Author Topic: My kenwood handheld whines with NiMh batteries  (Read 3467 times)

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GreekMan

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My kenwood handheld whines with NiMh batteries
« on: April 06, 2016, 03:25:08 PM »
indeeed!

if it try to use it with NiMhs in the battery case -and a tone is used- it makes a low whining noise, which can be heard on the other end.
And as luck has it, today that i set up to record it on both ends, (TX, RX) it does not do it.  :o

The thing i have seen before, with a fieldr epeater we set with my club runnign on 12V batteries.

Now i know there is no way of troubleshooting it, but it would eb good to know he why of it.

spacecase0

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Re: My kenwood handheld whines with NiMh batteries
« Reply #1 on: April 06, 2016, 06:32:40 PM »
my guess is that the radio is not getting quite enough voltage as the NiMh batteries are lower voltage than alkaline
I have a radio that does a similar thing because it needs just a bit more voltage to run correctly

AD

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Re: My kenwood handheld whines with NiMh batteries
« Reply #2 on: April 06, 2016, 06:56:21 PM »
Interesting GM.  Is this reported else where or are you "special"  :o
The only dumb question is the one that did not get asked!!

ghrit

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Re: My kenwood handheld whines with NiMh batteries
« Reply #3 on: April 06, 2016, 07:05:44 PM »
indeeed!

if it try to use it with NiMhs in the battery case -and a tone is used- it makes a low whining noise, which can be heard on the other end.
And as luck has it, today that i set up to record it on both ends, (TX, RX) it does not do it.  :o

The thing i have seen before, with a fieldr epeater we set with my club runnign on 12V batteries.

Now i know there is no way of troubleshooting it, but it would eb good to know he why of it.
Does it do it with the stock batts?
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GreekMan

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Re: My kenwood handheld whines with NiMh batteries
« Reply #4 on: April 07, 2016, 12:24:58 AM »
no, just the NiMhs...
wroks good with anyotehr way to power it. battery, Lithiums, alkalines, extrenaly lithium-ion, 12V car, 12v SLA.

spacecaeO.....I can try it with 5xNimhs, but i will hav to make a special wire

AD, honestly I ddi not check the web for being that "special"  ;D

Tevin

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Re: My kenwood handheld whines with NiMh batteries
« Reply #5 on: April 07, 2016, 07:01:13 AM »
Interesting GM.  Is this reported else where or are you "special"  :o

I did a cursory Google search https://www.google.com/search?client=safari&rls=en&q=kenwood+radio+whines+with+nimh+battery&ie=UTF-8&oe=UTF-8#q=kenwood+radio+whines+with+nimh+battery&start=10

Nothing relevant to Greek Man's problem came up, so I'm going to say he's "special".

My guess is that the lower voltage is making something oscillate, and it's getting into the audio. I think it's easier to just use a different battery than try to troubleshoot and repair the problem.

GreekMan

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Re: My kenwood handheld whines with NiMh batteries
« Reply #6 on: April 07, 2016, 04:06:55 PM »
indeed i dis such a search myself afterwards, and did not get anything.
I even used the word "squeal" Nothing!

So this afternoon i tried with discharged batteries and will still won't replicate the phenomenon.
Hope it stays this way.
in the past it as done it with Eneloops, Uniross Hybrios and the abtts there are on now, Lidl Black LSDs (Tronic)

It is still an interestign phenomenon -remember the club repeater instance- cos it will pyt you out of action.

Oh by the way....it is better to have a whinny radio than a whinny wife!

AD

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Re: My kenwood handheld whines with NiMh batteries
« Reply #7 on: April 07, 2016, 08:08:36 PM »

Oh by the way....it is better to have a whinny radio than a whinny wife!

When you fogure out how to stop the second one please let me know  8)
The only dumb question is the one that did not get asked!!

RickyTerzis

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Re: My kenwood handheld whines with NiMh batteries
« Reply #8 on: September 12, 2017, 11:03:55 AM »
Hi...i am a new user here. As per my knowledge  the radio is not getting quite enough voltage as the NiMh batteries are lower voltage than alkaline.I have a radio that does a similar thing because it needs just a bit more voltage to run correctly.

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« Last Edit: October 20, 2017, 09:44:28 AM by RickyTerzis »

ghrit

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Re: My kenwood handheld whines with NiMh batteries
« Reply #9 on: September 12, 2017, 12:43:26 PM »
Hi...i am a new user here. As per my knowledge  the radio is not getting quite enough voltage as the NiMh batteries are lower voltage than alkaline.I have a radio that does a similar thing because it needs just a bit more voltage to run correctly
Take a look at the specs for your radio.  You'll see that battery voltage is lower than 12 volts, there is circuitry that takes the charging voltage and drops it to what the radio wants.  At least that's how it is with my TH-F6.  YMMV, depending on your radio.  I'm suspicious that it is NOT a battery problem.  (But if you have another or different battery, it's time for a swap test.)
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GreekMan

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Re: My kenwood handheld whines with NiMh batteries
« Reply #10 on: September 15, 2017, 01:44:22 AM »
hmmm. I think RT (Terzis as in the Greek Terzis surname?) may have a point
i had a look in the radio's manual and it says...
Quote
Operating Voltage
DC IN jack DC 12.0 ~ 16.0 V (13.8 V nominal)
Battery terminal DC 5.5 ~ 7.5 V (7.4 V nominal)

so..it is easy to try it with Five nimhs, but that will take some time to make the fixture etc.