RE: [Elecraft] Re: Does the K2 have a built in SWR meter ?
The Basic K2 get´s an SWR Meter as soon as the KAT2 QRP Tuner is built in. You don´t need any 100W Version 72/3 de Peter, DL2FI -Original Message- From: [EMAIL PROTECTED] [mailto:elecraft- [EMAIL PROTECTED] On Behalf Of Gregg R. Lengling Sent: Tuesday, April 29, 2008 8:38 PM To: Ffive VHN; elecraft@mailman.qth.net Subject: Re: [Elecraft] Re: Does the K2 have a built in SWR meter ? The basic K2 does not have a bridge on the output...the KPA100 amplifier and the KAT100 tuner both have bridges. The 100 has a SWR display from the bridge, the KPA100 is used basically as a power meter circuit. Gregg R. Lengling, W9DHI Administrator http://www.milwaukeehdtv.org http://forums.ham-radio.ch/ - Original Message - From: Ffive VHN [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Tuesday, April 29, 2008 1:30 PM Subject: [Elecraft] Re: Does the K2 have a built in SWR meter ? Hi again, Thats interesting.. Some say 'yes' and some say 'no'. It looks like the K2 (original qrp) version does not , but the K2/100 does. Do you agree ? thanks F5VHN f5vhn(at)yahoo.com (at)=@ --- Ffive VHN f5vhnyahoo.com wrote: Hello, A simple question for you, Does the K2 have a built in SWR meter ? I am going to build an ATU and I want to know if I'll need to include an SWR meter. If the K2 already has one , I will not need to. Please reply directly to me , thanks. Rob F5VHN f5vhn(at)yahoo.com (at)=@ __ Sent from Yahoo! Mail. A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html __ Sent from Yahoo! Mail. A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.6/1403 - Release Date: 4/29/2008 7:26 AM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] A miracle or am I getting old??? I need help!
Good morning friends An elder friend om mine got his new K2 ready a couple of days ago, it worked fantastic. After some playing with the menues a miracle appeared: The receiver does not receive, in CW mode the mode indicator changes from c to F every 2-3 seconds. NO, it´s not the r for rtty plus the bar for CW reverse, it´s a complete F I am pretty sure I never have seen before this flashing Fm I traced the manual to find everything with the word flash in it - no success. The K2 is a CW only machine, extra Modules are AF Filter and RS232 Any Idea?? 73 de Peter, DL2FI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] A miracle or am I getting old??? Problem solved (at least partially)
Good morning friends The elder friend did some more playing with the menue and he found the fault: D19 was set to Y(es) After switching to n, the Receieiver started receiving signals again and the flashing F disappeared. So far so good. I just set my own K2 to D19 Y. No flashing F :-((( However, his K2 is running, he is happy 73 de Peter, DL2FI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] K2 weird problem
I just had a very similar problem at a customers K2: Without SSB board but jumpers and C167 set, all is ok. With build in SSB board ALC sometimes worked, sometimes not. The failure was caused by a reversed Diode D2. Even if your Diode is not reversed, it may have a thermal failure. Also check transistor Q1 73 de Peter, DL2FI -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Kevin Schmidt Gesendet: Dienstag, 28. November 2006 19:10 An: elecraft@mailman.qth.net Betreff: RE: [Elecraft] K2 weird problem Others on the list know infinitely more than I do about how the K2-KSB2 work, but from the symptoms, I would guess that the KSB2 is loading down the VRFDET line so that the K2 thinks it isn't generating enough power. It then tries to up the power, gives the high current warning, and drops back to 10 watts. This would suggest checking the components around Q1 on the KSB2. 73 Kevin w9cf Hello agn fellow Elecrafters, I still have a problem with my K2, upon cold startup. power cont. set to 5w. CW mode. when 1st x-mit . bargraph shows almost no ind. but hi curent alarm, power out is 10+ watts( 40m) es after a minite or 2 all is backto normal with bar graph showing 5w es power out is 5w es no alarm. i followed Keith Darwins suggestion es made some rework eliminators. I narrowed the problem to when the ssb brd is plugged in. with ssb brd out, all is fine. I went thru a rebuild of the ssb board es all parts are in proper places es no cold solder joint or bridges. Problem is with ssb brd. could my problem be a faulty (intermittent) IC ??? Any sugestions appreciated. tnx, Gregg WB8LZG =- Kevin Schmidt, [EMAIL PROTECTED], http://fermi.la.asu.edu/w9cf Department of Physics Arizona State University, Tempe, AZ 85287-1504 (480) 965-8240 Fax: (480) 965-7954 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] Re: Italy Customs Duties
