[Elecraft] why buy, when you can build it yourself?
http://www.dailymotion.com/video/x3wrzo_fabrication-dune-lampe-triode_tech enjoy this video... 73/72 de PA3HBB/G0BZF/PB6X ___ 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] Elecraft CW Net Report for September 21st & 22nd, 2008
Good Evening, Two very good nets. Conditions were good tonight on both 20 and 40 meters. I was able to drag in Kristinn at a 339 tonight with a little QSB. Noise on both bands was way down. I only went outside after the second net to get a few loads of wood to dry. It is getting dark very early but we have to wait for Daylight Savings time to end before we lose the Summer Triangle again. 40 meters had QSB to anyone east of me but the QRN was low. There was some static from lightning but not the roar I've been experiencing. Gain levels were both around 12 o'clock which is nice after having to keep both at maximum for the last month. Makes working the nets a lot more pleasant and much less work. I did overhear a complaint from N7AF about Arizona being humid. When I lived in Albuquerque that complaint occurred each time the humidity got into double digits! Arizona is a wetter state so I expect Dave is getting 25-30% readings :) Being from the Midwest I thought I knew something about humidity. Then I moved to Houston and found out the very great difference between 95% and 100%! Never again did I complain at 90%. Albuquerque was the other extreme: hoping to get enough water so your eyes would not make noise when they blinked ;) One time I was lying in bed looking at the ceiling wondering what I was seeing. Found out later my corneas had wrinkled and I was seeing the aberration. Hydration took on a whole new meaning while I was biking to school. On to the lists => On 14050 kHz at 2300z: K1THP - Dave - CT - K3 - 686 K4JPN - Steve - GA - K2 - 1422 NO8V - John - MI - K3 - 820 TF3KX - Kristinn - Iceland - K2 - 6425 W0CZ - Ken - ND - K3 - 457 ** QNI #245 ** N0AR - Scott - MN - K2 - 4866 K9ZTV - Kent - MO - K3 - 21 N3ND - Dan - FL - K3 - 1567 N0BK - Bruce - MN - K2 - 3646 AC0H - Kevin - IA - K2 - 4684 WA5BDU - Nick - AR - K3 - 1195 On 7046 kHz at 0200z: K1THP - Dave - CT - K3 - 686 NO8V - John - MI - K3 - 820 AB9V - Mike - IN - K3 - 398 * QNI #190 * N0SS - Tom - MO - K3 - 008 K6DGW - Fred - CA - K3 - 642 WC7S - Dale - WY - K2 - 4360 N3ND - Dan - FL - K3 - 1567 W1TF - Ty - GA - K3 - 696 N2YC - John - NY - K2 - 5949QNI #40!!! N7AF - Dave - AZ - K2 - 4795 WB5BKL - Nick - TX - K3 - 231 NS7P - Phil - OR - K2 - 4635 K6PJV - Dale - CA - K3 - 1183 N0AR - Scott - MN - K2 - 4866 W0CZ - Ken - ND - K3 - 457 Oh my, the time has not flown away. I may get done with this report before 9 PM! If there are any errors in the above lists please send the corrections via email. Now I need to make out a QSL card and send it to Kristinn. I think international postage to Iceland is $2 so I have to make a trip to the post office. Oh boy, a new DX entity! One of these days I need to collect cards for WAS too. Hopefully I can convince a few kind souls to QNI from Delaware and South Dakota, the final two states necessary for an all Elecraft WAS award. If I could gather the cards I could get WAS for myself. In my heart I would know what it really means even if I don't get the Elecraft WAS CW award from the ARRL. They really should offer one though ;) Until next week stay well, 73, Kevin. KD5ONS (Net Control Operator 5th Class) ___ 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 RX/TX Problem has been localized
John, That sounds like a leaky capacitor on the KNB2 board. The first ones to suspect are the 0.1 uf caps with 0.1 inch lead spacing. I would suggest arbitrarily replacing all of them as the first order of business. It is strange that both TX and RX are affected because the KNB2 is only in the receive path - but then, strange things can happen. 73, Don W3FPR JohnK1JD wrote: All The intermittent (cold rig only) problem cited below completely disappeared upon removal of the NB and SSB boards (replacing them with the requisite jumpers and the capacitor). The KSB2 board was put back first and the rig still behaved perfectly. However, when the NB board was plugged back in the problem returned (note - the NB function is turned off). Interesting that both RX and TX are affected. More to follow... 73, John K1JD K3/100 #071 K2/100 #583 JohnK1JD wrote: Trusty K2/100 SN#583 has a problem which is the first significant issue since building the basic K2 in Oct of 1999. The rig has been mostly unused (neglected?) since the K3 arrived last November, but decided to fire it up the other day and discovered that both RX and TX exhibit a broadband 'hash' sound instead of distinct CW when first turned on, both on signals received and on its transmitted signal. This problem lessens as the radio warms up and eventually disappears completely. I have used it quite a bit this weekend and it's been fine - until I turn it off for a few hours.The frequencies for the VCO and BFO seem OK as do the voltages. Cal PLL was performed and completed without any errors. Has anyone experienced this intermittent problem before? ___ 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 - http://www.avg.com Version: 8.0.169 / Virus Database: 270.7.0/1683 - Release Date: 9/21/2008 10:10 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
Re: [Elecraft] K2 RX/TX Problem has been localized
