Re: [Elecraft] P3 "Tuning Noise"
On 10/27/2011 11:28 AM, Fred Jensen wrote: > The higher I set the averaging, the more I see the > effect since the band noise on the baseline gets compressed with more > averaging. That's when you want the Fixed Tune mode in the P3. Averaging has the effect of maximizing signals and minimizing purely random noise. The display stays in the same frequency range, while you tune across it. This way, the average does not reset as you tune, so you see the noise stay down. FAR more useful. You need a version of the P3 firmware that's newer than about 9 months. V1.09, I think, is when it was introduced. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 Diversity Macro
This macro simplifies switching the K3 into diversity receive mode. This K3 configuration and antennas are required: 1) KRX3 second receiver 2) KXV3A or KXV3 RF I/O module 3) The main TX antenna is used for receive along with a separate RX antenna.The RX antenna is connected to both the KXV3/A RX ANT input and the SUB RX AUX RF input via a BNC T adapter or Magic-T type 3dB splitter. The RX antenna is the default receiving antenna - the RX ANT button's state shows RX highlighted on the display. Here's the macro: SWT13;SWT13;FT1;RT0;XT0;UPB4;DV1;SWT25; VFO B is set to VFO A all parameters; Split TX is enabled; any RIT/XIT offsets are zeroed; the split frequency is set to 2 kHz up; diversity mode is enabled; the RX ANT is disengaged to allow the main RX to use the TX antenna for receive. Note SWT25; toggles the state of the RX ANT button. The macro assumes it's enabled before switching to diversity RX. If you have two separate RX antennas/arrays, connect one to RX ANT and the other to AUX RF and remove SWT25; from the macro string. To turn off diversity receive use this macro: DV0;SWT25; This OFF macro also switches the main RX back to the RX antenna from the TX antenna or to the dedicated RX antenna connected to RX ANT. I set the first macro to Tap-M4 and the second to Hold-M4. This dedicates a single button to control diversity RX ON/OFF. This diversity ON macro eliminates the need to hold the SUB button while the K3 syncs VFOs and enables diversity mode. If operating split while in diversity mode, to hear and adjust your TX split frequency, hold the REV button and tune with VFO A not the sub VFO B knob. Release to listen to the station of interest. If you haven't tried it, the K3's diversity RX capability is a very valuable low band weak signal receiving tool. 73 - Steve WB6RSE __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] New product suggestion
Tom is a really good antenna designer. He has some interesting antennas on his new site. Running the business was never a strong point. F12 suffered from many of the same issues. Mike W0MU J6/W0MU November 21 - December 1 2011 CQ WW DX CW W0MU-1 CC Cluster w0mu.net On 10/27/2011 6:13 PM, W8JH wrote: > I spent 7 weeks trying to get that antenna from N6BT but Tom never came > through with a delivery date for my order much less produce the antenna. I > sent emails to three different email addresses he gave me and multiple calls > to his cell phone went unanswered. A real shame as I really wanted to give > the Q-52 antenna a try. > > After wasting all that time I ordered a Cushcraft MA-5B on their website > after hours on Monday and it arrived at my house Thursday. Really wish I > had started there. > > 73, > > Joe, W8JH > > - > 73, > > Joe, W8JH > K3 1713, KPA 132 > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/New-product-suggestion-tp6931309p6938489.html > Sent from the Elecraft mailing list archive at Nabble.com. > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] New product suggestion
I spent 7 weeks trying to get that antenna from N6BT but Tom never came through with a delivery date for my order much less produce the antenna. I sent emails to three different email addresses he gave me and multiple calls to his cell phone went unanswered. A real shame as I really wanted to give the Q-52 antenna a try. After wasting all that time I ordered a Cushcraft MA-5B on their website after hours on Monday and it arrived at my house Thursday. Really wish I had started there. 73, Joe, W8JH - 73, Joe, W8JH K3 1713, KPA 132 -- View this message in context: http://elecraft.365791.n2.nabble.com/New-product-suggestion-tp6931309p6938489.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Band Pass Filters for QRP
Jack, 20-30 feet separation puts your antennas in each others' near fields, and they become coupled together [i.e. you're trying to receive on conductors that are actually parasitically part of your partner's transmit antenna]. Invest in a roll of coax and get them at least a couple of wavelengths apart, more is better. It'll make a big difference, and may get the QRM down to levels the K3 can handle. You may still need a couple of filters for 80/40 operation, the the higher frequency bands may turn out OK. Don't even think about 80/75 operation, we fried the T/R switch diodes in a K3 when someone tried that at our M/2 CQP expedition. 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org On 10/27/2011 2:21 PM, Jack Nelson wrote: > We are generally using K3s and W3EDP antennas or maybe a Buddipole. The > antennas are 20-30 feet apart, so as you might guess, If one of us is on 40, > the guy operating on 20 knows it and visa versa. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Band Pass Filters for QRP
