Re: [Elecraft] ACC1 via Bluetooth HC05 instead of KXSER ?
Have you considered the Piglet by pignoly.net ? The Piglet provides CAT via WiFi. 73, Yngvi TF3Y On Mon, Jun 18, 2018 at 1:36 PM John Newgas wrote: > I want to use my KX3 with a 12” Macbook for FT8 and other digi-modes but > it has only one USB port. > I thought it would be elegant and lightweight use a HC05 serial to > bluetooth adaptor module for the ACC1 interface to avoid cables like the > KXUSB or KXSER. > > The HC05 is designed for Arduino level 0 volt low and 3.3 volt high. > > Has anyone tried one of these directly with a KX3 ACC1 but without a > MAX232 level shifter ? Before building a small circuit board i thought it > worth asking if anyone else has already tried as I am naturally lazy type. > > John N > > > > __ > 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 t...@tf3y.net -- http://www.tf3y.net __ 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] [OT] KX2 on SOTA Activation in TF - TF/SV-041
I thought some here might enjoy some photos from my first SOTA activation using my brand new Elecraft KX2. This transceiver is absolutely brilliant for SOTA! Mine has the built in ATU and used the built in Lithium battery pack. The antenna was a 58' LW held up using a 13.5' fiberglass pole from sotabeams.co.uk with a 12.8' insultated counterpoise laying on ground. Everything performed perfectly. The farthes QSO was with K6MW in WA. Here is a link to the photos: https://photos.app.goo.gl/qLDY9cT6tWZaAdzm9 73, Yngvi TF3Y -- http://www.tf3y.net __ 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] Charging Lithium Ion batteries (KX2) from Car
Thanks Jim. I'll take a look at that one. I wasn't thinking about mobile operating but the KX2 would run directly off the car battery. Rather, I was thinking of what my possibilities were when I spend days away from an AC outlet..The Samlex inverter you show in your presentation clearly needs a LOT of additional filtering for your setup! Perhaps the folks at Elecraft have a good pointer.I think a mobile charger might be a good addition form some of us. 73, Yngvi TF3Y On Sun, Apr 15, 2018 at 8:18 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > On 4/15/2018 7:04 AM, Yngvi (TF3Y) wrote: > >> Are there recommended chargers for this? The Tenergy charger supplied by >> Elecraft runs from 100-240V range. >> > > If you don't mind the RF noise they produce, a small DC-AC inverter can be > a good solution. Slides 213-214 in http://k9yc.com/KillingRXNoise > Visalia.pdf show a small one that I bought to run a laptop in W6GJB's > truck for mobile contesting. This is the smallest model in their Pure Sine > Wave series, and it's much quieter than larger models in the same series, > which are too noisy use close to antennas. > > For others who suggested other DC chargers -- all forms of Li batteries > can easily be damaged if not charged per their design specs. Unless you > know those specs and can be certain to conform to them, stick with the > "official" charger. > > 73, Jim K9YC > __ > 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 t...@tf3y.net -- http://www.tf3y.net __ 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] Charging Lithium Ion batteries (KX2) from Car
For further clarification: The Lithium Ion battery packs supplied by Elecraft are 11.1v, 2.6Ah. I think the Tenergy charger supplied by Elecraft charges at 2000mA 73, Yngvi TF3Y On Sun, Apr 15, 2018 at 2:51 PM, Mike Furrey <mikefur...@att.net> wrote: > I am not sure what kind (size, shape) of Li batteries are in the KX2 but > as a caver I use 18650 Li batteries in my lights. I have found the Nitecore > D4 intelligent charger that works on both 120 VAC and 13 VDC that does a > good job of charging a variety of Li and Ni-cad batteries either at home or > one the road. > > 73, Mike WA5POK > > > On Sunday, April 15, 2018 10:06 AM, Yngvi (TF3Y) <t...@tf3y.net> wrote: > > > Hi folks. > > Just wondering how you go about charging the Elecraft supplied Lithium Ion > batteries for the KX2 from a car (13.8V) supply? > > Are there recommended chargers for this? The Tenergy charger supplied by > Elecraft runs from 100-240V range. > > Thanks, > Yngvi TF3Y > -- > http://www.tf3y.net > __ > 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 mikefur...@att.net > > > -- http://www.tf3y.net __ 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] Charging Lithium Ion batteries (KX2) from Car