All The intermittent (cold rig only) problem cited below completely disappeared upon removal of the NB and SSB boards (replacing them with the requisite jumpers and the capacitor). The KSB2 board was put back first and the rig still behaved perfectly. However, when the NB board was plugged back in the problem returned (note - the NB function is turned off). Interesting that both RX and TX are affected. More to follow... 73, John K1JD K3/100 #071 K2/100 #583 JohnK1JD wrote: Trusty K2/100 SN#583 has a problem which is the first significant issue since building the basic K2 in Oct of 1999. The rig has been mostly unused (neglected?) since the K3 arrived last November, but decided to fire it up the other day and discovered that both RX and TX exhibit a broadband 'hash' sound instead of distinct CW when first turned on, both on signals received and on its transmitted signal. This problem lessens as the radio warms up and eventually disappears completely. I have used it quite a bit this weekend and it's been fine - until I turn it off for a few hours.The frequencies for the VCO and BFO seem OK as do the voltages. Cal PLL was performed and completed without any errors. Has anyone experienced this intermittent problem before? ___ 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] Accessing Filter Settings in KRX3
Having just fought through the same issue ... Enter the CONFIG menu, select the FLx options, then press SUB. Pressing SUB is the key to getting into the filter configuration items for the KRX3. At that point, set the various frequencies and gains ... don't for get to enable the appropriate fitters for each mode. LSB, USB, CW, DATA, AM and FM must EACH have the appropriate filters enables/disabled individually. 73, ... Joe, W4TV > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Roy Morris > Sent: Sunday, September 21, 2008 4:58 PM > To: elecraft@mailman.qth.net > Subject: [Elecraft] Accessing Filter Settings in KRX3 > > > I might have missed something or this just might be a dumb > question. How do the filters I have in the KRX3 kick in, and > how can they be accessed (other than through CONFIG in SUB > and the K3 Utility)? In other words, is it possible to > access KRX3 filters through XFIL? It looks like the KRX3 > filters are automatically selected depending on the bandwidth > selected on the main receiver. Is this right? Roy Morris > W4WFB ___ 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: RES: [Elecraft] ROOFING FILTERS CW PY5EG
Oms, You may either use the K3 Utility program to set up your transmit filter or you may use the K3 Config: Menu. The FLTX menu entry must be set for each mode. 73, Don W3FPR py5eg wrote: Hi Don Thanks for being so fast. Where can I pre-set the CW filter? I have the 2,7 Khz, 1,8 , 1,0 and 0,4 73 Oms -Mensagem original- De: Don Wilhelm [mailto:[EMAIL PROTECTED] Enviada em: Sunday, September 21, 2008 9:14 PM Para: py5eg Cc: elecraft@mailman.qth.net Assunto: Re: [Elecraft] ROOFING FILTERS CW PY5EG What is the filter that you have configured for CW transmit? It must be the 2.7 or 2.8 kHz filter. 73, Don W3FPR py5eg wrote: Hi Folks: I installed, 2,1 1,8 1.0 and 0,4 roofing filters on my K3. It is working perfectly on SSB, but it is no working in the other modes i.e CW. Did I make something wrong? Oms PY5EG ___ 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 - http://www.avg.com Version: 8.0.169 / Virus Database: 270.7.0/1683 - Release Date: 9/21/2008 10:10 AM No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus Database: 270.7.0/1683 - Release Date: 9/21/2008 10:10 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
RE: [Elecraft] K3 related - non-linear audio transformer behavior
Paul, Looking at the Line Out with noise from an Elecraft N-Gen indicates the K3 audio is quite dramatically band limited. With the maximum DSP high cut frequency and the 13 KHz first IF filter, broadband detected noise in either AM or SSB drops 45 dB between 4 KHz and 4.2 KHz with a further 15 dB roll off between 4.2 KHz and 9 KHz where it reaches the noise floor of the measuring device. The HF limit for data modes is also 4 KHz - depending on data sub-mode and center frequency. The HF limit for CW is approximately 2.5 KHz with the highest available "Spot" frequency and center frequency (shift). I think is it safe to treat the audio as band limited ... 73, ... Joe, W4TV > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Paul > Christensen > Sent: Sunday, September 21, 2008 4:51 PM > To: Jack Smith; Jim Brown > Cc: Elecraft List > Subject: Re: [Elecraft] K3 related - non-linear audio > transformer behavior > > > > That's why I question the applicability of a ringing test with a > > square > > wave having a rise/fall time measured in nanoseconds, as > the audio that > > makes it through the K3's crystal and DSP will not remotely > resemble that > > waveform. > > Agreed Jack, if the DSP and/or AF stages truly limit impulses > through the > transformer. To Jim's point, ignore the modulation type for > the moment and > consider an impulse noise such as that created by the start > of light switch > or AC motor. If the system received BW is wide enough (e.g., > selecting the > K3's 6 kHz, or especially the 12 kHz filter), I suspect that > transient > impulse response becomes meaningful. I have not yet tried to > sweep the K3's > audio section beyond 4 kHz and the DSP and/or audio sections > may preclude an > audio response beyond that point. > > One way of testing this is to turn on/off various types of real noise > sources as a function of selected filter BW and while > observing a scope on > the output of the line-out transformer, record the > differences in peak > values with and without terminating resistance on the transformer > secondary -- taking into account any level difference created by the > addition of the terminating resistor. > > Paul, W9AC > ___ 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
RES: [Elecraft] ROOFING FILTERS CW PY5EG
