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ContinuousWave: Small Boat Electrical
Standard-Horizon VHF Marine Band Radio Microphone Hanger Switch
|Author||Topic: Standard-Horizon VHF Marine Band Radio Microphone Hanger Switch|
posted 11-30-2011 08:24 AM ET (US)
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
posted 11-30-2011 06:02 PM ET (US)
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
posted 11-30-2011 08:00 PM ET (US)
Interesting, I've never heard of such a thing.
posted 11-30-2011 11:31 PM ET (US)
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.
posted 11-30-2011 11:37 PM ET (US)
CTCSS = continuous tone coded squelch system, or Private Line (from Motorola) or PL, or sub-tone squelch.
posted 12-01-2011 12:26 AM ET (US)
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.
posted 12-01-2011 12:00 PM ET (US)
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.
posted 12-01-2011 01:04 PM ET (US)
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
posted 12-02-2011 02:51 AM ET (US)
Thanks for editing my typo's and gramatical mess Jim.
Just curious if there was some safety aspect involved?
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.
Pretty sure I will be selling the 18 and F70 when things settle down. Probably separate.
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