Hi folks. Just wondering how you go about charging the Elecraft supplied Lithium Ion batteries for the KX2 from a car (13.8V) supply? Are there recommended chargers for this? The Tenergy charger supplied by Elecraft runs from 100-240V range. Thanks, Yngvi TF3Y -- http://www.tf3y.net __ 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] Summary of product review by PA0Q
I thought this summary might make an interesting read for some here http://www.remeeus.eu/hamradio/pa1hr/productreview.pdf 73, Yngvi TF3Y -- http://www.tf3y.net __ 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] Advice needed: Remote Station Enhancement
Hi Dennis. Have you checked what is available here: http://www.remoterig.com/wp/ 73, Yngvi TF3Y On Wed, Mar 7, 2018 at 1:30 AM, Dennis Ashworth <dennisashwort...@gmail.com> wrote: > My original post (below) morphed into a thread on standards, etc ... the > discussion was insightful and useful in defining my solution to question #1 > below. Thanks. > > Question #2 remains. How do I remotely switch between 4 positions on an RX > antenna switch (e.g. K9AY switch box) via some kind of Windows based UI. > Ideas? > > Thanks > Dennis, K7FL > > > Sent from my iPad > > Begin forwarded message: > > > From: Dennis Ashworth <dennisashwort...@gmail.com> > > Date: February 24, 2018 at 2:23:20 PM EST > > To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net> > > Subject: Advice needed: Remote Station Enhancement > > > > I’ve been remoting my K3, KPA500, KAT500 station via the RemoteRig boxes > and K3/0 mini for two years with solid results. Later this year, I want to > make several enhancements, including the replacement of the KPA500 and > KAT500 with a KPA1500. The amp/tuner should be a fairly straightforward > hardware replacement, but it does necessitate a few station changes which > I’m not certain how to implement. Let me explain and hopefully the masses > have ideas/approaches for consideration. > > > > 1. I feed a HyTower vertical (optimized for 40M & 80M) on all bands. > Where the driving impedance is close to 50 ohms on 40M & 80 (my bands of > interest) there has been no attempt to match the HyTower on other bands. > With the KAT500, matching was not a problem and I reduced mismatch losses > on the feed line by using hardline from the in-shack tuner to the antenna. > > > > When I switch to the KPA1500, operation on the unmatched bands might > prove problematic. To address this, I plan to provide switchable matching > networks to transform the HyTower drive impedance on each band to something > the KPA1500 can match. I can design the required impedance transformation > networks, but not sure how to automatically select the various (relay > based) impedance networks required for each band. Clearly, I need to grab > band data from the K3, but what’s the best hardware to use for this task? > > > > BTW, I want to power the KPA1500 ON with the K3, which requires a > Y-cable modification, or perhaps one of the N6TV boxes? > > > > 2. I want to interface a K9AY RX antenna 4 position switch to some sort > of UI that I can access remotely. I can design an electrical interface to > the K9AY switch, but controlling and monitoring remotely is the issue. > Ideas? > > > > 3. I have a Windows computer available at each end of the radio circuit. > The only other hardware is a SignalLink used for digital mods. > > > > 4. Configuring the station for future antenna enhancements (e.g. SteppIR > if we live long enough to see sunspots return!) are great if they come > without significant reliability impacts. > > > > Any ideas how to accomplish the required switching/monitoring? > > > > Thanks > > Dennis, K7FL > > Currently in Panama City, Florida > > Station in Battle Ground, WA > > > > > > > > > > > > Sent from my iPad > __ > 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 t...@tf3y.net -- http://www.tf3y.net __ 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] Minicircuits splitter for diversity?