Hi Don Thanks for being so fast. Where can I pre-set the CW filter? I have the 2,7 Khz, 1,8 , 1,0 and 0,4 73 Oms -Mensagem original- De: Don Wilhelm [mailto:[EMAIL PROTECTED] Enviada em: Sunday, September 21, 2008 9:14 PM Para: py5eg Cc: elecraft@mailman.qth.net Assunto: Re: [Elecraft] ROOFING FILTERS CW PY5EG What is the filter that you have configured for CW transmit? It must be the 2.7 or 2.8 kHz filter. 73, Don W3FPR py5eg wrote: > Hi Folks: > > I installed, 2,1 1,8 1.0 and 0,4 roofing filters on my K3. > > It is working perfectly on SSB, but it is no working in the other modes > i.e CW. > > Did I make something wrong? > > Oms PY5EG > > ___ > 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 - http://www.avg.com > Version: 8.0.169 / Virus Database: 270.7.0/1683 - Release Date: 9/21/2008 10:10 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
Re: [Elecraft] ROOFING FILTERS CW PY5EG
What is the filter that you have configured for CW transmit? It must be the 2.7 or 2.8 kHz filter. 73, Don W3FPR py5eg wrote: Hi Folks: I installed, 2,1 1,8 1.0 and 0,4 roofing filters on my K3. It is working perfectly on SSB, but it is no working in the other modes i.e CW. Did I make something wrong? Oms PY5EG ___ 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 - http://www.avg.com Version: 8.0.169 / Virus Database: 270.7.0/1683 - Release Date: 9/21/2008 10:10 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] K3 COVERS MADE BY ROSE KOPP, N7HKW
My cover arrived a few days before the arrival of my (presently unopened, pending arrival of the KRX3 module) K3. The cover was what I expected and arrived here in NZ within 10 days of my order. Great service and a great product. John Powell. ZL1BHQ ___ 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] ROOFING FILTERS CW PY5EG
Hi Folks: I installed, 2,1 1,8 1.0 and 0,4 roofing filters on my K3. It is working perfectly on SSB, but it is no working in the other modes i.e CW. Did I make something wrong? Oms PY5EG ___ 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] K3 Chaining CW Messages Quirk
Jack, If I play two messages, the second one does not interrupt the first one. The only problem is that there is no gap at all between two messages. I would like to have the standard word gap between two messages. Steef PA2A K2 4654 K3 1184 - Original Message - From: "Jack Trampler" <[EMAIL PROTECTED]> To: "Elecraft Group" Sent: Sunday, September 21, 2008 9:09 PM Subject: [Elecraft] K3 Chaining CW Messages Quirk I just got my K3 (s/n 1662) up and running and I am still getting acquainted with it. I loaded some simple messages into the CW Message buffers and upon playing them back noticed an issue. If I try to chain two messages together, while the first message is playing if I press the second M# button while the first message is sending a character, the current character being sent is truncated immediately at that point. The message goes on to send the remaining characters in the message buffer and then sends the second message. If I get lucky and press the second M# button during the space between characters (and this can be tested easily at slow speeds) no character truncation takes place and both messages are sent correctly. I have all updated firmware as of two days ago. Any thoughts on this besides not to chain messages? :) Thanks & 73, Jack - N2JT [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 ___ 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] Accessing Filter Settings in KRX3
I might have missed something or this just might be a dumb question. How do the filters I have in the KRX3 kick in, and how can they be accessed (other than through CONFIG in SUB and the K3 Utility)? In other words, is it possible to access KRX3 filters through XFIL? It looks like the KRX3 filters are automatically selected depending on the bandwidth selected on the main receiver. Is this right? Roy Morris W4WFB ___ 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] K3 related - non-linear audio transformer behavior
That's why I question the applicability of a ringing test with a square wave having a rise/fall time measured in nanoseconds, as the audio that makes it through the K3's crystal and DSP will not remotely resemble that waveform. Agreed Jack, if the DSP and/or AF stages truly limit impulses through the transformer. To Jim's point, ignore the modulation type for the moment and consider an impulse noise such as that created by the start of light switch or AC motor. If the system received BW is wide enough (e.g., selecting the K3's 6 kHz, or especially the 12 kHz filter), I suspect that transient impulse response becomes meaningful. I have not yet tried to sweep the K3's audio section beyond 4 kHz and the DSP and/or audio sections may preclude an audio response beyond that point. One way of testing this is to turn on/off various types of real noise sources as a function of selected filter BW and while observing a scope on the output of the line-out transformer, record the differences in peak values with and without terminating resistance on the transformer secondary -- taking into account any level difference created by the addition of the terminating resistor. Paul, W9AC ___ 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] K3 related - non-linear audio transformer behavior
On Sun, 21 Sep 2008 13:31:00 -0400, Jack Smith wrote: >Have you considered the difference between hitting a transformer with a >fast rise / fast fall square wave and hitting it with one that is >narrowly band limited? That's one of the virtues of my measurement method -- it looks at the response of the transformer with band-limited noise as the signal source, and the band-limiting is the filters in the K3. Jim ___ 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] what is a TMP cable?
