yup the battery tender unit’s throw out a lot of RFI for sure and have also
noticed moderate life spans on there switchers. However Their transformer unit
is rfi quiet and lasts a long time.
never tried the battery minder units.
myles Landstein
myles.landstein@gmail.com
> On Sep 29, 2018, at 6:22 PM, Grant Saviers <grants2@pacbell.net> wrote:
>
> I have found the "Battery Minder" products quiet and reliable. Not to be
> confused with Battery Tender which have had a high failure rate for me. The
> Minder brand uses a pulse charge float technology and has recovered partially
> sulfated batteries for me and has the lowest water loss of any float charger
> I have used.
>
> Two are on 24x7 24v 2 to 4a outside (48v x 220AH), one 12v 1a outside on 24x7
> (12v x100AH), and one inside 12v 2a on 24x7 (12v x 220AH). I haven't added
> chokes on any of them.
>
> Not cheap but worth it as batteries really last and are always ready to go.
>
> Grant KZ1W
>
> On 9/29/2018 13:52 PM, Randall K Martin wrote:
>> I have been trying to solve an interference problem for quite a while here
>> at my QTH. Symptom is that when I transmit on 40M CW, even at QRP power
>> levels using bandpass filters and transmitting stubs, the second harmonic on
>> 20M is a wide signal, covering 30-40 KHz. As per advice given by Frank W3LPL
>> regarding RF flooding, I started searching for an electrical device
>> (probably charger/wall wart).
>>
>> I eliminated my own home as the source by testing with battery power and all
>> circuit breakers turned off. Through more testing, I found that even at 100
>> milliwatt output on 40M, I still got the 20M wide band hash, but only when I
>> pointed my 40M antenna at my neighbors house.
>>
>> Today, I got together with the neighbor and he let me snoop around with a
>> portable Rx. Voila! Culprit is a cheap little trickle charger.
>>
>> DBT Auto Electrical Products PTE LTD Part no. 021-0123
>> "Household automotive battery charger" 120V input and 12V output at 750 mA
>>
>> Question: Is there a battery charger that any of you can recommend? I tried
>> wrapping the 12V leads of the current charger roughly 10 x through a large
>> toroid and there was little if any reduction in interference.
>>
>> 73 Randy K0EU
>>
>>
>>
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>>
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