Hi Jim. I have the PSC-4-6+ which I put in my own enclosure. I use that together with the DX-Engineering preamp. Before that I was using the DX-Engineering 2-port splitter but I needed more ports, i.e. this one https://www.dxengineering.com/parts/dxe-rsc-2 . The MiniCircuits one works fine.They also have units going much higher in frequency. 73, Yngvi TF3Y On Mon, Nov 6, 2017 at 1:13 PM, Jim Miller <j...@jtmiller.com> wrote: > I'm looking at this splitter to set up diversity for my K3s. It will only > be connected to RX paths. > > https://www.minicircuits.com/WebStore/dashboard.html?model=ZSC-2-1BR%2B > > It goes down to 100Khz and up to 400Mhz. > > BNC connections and a rear bracket make it fit well with my setup. > > Anyone see a problem with it? > > Price seems reasonable for something built with a nice metal case, BNCs and > quality. > > Suggestions? > > 73 > > jim ab3cv > __ > 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 t...@tf3y.net > -- http://www.tf3y.net __ 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] KX2 talk at Foothill ARS, Oct. 27th
Hi Wayne. Will your presentation be made available on-line later on? Thanks & 73, Yngvi TF3Y On Thu, Oct 26, 2017 at 2:55 AM, Wayne Burdick <n...@elecraft.com> wrote: > Hi all, > > I’ll be speaking about the KX2 at the FARS meeting this Friday night. > Among other topics, I’ll cover the KX2’s ancestral lineage (shamelessly > cherry-picked QRP rigs of yore), its technology and design goals, field > applications, and lightweight antennas. I’ll be bringing a prototype of the > Elecraft AX1 two-piece whip. > > FARS meetings are open to the public and all are invited. The meeting will > be in the multi-use room at Covington School, 205 Covington Road, Los > Altos. Nearest freeway exit is I-280 at El Monte Road. The school is about > 5 minutes from the intersection of Covington and El Monte Roads. Doors > open at 7 pm for socializing. Meeting starts at 7:30 pm. My presentation > will start between 7:45 and 8 pm. > > Hope to see some of you there. > > 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 t...@tf3y.net -- http://www.tf3y.net __ 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] Bluetooth audio adapter for K3
Has anyone used a Bluetooth adapter for wireless headphones / headset with the K3? Any recommendations or suggestions? What you stay away from? 73, Yngvi TF3Y -- http://www.tf3y.net __ 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] K3S QST Article
Many thanks for sharing this Jim. Very ambitious and informative. 73, Yngvi TF3Y On Tue, Oct 18, 2016 at 5:51 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > On Tue,10/18/2016 3:43 AM, Yngvi (TF3Y) wrote: > >> How fast does IMD deteriorate with increased power from the K3S or K3? >> >> What are the IMD figures when running 20-25W driving a linear amp. such as >> the KPA500? >> > > I've looked carefully at this, and so has my neighbor Bob Wolbert, K6XX, > who is an engineer at Elecraft and a serious contester. The first link > shows my measurements, the second is a pdf of the slides for a talk that > K6XX gave to NCCC three years ago. It includes measured data showing how TX > power out and DC voltage affect IMD. In my measurements, increased IMD > causes CW bandwidth to increase. You can see that difference by comparing > measurements at 30W, 50W, and 100W. > > http://k9yc.com/P3_Spectrum_Measurements.pdf > > http://k9yc.com/K6XXAmpTalk.pdf > > 73, Jim K9YC > > > __ > 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 t...@tf3y.net > -- http://www.tf3y.net __ 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] K3S QST Article
This is an interesting thread but I wonder about the practicalities... Of course we all want to emit a clean signal. In which cases might the IMD be a problem? Running full power off a battery with voltage dropping? Running almost full power to drive an older type tube amp? How fast does IMD deteriorate with increased power from the K3S or K3? What are the IMD figures when running 20-25W driving a linear amp. such as the KPA500? 73, Yngvi TF3Y On Tue, Oct 18, 2016 at 7:58 AM, David Gilbert <xda...@cis-broadband.com> wrote: > > 1. W4ATK seems overly indignant about a "compliance" spec he doesn't even > understand. > > 2. And while I've been a bit chagrined about it myself in the past, > anybody who doesn't understand that Elecraft's chosen business model is > centered around portable gear (which includes motor home and cabin > operations as opposed to just backpacking) hasn't been paying attention for > the last 20 years. > > Dave AB7E > > > > On 10/17/2016 4:47 PM, Kevin wrote: > >> Hmm, compliance with what? The rig meets Elecraft specs and since the FCC >> doesn't regulate TX IMD there is nothing to comply with. >> >> The problem I have is accepting the status quo by Elecraft. Just because >> everybody else is around -30dB shouldn't mean Elecraft stop trying to do >> better. Let the portable/backpacking rigs use 12V MOSFETS and switch the >> desktop model K3(s) to higher voltage finals. Yeah, yeah, I know, the K3(s) >> is supposed to be portable capable. How many people take their K3(s) out in >> the sticks...ever...save Field Day? >> >> Just because it has a carry strap doesn't mean it's a portable rig. My >> TS-520 has a beautiful leather strap. It weighs 37 pounds. Anybody know >> where I can rent a mule? >> >> >> On 10/17/2016 3:41 PM, Jim Rogers wrote: >> >>> I have been a loyal Elecrafter for many years, and this seems to be >>> somewhat similar to the VW diesel problem. >>> >>> Elecraft has sold me a radio specifying it to be in compliance with >>> specifications of IMD. Now you are telling me that I must bear the burden >>> of time and expense to bring the device you specified and guaranteed to be >>> in compliance, into compliance. >>> >>> I built mine from a kit, so Elecraft you send me the necessary boards, >>> modules, whatever to bring my K3s into compliance and I will return to you >>> the defective boards,, modules, whatever. Then you can rework the defective >>> boards for the next exchange. I will spend the time and effort of >>> disassembly and re-assembly. >>> >>> Jim, W4ATK >>> >>> K-line, K2 >>> >>> > __ > 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 t...@tf3y.net > -- http://www.tf3y.net __ 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] RJ45 to DE9 cable (E980297) for upgraded K3
Hi folks. I misplaced my RJ45 to DE9 cable for my upgraded K3. After a while I found this (see photo on link below): https://goo.gl/photos/LJwu7gZpEsx6N1K47 This cable looks like it may be the one but I´m not sure. I had two of those one with a female DE9 and the other with a male DE9. However, I have a faint memory of the cable I got with my KIO3B upgrade having been gray whereas these are blue. Can I measure the cables? Where would I be able to locate a diagram for the pinout? Thanks / 73, Yngvi TF3Y -- http://www.tf3y.net __ 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] TX3X K3/KPA500 DXpedition to Chesterfield Islands on the air
Propagation has been pretty awful at Northern latitudes. Never heard over here in TF. 73, Yngvi TF3Y On Tue, Oct 6, 2015 at 6:31 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > K6MM has been in contact with several of the ops at TX3X. They have been > experiencing pretty awful WX, lots of rain, very high winds. Too much wind > to get the 80M and 160M antennas up -- although they have been QRV on 80 in > the last 12 hours. > > I worked them yesterday with 5W on 10M SSB. > > Here's what he posted to the NCDXC reflector yesterday. > > 73, Jim K9YC > > = = = = = > > Thus far I have been able to work these "local" TX3X operators on SSB: > > 40MTom, ND2T > 20MRoss, K6GFJ > 17MSteve, W1SRD > 15MKevin, K6TD > > I volunteered to keep in touch with their families while they're on the > DXpedition. > > My general sense from these "quick chats", is that they are having a > miserable time coping with the high winds, rain, sleeping conditions, and > Mother Nature in general on Chesterfield. Some of this is documented on > the internet, the latest yesterday: > > http://www.dx-world.net/tx3x-chesterfield-island-dxpedition-2015/ > > Unfortunately their website and log search function has been down for > several hours now: http://TX3X.com > Hopefully this is temporary. > > The biggest problem has been installing their antennas, especially for 80M > and 160M because of the high winds. Thus far, they have not been able to > activate those bands. The team is still in good spirits, however, and > determined to overcome these visits from Murphy. They'll be there another > week. Let's wish them good luck. Fingers crossed. > > My advice: If you've already worked them, try to resist the temptation to > rack up a lot of band-modes until the group has had a chance to put as many > ATNO QSOs in the log as possible this week. And keep watching those DX > cluster spots. > > 73, > John, K6MM > > > > On Tue,10/6/2015 11:08 AM, Wes (N7WS) wrote: > >> Rolling along? Twelve ops, seven complete 500W stations and ton of >> antennas and 21K Q's in 6 days. >> >> E6GG with seven ops and four radios made ~ 49k Q's in 12 days. >> >> Just sayin' >> > > __ > 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 t...@tf3y.net > -- http://www.tf3y.net __ 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] OT - RX Active Multicoupler Diagrams/Design
Pardon the Off Topic but I'm looking for a diagram / design for an active HF receive moulticoupler with outstanding dynamic range. Any suggestions? Thanks, Yngvi TF3Y -- http://www.tf3y.net __ 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] OT - RX Active Multicoupler Diagrams/Design