On Sun, Sep 21, 2008 at 9:13 AM, Charles Harpole <[EMAIL PROTECTED]> wrote: > > TMP cable 12" part #E850339. > > What is it for and why should I get it? It is one of the cables used for the second receiver module, KRX3. If you have the receiver module, you can start reading at page 22 of the installation and operation manual (assuming Rev. B of manual). If you did not order and receive the 2nd receiver module KRX3, then I don't know, but there shouldn't be any reason to worry. Unless you hate getting useful free stuff from companies when order from them. -Michael, VE3TIX ___ 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] Run For the Bacon - tonight!
Hello everyone! The Flying Pig's monthly "Run For the Bacon" QRP CW contest is tonight! This friendly, low pressure, 2 hour sprint runs from 9:00 to 11:00 PM Eastern DST. For all the details, please visit http://www.fpqrp.com/fpqrprun.php The Flying Pigs QRP ARCI is now maintaining an archive of previous "pig-runs" for your viewing pleasure. See you in the troughs! 73 de Larry W2LJ FP# 612 ___ 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] UK Elecraft net report for Sunday 21st September
Hi Trevor, you should join us! We discussed the merit (or otherwise) of opting to buy the LP-100 assembled and calibrated as opposed assembling and home calibrating one. I opted for getting one assembled and calibrated and one of the other net stations built his and calibrated it. We also mentioned the variability of the K3's ALC power level control and the optimistic calibration of the Acom linear amplifiers... Mine displays some 10 - 20% higher readings for output power than I measure either with the LP-100 or another meter I have. That was about the bottom line. 73 Dave, G4AON -- >/Other "almost Elecraft" topics included power measurement and especially />/the LP-100 power meters that several of us use. /That sounds interesting - care to elaborate. 73 to all Trevor G0KTN ___ 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] K3 Chaining CW Messages Quirk
I just got my K3 (s/n 1662) up and running and I am still getting acquainted with it. I loaded some simple messages into the CW Message buffers and upon playing them back noticed an issue. If I try to chain two messages together, while the first message is playing if I press the second M# button while the first message is sending a character, the current character being sent is truncated immediately at that point. The message goes on to send the remaining characters in the message buffer and then sends the second message. If I get lucky and press the second M# button during the space between characters (and this can be tested easily at slow speeds) no character truncation takes place and both messages are sent correctly. I have all updated firmware as of two days ago. Any thoughts on this besides not to chain messages? :) Thanks & 73, Jack - N2JT [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
[Elecraft] K3 arrival
For the benifit of those who are still waiting:- K3 serial number 1743 Ordered 19th May 08 Katiegram 11th September Arrived 19th September exactly four months as predicted! On air 20thSept. Jim G4NWJ ___ 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] I can't get the K-3 to go to 6 Meters
I just got it to work on 6 Meters. I was not using the direct entry key. Operator trouble. Thanks, Mike ___ 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] I can't get my K-3 to receive on xmit on 6 Meters
The band switch won't go above 30.000.00 You need to use BAND UP to go from 10 meter to 6 meter. You can't get there by tuning a VFO. 73, Lyle KK7P ___ 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] I can't get my K-3 to receive on xmit on 6 Meters
The band switch won't go above 30.000.00 Any suggestions? Thanks, Mike ___ 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] K3 related - non-linear audio transformer behavior
Have you considered the difference between hitting a transformer with a fast rise / fast fall square wave and hitting it with one that is narrowly band limited? Ignoring for the moment the difference in filter shape between Gaussian and the complex shape of the K3 crystal and DSP filters, the rise/fall time of a perfect square wave fed into a Gaussian filter is 0.34/BW, or for a 1 KHz bandwidth, 340 microseconds. I have not yet measured but hope to later today, the transformers with a slow rise/fall waveform. A rather different story can be found, I suspect, in other audio applications where the source bandwidth may easily be 20 KHz or greater, yielding a rise/fall of 17 us or less. The slowest ringing rate I found was around 125 KHz, or 8 us for a period. I can see how that might be excited by a 17 us rise/fall square wave. I just don't see the same effect occurring with 340 us rise/fall "square wave." I use quotes around "square wave" because that leads to the image of a waveform with an abrupt rise/fall which is not the case where the bandwidth is limited to a few hundred Hz or a KHz at most. That's why I question the applicability of a ringing test with a square wave having a rise/fall time measured in nanoseconds, as the audio that makes it through the K3's crystal and DSP will not remotely resemble that waveform. Jack K8ZOA Jim Brown wrote: On Sun, 21 Sep 2008 09:11:22 -0400, Paul Christensen wrote: the square-wave impulse response of the transformer becomes less meaningful. As long as there is impulse noise, the square wave response of the line out transformer is definitely relevant! As the folks at Elecraft have noted, the primary function of the Line Out is to drive data decoders of one sort or another. Those decoders see signal plus noise. Any distortion in the transformer is additional noise as far as the decoder is concerned. The square wave response of the circuit is simply another way of LOOKING at those distortion products. The analysis of the K3 Line Out that I did back in June using band noise as a source of excitation show the same problems as Jack's analysis using very different signal sources, but my excitation, being broadband, exposes the IM distortion as apparent broadening of the filter skirts. Jack measures IM using traditional two-tone methods. In other words, we both see the same problems using very different methods to study them. Those of us working in pro audio learned long ago that broadband noise (we use pink noise) is a VERY powerful analysis tool. 73, Jim Brown K9YC Audio Systems Group, Inc. ___ 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] K2/100 interconnections to a Rigblaster Plus int
