RE: [baofeng_uv5r] Power output with different battery packs


Feb 14, 2015

 


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#48528 Feb 14, 2015

Interesting thread. I am sure the Baofeng UV5 radios, .use a voltage regulator to provide constant voltage to the electronics. As has been said in several different ways so far, it doesn't matter what the battery supply voltage is because the regulator will do its job to insure the correct pre-established voltage is supplied to the solid state devices.ChuckKC9KC



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#48530 Feb 14, 2015

Actually, it does matter what the supply voltage is. It has been shown through the use of AA-cell battery packs that if the supply voltage can be too high. When it is slightly above 8.5 volts (as would be the case with 6 alkaline cells - 9 volts), TX is inhibited. Replace one of the alkaline cells with a shunt (dropping it to 7.5 volts) or use 6 ni-cad rechargable cells (7.2 volts), and all is well.

Jim KC9HI

On Sat, Feb 14, 2015 at 10:26 AM, Chuck Burns cebur19@... [baofeng_uv5r] baofeng_uv5r@yahoogroups.com> wrote:

.Interesting thread. I am sure the Baofeng UV5 radios, .use a voltage regulator to provide constant voltage to the electronics. As has been said in several different ways so far, it doesn't matter what the battery supply voltage is because the regulator will do its job to insure the correct pre-established voltage is supplied to the solid state devices.ChuckKC9KC



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#48531 Feb 16, 2015

But Jim, he wasreferring to low wattage out put of the radio due to low voltage of the batteries, does the same go for this scenario?KB9OAUJames

To: baofeng_uv5r@yahoogroups.comFrom: baofeng_uv5r@yahoogroups.comDate: Sat, 14 Feb 2015 15:52:11 -0500Subject: Re: [baofeng_uv5r] Power output with different battery packs

��Actually, it does matter what the supply voltage is. It has been shown through the use of AA-cell battery packs that if the supply voltage can be too high. When it is slightly above 8.5 volts (as would be the case with 6 alkaline cells - 9 volts), TX is inhibited. Replace one of the alkaline cells with a shunt (dropping it to 7.5 volts) or use 6 ni-cad rechargable cells (7.2 volts), and all is well.

Jim KC9HI

On Sat, Feb 14, 2015 at 10:26 AM, Chuck Burns cebur19@... [baofeng_uv5r] baofeng_uv5r@yahoogroups.com> wrote:

��

Interesting thread. I am sure the Baofeng UV5 radios, ��use a voltage regulator to provide constant voltage to the electronics. As has been said in several different ways so far, it doesn't matter what the battery supply voltage is because the regulator will do its job to insure the correct pre-established voltage is supplied to the solid state devices.ChuckKC9KC



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#48545 Feb 16, 2015

The only way you can lower the output of the radio from battery characteristics is if you restrict the current.The voltage doesn't matter since the radio won't even run with low voltage���it shuts off.So if you put a honker-watt resistor between the battery and the radio you COULD possibly lower the transmit power.That's what happens to old NiCad batteries���they lose the amp hour rating and eventually can't deliver enough amps to give full power to the radio���still puts out the voltage though as the battery charger will tell you they are charged.I've never heard of this with LiPo batteries.�� I believe old LiPos still put out the same amps���but they have less capacity so don't last as long as they get older. ��If somebody knows different about LiPos please speak up. ��Mike W9MDB ��From: Michael Black [mailto:mdblack98@...] Sent: Monday, February 16, 2015 12:54 PMTo: baofeng_uv5r@yahoogroups.comSubject: RE: [baofeng_uv5r] Power output with different battery packs



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#48546 Feb 16, 2015

All batteries will show a higher internal resistance as they get used, even the Li chemistry.. It's just that the voltage under load curve is a lot flatter for Li cells.. The number of recharge cycles is different.. NiCds can be from 500-1000 depending how you take car of them.. MNiH are similar., maybe a little less. The Li chemistry are about 300 cycles.but since their power density is greater, the same size battery will last longer so you don't have to recharge as often.. Kind of gives them an advantage.. They self-discharge very slowly too.. NiCds come next and NiMH self-discharge quickest.

Bob

On Mon, Feb 16, 2015 at 2:03 PM, 'Michael Black' mdblack98@... [baofeng_uv5r] baofeng_uv5r@yahoogroups.com> wrote:

.The only way you can lower the output of the radio from battery characteristics is if you restrict the current.The voltage doesn't matter since the radio won't even run with low voltage.it shuts off.So if you put a honker-watt resistor between the battery and the radio you COULD possibly lower the transmit power.That's what happens to old NiCad batteries.they lose the amp hour rating and eventually can't deliver enough amps to give full power to the radio.still puts out the voltage though as the battery charger will tell you they are charged.I've never heard of this with LiPo batteries.. I believe old LiPos still put out the same amps.but they have less capacity so don't last as long as they get older..If somebody knows different about LiPos please speak up..Mike W9MDB.From: Michael Black [mailto:mdblack98@...] Sent: Monday, February 16, 2015 12:54 PMTo: baofeng_uv5r@yahoogroups.comSubject: RE: [baofeng_uv5r] Power output with different battery packs



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#48557 Feb 16, 2015

Michael, I would hope that you have heard of Ohm's Law.���� Thereis no way to "restrict the current" without reducing the voltage.��When a device attempts to "regulate current" what it actually changes isthe VOLTAGE.���� Adding resistance simply provides a voltage drop acrossthe resistor, which in turn lowers the voltage across the other component.����From: mailto:baofeng_uv5r@yahoogroups.comSent: Monday, February 16, 2015 14:03 PMTo: baofeng_uv5r@yahoogroups.comSubject: RE: [baofeng_uv5r] Power output with different batterypacks







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#48564 Feb 17, 2015

I agree juan...

From: baofeng_uv5r@yahoogroups.comTo: baofeng_uv5r@yahoogroups.comDate: Mon, 16 Feb 2015 14:15:08 -0500Subject: Re: [baofeng_uv5r] Power output with different battery packs

��Michael, I would hope that you have heard of Ohm's Law.���� Thereis no way to "restrict the current" without reducing the voltage.��When a device attempts to "regulate current" what it actually changes isthe VOLTAGE.���� Adding resistance simply provides a voltage drop acrossthe resistor, which in turn lowers the voltage across the other component.����From: mailto:baofeng_uv5r@yahoogroups.comSent: Monday, February 16, 2015 14:03 PMTo: baofeng_uv5r@yahoogroups.comSubject: RE: [baofeng_uv5r] Power output with different batterypacks



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