To follow up on my previous OT posting then I have found two designs on the web sofar, quite different constructions: http://www.schmitzhouse.com/Johns_Electronics_24.htm http://www.qsl.net/ko6bb/multicoupler_2.html I currently favor the first design but got some doubts on the dynamic range. 73, Yngvi TF3Y On Sun, Sep 13, 2015 at 2:30 PM, Yngvi (TF3Y) <t...@tf3y.net> wrote: > Pardon the Off Topic but I'm looking for a diagram / design for an active > HF receive moulticoupler with outstanding dynamic range. > > Any suggestions? > > Thanks, > Yngvi TF3Y > > -- > http://www.tf3y.net > -- http://www.tf3y.net __ 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] OT - RX Active Multicoupler Diagrams/Design
Some off-list correspondence with Mel K6KBE and Brian K3KO made me realize that the KO6BB design at the second link posted is superior and I will proceed with building along those lines. Thanks / 73 Yngvi TF3Y On Sun, Sep 13, 2015 at 3:02 PM, Yngvi (TF3Y) <t...@tf3y.net> wrote: > To follow up on my previous OT posting then I have found two designs on > the web sofar, quite different constructions: > http://www.schmitzhouse.com/Johns_Electronics_24.htm > http://www.qsl.net/ko6bb/multicoupler_2.html > > I currently favor the first design but got some doubts on the dynamic > range. > > 73, Yngvi TF3Y > > On Sun, Sep 13, 2015 at 2:30 PM, Yngvi (TF3Y) <t...@tf3y.net> wrote: > >> Pardon the Off Topic but I'm looking for a diagram / design for an active >> HF receive moulticoupler with outstanding dynamic range. >> >> Any suggestions? >> >> Thanks, >> Yngvi TF3Y >> >> -- >> http://www.tf3y.net >> > > > > -- > http://www.tf3y.net > -- http://www.tf3y.net __ 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 feature request - RX Out active while K3 turned off
I wonder if the following is something that is possible to implement via a change in firmware: Allow an antenna to be active on RX Out regardless of whether the K3 is turned on or not? 73, Yngvi TF3Y -- http://www.tf3y.net __ 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] K3S IMD Questions
Thanks Jim. This is COOL. 73, Yngvi TF3Y On Tue, Sep 1, 2015 at 3:13 AM, Jim Brown <j...@audiosystemsgroup.com> wrote: > On Mon,8/31/2015 10:04 AM, Yngvi (TF3Y) wrote: > >> Even though I'm personally most interested in CW I wonder if there is any >> recent two tone SSB tests that's been published? >> > > I've published some SSB bandwidth measurements using pink noise as > excitation. Because pink noise contains all frequencies, the spectra > resembles music and speech, and is dynamic, it excites IMD in a manner > comparable to speech. > > http://k9yc.com/P3_Spectrum_Measurements.pdf > > http://k9yc.com/FTDX5000_Report.pdf > > So far, I've measured only a few rigs using pink noise, but of those I've > measured, I've seen very little difference between them. > > On the air is a very different story -- it's VERY common to see distortion > on SSB signals in the form of both upper and lower sidebands on audio > peaks. Because it is present in both sidebands, I strongly suspect it's > caused by power amps that are over-driven, or poorly tuned, or improperly > biased. We hear it as splatter (sometimes as wide as 10-20 kHz), and see it > on the P3 and horizontal lines corresponding to audio peaks. > > > 73, Jim K9YC > > > __ > 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 t...@tf3y.net > -- http://www.tf3y.net __ 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] K3S IMD Questions
Some time ago I was discussing this with one of the locals who maintained that the K3 had terrible TX IMD. I wonder if there are any newer published TX IMD test results? In any case I guess the K3S has better TX IMD due to the new PA design. 73, Yngvi TF3Y On Mon, Aug 31, 2015 at 3:22 AM, Scott Manthe <scott.man...@gmail.com> wrote: > Again, the Sherwood TX IMD test that is the basis of the eHam thread is > almost 7 years old. That problem was fixed long ago, which is why so many > multi-multi stations and DXpeditions have been using K3s (not K3S's) for > all of these years. There hasn't really been any concern about the K3's TX > IMD for quite sometime, except for the occasional eHam troll. > > 73, > Scott N9AA > > > On 8/30/15 11:09 PM, Bob McGraw - K4TAX wrote: > >> In as much as most multi contest stations use K3 radios and will likely >> move to K3S radios, there wouldn't seem to be any concerns in this regard. >> >> 73 >> Bob, K4TAX >> K3S s/n 10,163 >> >> On 8/30/2015 9:33 PM, Gary wrote: >> >>> Scott, >>> >>> I think the report might be a year old. >>> >>> I don't place much stock in eHam, most articles are Perception ' based >>> and I prefer Rob's testing and reports. >>> >>> Wayne acknowledged the IMD issue way back when Rob pointed it out, it >>> was fixed very quickly. >>> Gary >>> >>> -Original Message- >>> From: "Scott Manthe" <scott.man...@gmail.com> >>> Sent: 31/08/2015 12:26 PM >>> To: "ae...@carolinaheli.com" <ae...@carolinaheli.com>; " >>> Elecraft@mailman.qth.net" <Elecraft@mailman.qth.net> >>> Subject: Re: [Elecraft] K3S IMD Questions >>> >>> Did you happen to notice that the IMD test that KA4WJA is basing his >>> thread on is from 2008? Do you think that Elecraft might have made some >>> improvements to the K3 since then? >>> >>> 73, >>> Scott N9AA >>> >>> >>> > __ > 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 t...@tf3y.net > -- http://www.tf3y.net __ 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] K3S IMD Questions