Steve, Setting up the K2 is about the same as setting up any other transceiver. One must route the transceiver audio output to the soundcard line in, and The soundcard line-out must be routed to the microphone jack AF input pin - there normally needs to be an attenuator in the line, usually 10:1 (a 100k in series and a 10k in parallel across the microphone side will do) That setup will work with VOX all by itself. If you want to add automatic PTT, you need a transistor (or optoisolator) between the computer's serial port DTR or RTS signals and the PTT input of the transceiver. Many circuits to accomplish that feat have been published, and most all of them work fine. So those are the principles involved. With that knowledge, you should be able to trace through the schematic of most interface boxes to connect the proper jumpers that will establish those paths required. The 'magic' is in connecting to the correct pins through the interface box. Which microphone pins you need to connect will depend on how you have wired your K2 microphone configuration header. I don't know the internals of every interface box out there, so you will have to rely on the information provided by that box's manufacturer (or the schematic) for those details. If you follow Jim Brown's advice about bonding things together and using twisted pair lines to carry the signals, you may not need an interface box at all unless you want to switch from the soundcard connections to a microphone without changing cables. To persue that, look at his reflector posts dealing with audio interfacing. 73, Don W3FPR STEPHEN W BANKS wrote: Hello everyone, I need some help from anyone who might be able to steer me through the process of setting up my K2/100/KAT100 rig so I can do occasional digital QSOs with it. Several years ago I successfully interconnected a couple of previous K2s (not simultaneously, of course) with my Rigblaster interface to work occasional RTTY, PSK and MFSK digital QSOs at QRP. I was finishing up one of these K2s for another ham who ran out of time to finish it. The second was my own QRP K2, which I eventually sold to another ham. Both of those rigs ran digital modes very well, and I enjoyed numerous digital QSOs at QRP (5W or less). Seemed pretty easy to set up and interconnect with the interface, or so I thought. Digipan, HRD, and MixW all ran just fine. The K2s ran well too, at 5W QRP settings. Fast-forward several years to the present. My current K2/100/KAT100 has been a faithful workhorse rig for a couple of years. A few hams on the list know how devoted I am to that rig and how superbly its KAT100 tuner and 100W amplifier perform with both my antennas. An occasional SSB QSO offers a bit of diversion from CW, but CW is still my favorite mode. I thought, why not try a little digital QSOing too? Digipan, HRD, MixW and MMTTY are all present on this PC so why not dust them off, and put the Rigblaster plus back to work too? At least that what I hoped anyway. But so far I've been unable to interconnect things correctly, and my foggy memory (even a few written notes) have not helped. Is there a way to set up a K2/100/KAT100 rig for digital operation that any of you folks might recommend? With the rear panel 9-pin port on the K2 already connected to a PC COM Port and to the KAT100 via a Y-cable, I have my doubts about adding my Rigblaster Plus interface. ___ 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] K2/100 interconnections to a Rigblaster Plus int
Hello everyone, I need some help from anyone who might be able to steer me through the process of setting up my K2/100/KAT100 rig so I can do occasional digital QSOs with it. Several years ago I successfully interconnected a couple of previous K2s (not simultaneously, of course) with my Rigblaster interface to work occasional RTTY, PSK and MFSK digital QSOs at QRP. I was finishing up one of these K2s for another ham who ran out of time to finish it. The second was my own QRP K2, which I eventually sold to another ham. Both of those rigs ran digital modes very well, and I enjoyed numerous digital QSOs at QRP (5W or less). Seemed pretty easy to set up and interconnect with the interface, or so I thought. Digipan, HRD, and MixW all ran just fine. The K2s ran well too, at 5W QRP settings. Fast-forward several years to the present. My current K2/100/KAT100 has been a faithful workhorse rig for a couple of years. A few hams on the list know how devoted I am to that rig and how superbly its KAT100 tuner and 100W amplifier perform with both my antennas. An occasional SSB QSO offers a bit of diversion from CW, but CW is still my favorite mode. I thought, why not try a little digital QSOing too? Digipan, HRD, MixW and MMTTY are all present on this PC so why not dust them off, and put the Rigblaster plus back to work too? At least that what I hoped anyway. But so far I've been unable to interconnect things correctly, and my foggy memory (even a few written notes) have not helped. Is there a way to set up a K2/100/KAT100 rig for digital operation that any of you folks might recommend? With the rear panel 9-pin port on the K2 already connected to a PC COM Port and to the KAT100 via a Y-cable, I have my doubts about adding my Rigblaster Plus interface. Any and all suggestions would be MOST welcome. Thanks and 73, Steve Banks K0PQ ___ 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] K3 related - non-linear audio transformer behavior
On Sun, 21 Sep 2008 09:11:22 -0400, Paul Christensen wrote: >the square-wave impulse response >of the transformer becomes less meaningful. As long as there is impulse noise, the square wave response of the line out transformer is definitely relevant! As the folks at Elecraft have noted, the primary function of the Line Out is to drive data decoders of one sort or another. Those decoders see signal plus noise. Any distortion in the transformer is additional noise as far as the decoder is concerned. The square wave response of the circuit is simply another way of LOOKING at those distortion products. The analysis of the K3 Line Out that I did back in June using band noise as a source of excitation show the same problems as Jack's analysis using very different signal sources, but my excitation, being broadband, exposes the IM distortion as apparent broadening of the filter skirts. Jack measures IM using traditional two-tone methods. In other words, we both see the same problems using very different methods to study them. Those of us working in pro audio learned long ago that broadband noise (we use pink noise) is a VERY powerful analysis tool. 73, Jim Brown K9YC Audio Systems Group, Inc. ___ 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] Ferrite transformer losses, 43-foot vertical and the K3
