RE: [Elecraft] Low receiver sensitivity
My guess is that somewhere in writing that example the numbers changed (likely because the author wanted the result to be 30 dB instead of dealing with 29.6 dB and explaining away the fact that the tenths digit is insignificant so should be rounded up). 1.48 *is* the log of 30, so apparently the quantities on the right of the equal sign were changed to reflect the log of 33, but the quantities on the left were unchanged. End result -- 'unequal equal signs' G. 73, Don W3FPR -Original Message- Bart, PA3GYU wrote: Look up Receiver Sensitivity Testing (Page 4 of the XG1 manual) and Signal-to-Noise and MDS Calculations (page 5) for instructions on how to use the XG1 to measure receiver sensitivity. I did, and found this procedure and example: A. Divide S+N by N; call the resulting ratio R. B. Take the base-10 logarithm of R (log key on most calculators). C. Multiply the result by 20 to obtain the S+N/N ratio at 1 microvolt, in dB. D. If the S+N/N is greater than 10 dB, then the MDS is approximately equal to the result from (C) subtracted from -107 dBm. Example: DMM readings of 1.0 Vrms (XG1 on), and 0.030 Vrms (XG1 off). A. R = 1.0/.03 = 33 B. log(30) = 1.52 C. 20 x 1.48 = about 30 dB (this meets the requirement for step D) D. MDS = -107 dBm - 30 dB = -137 dBm Two remarks: 1. I think the second step in the example should read: B. log(10) = 1.52. 2. I may be missing something here, but if the outcome of B) equals 1.52, why is 1.48 used in C)? (Not that it changes much, only 0.8 dB, but hey: it might confuse some people!) -- Sorry for the delay responding Bart! I've been away all day and I see that none of our other sharp-eyed contributors have answered your question! Yes, you are right. B. should read log(33) = 1.52 (the base 10 is understood unless a different base is shown and, if so, the base is shown as a subscript following log, not in parenthesis). The procedure is to take the result of A. and find the logarithm of that. I'm really confused about where the 1.48 came from!! That should be 1.52 so 20 x 1.52 = 30 dB. That instruction sheet was not one if my projects, so I never looked at that example closely. I'll pass this info along to Wayne. Ron AC7AC -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.11.8 - Release Date: 5/10/2005 ___ 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
Nye Viking Master key was Re: [Elecraft] J-37
Mike / KK5F wrote : My favorite straight key isn't any of the many military keys I have. It is the commercial Nye Viking Model 330-001 Master Key, which comes with a nicely weighted base, and with enclosed keying contacts in the base that keep all voltages off the exposed key parts. Unfortunately, I believe it is discontinued and unavailable except as old stock, and then is pretty pricey when one is located. Morse Express (www.morsex.com) still sells them . http://www.morsex.com/nye/nye330.jpg I used to have one of these as well but it was seldom used so I ended up giving it away to a young ham at Lobstercon last summer. Michael VE3WMB ___ 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] N2CQ QRP Contest Calendar May 14-31, 2005
~~ N2CQ QRP CONTEST CALENDAR May 14-31, 2005 ~~ Mid-Atlantic QSO Party (CW/SSB/FM) ... QRP Category May 14, 1600z to May 15, 0400z May 15, 1100z to 2400z Rules: http://www.qsl.net/maqso/ ~~ FISTS Spring Sprint (CW) ... QRP Category May 14, 1700z to 2100z Rules: http://www.fists.org/sprints.html ~~ CQM International DX Contest (CW/SSB) ... QRP Category May 14, 1200z to May 15, 1200z Rules: http://www.sk3bg.se/contest/cqmidxc.htm ~~ Run For The Bacon (CW) ... QRP Contest! May 16, 0100z to 0300z Rules: http://fpqrp.com ~~ NAQCC WEEKNIGHT 40/80-METER SLOW SPEED SPRINT (CW) ... QRP Contest! May 19, 0030z to 0230z Rules: http://www.arm-tek.net/~yoel/sprint_0505.html ~~ Dayton Hamvention (QRP Event - FDIM) May 20-22 Info: http://www.hamvention.org/ ~~ HIS MAJESTY THE KING OF SPAIN CONTEST (CW) May 21, 1800z to May 22, 1800z Rules: http://www.sk3bg.se/contest/kingofsp.htm ~~ EU PSK DX Contest ... Low Power (10W) Category May 21, 1200z to May 22, 1200z Rules: http://www.eudx.scotham.net/ ~~ VK/trans-Tasman Contests (80 M Ph) ... QRP Category May 21, 0800z to 1400z Rules: http://home.iprimus.com.au/vktasman/RULES.HTM ~~ Baltic Contest (CW/SSB) (80 Meters) May 21, 2100z to May 22, 0200z Rules: http://www.lrsf.lt/bcontest/english/rules_html.htm ~~ CQWW WPX Contest (CW) ... QRP Category May 28, z to May 29, 2400z Rules: http://home.woh.rr.com/wpx/ ~~ QRP ARCI Hoot Owl Sprint (CW) ... QRP Contest! May 29, 2000z to 2400z Rules: http://www.qrparci.org/contest.htm ~~ Michigan QRP Memorial Day Sprint (CW) ... QRP Contest! May 29, 2300z to May 30, 0300z Rules: http://www.qsl.net/miqrpclub/contest.html ~~ Thanks to SM3CER, WA7BNM, N0AX(ARRL), WB3AAL and others for assistance in compiling this calendar. Please foreward the contest info you sponsor to [EMAIL PROTECTED] and we will post it and give it more publicity. Anyone may use this N2CQ QRP Contest Calendar for your website, newsletter, e-mail list or other media as you choose. (Include a credit to the source of this material of course.) 