Peppino, As a first, you're assuming the invoice total amount, including shipping and handling (105 $): no VAT is due on this part, normally. That´s definitively wrong for whole EC. VAT has to be paid on Shipping cost as well. 73 de Peter, DL2FI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] UK import duty
Larry, thats an old number, they changed early this year. The actual number is: 8525 2080 900 for atransmitter with built in receiver if is not for telefone or aeronautical use The number for accessories is: 8529 9040 000 ( parts or acceries used for a transmitter with built in receiver, not for telefone or aeronautical use) 73 de Peter, DL2FI www.qrpproject.de -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Larry Phipps Gesendet: Mittwoch, 14. Juni 2006 16:56 An: Stewart Baker Cc: Elecraft Reflector Betreff: Re: [Elecraft] UK import duty Technically, I think the code is 8529 9040 000 That is what I use when sending my kits to EU. Larry N8LP ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] UK import duty
The US Postal Service Customs Declaration and Dispatch Note has clearly typed the HS tariff number 8529 9040 00, however the description was for:- Transmitter Equipment with Built-in Receiver Except Mobile Phones and Aircraft Equipment. This contents description on the Customs Declaration was wrong, not matching the Commodity Code, and should have referred to Parts for use with Radio. This is something that Elecraft should rectify immediately. Correct description but wrong number, Steward. That must have been in the days when they changed the number. In those days I checked the new number for elecraft, since that day the use the new number. The second problem: USPS does not insure 500 USD, so if you order a complete K2, elecraft divide this into 2 shipments now. You have to pay twice the shipping cost and 17,5% VAT on both, price of the K2 plus shipment cost. QRPproject is receiving big elecraft packages every second week, believe me, I know how expensive this shipment and VAT stuff is. 73 de Peter, DL2FI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] AW: [QRP-L] Feeding the Halfwave Ant
Steve, IMO you will find more center feed halfewave antennas then endfeed halwaves because at Home it is normaly not so easy to have the ATU directly to the antenna without feeder line. Endfeed halfwaves with feeder line result in high impedance coupling which is not so easy to handle. If we talk about portable Antennas, here in Germany the endfeed halfwave, coupled directly to the ATU has become one of the most used portable wire antennas ever. It´s efficiency is great even if it ends very near to ground with it´s feeded side. We use what we call a Fuchs Kreis to tune it. (this type of Antenna was described By Mr. Arwed Fuchs, an Austrian Radio Amateur in 1928. The Fuchs Kreis actually is a halve wave parallel tuned Circuit, the antenna is directly coupled to the High impedans top of it. To make it multiband, we use 2 Torroids with tapped coils, a switcheable coupling winding and a variable capacitor (exactly the same as it is used in the ZM) BTW, the Z-Match itself is also a tuned parallel circuit. The difference: it uses a different coupling method and it tunes to frequencies the same time. ___ / | / | / = --- / / | --- / / | --- If you are interested, you will find the complete manual of our Multband Fuchs here: http://www.qrpproject.de/UK/fuchs_ant_.htm It is great for backpacking because it is very small, it needs no feeder, it needs no counterpoise and it gives a ton of preselection to your receiver as well. 73 de Peter, DL2FI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] Errata! Check for errata!