On Sat, 20 Sep 2008 20:25:51 -0500, Sandy wrote: >When a high VSWR exists with a toroid ferrite balun due to a high inductive >or capacitive reactance and the toroid begins to heat, the losses will rise >to quite unacceptable losses and can possibly destroy the balun itself, even >tough the tuner used appears to have reduced the VSWR on the input side of >the circuit to a very low value. The word "balun" is far too broad and confusing in the context of this statement. Dissipation in a common mode choke wound with coax, whether on a toroid or only a string of beads (both are so-called "current baluns") is UNRELATED TO SWR. It is DIRECTLY related to IMBALANCE in the antenna. Further, the higher the choking impedance, the lower the dissipation. There appear to be significant gaps in your understanding of baluns and common mode chokes. My tutorial includes an extensive discussion of common mode chokes wound with coax. http://audiosystemsgroup.com/RFI-Ham.pdf 73, Jim K9YC ___ 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] Ferrite transformer losses, 43-foot vertical and the K3
Absolutely, Don! My main message was to watch the baluns for heating. During a contest or a long winded transmission, you can really screw up a nice ferrite balun QUICKER than one thinks. 73, Sandy W5TVW - Original Message - From: "Don Wilhelm" <[EMAIL PROTECTED]> To: Sent: Saturday, September 20, 2008 8:59 PM Subject: Re: [Elecraft] Ferrite transformer losses, 43-foot vertical and the K3 Sandy, You are correct that using a balun (either 4:1 or 1:1) is not necessarily the most efficient solution. The 'old fashioned' link coupled tuner will most always be more efficient. When the feedline input impedance (and that has nothing to do with the characteristic impedance of the feedline) is close to the output impedance of the balun, the balun will be just almost as efficient as the link coupled balanced tuner, but that rarely happens in practice. Yes, using a balun following an unbalanced transmatch is a compromise. It lends itself to easy bandswitching and its associated convenience. If one is searching for the most efficient antenna tuning mechanism, then either dedicated resonant antennas are required, or one must accept the inconveniences of changing coils in a simple balanced link coupled tuner or accept the compromises of an easy bandswitching system. The old Johnson Matchbox was an effort to provide bandswitching convenience with a link coupled balanced tuner, but even it has limited matching range compared to the simple single-band tuner designs. Bottom line, one must either accept the compromises dictated by the conveniences of bandswitching or accept the inconveniences of using the most efficient tuners that can be constructed. There is no 'best of all worlds'. 73, Don W3FPR Sandy wrote: When a high VSWR exists with a toroid ferrite balun due to a high inductive or capacitive reactance and the toroid begins to heat, the losses will rise to quite unacceptable losses and can possibly destroy the balun itself, even tough the tuner used appears to have reduced the VSWR on the input side of the circuit to a very low value. Generally a 4:1 or 1:1 transformer type balun should be preferably used for just a resistance transformation, not where there is a highly reactive component on the output side of the balun. Lots of people "get away" with this situation, but it isn't a very good idea. I commonly did this for years with very large ferrite cores and a vanilla high pass "T" network tuner (like the many MFJ and other "T" network tuners) For the last 15 years I have used nothing but the common Parallel type balanced line link coupled tuner configuration and had extremely good results with the old fashioned and sometimes very cranky to get setup right circuit. "choke" type baluns (the ones that traditionally use a large number of ferrite beads on a length of coaxial cable) are much less troublesome than the transformer type. If your "balun" setup runs cool, then you probably have hit upon a length of feeder that is "just right" and you are "OK". If it is running warm then you are treading on dangerous ground and things may be getting ready to surprise you one day with a catastrophic failure, especially when you run the legal limit! This no matter what the VSWR meter says between the tuner and the ferrite balun in question. 73, ___ 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 - http://www.avg.com Version: 8.0.169 / Virus Database: 270.7.0/1682 - Release Date: 9/20/2008 10:24 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
Re: [Elecraft] UK Elecraft net report for Sunday 21st September
>Other "almost Elecraft" topics included power measurement and especially >the LP-100 power meters that several of us use. That sounds interesting - care to elaborate. 73 to all Trevor G0KTN ___ 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] K3 AGC is better now
What did Elecraft do to the radio at the factory Charly? Was it an early K3 that never had the < 400 serial number hardware upgrade - or something else? [Elecraft] K3 AGC is better now Charles Harpole k4vud at hotmail.com Sat Sep 20 23:20:15 EDT 2008 Previous message: [Elecraft] K3 configuration question Next message: [Elecraft] 6 KHz filter and PSK31 My K3 is back from factory and the AGC now works better at handling pile ups where many callers formerly were reduced to the same audio level. Now, it is easier to pick out calls among many callers. Not absolutely great, but better. Can anyone recommend the best menu setting for max discrimination among many callers at same time? Charly K4VUD ___ 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] what is a TMP cable?
