[Elecraft] Elecraft CW Net Announcement
Good Evening, It has not snowed in three days. Rain has melted most of what is left. This year there is little runoff; it is soaking into the ground rather than causing floods. I did not know the ground was so dry up here. The forest should have good growth. Golden crowned kinglets are back, searching for seeds. The sun is mostly bare but still caused a radio black out today. AR3272 showed up two days ago and has been active ever since. I expect noise and QSB for both nets tomorrow. Hopefully we can work them in between solar events. Please join us on (or near): 14050 kHz at 2200z Sunday (3 PM PDT Sunday) 7047 kHz at z Monday (5 PM PDT Sunday) 73, Kevin. KD5ONS - Kirchhoff's other laws: https://math.nyu.edu/~estarose/ew_articles/mention/PhysFluids_22_024104_LIM.pdf https://www.hindawi.com/journals/jcmp/2014/650365/ https://graphics.pixar.com/library/CurlyHairA/paper.pdf https://hal.inria.fr/inria-00520270/document __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Looking FOR K2 KNB2 AND KAT2 From WD4X.
Looking For Elecraft KNB2 And KAT2, Used Or New. Thank You, 73's From WD4X 239-227-9414. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [P3] P3 woes - repaired but now claims my K3s puts out 873W!
It's always seemed to me that Poynting's Vector is the most aptly named entity in mathematics. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County Edward Mccann wrote on 4/7/2023 7:41 PM: Dave: You may have redefined Poynting’s Theorem! Ed McCann On Apr 7, 2023, at 6:23 PM, Dave New, N8SBE wrote: Don, The KPA500 (and K3s) both show the correct wattage - 100W barefoot and about 26W out of the K3s when the KPA500 is inline, and about 500W out of the KPA500. I tried changing the P3 SensorCal value from 500 (default) to 350 (min) but that only dropped the wattage shown by a little less than half. 73, -- Dave, N8SBE On 2023-04-07 16:48, W3FPR wrote: Dave, What power is displayed on the KPA500? The KPA500 would fault if indeed the K3s is putting out that much power. The KPA500 power bar is pretty accurate, just a bit coarse in its increments. I think a power calibration is in order for the P3 power indicator. 73, Don W3FPR On 4/7/2023 2:12 PM, Dave New, N8SBE wrote: So, I was the guy that had a P3 display/boot problem recently. I sent it to the mother ship for repair, and they found that (get this) the 12V supply was shorted to the 3.3V supply (eep!). So, a new(er) I/O board (which contains the supplies) and a replacement blown 3.3V LCD controller later, I have an (almost) fully functional P3 again. EXCEPT, the TX Monitor function is now funky. It claims that my K3s is putting out 873 (or so) watts! I've tried both sensors (I had a 200W HF sensor on the shelf since I added a KPA500 and changed to a 2KW HF sensor), and although the scale max changes on the P3 display when I change sensors, it still way overstates my output power. The KPA500 is showing 1360 watts on the P3! I unplugged/re-plugged everything, did a visual inspection of the TX Monitor adapter board under a lighted magnifying glass, looking for missing/broken SMD resistors or caps, but so far no soap. I'm wondering if the new revision I/O board is somehow incompatible with the older TX Monitor board, or maybe there is a missing 1M-ohm resistor to ground on the I/O board at the sensor connector, or an incorrect series resistor value there. And yes, I sent a note to support, but I haven't heard back, yet. Wondering if anyone (Alan?) has any ideas where this behavior is coming from. The wattmeter in both my K3s and KPA500 are working normally. It's just the P3 wattmeter that's gone off the deep end, now. Thanks, and 73, -- Dave, N8SBE __ Elecraft mailing list Home:http://mailman.qth.net/mailman/listinfo/elecraft Help:http://mailman.qth.net/mmfaq.htm Post:mailto:Elecraft@mailman.qth.net This list hosted by:http://www.qsl.net Please help support this email list:http://www.qsl.net/donate.html Message delivered tow3fpr...@gmail.com __ Elecraft mailing list Home:http://mailman.qth.net/mailman/listinfo/elecraft Help:http://mailman.qth.net/mmfaq.htm Post:mailto:Elecraft@mailman.qth.net This list hosted by:http://www.qsl.net Please help support this email list:http://www.qsl.net/donate.html Message delivered toedwmcc...@gmail.com __ Elecraft mailing list Home:http://mailman.qth.net/mailman/listinfo/elecraft Help:http://mailman.qth.net/mmfaq.htm Post:mailto:Elecraft@mailman.qth.net This list hosted by:http://www.qsl.net Please help support this email list:http://www.qsl.net/donate.html Message delivered tok6dg...@gmail.com -- This email has been checked for viruses by AVG antivirus software. www.avg.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [P3] P3 woes - repaired but now claims my K3s puts out 873W!
