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Dual use of Cockpit Speakers??
I have a pair of speakers in the cockpit coaming for the AM/FM radio..
I would like to figure out a way to connect the VHF external speaker to one of these, so I can hear any calls on it in scan or monitoring of ch16. Both radios are below deck so I can only hear them in the cockpit on a remote speaker.. I know I could just use a toggle switch, but would prefer to find a way to combine both outputs so the VHF would be heard over the AM/FM output. Is there a simple way to do this and prevent one unit from harming the other?? Steve s/v Good Intentions |
Dual use of Cockpit Speakers??
On Wed, 4 Feb 2004 08:45:08 -0800, "Steve" wrote:
I have a pair of speakers in the cockpit coaming for the AM/FM radio.. I would like to figure out a way to connect the VHF external speaker to one of these, so I can hear any calls on it in scan or monitoring of ch16. Both radios are below deck so I can only hear them in the cockpit on a remote speaker.. I know I could just use a toggle switch, but would prefer to find a way to combine both outputs so the VHF would be heard over the AM/FM output. Is there a simple way to do this and prevent one unit from harming the other?? Steve s/v Good Intentions Two methods come to mind: The first is the "simple" way...use an andio transformer for each channel. The transformer would have two primary windings, and one secondary, which would drive the speakers. One primay is connected to the sound system, the other to the VHF radio. A little more complicated way would be to use a VOX (voice operated relay) connected to the VHF, which would disconnect the stereo, and cut thru the VHF. This has the advantage of cutting out the stereo when the VHF is active. I lied..there are three methods....the third is a combination of the first two., except now the stereo is reduced by a certain amount when the VHF is active. HTH Norm |
Dual use of Cockpit Speakers??
On Wed, 04 Feb 2004 17:52:39 -0800, engsol
wrote: On Wed, 4 Feb 2004 08:45:08 -0800, "Steve" wrote: I have a pair of speakers in the cockpit coaming for the AM/FM radio.. I would like to figure out a way to connect the VHF external speaker to one of these, so I can hear any calls on it in scan or monitoring of ch16. Both radios are below deck so I can only hear them in the cockpit on a remote speaker.. I know I could just use a toggle switch, but would prefer to find a way to combine both outputs so the VHF would be heard over the AM/FM output. Is there a simple way to do this and prevent one unit from harming the other?? Steve s/v Good Intentions Two methods come to mind: The first is the "simple" way...use an andio transformer for each channel. The transformer would have two primary windings, and one secondary, which would drive the speakers. One primay is connected to the sound system, the other to the VHF radio. A little more complicated way would be to use a VOX (voice operated relay) connected to the VHF, which would disconnect the stereo, and cut thru the VHF. This has the advantage of cutting out the stereo when the VHF is active. I lied..there are three methods....the third is a combination of the first two., except now the stereo is reduced by a certain amount when the VHF is active. HTH Norm No you can't do that with a transformer! The transformer is not going to isolate one radio from the other. Just because it has two primary windings will not keep one radio from feeding into the other. A transformer does not know primary from secondary. The vox idea would work though. But it is so much simpler to use 2 speakers. Regards Gary |
Dual use of Cockpit Speakers??
Steve wrote:
I have a pair of speakers in the cockpit coaming for the AM/FM radio.. I would like to figure out a way to connect the VHF external speaker to one of these, so I can hear any calls on it in scan or monitoring of ch16. Both radios are below deck so I can only hear them in the cockpit on a remote speaker.. I know I could just use a toggle switch, but would prefer to find a way to combine both outputs so the VHF would be heard over the AM/FM output. Is there a simple way to do this and prevent one unit from harming the other?? Steve s/v Good Intentions Why don't you simply connect on of these speakers to the VHF and leave the other connected to the AM/FM radio? Please don't tell me that this would destroy the stereo effect, there probabl;y isn't any stereo effect where they are, in the cockpit combing Remove "nospam" from return address. |
Dual use of Cockpit Speakers??
