[Elecraft] K3S poor CW keying further investigation
N4ZR
n4zr at comcast.net
Sat Apr 25 10:49:18 EDT 2020
For whatever it may be worth, my K3 is run through a West Mountain
RigRunner 4005i, and the voltmeter on my SEC 1235M doesn't even flicker
when I go key-down at 100 watts.
I'm wondering if a 25-amp-rated supply (perhaps a little optimistic)
might be to blame. My K3 draws 20.2 amps at 100 watts key down.
73, Pete N4ZR
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On 4/25/2020 10:32 AM, Jim Rhodes wrote:
> I had been using a power pole strip to power everything. After seeing some
> discussion on this topic some time ago I found that in the string of 3
> power pole connections in my setup at the time I was seeing around a 1 volt
> drop in the voltage on the K3 metering between receive and 100 watts
> keydown. That voltage drop was confirmed by my VOM so I wired the rig
> directly to the supply and the voltage drop was less than 0.25 volts. That
> is the way my rigs and VHF/UHF amps will be connected from now on with only
> a fuse inline. The low current stuff will stay on the power pole strip
> where they do just fine lighting up lights and stuff.
>
> On Sat, Apr 25, 2020, 09:16 Don Schroder <donanddeena at hotmail.com> wrote:
>
>> Bob,
>>
>> Is it safe to run my K2 using Anderson Power Pole connections, and/or
>> RigRunner equipment?
>>
>> For my info, what is the reason for NOT using them?
>>
>> I’m rewiring, and I want to do it right!
>>
>> Gunny, KE0PVQ
>>
>> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows 10
>>
>> From: Gmail<mailto:anyone1545 at gmail.com>
>> Sent: Saturday, April 25, 2020 9:03 AM
>> To: Bob McGraw K4TAX<mailto:rmcgraw at blomand.net>
>> Cc: Elecraft at mailman.qth.net<mailto:Elecraft at mailman.qth.net>
>> Subject: Re: [Elecraft] K3S poor CW keying further investigation
>>
>> Nuts, just measure the drop between radio and power supply see if it is
>> reasonable. Mine is 0.25 volts when transmitting. I run 14.0 out of supply.
>> Ray
>> W8LYJ
>>
>> Sent from my iPad
>>
>>> On Apr 25, 2020, at 07:48, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
>>>
>>> As to the RigRunner power pole strip.........PUT IT IN THE TRASH where
>> it belongs. NEVER NEVER NEVER use a power distribution strip to power a
>> 100 watt radio. ALWAYS connect the radio direct to the power supply
>> terminals. NO exceptions!
>>> 73
>>>
>>> Bob, K4TAX
>>>
>>>
>>>> On 4/25/2020 7:13 AM, Chuck Chandler wrote:
>>>> After more checking, I suspect the internal 100W amp is the common
>> factor
>>>> in the poor keying characteristics I'm seeing and hearing about from my
>>>> rig. I am trying to determine if my power supply is doing it's job.
>>>>
>>>> I'm using a TenTec 963 switching supply rated at 25A continuous. At
>> rest
>>>> the K3S panel display shows 13.6V, with full power key down it dips to
>> 11.5
>>>> or so. This seems like a lot. I'm running the power cable thru a
>>>> RigRunner Powerpole strip. If I can dig out another power supply from
>> the
>>>> packed boxes I can wire the K3S directly to the supply.
>>>>
>>>> Is 11.5V at key down enough to cause the slow rise time being reported?
>>>>
>>>> 73 de Chuck, WS1L
>>>>
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