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Boat Forum / Electronics / June 2008Marine Radio install question
Hey All, I'm about to install a Jensen stereo (Model MSR2007) in my Robalo. There is a blue wire coming out of the radio's harness that is marked "Power Antenna". Any idea what that should be connected to? It is not the Antenna connection which is a whole seperate connector on the other side of the radio. Also, there is no mention of connecting any wire from the radio directly to the battery for a continious power source. The main lead (red wire) is supposed to be connected to +12 switched. The old radio (that I removed) had a wire connected directly to the battery with a small plastic fuse casing in the middle. Do modern radios use a different method to maintain memory when the power is switched off? Any thoughts would be appreciated. Thanks, Rob > Hey All, > [quoted text clipped - 3 lines] > not the Antenna connection which is a whole seperate connector on the > other side of the radio. Most probably a wire to power the motor of a car antenna, which automatically extends when you switch on the radio. > Also, there is no mention of connecting any wire from the radio > directly to the battery for a continious power source. The main lead > (red wire) is supposed to be connected to +12 switched. The old radio > (that I removed) had a wire connected directly to the battery with a > small plastic fuse casing in the middle. Do modern radios use a > different method to maintain memory when the power is switched off? Yes, non-volatile memory chips. Meindert On Jun 26, 9:43 am, "Meindert Sprang" <m...@NOJUNKcustomORSPAMware.nl> wrote: > > Hey All, > [quoted text clipped - 17 lines] > > Meindert Thank you. Great info. Rob > Most probably a wire to power the motor of a car antenna, which > automatically extends when you switch on the radio. I agree, it's very likely there to trigger a power antenna. You could use it with a relay to trigger an amp (you can't power the amp through it, of course). >> Also, there is no mention of connecting any wire from the radio >> directly to the battery for a continious power source. The main lead [quoted text clipped - 4 lines] > > Yes, non-volatile memory chips. But what about the clock? Internal battery (aka planned obsolescence)? >>> Also, there is no mention of connecting any wire from the radio >>> directly to the battery for a continious power source. The main lead >>> (red wire) is supposed to be connected to +12 switched. The old radio >>> (that I removed) had a wire connected directly to the battery with a >>> small plastic fuse casing in the middle. Do modern radios use a >>> different method to maintain memory when the power is switched off? In UK there is often a constant 12v feed which if disconnected requires you to re-enter the security code for reasons of anti-theft. Maybe your old radio had this feature, or just needed power for the memory & clock. > > Yes, non-volatile memory chips. > > But what about the clock? Internal battery (aka planned obsolescence)? Very likely. I have seen a lot of equipment with internally soldered LiIon batteries, lasting about 10 years. Then they need to be replaced. GPS receivers from Garmin are a nice example, as are (ham-) radios from Yaesu. Meindert >> Also, there is no mention of connecting any wire from the radio >> directly to the battery for a continious power source. The main lead [quoted text clipped - 4 lines] > > Yes, non-volatile memory chips. Actually new (2008 model) Sony and Alpine car stereos DO loose stored radio channels when power is disconnected. Most of them are used in cars and most cars have a ignition key (suprise ;) seems like the engineers at Sony and Alpine haven't thougt about yachts. One would belive that today when flash memory etc. is very cheap it would be used for this, but the fact is that I have not seen any models that keep the channel settings after power is disconnected. On most steres the yellow wire is battery +12V, red is via ignition key +12V and black 0V. Regards, TomS > >> Also, there is no mention of connecting any wire from the radio > >> directly to the battery for a continious power source. The main lead [quoted text clipped - 22 lines] > Regards, > TomS Yeah something is holding on to the stored radio presets, because all I have connected is through +12 switched and the radio presets do stick around even after a complete disconnect of the batteries. Thanks to all for the help on this install, it went great and the boat goes in the water today. |
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