Copper Talk » Open Forum » Archived Messages » 2003 » 09/01/2003 to 09/30/2003 » Power Supply « Previous Next »

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Rfman100
Posted on Saturday, September 13, 2003 - 11:11 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
I want to better understand which power supply to use. Suppose I have a mobile 10 meter radio & I use it at my place, I would need to use a power supply.

Ok, I have a 3 amp to use. But what if I used a 10 or more amps? Would this be an improvment? Would it be better for recieving DX?

Thanks.
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Bman02
Posted on Saturday, September 13, 2003 - 3:29 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
You will not benefit from a power supply with more amperage than your radio needs.For a 10 meter mobil you will need a little more than a three amp power supply if you talk on sideband.A 7-10 amp power supply would work perfect.As far as recieving dx goes, yor radio uses very little power when receiving and like i said a bigger power supply will not help.How well your radio recieves is all in your antenna setup.
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Bigbob
Posted on Saturday, September 13, 2003 - 7:21 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
And whatever you use do not use a 12-volt battery charger,or unregulated power supply,you need a fully regulated and overvoltage protected power supply,such as Tripp Lite or Radio shack.
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Rfman100
Posted on Sunday, September 14, 2003 - 1:24 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
I am mostly interested in recieving DX. Couldn't I use a preamp? Could I have more then one preamp & have them all connected together?

And yes I do know that the signal comes in stronger, but so does the noise. Is there some that could cut down the noise & not the signal?

Thanks.
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Bigbob
Posted on Sunday, September 14, 2003 - 5:31 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
Look for the ones that have low noise f e t's.
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Bigbob
Posted on Sunday, September 14, 2003 - 10:07 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
Having two in series would be like having 2 amps of same size in series,you would overload the second one and blow the transistors.
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Kc0gxz
Posted on Monday, September 15, 2003 - 12:07 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
Rfman100

I second everything Bigbob said except for buying a Radio Shack power supple.

Copper has better power supplys for less money.

Jeff, kc0gxz.
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de
Posted on Monday, September 15, 2003 - 1:12 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)
The problem with a preamp is that if you use just a regular audio amp you will amplify both the signal AND the stuff you don,t want (static, bleedover, etc).

Try doing a search of Amateur Radio software programs that use the soundcard of your computer to act as an Audio Filter. Most are free for the download and they just might work.