Another thing you can do is use a Kill-A-Watt or similar plug in AC power meter
and a
high load item like a heat gun to verify the voltage drops in your system. I
found that
some of my 30 year old screw type outlets had developed excessive voltage drop
from
I assume the copper wire cold flowing under the screw heads. With replacement
outlets
so cheap it's worth replacing them rather than just tightening.
I started on this crusade when the outlet feeding a microwave oven started
giving
off that distinctive hot wire smell.
Mark. N2QT
>
>> On Apr 11, 2014, at 5:25 AM, "Dale J." <dj2001x@comcast.net> wrote:
>>
>> I've been reading the mail on this. Some time ago at Home Depot, I
>> purchased a little device that tests electrical outlets for proper
>> connections and the safety ground. Very inexpensive and easy to use.
>> Sometimes checking house wiring for proper connections can reveal some
>> interesting results. I found two outlets that I thought had proper safety
>> grounds when they really didn't. It also checks the proper neutral and hot
>> wiring to the outlets.
>>
>> I have two Astron 35 M supplies, one is at least 20 years old and the other
>> about a year old. Have not experienced the hum trouble here, but the old
>> Astron has failed a couple times.
>>
>> Just my .02
>> GL & 73
>> Dale, K9VUJ
>>
>>
>>> On 11, Apr 2014, at 0:49, Gary Smith <Gary@ka1j.com> wrote:
>>>
>>> A couple of things...
>>>
>>> I took Jim's advice and stocked up on #31 ferrites, bought a bunch of
>>> them, more than I'll probably ever use but I'm going to put them on
>>> every power outlet possible, I've already started making up extension
>>> cords to be clamped with the ferrites and from that, to a power
>>> strip. Where that's not practical, every wall wart will have turns of
>>> the wire ferrited. You get the idea. The noise I hear and see on the
>>> P3 is now remarkably reduced.
>>>
>>> I've had more noise in my HI-Z Rx antenna than I think I should have
>>> so I put these ferrite clamp-ons at each end of the coax (in loops)
>>> to each antenna and at the end at the control box. Same for all the
>>> other coax involved in the HI-Z and it has made a difference but I'm
>>> really not sure why.
>>>
>>> As to the Keurig & the Astron... I do love the Keurig, I use the
>>> refillable coffee holders and it does make a fine cup but I digress.
>>> As was mentioned earlier, the Astron was terribly made as regards
>>> grounding. The wire grounding from the negative DC out was bolted to
>>> the chassis but it was on paint on both sides and the round plug was
>>> attached to the chassis exactly the same way. I connected both of
>>> these ring terminals to one bolt and removed the paint on both sides
>>> to make a true ground.
>>>
>>> I tried figuring out what was making the hum in the Astron when the
>>> Keurig was on and it seems to be coming from the transformer (which
>>> is really warmer than I expected). I removed the DC connection and
>>> just had the Astron plugged into the AC and I still was hearing that
>>> intermittent humming when the Keurig was on. Nothing I could press on
>>> in the PS made the noise stop. I finally put three large ferrite
>>> clamp-ons with three loops each on the power cord to the Astron and
>>> now I can still hear the hum but now it's greatly reduced and hard to
>>> hear over the fan in the amp, so that is a real bit of progress.
>>>
>>> 73,
>>>
>>> Gary
>>> KA1J
>>>
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