcintyre posted 11-30-2011 06:02 PM ET (US)     Profile for dfmcintyre  Send Email to dfmcintyre     
Our Icom in the big boat does the same. Safety feature to revert back to 16. I've seen other installations where the mike holder bracket clip jobbeedo thingee is actually wired back to the radio to accomplish same.

Regards - Don

David Pendleton posted 11-30-2011 08:00 PM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
Interesting, I've never heard of such a thing.

jimh posted 11-30-2011 11:31 PM ET (US)     Profile for jimh  Send Email to jimh     
Having a Microphone hanger switch is a very common feature on commercial radios. One typical function is to remove the CTCSS when the microphone comes out of the hanger. This avoids someone transmitting on a channel that is in use.

Read the instruction book for your radio. It probably explains the feature. There may be a way to defeat the hanger switch if you don't want to use it.

jimh posted 11-30-2011 11:37 PM ET (US)     Profile for jimh  Send Email to jimh     
CTCSS = continuous tone coded squelch system, or Private Line (from Motorola) or PL, or sub-tone squelch.
David Pendleton posted 12-01-2011 12:26 AM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
Being an active user of several local repeaters, I'm well aware of what CTCSS is.

I'm not making the connection between CTCSS and placing your radio's mike in it holder switching back the VHF channel 16.

What am I missing? My Raymarine VHF radio does not exhibit this behavior.

jimh posted 12-01-2011 12:00 PM ET (US)     Profile for jimh  Send Email to jimh     
ASIDE on CTCSS and Microphone Hanger Switches:

Assume that many users or firms or services share a channel, but each company or firm or service uses their own CTCSS signal. CTCSS keeps the channel silent for mobile stations until there is traffic for them. By having a microphone hanger switch configured to disable CTCSS, when a mobile operator picks up a microphone to transmit, the CTCSS is disabled and the mobile receiver reverts to noise squelch mode. In noise squelch mode the receiver will un-mute if there is any traffic on the channel. This alerts the operator not to transmit on top of another user, who might already be on the channel but not using the same CTCSS.

This was a common arrangement at one time in mobile radio service. Today, with digital radios, perhaps this is no longer used. However, it is not particularly strange or rare.

As for how S-H is using a microphone hanger switch in their VHF Marine Band radios, I can't say, but I bet their instruction manual explains it clearly. From the narrative, it sounds like the microphone hanger switch is used to revert the radio to Channel 16. In this way, when the operator puts the microphone back in the hanger switch, the radio reverts to Channel 16. This helps with compliance that vessels equipped with a VHF Marine Band radio must maintain a radio watch on Channel 16 when they are not using the radio for other communications.

Chuck Tribolet posted 12-01-2011 01:04 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
The S-H website has a good selection of manuals in PDF format.

I'll bet there's way to disable it. It's common on vessels
of some size to have two radios, one of which is kept tuned
to 16, and the other to one or more working frequencies.
The "back to 16" function would need to be disabled on the
working frequency radio.


Chuck

towboater posted 12-02-2011 02:51 AM ET (US)     Profile for towboater  Send Email to towboater     
Thanks for editing my typo's and gramatical mess Jim.

Just curious if there was some safety aspect involved?
And, a little bored...hehe.
Are there any bases left that havent been covered here?

It is a very heavy duty mike, and probably a metal flange inside, metal screws hold things together. The mike hangs from the overhead about shoulder level so the holster button grounding isnt a problem unless I extend it on rare occasions.

Thanks for all the input on this very critical issue.
Happy Holidays.
Alls well here, busy.

Pretty sure I will be selling the 18 and F70 when things settle down. Probably separate.

Mike

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