[Elecraft] K3S poor CW keying further investigation
hawley, charles j jr
c-hawley at illinois.edu
Sat Apr 25 15:11:13 EDT 2020
Wonder what the time constant is for a remote sense power supply.
Jack BMW Motorcycles
Chuck KE9UW
c-hawley at illinois.edu
Sent from my iPad
> On Apr 25, 2020, at 2:00 PM, Pete Lascell <plascell at gmail.com> wrote:
>
> To bad the power supply doesn't have remote voltage sense to regulate at the far end of the 12 volt power cable.
> Pete W4WWQ
>
> ----- Original Message -----
> From: <donovanf at starpower.net>
> To: <elecraft at mailman.qth.net>
> Sent: 4/25/2020 2:47:12 PM
> Subject: Re: [Elecraft] K3S poor CW keying further investigation
> ________________________________________________________________________________
>
> Hi Pete,
>
>
> The K3 100 watt power amplifier includes a 25 amp circuit breaker
> on the rear panel of your radio. The rest of the K3 electronics is
> protected by an internal 5 amp self resetting fuse.
>
>
> There's absolutely no need for external fuses, except in a mobile installation
> where external fuses are required in both the positive and negative power
> leads to avoid a possibly disastrous automotive fire.
>
>
> 73
> Frank
> W3LPL
>
> ----- Original Message -----
>
> From: "N4ZR" <n4zr at comcast.net>
> To: "Martin Sole" <hs0zed at gmail.com>, elecraft at mailman.qth.net
> Sent: Saturday, April 25, 2020 4:54:37 PM
> Subject: Re: [Elecraft] K3S poor CW keying further investigation
>
> Thanks, Martin - I take it all back - my radio drops the voltage down to
> 11.0 volts at 100 watts key down. I'm really surprised, because I
> figured that the breakers in the 4005i wouldn't have so much drop.I'll
> have to figure out how best to siamese my power supply output so that it
> goes both to the RigRunner and directly to the radio. That'll leave the
> power supply's fusing as the only protection for the radio, but I guess
> that's OK.
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
>
>> On 4/25/2020 12:24 PM, Martin Sole wrote:
>> DISP and rotate vfo B for desired measurement option.
>>
>> Martin, HS0ZED
>>
>>
>>
>>> On 25/04/2020 23:19, N4ZR wrote:
>>> That's right - my focus was (perhaps too narrowly) on the behavior of
>>> the power supply under load, not on losses in the system. Now if
>>> someone can just tell me how to read the voltage at the transceiver -
>>> I know there's a menu setting somewhere but my radio is fairly early
>>> and the manual doesn't say.
>>>
>>> 73, Pete N4ZR
>>> Check out the Reverse Beacon Network
>>> at <http://reversebeacon.net>, now
>>> spotting RTTY activity worldwide.
>>> For spots, please use your favorite
>>> "retail" DX cluster.
>>>
>>> On 4/25/2020 11:25 AM, hawley, charles j jr wrote:
>>>> I did notice that the post mentioned that his power supply dipped in
>>>> voltage but as for preventing issues due to low voltage, it's not
>>>> your voltmeter on the power supply that is the proper indicator. It
>>>> is the voltage on the input to the K3 that you should be noting.
>>>> It's available on the menu and displays in the VFO B area on the
>>>> screen.
>>>>
>>>> Jack BMW Motorcycles
>>>> Chuck KE9UW
>>>> c-hawley at illinois.edu
>>>>
>>>> Sent from my iPad
>>>>
>>>>> On Apr 25, 2020, at 9:51 AM, N4ZR <n4zr at comcast.net> wrote:
>>>>>
>>>>> 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
>>>>> Check out the Reverse Beacon Network
>>>>> at <http://reversebeacon.net>, now
>>>>> spotting RTTY activity worldwide.
>>>>> For spots, please use your favorite
>>>>> "retail" DX cluster.
>>>>>
>>>>>> 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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