72 de Ken Newman - N2CQ [EMAIL PROTECTED] http://www.amqrp.org/contesting/contesting.html http://www.n3epa.org/Pages/Contest/contest.htm ___ 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] TNX! - Off topic: beginner kit recommendations?
Mike Markowski wrote on 05/11/05 15:28 ET: My 11 year old son KB3KYB has been fascinated by my recent K2 kit building. [...] Wow, guys, I want to say thanks to each and every one who responded both on and off list! I didn't expect nearly so many replies. All are very helpful, and now I have some web surfing and a whole lot of thinking to do. Thank you very much! Mike AB3AP Avondale, PA ___ 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] J-37/J-38
The J-37 I have is a KY-116G...Very plain, austere key...IMHO it is obvious that the 2 J-38's are of far superior construction, especially the pivot bearings...The J-38's also have a shorting switch, the J-37 does not, although I would never use that feature anyway... I have a straight key labeled CEL Z. A. 16929 on the bottom of the bakelite base, and KEY W. T. 8 AMP No. 2 MK III on the top...Anyone know anything about this key?...It was a gift and I was told it was Australian... I only use these keys on SKN...I use the J-37 the most, but only because I have it mounted on a more stable home-made base... Jerry, wa2dkg Jerry wrote: The J-37 I bought (surplus) came in it's original cardboard box and was mounted on a leg clip A J-37 on the leg clip becomes a J-45 under the old Army Signal Corps naming system, or a KY-116/U under the late-WWII to present Joint Army Navy naming system. They can be often found for less than $25 new, and are a great value, IMHO. Neither of my J-38's, mounted on black bakelite plates, bears a manufacture's name. The J-38 was never intended for use in anything except Morse code classroom training sessions. It is not associated with any radio set in military service. It is probably the least durable and most cheaply made of military straight keys. Tons of them were surplused in the decades since WWII. My favorite straight key isn't any of the many military keys I have. It is the commercial Nye Viking Model 330-001 Master Key, which comes with a nicely weighted base, and with enclosed keying contacts in the base that keep all voltages off the exposed key parts. Unfortunately, I believe it is discontinued and unavailable except as old stock, and then is pretty pricey when one is located. ___ 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 to B conversion
Hi there, Long time being on this list due to K2 number 716 Now I updated the rig to a Rev B and have the following problems. Output without AT all OK When I put the AT between then no relays are heard and the display shows LO P In the menu all settings L0 through C0 the relays are clicking. Further a VFO linearisation is not possible The counter starts some where at 10839 and then after a few seconds it puts the info 232 on. Can some body help me out with this ?? Tnx in advance -- Best regards, Tom mailto:[EMAIL PROTECTED] ___ 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] Low receiver sensitivity, XG1 example
Line B. of the example should read : log(33)=1.52 Apparently there was a typo in line B that propagated into line C. The log of 30 is 1.48, that's where the value of 1.48 in line C came from. Example should read: A. R=1.0/0.03 = 33 B. log(33)=1.52 C. 20*1.52=30dB D. MDS= -107dBm - 30dB = -137dBm Let's see where the value -107dBm came from: 1 dBm means 1 milliwatt of power. In this case the load resistance is assumed to be 50 ohms, so 1 mW will produce a voltage across the 50 ohm load that is = SquareRoot( 0.001*50) = 0.224 volt rms. The XG1 output is 1 microvolt into a 50 ohm load for this test, so the ratio of it's output to the 1dBm reference signal is: 1 microvolt/0.224volt = 0.04464. The log(0.04464) = -5.35 Multiplying by 20 to convert this voltage ratio to dB, we get 20*(-5.35) = -107dB The level of the XG1 test signal is -107dBm, that is, 107dB weaker than one milliwatt. Since this produces an output from the receiver that is well above the noise level, then the minimum detectable signal would be even weaker than -107dBm. Typically for the K2 it could be around 30dB