W3NQN wrote a nice series of articles for QST on bandpass filters, a couple of which were targeted specifically for QRP operations during Field Day. The design I liked uses a band reject element at the next harmonic frequency. You can make your own filters from those articles, and they are quite small in size due to the use of small ferrite cores for the inductors. 73, Dave AB7E On 10/27/2011 2:21 PM, Jack Nelson wrote: > Good afternoon all. I have a question and would appreciate everyone's > thoughts. I've started trying to get to the field with a buddy of mine. We > take a popup camper and have a day or two operating event. We keep running > into a problem if we both decide to set up stations. > > We are generally using K3s and W3EDP antennas or maybe a Buddipole. The > antennas are 20-30 feet apart, so as you might guess, If one of us is on 40, > the guy operating on 20 knows it and visa versa. While the K3 can do alot to > minimize the interference, it's not something you'd want to listen to for > very long. > > What options might be out there. We are aware of W3NQN bandpass filters, at > $105-$125 a band, that can get expensive quick. But that's not the real > problem. 6 of them is almost the size of them is almost the size of the > radio. I don't really need filters capable of 200W. I'm looking for > something closer to QRP levels. Even 20-30W would probably work, as it would > allow for some of the backpacker type amps. > > I know the W3NQN filter, or some of their cloans would do the job, but I'd > like something smallerIF I don't have to compromize too much in > performance. > > Any suggestions would be appreciated. > > 73's Jack K5FSE > Treas QRP ARCI > > jack.nel...@mindspring.com > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Remote Control of K3 with iPhone/iDevice
Thank you Poul. I am happy to hear you find the program useful. I didn't add USB or LSB buttons because the app is designed for CW and data users. Also space is limited on the small iPhone screen. You may want to create some memories that hold your call sign and other frequently transmitted text. That way you can avoid using the iPhone keyboard as much. I still need to work on audio. Maybe incorporating it into the app would be a better solution than Skype. I will be looking into this. Mike, ks7d EL87uu Sent from my iPhone On Oct 27, 2011, at 4:40 PM, Poul Erik Karlshøj (PKA) wrote: > Hi Mike > Just having had my first experience with K3/iPhone - and I am thrilled! Had > my first CW QSO with it - at speed 20 wpm which is at the limit of my typing > capabilities on the small iPhone screen (a mix of letters and numbers as we > have in our calls is particularly cumbersome on the iPhone kybrd!). It is not > a solution you would like to use for rag chewing - but it makes it feasible > to check in on the CW frequencies and say hello to your friends from time to > time. I think the included macros will make the programme useful for just > about everyone having each their preferred macros for commands not found on > the screen elsewhere (So far I needed it for AF level, sidetone level, > selecting LSB/USB and for ATU activation). > > I am a 100% CW opr, but never the less, why is it that there is no button, so > i need to send a K3 command in order to select LSB or USB? > > It's a great new use of the iPhone! For the audio I use Skype which works OK, > but it is not best suited for CW. > 73 and again thanks for a nice piece of SW Mike > > Poul-Erik OZ4UN > > > -Oprindelig meddelelse- > Fra: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] På vegne af Bill Brooks > Sendt: 7. oktober 2011 04:41 > Til: Mike KS7D > Cc: Reflector > Emne: Re: [Elecraft] Remote Control of K3 with iPhone/iDevice > > Mike, > > Wow. Steve Jobs would have been proud. Just pointed out to the XYL I can sit > in the den with the ballgame on, IPad in hand and work a little RTTY. > > This is just cool. > > Thanks, Mike. > > Bill, KE5OG > > > > On Mon, Oct 3, 2011 at 2:18 PM, Mike KS7D wrote: > >> Yes, adding streaming audio to the app is a goal down the road if >> there is enough user interest in these apps. >> >> Mike, ks7d >> EL87uu >> Sent from my iPhone >> >> On Oct 3, 2011, at 1:17 PM, Wayne Burdick wrote: >> >>> Way cool, Mike! I'll be giving K3iConnect a try. >>> >>> Are you also looking at streaming audio directly through your app so >>> that Airfoil is not needed? >>> >>> Wayne >>> N6KR >>> >>> On Oct 3, 2011, at 8:49 AM, Michael Downs wrote: >>> I have two apps in the Apple App Store that allow