Steve wrote:
Is there a simple way to do this and prevent one unit from harming the other?? Look at general aviation intercoms of the portable variety. They are designed to mute the entertainment audio when a communications radio becomes active. The price may be a bit high but you may find a used one on Ebay and there are kit options available from places like RST in Grass Valley CA. Rick |
Dual use of Cockpit Speakers??
There are several ways to do it but I would not recommend it. A decent
audio speaker has to much range for a VHF audio output. The wide response range will make the sound muddy and harder to understand. VHF speakers have very narrow response range on purpose. It makes the sound crisper. Steve wrote: I have a pair of speakers in the cockpit coaming for the AM/FM radio.. I would like to figure out a way to connect the VHF external speaker to one of these, so I can hear any calls on it in scan or monitoring of ch16. Both radios are below deck so I can only hear them in the cockpit on a remote speaker.. I know I could just use a toggle switch, but would prefer to find a way to combine both outputs so the VHF would be heard over the AM/FM output. Is there a simple way to do this and prevent one unit from harming the other?? Steve s/v Good Intentions -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
Dual use of Cockpit Speakers??
Please post a followup if you find out how to do this.
I was unsucesful in doing this in my boat, a 19' runabout. I tried using a double pole double throw switch so that I could hear either the VHF radio or the AM/FM/Casette Player from the stereo speakers in the rear of the boat. My intent was to be able to select which radio was heard over the stereo speakers. I settled for a headphone and separate mini speaker for the VHF radio. "Steve" wrote in message ... I have a pair of speakers in the cockpit coaming for the AM/FM radio.. I would like to figure out a way to connect the VHF external speaker to one of these, so I can hear any calls on it in scan or monitoring of ch16. Both radios are below deck so I can only hear them in the cockpit on a remote speaker.. I know I could just use a toggle switch, but would prefer to find a way to combine both outputs so the VHF would be heard over the AM/FM output. Is there a simple way to do this and prevent one unit from harming the other?? Steve s/v Good Intentions |
Dual use of Cockpit Speakers??
wrote in message
... On Fri, 6 Feb 2004 07:56:10 -0800, "William G. Andersen" Using a toggle switch to suddenly remove the load from the output of the Stereo probably isn't such a great idea. Oh boy. There this myth again. This is no problem at all. Meanwhile the one really useful comment I saw was that stereo speakers really aren't ideal for VHF anyway. Indeed famous for VHF or any radio use are speakers from Peiker. They act like a voice band filter, giving you superb voice quality. Meindert |
Dual use of Cockpit Speakers??
wrote in message
... On Fri, 6 Feb 2004 17:21:14 +0100, "Meindert Sprang" wrote: Based on what? Running a high powered amp without a proper load on it can cause rapid failure. Give me one reason why.... (audio amp, that is. HF/VHF is a different story) Meindert |
Dual use of Cockpit Speakers??
I agree, get an aviation interface that has an entertainment channel. The
more expensive panel mount audio panels may not have the frequency response for stereo though. Most aviation panels are designed to pass the standard communications 300-3300 Hz frequencies, and not hi-fi entertainment. Ask before you buy though, as the entertainment channel may only be monaural, not stereo as the entrainment source on a small plane is frequently the ADF switched to the Am broadcast band. Thanks Rick for mentioning RST...I just checked their website. I thought they went out of business years ago due to a divorce or something. Nice to see Jim is back in business again. He used to make aviation test equipment and even a transceiver kit, that you sent back end after assembly for final alignment and FCC/FAA sticker. Doug K7ABX, formerly owned by Beech Musketeer N2392L "Rick" wrote in message link.net... Steve wrote: Is there a simple way to do this and prevent one unit from harming the other?? Look at general aviation intercoms of the portable variety. They are designed to mute the entertainment audio when a communications radio becomes active. The price may be a bit high but you may find a used one on Ebay and there are kit options available from places like RST in Grass Valley CA. Rick |
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