Thanks Jim. I forgot to mention that I was aware of your survey in terms of CW signal purity. Even though I'm personally most interested in CW I wonder if there is any recent two tone SSB tests that's been published? 73, Yngvi TF3Y On Mon, Aug 31, 2015 at 4:32 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > On Sun,8/30/2015 8:22 PM, Scott Manthe wrote: > >> Again, the Sherwood TX IMD test that is the basis of the eHam thread is >> almost 7 years old. >> > > Study k9yc.com/TXNoise.pdf which is a comparison of ARRL LAb testing of > popular transceivers, including the K3. Occupied bandwidth of a CW signal > is an excellent test of IMD, because CW is 100% modulation of a carrier by > a square wave, whose infinite harmonics excite IMD. The K3 is the cleanest > of all rigs tested, and it isn't close. > > IMD in a K3 is highest at its highest power setting, and is also highest > with low DC power supply voltage. Unlike many other popular rigs, IMD in > the K3 gets even better at reduced output power. Most of the better power > amps require drive power in the range of 30-50 watts, and having a clean > signal matters most when you're loud in the other guy's RX. :) > > 73, Jim K9YC > > __ > 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 t...@tf3y.net > -- http://www.tf3y.net __ 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] KSYN3A + KSYN3
As long as you buy a new KRX3-A I guess it would come with a KSYN3A. 73, Yngvi TF3Y On Mon, Jun 22, 2015 at 12:59 AM, Russ mundschen...@msn.com wrote: All: For those of you who don't read instructions like me - remember to download and install the latest K3 utility before uploading the new 5.14 firmware (or above) - otherwise you may get an FPF load error. Question - if I decide to install a KRX3 later, can I reuse the old KSYN3 for it - can the old KSYN3 and the new KSYN3A coexist in the same box? OK - call me cheap / thrifty / cost effective or just stupid if you want :} Thanks, Russ KD4JO __ 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 t...@tf3y.net -- http://www.tf3y.net __ 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] Looking for a KPA500 Schematic
I believe I saw a pdf diagram for the KPA500 on the elecraft yahoo group in the Files area a while back. 73, Yngvi TF3Y On Sun, Mar 29, 2015 at 2:25 AM, hsherriff hsherr...@reagan.com wrote: There is a set of 17 pages pdf that can be downloaded from www.mods.dk No idea how old it is ... Harlan NC3C Sent from my Verizon Wireless 4G LTE smartphone div Original message /divdivFrom: Gary Gregory vk1zzg...@gmail.com /divdivDate:03/28/2015 10:06 PM (GMT-05:00) /divdivTo: Johnny Siu vr2...@yahoo.com.hk /divdivCc: Elecraft List elecraft@mailman.qth.net /divdivSubject: Re: [Elecraft] Looking for a KPA500 Schematic /divdiv /divHas anybody asked Elecraft support for a schematic? Cannot imagine they would say no. Just sayin... 73 Gary Vk1ZZ K3, KPA500-FT, KAT500-FT On 29/03/2015 11:03 AM, Johnny Siu vr2...@yahoo.com.hk wrote: Hello Scott, I suggest we should also put in a suggestion Contact supp...@elecraft.com Shipping of the entire amplifier could be expensive. The merit of elecraft products are their module design which is very good for overseas user. I simply ship back the defective module instead of the whole machine. Perhaps, elecraft support could give a schematic to the interested kpa500 owners. 73 Johnny VR2XMC 寄件人︰ Scott Manthe scott.man...@gmail.com 收件人︰ elecraft@mailman.qth.net 傳送日期︰ 2015年03月29日 (週日) 8:37 AM 主題︰ Re: [Elecraft] Looking for a KPA500 Schematic Apparently there is some misunderstanding regarding my comment (Or people are responding without reading the entire message closely...). I was NOT responding to the original poster. I was responding to the second commenter, who said that he needed a schematic because his NEW KPA500 had failed. My point was that rather than risk further damaging a NEW, still under warranty KPA500, why not simply let Elecraft fix it. I'm not sure why it's unbelievable that I'd send my NEW amp to Elecraft for repair, but to each his or her own. I wasn't suggesting that no one needs a schematic, just that it probably wasn't the most necessary in that particular situation, where a piece of gear was NEW and under warranty. A supplied schematic would be nice, especially given that the skill level of the average Elecrafter might be somewhat higher than the average ham. 73, Scott, N9AA On 3/27/15 10:53 PM, Wes (N7WS) wrote: Unbelievable. On 3/27/2015 10:40 AM, Scott Manthe wrote: Why would you want a schematic? If it's new, Elecraft will fix it free. I'm all for being able to troubleshoot my gear, but if I buy something new and it fails within the warranty period, I'm not going to waste my time trying to fix it, the manufacturer will. 73, Scott, N9AA __ 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 vk1zzg...@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 to hsherr...@reagan.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 t...@tf3y.net -- http://www.tf3y.net -- http://www.tf3y.net __ 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] FW: Sherwood Engineering Tests
