[Elecraft] K3 - Power cable voltage drop

[hawley, charles j jr]

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 <rmcgraw at blomand.net> 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 <radiok4ia at gmail.com> 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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> 
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