weaker (as we found in step C above), so the minimum detectable signal is approximately -137dBm. 73/ Bob - W5BIG - Original Message - From: Ron D'Eau Claire [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Thursday, May 12, 2005 1:24 AM Subject: RE: [Elecraft] Low receiver sensitivity Bart, PA3GYU wrote: Look up Receiver Sensitivity Testing (Page 4 of the XG1 manual) and Signal-to-Noise and MDS Calculations (page 5) for instructions on how to use the XG1 to measure receiver sensitivity. I did, and found this procedure and example: A. Divide S+N by N; call the resulting ratio R. B. Take the base-10 logarithm of R (log key on most calculators). C. Multiply the result by 20 to obtain the S+N/N ratio at 1 microvolt, in dB. D. If the S+N/N is greater than 10 dB, then the MDS is approximately equal to the result from (C) subtracted from -107 dBm. Example: DMM readings of 1.0 Vrms (XG1 on), and 0.030 Vrms (XG1 off). A. R = 1.0/.03 = 33 B. log(30) = 1.52 C. 20 x 1.48 = about 30 dB (this meets the requirement for step D) D. MDS = -107 dBm - 30 dB = -137 dBm Two remarks: 1. I think the second step in the example should read: B. log(10) = 1.52. 2. I may be missing something here, but if the outcome of B) equals 1.52, why is 1.48 used in C)? (Not that it changes much, only 0.8 dB, but hey: it might confuse some people!) -- Sorry for the delay responding Bart! I've been away all day and I see that none of our other sharp-eyed contributors have answered your question! Yes, you are right. B. should read log(33) = 1.52 (the base 10 is understood unless a different base is shown and, if so, the base is shown as a subscript following log, not in parenthesis). The procedure is to take the result of A. and find the logarithm of that. I'm really confused about where the 1.48 came from!! That should be 1.52 so 20 x 1.52 = 30 dB. That instruction sheet was not one if my projects, so I never looked at that example closely. I'll pass this info along to Wayne. Ron 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] Which hand do you use?
Thanks to all who have responded to the Handedness survey (49) so far. I'm going to be in Reno Fri - Sun (Va Hospital appt and weekend with with #2 son and family) . Still time to get included ... I'm going to publish the results on Tue, 17 May. Please '86' my statement that comments will probably be ignored. They are very interesting, and I've changed my mind! Not sure how to use them yet, but they are enlightening. Out of 49 respondents, and a world average of 10% left-handers (that would be 4.9%), it seems my friend might have been right. Either the fraction of hams who are sort of to really left-handed is larger than 10%, or possibly it's because we're mainly male? Stay tuned Fred K6DGW Auburn CA CN98lw ___ 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
SOLD [Elecraft] FS: K2/100 SOLD
The K2/100 has been sold ... thanks Tim NZ8J - Original Message - From: NZ8J [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Monday, May 09, 2005 2:26 AM Subject: [Elecraft] FS: K2/100 I have for sale a K2/100 (serial number 4486) it has the following options: SSB NB 160 meters DSP filter module ___ 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] **SOLD** FS: Schurr Profi-2 CW Paddle *SOLD**
The key has been sold... Thanks Tim NZ8J - Original Message - From: NZ8J [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Monday, May 09, 2005 2:56 AM Subject: [Elecraft] FS: Schurr Profi-2 CW Paddle Lots of cw operators here, so. Excellent condition, very nice paddle, read the eHam reviews. I am used to a wider spacing on the paddles and am too old to change. :) Will sell for $195 plus shipping. Thanks Tim NZ8J ___ 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] **UPDATE** Trade Wilderness Sierra for Elecraft KX1 **UPDATE**
Will also take cash offers or trade for a small 100 watt solid rig of some type.. please make offer if you're interested Thanks Tim NZ8J - Original Message - From: NZ8J [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Monday, May 09, 2005 2:51 AM Subject: [Elecraft] Trade Wilderness Sierra for Elecraft KX1 I have for trade a Wilderness Sierra in excellent condition with the following options: KC2 digital readout/power meter/memory keyer/S-meter Buzznot noise blanker All 9 band modules 160/80/40/30/20/17/15/12/10 meters The 40/20/15/10 meter modules are built, the others are unbuilt as they came from Wilderness Radio The 40 meter and 20 meter modules put out 2+ watts, the 10 and 15 meter modules need to be troubleshot and aligned. It also has the ABX xtal bandwidth filter control on the front panel. I have all the manuals for it. I just bought this to use when I go motorcycle mobile, but would found that it would be easier to have a smaller more compact setup with the tuner, power supply, etc in the same box, so I would like to trade this package for a Elecraft KX1 with the auto tuner and 30 meter module. Please email for more info if needed. Thanks Tim Nz8J ___ 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] QST: CW vs Text Message Contest on NBC's Tonight Show Friday