No need to do, Bart, They have forgotten to put the errata into the kit. This happened first time and I got an alarm message immediate from Elecraft to add it to my stock kits. Normaly the erratas are in the kit. 73 de Peter, DL2FI www.qrpproject.de -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von pa3gyu Gesendet: Donnerstag, 8. Juni 2006 23:28 An: elecraft@mailman.qth.net Betreff: [Elecraft] Errata! Check for errata! Yesterday I received an XG1 Receiver Test Oscillator. One resistor has the wrong value: R8 (1.27 k) was actually delivered as 1.24 k. Claiming this at Elecraft's much praised 'help-I'm-missing-a-part' department, Scott AH6KL replied promptly and to the point: Yes you do have the correct resistor for XG-1 R8 as it needs to be 1.24 K ohms or 1240 ohms. Inadvertently Elecraft did not include an errata with your kit describing this substitution. Please go ahead and install the 1240 ohm resistor at R8 with confidence. Apologies for the oversight. Only after I received Scott's email, I checked at Elecraft's website and noticed there is an errata for this kit. All it says is that R8 has a different value and should be 1.24 k Darn, now why didn't I think of checking the website for errata first? Well, actually because I didn't think there could be an errata-sheet for a four page manual: I figured it would be small enough to be up to date. Apparently not. I'll check the website again for the other kits I've received just to make sure. There is always a chance new errata's are published. Lesson learned, ymmv. Bart de PA3GYU ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] KX1 Crystal Filter Center Frequency a Little Low
Ladder filters vary both their input/output impedance and their midfrequency when you vary the bandwith. High level rigs like the K2 therefore adjust the BFO regarding bandwith (Cal Filter), simpler rigs like the KX1 want the OP to do this by brain :-) The impedance change is why you have more or less attenuation, while varying the bandwith. 72/3 de Peter, DL2FI www.qrpproject.de -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von David Toepfer Gesendet: Mittwoch, 26. April 2006 19:11 An: Roger Marrotte; Elecraft@mailman.qth.net Betreff: Re: [Elecraft] KX1 Crystal Filter Center Frequency a Little Low On the low end of the filter it drops down from around 600Hz over most of the range to around 500Hz. I am sure others can detail why. David, K3ZTUE . ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] Butane torch for stripping/tinning magent wire
I'm no metallurgist, but I'd do some testing to make sure that temp doesn't make the copper weird and brittle. Seems to me that I've had magnet wire go brittle in the flame of a butane lighter. Wiggle around a stripped piece and make sure it doesn't snap off easily .. 73 de w1rt/john John, I have worked for long time in an non iron metall laboratory. If copper is heated to glowing temperature, it will change it´s modification. What remains is some type of copper which will break later or earlier. Using a butane or propan torch you there is only a very small chance not to overheat the copper wire. In my QRPproject manuals, even in my translation of the Elecraft manuals, I warn to use this methode of burning away the enamel. 73 de Peter, DL2FI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] Elecraft K2 Microphones?
Fred, After lots of testing QRPproject is selling the Kenwood MC 43 as best choice together with the K2. It generates an excellent SSB signal, it´s size meets the K2 look and it can be 1:1 connected at the K2 Microphon port. 72/3 de Peter, DL2FI www.qrpproject.de ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: AW: [Elecraft] Elecraft K2 Microphones?
Keith, Ist late in teh evening in Germany and I dont have the papers here at home, But you find the MC43 in the ssb Option manual. If you use it as it is, the jumpers on the jumperbank are stright forward, you may use the 2pin computer jumpers for the pins directly. The up and down keys of the microfon no can be used to switch VFO A/B. Nut as I said, this is all described in the elecraft SSB manual 72 de Peter, DL2FI www.qrpproject.de -Ursprüngliche Nachricht- Von: Keith Hamilton [mailto:[EMAIL PROTECTED] Gesendet: Mittwoch, 12. April 2006 19:48 An: Peter Zenker Cc: elecraft@mailman.qth.net Betreff: Re: AW: [Elecraft] Elecraft K2 Microphones? What are the P1 connections for the MC-43S microphone? Keith Hamilton, W8GX Peter Zenker wrote: Fred, After lots of testing QRPproject is selling the Kenwood MC 43 as best choice together with the K2. It generates an excellent SSB signal, it´s size meets the K2 look and it can be 1:1 connected at the K2 Microphon port. 72/3 de Peter, DL2FI www.qrpproject.de ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com __ NOD32 1.1485 (20060412) Information __ This message was checked by NOD32 antivirus system. http://www.eset.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: AW: [Elecraft] Elecraft K2 Microphones?