Wait, shouldn’t the sensor be before the antenna tuner? I don’t think a sensor should be connected where it’s not 50 ohms. Al W6LX/4 > On Apr 7, 2023, at 9:22 PM, Dave New, N8SBE wrote: > > Alan, > > I tried changing the SensorCal entry, but you are correct there isn't enough > range. It only cut the reading by less than half. > > When I change the MtrScale entry, it changes the meter scale, but it still > shows over 800W (and runs over the smaller scales) in text on the screen. > > I did a visual inspection of the sensor board, but without a schematic I > couldn't check the resistor and capacitor values. I couldn't find a > schematic for the P3 TX Mon sensor board. Do you have one handy? I did find > schematics for the sensors themselves in the W2 documentation. > > And yes, the SWR is way low, about 1.5, compared to what my KAT500 shows for > the antenna side of the tuner (I have one of those display boxes on the > KAT500, so I can see all the tuner values). I have the P3 sensor between my > KAT500 and the antenna feedline using a short coax jumper between the KAT500 > and the sensor, which is currently going to a 75 ft coax run to a ZS6BKW > window-line fed dipole in an inverted vee configuration. In the past, I've > seen 'raw' SWR of 2.5 to 4:1 or so on 80m in particular. On 40m right now, I > have 2.93 antenna SWR shown on the KAT500, which is corrected to 1.18 SWR > reflected back to the KPA500 or the K3s if the KPA500 is in bypass mode. > Given my setup, the P3 SWR should agree closely with the KAT500 antenna-side > SWR, but it is about half. > > 73, > -- Dave, N8SBE > >> On 2023-04-07 17:15, Alan Bloom wrote: >> Hi Dave, >> There is a "SensorCal" entry in the Transmit Monitor Menu, but I don't >> think it has enough range to correct such a large error. >> There is also a "MtrScale" entry to set the full-scale power on the >> meter display. Does the reading change when you change the scale? >> In addition to the I/O board, the problem could also be on the Sensor >> board (the small board that connects the sensor RJ45 connector to the >> I/O board). If one of the resistors on this board went open or >> shorted it could cause a power error. Is the reverse power reading >> way off as well? (i.e. does the SWR read wrong for SWR not close to >> 1:1?) If so, that could be due to a resistor problem on the Sensor >> board. >>> I'm wondering if the new revision I/O board is somehow incompatible with >>> the older TX Monitor board, >> No I don't think so. There was a minor change in the sensor design at >> one point but it was just a capacitor change to improve the detected >> bandwidth so the envelope would display correctly. (The same sensors >> are used for the W2 wattmeter.) >> 73, >> Alan N1AL >>> On 4/7/23 12:12, Dave New, N8SBE wrote: >>> So, I was the guy that had a P3 display/boot problem recently. >>> I sent it to the mother ship for repair, and they found that (get this) the >>> 12V supply was shorted to the 3.3V supply (eep!). >>> So, a new(er) I/O board (which contains the supplies) and a replacement >>> blown 3.3V LCD controller later, I have an (almost) fully functional P3 >>> again. >>> EXCEPT, the TX Monitor function is now funky. It claims that my K3s is >>> putting out 873 (or so) watts! I've tried both sensors (I had a 200W HF >>> sensor on the shelf since I added a KPA500 and changed to a 2KW HF sensor), >>> and although the scale max changes on the P3 display when I change sensors, >>> it still way overstates my output power. The KPA500 is showing 1360 watts >>> on the P3! >>> I unplugged/re-plugged everything, did a visual inspection of the TX >>> Monitor adapter board under a lighted magnifying glass, looking for >>> missing/broken SMD resistors or caps, but so far no soap. >>> I'm wondering if the new revision I/O board is somehow incompatible with >>> the older TX Monitor board, or maybe there is a missing 1M-ohm resistor to >>> ground on the I/O board at the sensor connector, or an incorrect series >>> resistor value there. >>> And yes, I sent a note to support, but I haven't heard back, yet. Wondering >>> if anyone (Alan?) has any ideas where this behavior is coming from. The >>> wattmeter in both my K3s and KPA500 are working normally. It's just the P3 >>> wattmeter that's gone off the deep end, now. >>> Thanks, and 73, >>> -- Dave, N8SBE >>> __ >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to n8...@densbe.com > __ > Elecraft mailing list > Home:
Re: [Elecraft] K2-Bias Resistor When Using Mic Connector Pin 1 for Soundcard Input
On 07/04/2023 23:48, elecraft-requ...@mailman.qth.net wrote: I'd like to connect a sound card output to a K2 mic connection. Does this bias resistor need to be removed when I connect the sound card output? Electret microphones, like the MH2, MH3, MH4 require a bias voltage to function. On the K2, this is done by "adding a 5K6 resistor between pin 1 and 6". That also works on the K3, but the K3 also has an option in the menu to set enable a bias resistor in the rig - if you do that, you don't need the physical resistor but you need to remember to do the setting. Personally, I worry about the chance of doing this wrong (either bias for a soundcard or a dynamic microphone, or forgetting the bias on an electret) and hence said 5K6 bias resistor is in the microphone plug. If I plug in an electret microphone, it will get bias, if I plug on something else, I don't need to worry, and this will work on K2 and K3, w/o any menu setting changes. Geert Jan __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