Thanks for the explanation Wayne. 73, Yngvi TF3Y On Tue, Feb 24, 2015 at 9:57 PM, Wayne Burdick n...@elecraft.com wrote: Just to complete the point about this: The K3 tested probably didn't have its S-meter calibration (RX gain cal) completed before we sent it to Rob, an oversight on our part. This procedure is fully automated by the K3 Utility program, and definitely would have corrected the sensitivity threshold issue Rob observed. 73, Wayne N6KR On Feb 24, 2015, at 1:54 PM, Wayne Burdick n...@elecraft.com wrote: Some on this list are still mistaking this column of Sherwood's chart as *receiver sensitivity*. I believe it is a measurement of AGC threshold. The K3's receiver sensitivity (MDS) is excellent by any measure; see the noise floor column. (Side-note: It's interesting that the preamp-off sensitivity of the tested K3 was -136 dBm, while that of the Flex 6700 was -118 dBm -- an 18-dB difference. One would have to leave the preamp ON much more often with the '6700. As Sherwood noted, this maximizes the '6700's dynamic range, but you'd also be hitting the A/D that much harder.) 73, Wayne N6KR On Feb 24, 2015, at 12:24 PM, Chester Alderman alderm...@windstream.net wrote: _ From: Chester Alderman [mailto:alderm...@windstream.net] Sent: Tuesday, February 24, 2015 1:59 PM To: 'Yngvi (TF3Y)' Cc: 'Elecraft Reflector' Subject: RE: [Elecraft] Sherwood Engineering Tests Hi Yvgvi, I wonder, given atmospheric noise levels, if that is really going to be noticed by the operator. I seriously doubt It would be noticed in a contest? 73, Tom - W4BQF -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Yngvi (TF3Y) Sent: Tuesday, February 24, 2015 1:26 PM To: elecraft@mailman.qth.net mailto:elecraft@mailman.qth.net Subject: Re: [Elecraft] Sherwood Engineering Tests These are interesting stats. One thing I noticed was the apparent loss in sensitivity as measured by Sherwood. This is probably not a big issue for most these days with the ever increasing noise levels but for the few in silent locations, incl. some DXpeditions this might be an issue. Any comments on this? 73, Yngvi TF3Y http://www.tf3y.net __ 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 n...@elecraft.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 n...@elecraft.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 t...@tf3y.net -- http://www.tf3y.net __ 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] KPA500 efficiency
Hi Ignacy. Many thanks for the response. The reason for my query was that I was puzzled by my calculated efficiency numbers - I felt they were high. This also led me to wonder about the operating class of the amplifier, i.e. whether it was operating in linear mode on CW or not. I have confirmed the accuracy of the LP-100A which conforms broadly with the built in meter of the KPA500. The LP-100A was factory built so I'd get a NIST calibrated unit. It's an impressive instrument. I have not confirmed the accuracy of the KPA500 voltage and current measurements. I don't think there is anything to adjust in order to calibrate these. I did get a response from Wayne N6KR on another email list, where I posted my message as well. I'm sure he doesn't mind me quoting him: As with all broadband power amplifiers, the efficiency of the KPA500 varies somewhat from band to band due to variations in matching circuit efficiency and transformer performance. That's why typical efficiency is specified. However, I got no comment on the operating class of the amplifier on CW or whether it depends on what mode you are operating the K3. Anyone? 73, Yngvi TF3Y http://www.tf3y.net On Tue, Jul 23, 2013 at 6:45 PM, Ignacy n...@arrl.net wrote: 78% efficiency seems high. But your calculations assume that all the meters are accurate. KPA500 is rated at 500W in linear mode and is supposed to have an efficiency around 50% at this level. At a higher drive the amp will be less linear but at a higher efficiency. At low power the efficiency increases linearly with output power. If about 50% with 500W then about 62% with 620W. A data sheet for Microsemi 1 KW module shows efficiency curves in Fig 19 at www.freescale.com/files/rf_if/doc/data_sheet/MRFE6VP61K25H.pdf. About 65% efficiency at 700W with IMD3-40db. Reaching 80% at 1.4 KW and IMD3-28db. The dissipation is about 370W at 700W level and 350 at the 1.4 KW level. These numbers do not include losses in transformers and filters. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-efficiency-tp7577015p7577042.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 __ 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
Re: [Elecraft] KPA500 efficiency
