[Elecraft] DC to DC Converter
I use a 2 KW pure sine wave DC to AC inverter in our travel trailer. The 60 Hz THD is less than 3% as measured.I find it works quite nice, handles the necessary equipment including the microwave, starts the compressor on the 5 cu. ft. refrigerator and best of all, it doesn't cause noise on the HF transceiver. One does have to be mindful of power management. The transceiver does connect direct to the 12V battery system.I've not had any experience with DC to DC converters. 73 Bob, K4TAX On 10/2/2015 11:54 PM, Bill Frantz wrote: As I run my K3 from batteries at home, and am about to run in from batteries in Sierra county for the California QSO party -- no generators permitted where we are. I need battery power for my normal operations. If higher voltages are needed to clean up the amp, how about a DC to DC converter. 73 Bill AE6JV __ 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] SS30DV feedback
Thanks very much for the feedback from SS30DV users I think I have good recommendation for it. Now QRT 73, Jorge CX6VM/CW5W -Mensaje original- De: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] En nombre de Joe Subich, W4TV Enviado el: sábado, 03 de octubre de 2015 10:19 a.m. Para: elecraft@mailman.qth.net Asunto: Re: [Elecraft] SS30DV feedback > If higher voltages are needed to clean up the amp, how about a DC to > DC converter. How about a higher voltage battery system rather than added complexity in the transceiver? 73, ... Joe, W4TV On 10/3/2015 12:54 AM, Bill Frantz wrote: > As I run my K3 from batteries at home, and am about to run in from > batteries in Sierra county for the California QSO party -- no > generators permitted where we are. I need battery power for my normal operations. > If higher voltages are needed to clean up the amp, how about a DC to > DC converter. > > 73 Bill AE6JV > > On 10/2/15 at 2:10 PM, rmcg...@blomand.net (Bob McGraw - K4TAX) wrote: > >> To me the real solution is to incorporate an internal power supply. > - > Bill Frantz| Re: Hardware Management Modes: | Periwinkle > (408)356-8506 | If there's a mode, there's a | 16345 Englewood Ave > www.pwpconsult.com | failure mode. - Jerry Leichter | Los Gatos, CA > 95032 > > __ > 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 > li...@subich.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 cx6vm.jo...@gmail.com --- El software de antivirus Avast ha analizado este correo electrónico en busca de virus. https://www.avast.com/antivirus __ 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] two 2.7khz filters available
I have a pair of 2.7khz filters available if anyone is interested. I just replaced them with 2.8khz filters. Make me a reasonable offer for both. Rich - N5ZC __ 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] Cheap ref osc to lock K3
LA3ZA used a UBLOX NEO-7 GPS unit to lock his K3. This $20 unit including complete development board can be obtained here. http://www.ebay.co.uk/itm/301199083821 It's tiny, has a patch antenna (although a $10 active antenna works better) and consumes under 60ma. It can be powered from +5v or a USB port. It fits in a 2"x3" box. Once set up it is stand alone not requiring a computer connection. There was some question as to whether the jitter of the unit would disqualify it as a decent ref osc. A posting on the SpectrumLab group indicated that it seems quite adequate for K3 disciplining. spectrumlabus...@yahoogroups.com Accuracy within 0.02 to 0.03 Hz of a Rb standard. Output spectrum seems to indicate that jitter is not a problem for this purpose. 73 de Brian/K3KO __ 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] SS30DV feedback
If higher voltages are needed to clean up the amp, how about a DC to DC converter. How about a higher voltage battery system rather than added complexity in the transceiver? 73, ... Joe, W4TV On 10/3/2015 12:54 AM, Bill Frantz wrote: As I run my K3 from batteries at home, and am about to run in from batteries in Sierra county for the California QSO party -- no generators permitted where we are. I need battery power for my normal operations. If higher voltages are needed to clean up the amp, how about a DC to DC converter. 73 Bill AE6JV On 10/2/15 at 2:10 PM, rmcg...@blomand.net (Bob McGraw - K4TAX) wrote: To me the real solution is to incorporate an internal power supply. - Bill Frantz| Re: Hardware Management Modes: | Periwinkle (408)356-8506 | If there's a mode, there's a | 16345 Englewood Ave www.pwpconsult.com | failure mode. - Jerry Leichter | Los Gatos, CA 95032 __ 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 li...@subich.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] SS30DV feedback OT
With predistortion coming sooner or later to mainstream radios, higher PA voltage for 100W is dead issue. Ignacy -- View this message in context: http://elecraft.365791.n2.nabble.com/Re-SS30DV-feedback-OT-tp7608653p7608665.html Sent from the Elecraft mailing list archive at Nabble.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
[Elecraft] WTB: K3 ATU