you to remotely control your K3 using your iPhone, iPad, or iPod Touch. These apps are free as I want to encourage those who are interested to try them out and provide me feedback on any bugs discovered and enhancements desired. The apps use two different approaches to communicate with the K3 from your iDevice. K3iConnect establishes an ad hoc network with a wifi serial adapter that fits in the RS232 port on the K3. Thus, no PC/Mac or cables are required and the K3 can be remotely controlled from anywhere within 30+ feet of the radio. K3iNetwork uses your local WiFi network and PC/Mac to communicate with the K3. In this case you need to have your K3 tethered to your PC or Mac via an RS232 cable. The advantage here is that sound from the K3 line out can be streamed to the iDevice with a third party app such as Airfoil. Both apps will work with the P3. I have used these apps to carry on CW and data QSOs with other amateurs. I think they are an exciting addition to the Elecraft Mojo, but they also need the benefit of users ideas on how to make them better. Also, maybe other iDevice or Android developers will be inspired to develop their own apps to add even more capabilities. Enjoy! Mike, ks7d >>> >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net Please help support this >>> email list: http://www.qsl.net/donate.html >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net Please help support this email >> list: http://www.qsl.net/donate.html >> > __ > Elecraft mailing list > Home: http:/
Re: [Elecraft] Band Pass Filters for QRP
Once very simple solution that will provide more than 30 dB attenuation of the undesired signal is a coax stub. It's just a length of coax connected to the main transmission line with a "T" connector that is cut to the proper length to attenuate the signal from the other station. And, yes, you can use several of them in parallel. A couple of on-line references for building them are: http://www.k1ttt.net/technote/onestub.html http://www.k1ttt.net/technote/onestub.html 73, Ron AC7AC -Original Message- Good afternoon all. I have a question and would appreciate everyone's thoughts. I've started trying to get to the field with a buddy of mine. We take a popup camper and have a day or two operating event. We keep running into a problem if we both decide to set up stations. We are generally using K3s and W3EDP antennas or maybe a Buddipole. The antennas are 20-30 feet apart, so as you might guess, If one of us is on 40, the guy operating on 20 knows it and visa versa. While the K3 can do alot to minimize the interference, it's not something you'd want to listen to for very long. What options might be out there. We are aware of W3NQN bandpass filters, at $105-$125 a band, that can get expensive quick. But that's not the real problem. 6 of them is almost the size of them is almost the size of the radio. I don't really need filters capable of 200W. I'm looking for something closer to QRP levels. Even 20-30W would probably work, as it would allow for some of the backpacker type amps. I know the W3NQN filter, or some of their cloans would do the job, but I'd like something smallerIF I don't have to compromize too much in performance. Any suggestions would be appreciated. 73's Jack K5FSE Treas QRP ARCI jack.nel...@mindspring.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 "Tuning Noise"
Robby, Do you have your Quick Memories set up? For me they are at least as useful as the band stacking registers I had on my previous radio. Rick K6LE On 10/27/2011, at 11:29 , Robby.VY2SS wrote: > Fred, > Don't look at the P3 when you are fast tuning the K3. > The K3 seems to require a lot more dial winding than any other rig I have > ever had. Not that I'm switching back to anything. I sure do miss triple > bandstacking registers. > > -Robby > VY2SS > > -- __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Band Pass Filters for QRP
Good afternoon all. I have a question and would appreciate everyone's thoughts. I've started trying to get to the field with a buddy of mine. We take a popup camper and have a day or two operating event. We keep running into a problem if we both decide to set up stations. We are generally using K3s and W3EDP antennas or maybe a Buddipole. The antennas are 20-30 feet apart, so as you might guess, If one of us is on 40, the guy operating on 20 knows it and visa versa. While the K3 can do alot to minimize the interference, it's not something you'd want to listen to for very long. What options might be out there. We are aware of W3NQN bandpass filters, at $105-$125 a band, that can get expensive quick. But that's not the real problem. 6 of them is almost the size of them is almost the size of the radio. I don't really need filters capable of 200W. I'm looking for something closer to QRP levels. Even 20-30W would probably work, as it would allow for some of the backpacker type amps. I know the W3NQN filter, or some of their cloans would do the job, but I'd like something smallerIF I don't have to compromize too much in performance. Any suggestions would be appreciated. 73's Jack K5FSE Treas QRP ARCI jack.nel...@mindspring.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Remote Control of K3 with iPhone/iDevice