Posting this because of the CW component. Hi All, Christie K0IU at HRO Burbank just informed me that Chip K7JA (Yaesu) and a traffic handler friend will be competing on NBC's Tonight Show with Jay Leno against a pair of cellphone text messengers to see who can transmit a message the fastest. According to Christie the competition will be airing tomorrow night (Friday May 13th). This was confirmed by Chip's wife Janet KL7MF who was manning the other cash register at HRO this afternoon. Get your TiVOs programmed!! 73 de Mike, W4EF... I know Chip. Why do I think the 'CW' will easily beat the cell phone message system... Lets watch...73, Art W6KY ___ 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] QST: CW vs Text Message Contest on NBC's Tonight Show Friday
Art - W6KY wrote: I know Chip. Why do I think the 'CW' will easily beat the cell phone message system... Because it already has: http://www.timesonline.co.uk/printFriendly/0,,1-2-1571664,00.html And in other news, would you believe broadband over gas line? http://www.nethercomm.com Ya can't make this stuff up... 73 de Maggie K3XS -- -/___. _)Margaret Stephanie Leber CCP, SCJP/The art of progress / /(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ ---/ / | / | _ _ _` _ AOPA 925383/ amid change and to / --/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ -/ (_/ '.-/ .-/ARRL 39280 /order.-A.N.Whitehead/ /(_/_(_/___AMSAT 32844_/[EMAIL PROTECTED]/ ___ 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] Which hand do you use?
Of course the results could be skewed since it is not a completely random survey as well. That is, you are tallying results from only those who responded. Maybe those folk who are left handed felt more compelled to respond than those who are right handed. Interesting, nonetheless, as to your results and I'll be anxious to see the final tallies. Mark, NK8Q Right Handed, Iambic B Straight Key, non-Bug user. Fred Jensen wrote: Thanks to all who have responded to the Handedness survey (49) so far. I'm going to be in Reno Fri - Sun (Va Hospital appt and weekend with with #2 son and family) . Still time to get included ... I'm going to publish the results on Tue, 17 May. Please '86' my statement that comments will probably be ignored. They are very interesting, and I've changed my mind! Not sure how to use them yet, but they are enlightening. Out of 49 respondents, and a world average of 10% left-handers (that would be 4.9%), it seems my friend might have been right. Either the fraction of hams who are sort of to really left-handed is larger than 10%, or possibly it's because we're mainly male? Stay tuned Fred K6DGW Auburn CA CN98lw ___ 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] QST: CW vs Text Message Contest on NBC's Tonight ShowFriday
The Guinness World's record for their stock sentence is 57.75 seconds. That works out to a leisurely 24 wpm. I don't see any contest here as long as Chip can send better than 24 wpm. Here's the Guinness sentence required for record attempts: The razor-toothed piranhas of the genera Serrasalmus and Pygocentrus are the most ferocious freshwater fish in the world. In reality they seldom attack a human. No abbreviations or predictive words can be used. They have to send it letter by letter. It will be interesting to see what text they use on Leno. Eric KE6US -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Art - W6KY Sent: Thursday, May 12, 2005 6:43 PM To: elecraft@mailman.qth.net Subject: [Elecraft] QST: CW vs Text Message Contest on NBC's Tonight ShowFriday Posting this because of the CW component. Hi All, Christie K0IU at HRO Burbank just informed me that Chip K7JA (Yaesu) and a traffic handler friend will be competing on NBC's Tonight Show with Jay Leno against a pair of cellphone text messengers to see who can transmit a message the fastest. According to Christie the competition will be airing tomorrow night (Friday May 13th). This was confirmed by Chip's wife Janet KL7MF who was manning the other cash register at HRO this afternoon. Get your TiVOs programmed!! 73 de Mike, W4EF... I know Chip. Why do I think the 'CW' will easily beat the cell phone message system... Lets watch...73, Art W6KY ___ 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] k2: no cw sidetone anymore...