Got one to sell? Let me know. Pete Meier pme...@me.com Amateur Radio Callsign: WK8S || If you make people think they're thinking, they'll love you. But if you really make them think, they'll hate you - Don Marquis || __ 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] New K3/K3S firmware handles CR/LF characters in RTTY and PSK modes
Hi all, We're looking for a few testers for the latest K3/K3S field-test firmware. This rev fulfills a long-standing request to properly handle carriage-return (CR) and line-feed (LF) characters in our built-in data modes, FSK-D and PSK-D. CR and LF characters are used for screen formatting, automatic spotting sequences, etc. FSK-D and PSK-D modes use the radio's DSP for encode/decode, with text input provided via an attached CW keyer paddle, a keyboard connected to a P3, or from any computer application that can send remote control commands to the radio. One of these applications is K3 Utility. It includes a Terminal screen that works in RTTY/PSK31/CW modes. (We have a bit more work to do in K3 Utility to handle CR & LF characters in transmit mode, as I'll explain in my instructions for using the new firmware.) This release also fixes a recently discovered PTT bug. Unexpected ERR PTT and ERR KEY messages were being displayed if the operator activated PTT, then tapped A/B, etc. If you have time to test these improvements in the short term -- preferably this weekend, so we can go to beta next week -- please contact me directly. 73, Wayne N6KR __ 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] SS30DV feedback OT
With bias, 12V transistors are class B or AB, not C. See http://flarc.net/eme-info/PDF/N1JEZ-2.pdf. He describes an amp changed to Class B (very low bias for little heating). Regular IMD3 -22db. After predistortion -55db. Plus extra db in additional power power. All for a cost of feedback + some programming. With predistortion we can get more power (drive closer to saturation) with less heating (higher efficiency and lower quiescent current) and less IMD. All for a cost of hardware feedback + programming. I am all for 50V (or higher) for high power amps. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/Re-SS30DV-feedback-OT-tp7608653p7608673.html Sent from the Elecraft mailing list archive at Nabble.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] SS30DV feedback OT
On 10/3/2015 10:14 AM, Ignacy wrote: With predistortion coming sooner or later to mainstream radios, higher PA voltage for 100W is dead issue. Ignacy Higher voltage PA and predistortion are completely separate items. Even with predistortion, good engineering principles mean higher voltage transistors one should be used for 100W class rigs. Most 50 or 60 W "12V" transistors are class C devices (a pair for "100 W") ... predistortion is not going to make class C finals clean enough for reasonable SSB. Modern "12V" radios are 10 dB or more dirtier than older generation tube transceivers. 73, ... Joe, W4TV __ 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] Just good enough 10 MHz reference
I have now posted a full description of my just good enough 10 MHz reference based on the Ublox Neo-7M 12-13 USD GPS on my blog: http://la3za.blogspot.com/2015/10/just-good-enough-10-mhz-reference.html?spref=tw It has photos and schematics and shows how it affects the K3's reference oscillator from initial start-up until it's warm. - Sverre, LA3ZA K2 #2198, K3 #3391, LA3ZA Blog: http://la3za.blogspot.com, LA3ZA Unofficial Guide to K2 modifications: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html -- View this message in context: http://elecraft.365791.n2.nabble.com/Just-good-enough-10-MHz-reference-tp7608672.html Sent from the Elecraft mailing list archive at Nabble.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
[Elecraft] KAT100 Pre-wound Toroids for sale
Hello everyone, I have an extra set of pre-wound toroids for the KAT100 auto-tuner for sale. These are from Mychael Morohovich and are of his normal very high quality. I got them with a KAT100 kit but I prefer to wind the toroids myself. Mychael gets $37.50 plus $8.00 for postage. I will sell the exact same toroid set for $30 shipped via Priority Mail in the US. Doug W4DAS __ 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] (K3) filter setting shifts panadapter display
I have a K3 [w/ new synthesizer], an LP-Pan, M-Audio Delta, and running NaP3v4. K3 filters are: 2.7/8p, 1.9/8p, 500/8p, 200/5p. Not sure "where" this is happening, but decided to start here. On CW, using the K3 CWT to center a signal, the pan display frequency for the signal shifts around as follows: Filter Freq Display 2.7 2,104cps high 1.9 1,580cps high 500 888cps high 200 1,730cps high Note, NaP3's "global offset" is zero'd on WWV at 10MHz. I've reached a barren bottom trying to figure this out, and I'd appreciate any wisdom that others have to offer. Thanks. ...robert -- Robert G Strickland, PhD ABPH - KE2WY rc...@verizon.net.usa Syracuse, New York, USA __ 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
