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" <n...@comcast.net> To: "Martin Sole" <hs0...@gmail.com>, elecraft@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-haw...@illinois.edu >>> >>> Sent from my iPad >>> >>>> On Apr 25, 2020, at 9:51 AM, N4ZR <n...@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 >>>>>> <donandde...@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:anyone1...@gmail.com> >>>>>> Sent: Saturday, April 25, 2020 9:03 AM >>>>>> To: Bob McGraw K4TAX<mailto:rmcg...@blomand.net> >>>>>> Cc: Elecraft@mailman.qth.net<mailto:Elecraft@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 >>>>>>> <rmcg...@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 >>>>>>>> >>>>>>> ______________________________________________________________ >>>>>>> Elecraft mailing list >>>>>>> Home: >>>>>> https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7C851d0737e47443117ae408d7e9216b51%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637234202046704357&sdata=ungsv%2Fp%2BttMdFv1pen3cIlx6vdo6lgKCjXn4vvBnIgI%3D&reserved=0 >>>>>> >>>>>> >>>>>>> Help: >>>>>> https://eur04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=02%7C01%7C%7C851d0737e47443117ae408d7e9216b51%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637234202046704357&sdata=FSSRNX8wMACqNS%2BQ1XwUQPLzjJH3fCS8HnUiSFvElgk%3D&reserved=0 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