Wonder what the time constant is for a remote sense power supply. Jack BMW Motorcycles Chuck KE9UW [email protected]
Sent from my iPad > On Apr 25, 2020, at 2:00 PM, Pete Lascell <[email protected]> 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: <[email protected]> > To: <[email protected]> > 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" <[email protected]> > To: "Martin Sole" <[email protected]>, [email protected] > 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 >>>> [email protected] >>>> >>>> Sent from my iPad >>>> >>>>> On Apr 25, 2020, at 9:51 AM, N4ZR <[email protected]> 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 >>>>>>> <[email protected]> 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:[email protected]> >>>>>>> Sent: Saturday, April 25, 2020 9:03 AM >>>>>>> To: Bob McGraw K4TAX<mailto:[email protected]> >>>>>>> Cc: [email protected]<mailto:[email protected]> >>>>>>> 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 >>>>>>>> <[email protected]> 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: >>>>>>> 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>>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support 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