Thats correct, David. We should ask Eric if it´s possible to provide us with an elecraft label to glue it on the MC43 :-) Lots of people would like it. It´s the same with the famous HexKey: I like it because it´s execellent, actually I changed my Schurr Professionals against it, but I know a couple of people who bought the HexKey because it´s Elecraft label allthough they did their last CW QSO during the lis examination. 72/3 de Peter, DL2FI www.qrpproject.de -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von David Pratt Gesendet: Mittwoch, 12. April 2006 19:10 An: Peter Zenker Cc: elecraft@mailman.qth.net Betreff: Re: AW: [Elecraft] Elecraft K2 Microphones? Peter Zenker writes After lots of testing QRPproject is selling the Kenwood MC 43 as best choice together with the K2. It generates an excellent SSB signal, it´s size meets the K2 look and it can be 1:1 connected at the K2 Microphon port. I agree with you, Peter. I have both the Elecraft MH2 and a Kenwood MC43. On-the-air reports tell me that the MC43 is to be preferred. Also, it has a more flexible curly cable. The only thing against the MC43 is that it does not have an Elecraft label on the back, but I can live with that. 73 de David G4DMP ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] Re: Metamorphosis
OK, Ron, I'll work on it. Meanwhile, I don't know of anyone completely disassembling a fully-built Elecraft radio and putting it back together. In theory this means twice the fun you had building it the first time ;) 73, Wayne N6KR Not complete and it was not his fun, but mine and mine was more then twice: One of the K2 I had to support / repair was probably very near to your theory. I stopped counting / reporting the failures I found at number 26 (in ONE K2!!). Reversed Diodes, Caps, most of the torroids to desolder and solder new ;-)) 72/3 de Peter, DL2FI www.qrpproject.de ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
AW: [Elecraft] KXB3080 Manual - minor mistake but important fornewbies?
Because I am always free in my manual translations, the German manual of KXB3080 says (retranslated) Recommended is a small solder tip in pencil form No metrics nor inches :-) Peter -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Ron D'Eau Claire Gesendet: Dienstag, 4. April 2006 06:58 An: 'Martin Gillen'; 'elecraft' Betreff: RE: [Elecraft] KXB3080 Manual - minor mistake but important fornewbies? Martin wrote: I know it's minor but 0.05 is more like 1.3mm than 0.13mm... - Thanks Martin!! All the field testers, Wayne, Gary and I all missed it! It's doubly embarrassing for me because I live in metric. Here in the USA much of the scientific/technical stuff is all in metric and I normally convert back to English units for something like this. Shoot, I even cook in Metric. All my recepies are in grams and milliliters. I peeked and see that we had it right in the KX1 manual too. Ron (fumble-fingers) AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] XG1 Results with K1 s/n 1018
2) Should I stop trying to figure out why the speaker volume is so and low and just use headphones? When I touch pin 1 of mixer U2, I get a loud blast from the speaker, so I'm convinced the audio chain is fine. I'm just not sure if the RF level into it is high enough. I have the K1-4 filter board and am sure I've peaked it for best results. Mark, Did you ever try another headphone? It must have the correct impedance and there are diffences of 40 dB between different headphones. 72/3 de Peter, DL2FI www.qrpproject.de ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: RE: [Elecraft] T1 Antenna Considerations
As usualy, you did say it better then i can with my restricted english Ron :-) Have seen your mail after I have written my answer but I thing doubling the knowledge makes it stronger :-) Peter www.qrpproject.de -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron D'Eau Claire Sent: Thursday, January 05, 2006 8:19 PM To: elecraft@mailman.qth.net Subject: RE: RE: [Elecraft] T1 Antenna Considerations Martin wrote: ...another antenna I have used is a 66ft length of wire at 15feet, fed in the centre with 300 ohm twinlead. In this case, the driven half of the wire is still 33ft long - but I get really low SWR om 20m and have worked DX with it, So why does that work? Is the feedline doing something to help me out here? Or is a dipole just a completely different scenario altogether?.. -- You are describing a classic doublet antenna, Martin (a dipole is, by definition, exactly 1/2 wave long and may be fed anywhere: center, off-center or at the end. The dipole or two poles refer to the two electrostatic poles set up at the ends of a radiator when it is exactly 1/2 wavelength long). In your doublet both sides radiate, as you observed. Feedline losses are relatively low because it is of a relatively high impedance (compared to common coaxial lines), which reduces the SWR the feeders may experience under extreme conditions. For highest efficiency, an