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Re: K3 - Power cable voltage drop

Posted by Vic Rosenthal on Dec 25, 2019; 5:33am
URL: http://elecraft.85.s1.nabble.com/K3-Power-cable-voltage-drop-tp7657290p7657391.html

I have a Fluke DVM also. I gulped when I bought it some 30+ years ago, but it was a good decision. It’s like a Snap-On wrench. It just feels right and never let me down.

Victor 4X6GP

> On 25 Dec 2019, at 4:29, hawley, charles j jr <[hidden email]> wrote:
>
> I have a Fluke 87...for a couple of decades now. It does it all well.
>
> Chuck Jack Hawley
> KE9UW
>
> Sent from my iPhone, cjack
>
>> On Dec 23, 2019, at 10:31 PM, Bob McGraw K4TAX <[hidden email]> wrote:
>>
>> A good, known accurate DVM is an asset to any station.  Use it to determine if the others are accurate.  There are several good brands available.   A DVM that is not accurate is worse than no DVM at all.  
>>
>> My choice of many years ago is my Fluke 77.   After I tapped it with too much voltage, I sent it to Fluke for repair and calibration.  I am confident when I make a measurement it is accurate without question.
>>
>> Bob, K4TAX
>>
>>
>> Sent from my iPhone
>>
>>>> On Dec 23, 2019, at 2:12 PM, Buck <[hidden email]> wrote:
>>>
>>> The reliable place to measure the voltage at the K3x is using the supply voltage display meter in the radio.  I was surprised to find mine was significantly low.  I thought it was voltage drop but changing the supply cable didn't make much difference.
>>>
>>> Turns out the Astron power supply was more than a volt low and the meter on the supply had been cranked up to make it appear to be correct.  I used two separate VOMs to set the power supply and then adjusted the meter to make it agree.
>>>
>>> Moral of the story: don't rely on the meter on the power supply and assume a low reading at the radio is due solely to voltage drop.
>>>
>>>
>>>
>>> Buck, k4ia
>>> Honor Roll
>>> 8BDXCC
>>> EasyWayHamBooks.com
>>>
>>>>> On 12/23/2019 2:26 PM, Phil Kane wrote:
>>>>> On 12/22/2019 9:44 AM, Bob McGraw wrote:
>>>>> I also added a dedicated ground between the ground screw on the back of
>>>>> the radio to the ground screw on the power supply.
>>>> That's for "bonding".  Where do you pick up "ground" - at the radio, at
>>>> the PS, or at some other point?
>>>> 73 de K2ASP - Phil Kane
>>>> Elecraft K2/100   s/n 5402
>>>> From a Clearing in the Silicon Forest
>>>> Beaverton (Washington County) Oregon
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