[Elecraft] K3S poor CW keying further investigation
Bob McGraw K4TAX
rmcgraw at blomand.net
Sat Apr 25 10:56:41 EDT 2020
Jim et al:
Thank you for confirming exactly what I've written and suggested.
TO ALL........PLEASE do not use power strips to supply DC to your radio
from your power supply. ALWAYS connect the radio direct to the power
supply terminals. The power pole and DC distributions strips are ok
for LED lightning and such but NEVER for anything drawing over about 2
amps. I don't care what the manufacturer says they are "rated" for.
E = I x R. Every connections adds resistance. Do the math.
73
Bob, K4TAX
On 4/25/2020 9:32 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
> <mailto: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
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>
> From: Gmail<mailto:anyone1545 at gmail.com <mailto:anyone1545 at gmail.com>>
> Sent: Saturday, April 25, 2020 9:03 AM
> To: Bob McGraw K4TAX<mailto:rmcgraw at blomand.net
> <mailto:rmcgraw at blomand.net>>
> Cc: Elecraft at mailman.qth.net
> <mailto:Elecraft at mailman.qth.net><mailto: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
> <mailto: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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