impedance in the 400-600 ohm range is often used. Another disadvantage of twin-lead is that its electrical characteristics may change significantly with moisture, snow and ice. True open wire with virtually all air dielectric is much more stable in that regard. In this case the feedline acts as an impedance transformer. In another post I explained how the famous Zeppelin antenna behaves with a 1/4 wave feed line transforming the very high impedance at the end of the 1/2 wave wire to a low impedance at the rig. The same thing happens here, although exactly what the impedances being 'seen' by the rig are change dramatically from band to band. Most hams simply add or, if possible prune, some feeder to find a length their matching network (antenna tuner) can handle on all the bands they want to use. As the antenna is made shorter than 1/2 wavelength, the impedance at the center drops very quickly. However, if the missing length is made up in the length of the feed line (e.g. a 33 foot radiator and a 33 foot feed line will be very close to 1/2 wave long on 80 meters) the effect at the transmitter end will be very small. However, since radiation from the feedline of a center fed doublet is minimal if balanced feed is used, the field strength of such an antenna drops as the radiator part becomes shorter and shorter. It's not too bad as long as the radiator is at least 1/4 wavelength long. If I recall correctly, such an antenna is only about 1 dB (1/6 of a typical S unit) lower than a half wave radiator. So a 66 foot long doublet will do a very good job down as low as 3.5 MHz, especially if the feed line is at least 33 feet long. The other issue is height above ground. A horizontal antenna's pattern is controlled a great deal by the height above ground in wavelengths. A horizontal antenna about 1/2 wave above ground is FB for DX with lobes at fairly low angles for DX that are as much as 6 dB - a whole S-unit - stronger than you'd get from, say, a good vertical, thanks to the reflection from the ground helping the signal. As the antenna gets closer to the ground the maximum radiation lobe moves more and more vertically until, at about 0.2 wavelengths above the ground the lobe points straight up. That's not much good for DX but it's great for short skip contacts out to about 1000 miles as the radiation straight up is scattered and reflected off of the ionosphere. Hams setting up antennas specifically for working other stations out to about 1000 miles often purposely put them fairly close to the ground for just that reason. Below 0.2 wavelengths, the main lobe continues to point straight up but grows weaker as the ground losses increase. So your 15 foot high 66 foot long antenna was a FB 40 meter short-skip antenna and it probably got out quite well for skip out to about 1000 miles on 80. On 20 you start working more DX with 15 and 10 meters being excellent DX bands for it. On those bands it is high enough for good low-angle lobes and at that length the pattern breaks up into multiple lobes that show significant gain over a half-wave radiator. When speaking of lobes, keep in mind that the radiation from an antenna is never zero in any direction. There's always some radiation in every direction. The lobes only indicate that some directions are favored more than others. And, as the QRP and QRPpers constantly prove, miniscule signals
RE: RE: [Elecraft] T1 Antenna Considerations
Hi Martin, You are using twinlead! A twinlead always acts as a transformer we call it lecher system, my dictonary believes you call it the same :-) If you have a given impedance at one end, the impedence at the other end is depending on frequency and length of the Lecher wires. E.G. If the lenght of the lecher wires is exactly an electrically quarter of the wavelength, an open ended twinlead will show a short= Zero Ohms at the other end. Draw the current curve above the wire and you will understand it easier: A halfwave has zero current at the ends (0 current = high voltage = high impedance) and high current in the middle. At any point along the line you will have another impedance, thats the result of the transformed impedance at the feed point. By the way, thats the reason why lots of twin lead frieds use to have a 2-3m extra piece of twinlead in their bag if they are portable. If by chance the impedance on one band is transformed to a value the ATU cannot handle, they make the twinlead a little bit longer with this reserve piece and - bingo- the tuner now can handle the impedance. 