I just love these dim witted touch screens. Apparently I bumped the send icon
before it's time. I was going to mention that I have had the pleasure of being
in a QSO when the electric utility failed. My all-battery station did not miss
a beat:)
Of course, I do not charge the batteries that are in use. Conducted noise from
the power lines ya know.
73,
Bill KU8H
> On Feb 18, 2025, at 8:00 AM, Bill Cromwell <wrcromwell@gmail.com> wrote:
>
>
> Hi,
>
> This must be the place for me to attach this thread. I started using
> batteries to power my receivers with vacuum tubes in them. OYYY! That
> eliminated conducted power line noise completely. It also eliminated annoying
> frequency changes when the furnace blower or AC kicked on or off.
>
> More recently the computer hardware has been the sore spot. Once again,
> batteries to the rescue. I have a very quiet mini PC. Just lucky I suppose.
> It runs on 12 volts DC but so far I am using with an analog AC energized
> power supply. I also have a small HDMI monitor that I power from a 12 volt
> battery. The wall wart that came with it was horrendous! That thing now
> resides in the landfill. the batteries I use now at full charge when fully
> charged provide approximately 14 volts and quickly come down into the 13ish
> volt range. It is possible to find quiet power banks for the "5 Volt" bits
> but four NiCad cells in series give us 5ish volts and at full charge do not
> exceed the manufacturer's published specs for maximum power supply voltage.
>
>>> On Feb 18, 2025, at 4:44 AM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>>>
>> On 2/17/2025 10:24 PM, Steve Harrison wrote:
>>> Only those that use a switcher for the regulator.
>>
>> Exactly, which I assumed Joe and others were smart enough to pick up from my
>> reference. :) Thanks for filling that in.
>>
>>> An oscilloscope is often a big
>>> help to find and suppress a noisy regulator chip.
>>
>> As are battery-operated receivers.
>>
>> 73, Jim K9YC
>>
>>
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