I put in a k60xv board and the new firmware. i also did the cw bandwidth mod. now i have no cw sidetone. any ideas? it was just fine before the mods. ed wa3drc ___ 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] Tuner efficiency question
I've been using my QRP K2 for the last 2-3 years with a full sized Palstar tuner. I use a variety of antennas from 160 to 10 meters, fed with coax, ladder line, choke baluns, the Elecraft balun, etc. I'm thinking about going to an auto tuner (Dayton Hamvention coming). Has anyone compared the efficiencies of the very small tuner like the T1, the KAT2, and larger tuners like the Palstar? (I've been the Johnson KW Matchbox route as well.) Intuition tells me there is something lost when going to very small components packed into a tiny space compared to large air variables, big roller inductors, etc., but I don't have anything to back up that gut feel. Anyone make any measurements? Parker K2 2636 WD8JOL ___ 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] for interested Dayton attendees
I will be demo'ing my E-Meter digital wide dynamic range power/SWR meter at the SteppIR booth at Dayton this year. The E-Meter will be of interest to Elecrafters bcause it provides accurate power readings from 10mw to 2500W, and accurate SWR readings from 50mw to 2500W. The demo will include my K2 as the power source, and a Bird 4410A wattmeter for comparison. The E-Meter will be available in kit or assembled form, and has also been accepted for publication in an upcoming issue of QEX for you homebrewers. The prototype unit can be seen on my website with details, www.telepostinc.com/n8lp.html. The final version will be offered in an all metal case closely resembling the EC1 case used for the K1. It is autoranging, and has very good accuracy. The meter has a built-in frequency counter which allows precise in-the-field calibration at up to 154 frequency/power combinations, with extrapolation between cal points. I plan to offer a calibrator mini-kit as well. Assembled units will be delivered calibrated on all bands from 160-6m, and at 10W, 100W and 1000W. The E-Meter has a serial port for remote or PC control, and comes with a freeware virtual control panel for Windows. For more info, contact me off list. 73, 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
[Elecraft] K2 4875 ALIVE!
Hi Gary. I'm glad to say that my K2 is now fully alive! I had a bad solder joint on the 12 v line to the final amp. Now proceeding with construction of SSB and ATU. Thanks for your help. 73's Yves Dussault-VE2ATD Laval, Québec.___ 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] k2: no cw sidetone anymore...
Ed WA3DRC wrote: I put in a k60xv board and the new firmware. i also did the cw bandwidth mod. now i have no cw sidetone. any ideas? it was just fine before the mods. -- Check your sidetone source, Ed. MENU, STL press/hold MENU to enter sidetone level set mode, the tap DISPLAY to toggle between U6-25 and U8-4. You will probably find the tone at U8-4. Ron 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
RE: [Elecraft] k2: no cw sidetone anymore...