With my radio from the factory, I got a TMP cable 12" part #E850339. What is it for and why should I get it? Thanks. 73 Charles Harpole [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] K3 related - non-linear audio transformer behavior
The usefulness of the square-wave response plots (as you and I have conducted) relies primarily on the complexity of the received waveform and system bandwidth. Even in the case of a CW square-wave-like signal, a gently sloping rise/decay time (e.g., raised-cosine CW waveform), greatly reduces occupied transmitted bandwidth and the square-wave impulse response of the transformer becomes less meaningful. OTOH, if there was to exist some form of data mode in which short rise/fall times are required, then a wider, flatter, overall receive bandwidth is required. Presently, I know of no such common data modes for amateur use, but this may apply to some commercial and/or military data modulation methods. Regardless of whether this is an issue or non-issue for amateur use, I have demonstrated (on the Elecraft mail list through Yahoo) that the problem is cleanly solved in even the cheapest datacom transformers through a simple termination of the secondary winding. The peace of mind of knowing that a sound card will not be over-driven by a brief spike in transformer overshoot is certainly worth cost of a single resistor between the transformer and sound card input. Paul, W9AC - Original Message - From: "Jack Smith" <[EMAIL PROTECTED]> To: "Paul Christensen" <[EMAIL PROTECTED]> Cc: "'Elecraft'" Sent: Saturday, September 20, 2008 6:42 PM Subject: Re: [Elecraft] K3 related - non-linear audio transformer behavior Paul: I've revised my non-linear transformer page in two respects: 1. Added the plot you requested. (Almost at the bottom of the page) 2. Added square wave ringing data for four transformers, although I am not at all convinced that square wave ringing is an appropriate figure of merit for a transformer used in a narrowly bandwidth limited communications receiver. The page is: http://www.cliftonlaboratories.com/non-linear_transformer_behavior.htm Paul Christensen wrote: Jack: With regard to the plots under "Comparisons and Conclusions," and also under "Frequency Response Compared," is it possible to change the source Z from 600-ohms to 50-ohms and re-test? It would be an interesting exercise to see if THD (at ~ 1V RMS) and the high-end frequency response of the Bourns transformer changes significantly. Tnx! Paul, W9AC - Original Message - From: "Jack Smith" <[EMAIL PROTECTED]> To: "'Elecraft'" Sent: Saturday, September 20, 2008 8:02 AM Subject: [Elecraft] K3 related - non-linear audio transformer behavior I've spent the last two weeks measuring and analyzing non-linear behavior of several audio transformers, focusing on the Tamura TTC-108 used as isolation transformers in the K3. My data and analysis is now available at http://www.cliftonlaboratories.com/non-linear_transformer_behavior.htm Jack K8ZOA www.cliftonlaboratories.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 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] Another Possible 2.38 anomaly
I think I may have noticed another small bug in 2.38. If you hold REV and adjust the frequency the release rev the new frequency sticks in VFO B. But if you hold rev and adjust the filter width then release REV that does not get copied into the VFO B area. The only way to do this is to either switch to B and adjust then switch back or to use the B SET feature. Pressing mode while holding REV does nothing but its not like one can easily do that with one hand. Would be a fun one to have "on the list" yet down a ways to be able to do that some day. I'd rather have the ability to adjust filter widths and what not during TX first. On Sun, Sep 21, 2008 at 5:13 AM, <[EMAIL PROTECTED]> wrote: > I now notice that in CW mode, on any band, switching from the 2.7K filter to > the 1.8K filter (xfil 2, xfil 3) shows no change in the passband filter > graphic (remains at a total width of one bar past the tic marks)? Adjusting > the Width control will change the graphic width. In SSB mode switching > between these xtal filters results in a corresponding change (narrowing) to > the graphic. Anyone else notice this? > > 73, > Rodger > N4NRW > > filters > FM > 2.7K > 1.8K > > ___ > 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] Another Possible 2.38 anomaly
I now notice that in CW mode, on any band, switching from the 2.7K filter to the 1.8K filter (xfil 2, xfil 3) shows no change in the passband filter graphic (remains at a total width of one bar past the tic marks)? Adjusting the Width control will change the graphic width. In SSB mode switching between these xtal filters results in a corresponding change (narrowing) to the graphic. Anyone else notice this? 73, Rodger N4NRW filters FM 2.7K 1.8K ___ 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] K3 related - non-linear audio transformer behavior