72 de Peter, DL2FI www.qrpproject.de -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Martin Gillen Sent: Thursday, January 05, 2006 7:43 PM To: elecraft@mailman.qth.net Subject: Re: RE: [Elecraft] T1 Antenna Considerations Hi, Peter. Please excuse my ignorance I'm fairly new to amateur radio ;) But I have a question: The only reason that the use the nearby bushes construct now can be tuned by the T1 is that the impedance goes low because a part of the antenna is lying on the floor now, giving high capacitance against ground which allways lowers the impedance. Yes, I understand that; any radiation from the counterpoise is effectively lost into the ground. However another antenna I have used is a 66ft length of wire at 15feet, fed in the centre with 300 ohm twinlead. In this case, the driven half of the wire is still 33ft long - but I get really low SWR om 20m and have worked DX with it, So why does that work? Is the feedline doing something to help me out here? Or is a dipole just a completely different scenario altogether? Thanks, Martin. ___ Yahoo! Exclusive Xmas Game, help Santa with his celebrity party - http://santas-christmas-party.yahoo.net/ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] T1 Antenna Considerations
Martin, As previously stated a halfwave end fed wire represents a very high impedance which is outside of the matching range of the T1. I agree, the impedance hight depends on the capacitive load of the wire ends against ground. I have found that a halfwave long wire works as long as it is fed against a raised counterpoise, ie. a wire lying over some nearby bushes. In this case it works because the two wires are really an off center fed dipole with the radio in the middle. But if you add any wire length to a Lambda/2 behind it´s feedpoint, the impedance will still be high, you still are feeding at Lambda/2. On a given length of long wire, the impedance is high every Lambda/2 length and low every Lambda/4 length. The only reason that the use the nearby bushes construct now can be tuned by the T1 is that the impedance goes low because a part of the antenna is lying on the floor now, giving high capacitance against ground which allways lowers the impedance. The worse thing is, that this part of the antenna now also is radiating into ground ;-( To make a t1 work with a halfwave, you may use a 15:1 / 9:1 Autotransformer directly in the feedpoint. A much better way has been published 1928 by the Austrian Radio Amateur FUCHS. He added another half wave to the antenna, but this halve wave is not a wire but formed by a parallel circuit. halfe wave wire_coil | / | / cap= / _ | / / | / /__ 50 Ohm But I agree, this is not a solution for the T1 In Germany the FUCHS ATU is very common in the QRP Area since the German QRP Club published an all band version. 72 de Peter, DL2Fi ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KW Amp Prices
Vic, I love your arguments: Suppose you have a couple of hundred watts and you are trying to work DX on 160 meters. There will be lots of times that you call a station and he simply doesn't hear you. If you are just below the noise level at his location, a couple of DB may put you just over, and you will be heard. You can work a lot of DX with low power, but that doesn't mean that there's no value in higher power. But believe me, you even will have a much better s/n if you use your mobile phone and you can have lots of contacts all over the world with it and it´s cheaper!! And there is less QRM too and you will have no problems with tornados destroying your antennas. ;-) 73 de Peter, DL2FI ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] RF Noise canceller ?
Hello Marinos, There have been several schematics using such technics over the last 20 years. Most of them use a seperate short antenna, feeding the signal pase shifted into a combiner which combines the main Antenna Signal with the phases shifted extra antenna signal. This construction can reduce a lot of man made noise. I remember there was a commercial available stand alone unit sold by a small english company. I myself built such a unit to help reducing my noise problem especialy at 160m (I live in the middle of Berlin, Noise level in the evening is S7) But I forgot the unit during the time because I do not have an 160m Antenna any longer. 73 de Peter, DL2FI -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marinos Markomanolakis, M.D. Sent: Sunday, April 03, 2005 6:45 AM To: elecraft@mailman.qth.net Subject: [Elecraft] RF Noise canceller ? Just a question for the technically inclined group members: How feasible or worth the effort, would be the addition of an option to the K2 which would sample RF noise from a ferquency close to the used band,(tunable?) which is devoid of signals, phase invert and reinject the noise to an IF stage or even the antenna input in order to cancel our the white or pulse noise components, preserving the desired signal ? Why similar circuits are not preferred in HF receiver designs instead of DSP filters ? Similar circuits are commonly used in biomedical devices (called linear averagers if I am not mistaken) and are very effective in isolating electric signals from a particular organ eg Heart in EKG or brain area of interest in EEG, filtering out the irrelevant noise from the muscle cells... Just some food for thought. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] RF Noise canceller ?