The new firmware has a new submenu that allows you to select whether sidetone comes from U6-25 or U8-1. With the mods required with the new firmware, you don't have a choice. You MUST select sidetone from U8 or it won't work. Eric KE6US -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Finn Sent: Thursday, May 12, 2005 7:26 PM To: elecraft@mailman.qth.net Subject: [Elecraft] k2: no cw sidetone anymore... I put in a k60xv board and the new firmware. i also did the cw bandwidth mod. now i have no cw sidetone. any ideas? it was just fine before the mods. ed wa3drc ___ 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] k2: no cw sidetone anymore...
guys, tnx! found it! ed wa3drc - Original Message - From: EricJ [EMAIL PROTECTED] To: 'Ed Finn' [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Thursday, May 12, 2005 11:08 PM Subject: RE: [Elecraft] k2: no cw sidetone anymore... The new firmware has a new submenu that allows you to select whether sidetone comes from U6-25 or U8-1. With the mods required with the new firmware, you don't have a choice. You MUST select sidetone from U8 or it won't work. Eric KE6US -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Finn Sent: Thursday, May 12, 2005 7:26 PM To: elecraft@mailman.qth.net Subject: [Elecraft] k2: no cw sidetone anymore... I put in a k60xv board and the new firmware. i also did the cw bandwidth mod. now i have no cw sidetone. any ideas? it was just fine before the mods. ed wa3drc ___ 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] Which hand do you use?
Thanks to all who have responded to the Handedness survey (49) so far. Out of 49 respondents, and a world average of 10% left-handers (that would be 4.9%), it seems my friend might have been right. Either the fraction of hams who are sort of to really left-handed is larger than 10%, or possibly it's because we're mainly male? The number of lefties in the general population may be closer to 13%. In addition to problems with your sample (your respondents choose themselves, which isn't the greatest sampling method) the other problem is that your sample size is too small to draw conclusions from. If you get 100 responses you can be 90% sure that the actual percentage of lefties is +/- 5.53%. So if you see 10 out of 100 (assuming your sample is truly random, which it's not) then you can be 90% sure that the actual value is between about 4% and 16%. That's quite a spread. If you want even more confidence -- say 99% -- you're in bigger trouble. You'll need a sample size of 7562 to be accurate to +/- 1%. With your current sample size of 49, if you get a result of 13 lefties you can be 99% certain that the actual percentage of left-handed hams is between 1% and 25%! Craig NZ0R N622T ___ 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] Tuner efficiency question
Parker et al, QST did a review and test of a bunch of balanced tuners a year or so back. I don't remember too much of it now but remember being shocked at how high the losses typically were. As I recall efficiency ran in the 65 to 75 percent range for many of them. The Johnson matchbox was the most efficient by far (90% or more??) but did not cover all bands. I have not really studied this issue but have always been interested. My gut feel is that often much of the loss in these tuners (when driving a balanced line) is in the internal balun which is at the output of typical tuners and is driving a balanced line to the antenna which often has a horrendous SWR. The high SWR on the balanced line is not itself a problem because balanced twin line or ladder line feeders can easily handle the high currents and voltages with low losses but the poor balun can quickly get too hot to touch because of the high circulating currents within the balun. Don K7FJ K2 4438 I've been using my QRP K2 for the last 2-3 years with a full sized Palstar tuner. I use a variety of antennas from 160 to 10 meters, fed with coax, ladder line, choke baluns, the Elecraft balun, etc. I'm thinking about going to an auto tuner (Dayton Hamvention coming). Has anyone compared the efficiencies of the very small tuner like the T1, the KAT2, and larger tuners like the Palstar? (I've been the Johnson KW Matchbox route as well.) Intuition tells me there is something lost when going to very small components packed into a tiny space compared to large air variables, big roller inductors, etc., but I don't have anything to back up that gut feel. Anyone make any measurements? Parker K2 2636 WD8JOL ___ 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] Tuner efficiency question
Parker Don; I haven't tried to measure the efficiency of the Elecraft tuners. It is a fairly difficult measurement to make correctly when the input and output impedance are significantly different. However, there are two effects to consider in tuner efficiency. At high power, an inefficient tuner can generate significant amounts of heat, which can destroy components. A 1kW transmitter into a 70% efficient tuner will generate 300 watts of heat in the tuner. The second effect is the loss of signal at the receive station. A 90% efficient tuner will lose 0.5 dB; a 70% efficient tuner will lose 1.5 dB. The 1 dB difference will not have any noticeable effect on the ability to receive CW. Even on digital modes, it will only have a minor effect on the received error rate. Other factors, such as QSB, QRM, or QRN, will have a bigger effect. As