Indeed, similar harmonic and IMD distortion are created inside the LINE IN transformer. The question is their level and importance. The LINE IN transformer, however, is fed by a 10:1 voltage divider, 604R in series with 62R shunted across the transformer primary. This arrangement provides a lower drive impedance to the transformer, around 56 ohms as a matter of fact. (Assumes the LINE IN port is driven by a low impedance source, which I believe is the case for the typical sound card output.) 56 Ohms is low enough to see significant THD improvement over a straight 604 ohm series resistor according to my measurements. It should be possible to measure harmonics generated by the input transformer, perhaps using the monitor function. I'm too far behind on other projects to work on it at the moment, however. Jack Paul Fletcher wrote: Jack, Thanks for the research - very interesting and it looks like a simple fix to improve the performance of the K3 significantly. You've got me wondering now though about DATA-A modes. As the K3 uses the same transformer for line in your work suggests that the transmit performance will be affected by the sound card output impedance - worth considering at least. Cheers, Paul M1PAF ___ 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 FOR SALE in Europe
Hi, I did have a lot of fun with my K2, it's building process has been watched by 40k+ hams on my website www.qsl.netpa3cev and www.qsl.net/pa3cev/KPA100 Having less time for my hobby and a K3 on my desk I don't spent enough time with it so after some hesitation decided to sell it on eBay. http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&rd=1&item=160285161064&ssPageName=STRK:MESE:IT&ih=006 vy 73 Eric PA3CEV ___ 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 QRP DXCC
Dave, congrats to Your DXCC achieved using K2. Great job friend! What's about DXCC using K2 only CW as next project ? :) Good luck on the air... 73 - Petr, OK1RP F. Reed wrote: > > Well, I am sure I am not the first one, nor the only one, but today I > worked the last station I needed to achieve DXCC QRP with my K2 serial > number 4960 (almost 50% on SSB). > I have been using it on and off since summer of 2006 when WA2DKG built > it for me (thanks Jerry!) providing me many hours of pleasure. > > Most QSOs have been confirmed via eQSL, some by LotW. No award until > they are all in, but pretty good for this chunk of the solar cycle, and > further proof (as if any were needed) of the Elecraft mojo. > > What next? Maybe DXCC with my KX-1, or my K1, or K3? I cam close to > WAS with the KX-1, so that might be the next project. > > Speak up out there; surely there are good stories of other awards and > the same ones, from the rest of you and I would enjoy hearing about them. > > 73 de Dave, W5SV > ___ > 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 > -- Petr Ourednik [EMAIL PROTECTED] -- http://ok1rp.blog.cz (Hamradio) http://topband.blog.cz (160m) http://www.qsl.net/ok1rp ___ 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] K3 AGC is better now
> Can anyone recommend the best menu setting for max discrimination among many > callers at same time? Start with Config menu: AGC SLP= 005 and then experiment with different values. The lower the value (down to 0), the louder the stronger signals will be. If you go too low, you risk overdriving your ear drums. The higher the value (up to 15), the more homogenous the loudness levels will be, independent of signal strength. 73, Barry N1EU ___ 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] UK Elecraft net report for Sunday 21st September
Several stations were not available this week, the very pleasant weather this weekend being more of an attraction than being indoors! Also some were getting ready for travel to Jura for the MS0SCG week of operating. Quite an interesting discussion took place over the use of SDR receivers in various configurations used with a K3, both via the IF output of the K3 and parallel connections. Mike (G0MJW) has an SDR-IQ, myself and Andrew (M0GJH) have Perseus receivers. Other "almost Elecraft" topics included power measurement and especially the LP-100 power meters that several of us use. Stations this week were: M0GJH, Andrew G0MJW, Mike G8EGG, Dave G4ARI, Tim G3YHM, Rod G4NWJ, Jim Thanks for the report from France by F5VJC (Deni). 73 until next week! Dave, G4AON K3/100 #80, Acom 1000, dipole antenna ___ 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] Two K3's on Jura (EU008) next week
A bunch of us are of the the Isle of Jura next week (operating Monday - Sunday inclusive) to activate the island. Two K3's will be there so listen out for us under the call MS0SCG and maybe portable also. (plug complete) 73 Paul -- View this message in context: http://n2.nabble.com/Two-K3%27s-on-Jura-%28EU008%29-next-week-tp1107466p1107466.html Sent from the Elecraft mailing list archive at Nabble.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