Thanks for the info Lyle. Interesting! I must study the KPA500 design. I find it a bit embarrassing having assembled the KPA500 without having more fundamental insight into its design. 73, Yngvi TF3Y On Tue, Jul 23, 2013 at 9:26 PM, Lyle Johnson kk7p4...@gmail.com wrote: The KPA500 has no knowledge of mode. It is a linear amplifier, only and always. 73, Lyle KK7P However, I got no comment on the operating class of the amplifier on CW or whether it depends on what mode you are operating the K3. Anyone? __ 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
[Elecraft] KPA500 efficiency
Hi folks. I'm wondering about the efficiency of the KPA500. Mine, which I assembled a few days ago seems to exchibit 76-78% efficiency on CW. Admittedly I havent tested it on SSB. The HV stands at 57.6V under load with current at 14A. Hence 806W input. Measured output using my LP-100A at 630W. Drive for this 29W on 12m. What class is the amplifier operating in on CW? Does the class depend on mode? I'm using the KPAK3AUX cable. The operating temperature seems to remain close to 50C. 73, Yngvi TF3Y http://www.tf3y.net __ 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
Re: [Elecraft] cobweb antenna
Hi folks. I used a CobWebb by G3TPW for a few years. It's a nice and compact antenna and it withstood the Iceland climate very well. I had it on a 16 ft. 2.5 dia aluminium tube at the top of my house. Total height above ground 32 ft. The performance was always better than a full size 1/4 wave ground mounted vertical and noise floor on RX considerably lower. The CobWebb has a fairly narrow bandwith as it is a dipole bent in a square. The dipole is T matched with a current balun at the feedpoint. It's almost omni directional. I currently have a 2 el. SteppIR but I really liked the CobWebb. It's quite an efficient antenna. 73, Yngvi TF3Y http://www.tf3y.net On Fri, May 31, 2013 at 10:54 AM, rck...@comcast.net wrote: Hello Bill, I have no intent to denigrate the design and functionality of the Cobweb style antenna but. Several years ago I was inclined to acquire the G3TPW commercial version of the CobWebb antenna, I found the website ( www.g3tpw.co.u ) and sent an email asking how to order, method of payment shipping charges, etc. Got no response..I thought maybe there was some problem with the 1st email attempt so I sent another.still no response. So I sent an inquiry via regular mail, including a self addressed (with postage) return envelope..no reply whatsoever... So I can't comment on how well the G3TPW version functions..but in consideration of my above described experience, maybe you should limit your effort to a homebrew version. Also, later I had good results with the homebrew version of the Buddipole, built from free instructions on W3FF's homepage ( https://sites.google.com/site/w3ffhomepage/ ). But back then I was doing more portable ops and since the commercial version is more sturdy I decided to get one..saw one being offered on ebay so I bid and won the auction. Eventually I lost one small bit and needed a replacement part so I contacted W3FF and got very fast responseeven though I hadn't purchased direct from them. So I've decided customer service is just as important as functionality when deciding which products to acquire. Just my opinion... Rich K2CPE K2 #1102 - Original Message - From: Bill Blomgren billb...@nc.rr.com To: Elecraft@mailman.qth.net Sent: Thursday, May 30, 2013 10:27:22 PM Subject: [Elecraft] cobweb antenna I'm still in the pre-purchase stage.. but I'm sort of thinking that the K3 is where I'm going to end up.. Possibly with the preamp...and then there is the big problem: what to make it to the air with. The idea of starting off with the buddipole system is out there - and very possible... I've also been reading up on the plusses and minuses of many of the alternatives that may be possible in an apartment life... One is the magnetic loop - which is a tad pricey with the vac. variable -- lots of copper, and the need to tune the thing every time you change frequency - and not just antenna tuner stuff - as in changing the cap on the antenna itself. It is a very high q (and thus voltage and current) critter...Rube Golberg figured out how to do that.. motors with long screw drives into a sealed box with the cap inside..with very high voltages there... and thus requiring altitude for safety.. I came across a nifty square thing called a cobweb, which is more or less semi-flat over 4-5 bands... is very light..and can be made of pvc pipe or possibly fiber glass because it just has 5 wires in a big square.. One antenna to cover 20 17 15, 12 and 10 meters sounds interesting.. One of the designs even works on 6, but has higher losses... (That may be the baluns they use for a 4-1 impedance match and to go unbalanced... Has anyone tried one of these critters, and if so, is the Elecraft happy with it? __ 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 __ 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 __ 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