I think no. White noise by definition is no statistic, therefore IMO it cannot be eliminated because at no time it has a defined phase angle. 73 de Peter -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marinos Markomanolakis, M.D. Sent: Sunday, April 03, 2005 3:26 PM To: [EMAIL PROTECTED] Cc: elecraft@mailman.qth.net Subject: RE: [Elecraft] RF Noise canceller ? Hi Peter, Would this type of noise canceler not work on white noise also ? 73, Marinos, ki4gin From: Peter Zenker [EMAIL PROTECTED] To: 'Marinos Markomanolakis, M.D.' [EMAIL PROTECTED],elecraft@mailman.qth.net Subject: RE: [Elecraft] RF Noise canceller ? Date: Sun, 3 Apr 2005 13:03:51 +0200 Hello Marinos, There have been several schematics using such technics over the last 20 years. Most of them use a seperate short antenna, feeding the signal pase shifted into a combiner which combines the main Antenna Signal with the phases shifted extra antenna signal. This construction can reduce a lot of man made noise. I remember there was a commercial available stand alone unit sold by a small english company. I myself built such a unit to help reducing my noise problem especialy at 160m (I live in the middle of Berlin, Noise level in the evening is S7) But I forgot the unit during the time because I do not have an 160m Antenna any longer. 73 de Peter, DL2FI -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marinos Markomanolakis, M.D. Sent: Sunday, April 03, 2005 6:45 AM To: elecraft@mailman.qth.net Subject: [Elecraft] RF Noise canceller ? Just a question for the technically inclined group members: How feasible or worth the effort, would be the addition of an option to the K2 which would sample RF noise from a ferquency close to the used band,(tunable?) which is devoid of signals, phase invert and reinject the noise to an IF stage or even the antenna input in order to cancel our the white or pulse noise components, preserving the desired signal ? Why similar circuits are not preferred in HF receiver designs instead of DSP filters ? Similar circuits are commonly used in biomedical devices (called linear averagers if I am not mistaken) and are very effective in isolating electric signals from a particular organ eg Heart in EKG or brain area of interest in EEG, filtering out the irrelevant noise from the muscle cells... Just some food for thought. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Feasibility of KPA-1(?)
I also had a short e-mail exchange with Wayne that ended in my suggesting a new 3-band module covering 80 and two other bands (perhaps 40/30 or 40/20); I think something like this would be really valuable as we are now at a lower point of the solar cycle than when the K1 was first developed. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Feasibility of KPA-1(?)
David You only need the 11,5 MHz Xtal Elecraft is using in the standard 2 band version plus some caps. Section 1 is equipped with all parts for 80m, LPF datas can be overtaken from the K1 80m Module Section 2 is built identical to former section 1 as 40/30m Module. Peter -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of david feldman Sent: Sunday, April 03, 2005 6:38 PM To: [EMAIL PROTECTED]; elecraft@mailman.qth.net Subject: RE: [Elecraft] Feasibility of KPA-1(?) I understood that there was some inter-band dependency, but I had not considered that the 4 band module could be made to 3 bands this way. That would be good news; the 80-40-30 combination is likely the most frequently used configuration I would need. I looked at the 4-band module and many of it's components are very small, but perhaps the PC board layout still could be adapted by using the space freed from the adjacent unused band? Would the unit need software changes so it would expect this behavior in the software? 73 Dave WB0GAZ [EMAIL PROTECTED] From: Peter Zenker [EMAIL PROTECTED] To: 'david feldman' [EMAIL PROTECTED],elecraft@mailman.qth.net Subject: RE: [Elecraft] Feasibility of KPA-1(?) Date: Sun, 3 Apr 2005 18:12:34 +0200 Sorry, excuse I hit the wrong button. No my response to the mail Swiss Hams always need 80m due to their yearly traditional National Mountain Day I also had a short e-mail exchange with Wayne that ended in my suggesting a new 3-band module covering 80 and two other bands (perhaps 40/30 or 40/20); I think something like this would be really valuable as we are now at a lower point of the solar cycle than when the K1 was first developed. I could help some of them with an easy to do mod of the standard 4 Band modul. The problem is, you can only use 2 neighbour bands per section an not harmonic bands without changing of bandmodules. If you use the first section for 80 meter, you can use the second section for 40/30 Meter. 73 de Peter ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] German Manual for the T1 ATU ready
I hereby proudly anounce, that all German manuals for the T1 are ready. Of course the errata is included in the German REV A manual :-) This manuals are real manuals not only a piece of paper with a translation to be used with the original manual. The layout is 1:1 page compatible to the original. That´s sometimes not so easy because in German language the text parts are up to 30% longer. It was a great help that the original manual did not save paper by a compressed Layout :-) 73 de Peter, DL2FI www.qrpproject.de With stiff fingers now after some dozen hours of typing. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