long as the Elecraft tuners are reasonably efficient, they shouldn't have any significant effect on your ability to communicate. -John KI6WX Parker et al, QST did a review and test of a bunch of balanced tuners a year or so back. I don't remember too much of it now but remember being shocked at how high the losses typically were. As I recall efficiency ran in the 65 to 75 percent range for many of them. The Johnson matchbox was the most efficient by far (90% or more??) but did not cover all bands. I have not really studied this issue but have always been interested. My gut feel is that often much of the loss in these tuners (when driving a balanced line) is in the internal balun which is at the output of typical tuners and is driving a balanced line to the antenna which often has a horrendous SWR. The high SWR on the balanced line is not itself a problem because balanced twin line or ladder line feeders can easily handle the high currents and voltages with low losses but the poor balun can quickly get too hot to touch because of the high circulating currents within the balun. Don K7FJ K2 4438 I've been using my QRP K2 for the last 2-3 years with a full sized Palstar tuner. I use a variety of antennas from 160 to 10 meters, fed with coax, ladder line, choke baluns, the Elecraft balun, etc. I'm thinking about going to an auto tuner (Dayton Hamvention coming). Has anyone compared the efficiencies of the very small tuner like the T1, the KAT2, and larger tuners like the Palstar? (I've been the Johnson KW Matchbox route as well.) Intuition tells me there is something lost when going to very small components packed into a tiny space compared to large air variables, big roller inductors, etc., but I don't have anything to back up that gut feel. Anyone make any measurements? Parker K2 2636 WD8JOL ___ 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] Tuner efficiency question
I haven't had lots of different tuners to compare myself, but I do have a Johnson KW Matchbox tuner. It does a great job on Balanced lines. I didn't really know about the Palastar but just checked it out on the website. Looked like an interesting tuner. But to me the downside of it was that there is a balun on the output, which of course as Don stated is a dominating factor in losses in a tuner (at least maybe that is what I took away from his comments as well as other discussions on this subject in the past). Is there a modern tuner out there for balanced lines that doesn't use a balun? Maybe the proper comparison for more apples to apples comparison should be made for tuners that are designed for type of feedline output or maybe Hi-Z vs Lo-Z, as most today, including the Elecraft, are likely moreso designed not for balanced line output and Hi-Z but coaxial output and Lo-Z. Sure, many tuners may also have a balanced line output option, but that is likely there as a convenience or for marketing or whatever but is really just added on as compared to the overall tuner being designed for Hi-Z and balanced output. While I like my Johnson KW tuner for certain antennas I may opt for some other tuner for other types of antennas. The type of tuner should be considered as a whole in the antenna system, not as a one size fits all solution (unless there is a tuner out there that really can do both ends of the spectrum equally well). When I first started getting back into QRP just over one year ago I had my RockMite-40 sitting on top of the Johnson KW Matchbox. It was going to a resonant antenna and didn't go through the tuner. Even though the Matchbox is supposedly a low loss antenna tuner it did seem like there was something just wrong about using it with a QRP rig, maybe like some sort of sacralidge in its own way, but maybe that is just me. Maybe the purist would say that only resonant antennas should be used so a tuner is not needed. Okay, that makes some sense, but maybe I can get an antenna with better overall performance than the extra losses involved when using a tuner. Again, the whole systems needs to be evaluated an not just individual parts of a system. If individual parts are selected because they are the best but when put together they don't work so well collectively it doesn't seem like a good solution. Maybe a tuner with more versatility even if it has slightly higher losses is a better solution for the next ham who doesn't use just one antenna at a fixed location all the time. Certainly as QRPers we are all aware that antenna systems are quite important and band conditions really dominate how well we can communicate. But really, given good band conditions and being able to somehow get some signal to something to radiate things will result in being able to communicate. I just installed the KAT2 in my K2 and am amazed at how fast it tunes. I haven't tried it with a variety of different antenna configurations, so I can't comment much on its verstatility. Unfortunately I'm not currently using my balanced feedline antenna anymore due to a change in QTH and a temporary hamshack setup, but the KAT2 seems to suit my needs for now. If anything, at this time the Matchbox at least still looks quite respectable sitting on the bench (farther away from the K2 than when I had the RockMite sitting on top of the Matchbox, HI! HI!). I hope my late night ramblings make some sense. Sorry if they don't. Mark, NK8Q K2 4876 ___ 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