Hi Mike Just having had my first experience with K3/iPhone - and I am thrilled! Had my first CW QSO with it - at speed 20 wpm which is at the limit of my typing capabilities on the small iPhone screen (a mix of letters and numbers as we have in our calls is particularly cumbersome on the iPhone kybrd!). It is not a solution you would like to use for rag chewing - but it makes it feasible to check in on the CW frequencies and say hello to your friends from time to time. I think the included macros will make the programme useful for just about everyone having each their preferred macros for commands not found on the screen elsewhere (So far I needed it for AF level, sidetone level, selecting LSB/USB and for ATU activation). I am a 100% CW opr, but never the less, why is it that there is no button, so i need to send a K3 command in order to select LSB or USB? It's a great new use of the iPhone! For the audio I use Skype which works OK, but it is not best suited for CW. 73 and again thanks for a nice piece of SW Mike Poul-Erik OZ4UN -Oprindelig meddelelse- Fra: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] På vegne af Bill Brooks Sendt: 7. oktober 2011 04:41 Til: Mike KS7D Cc: Reflector Emne: Re: [Elecraft] Remote Control of K3 with iPhone/iDevice Mike, Wow. Steve Jobs would have been proud. Just pointed out to the XYL I can sit in the den with the ballgame on, IPad in hand and work a little RTTY. This is just cool. Thanks, Mike. Bill, KE5OG On Mon, Oct 3, 2011 at 2:18 PM, Mike KS7D wrote: > Yes, adding streaming audio to the app is a goal down the road if > there is enough user interest in these apps. > > Mike, ks7d > EL87uu > Sent from my iPhone > > On Oct 3, 2011, at 1:17 PM, Wayne Burdick wrote: > > > Way cool, Mike! I'll be giving K3iConnect a try. > > > > Are you also looking at streaming audio directly through your app so > > that Airfoil is not needed? > > > > Wayne > > N6KR > > > > On Oct 3, 2011, at 8:49 AM, Michael Downs wrote: > > > >> I have two apps in the Apple App Store that allow you to remotely > >> control your K3 using your iPhone, iPad, or iPod Touch. These apps > >> are free as I want to encourage those who are interested to try > >> them out and provide me feedback on any bugs discovered and > >> enhancements desired. > >> > >> The apps use two different approaches to communicate with the K3 > >> from your iDevice. K3iConnect establishes an ad hoc network with a > >> wifi serial adapter that fits in the RS232 port on the K3. Thus, no > >> PC/Mac or cables are required and the K3 can be remotely controlled > >> from anywhere within 30+ feet of the radio. > >> > >> K3iNetwork uses your local WiFi network and PC/Mac to communicate > >> with the K3. In this case you need to have your K3 tethered to your > >> PC or Mac via an RS232 cable. The advantage here is that sound from > >> the K3 line out can be streamed to the iDevice with a third party > >> app such as Airfoil. > >> > >> Both apps will work with the P3. > >> > >> I have used these apps to carry on CW and data QSOs with other > >> amateurs. I think they are an exciting addition to the Elecraft > >> Mojo, but they also need the benefit of users ideas on how to make > >> them better. Also, maybe other iDevice or Android developers will > >> be inspired to develop their own apps to add even more capabilities. > >> > >> Enjoy! > >> > >> Mike, ks7d > > > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net Please help support this > > email list: http://www.qsl.net/donate.html > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Harmonics from K3
Hi Jack Thanks a lot for your valuable feed-back. Yes you are correct that there are some assumptions. The Spectrum Analyzer is very flat over the spectrum I have been checking - thats a fact. I assumed that a small piece of wire would be fairly omnidirectional - and thus have the same gain - on these low frequencies. I still think that is true, butI have however not taken into account that the short wire will have very different impedance on the fundamental and harmonic frequencies. This may be an important error source. Yes I am indeed in the near field of the antenna, and this may be a source of error too. This I can verify, because the Spectrum Analyzer may run on batteries and I can operate the K3 with my iPhone (or a small laptop) so I can easily measure in the far field. I need to think about how to make a proper measurement antenna though. I dont think pick-up directly from the K3 due to imperfect shielding is the cause, since it then also should be present on the measurements on the dummy load. But, al this said, I don't think it explains why the measurements are so markedly different on 14 MHz compared to the other bands. Thatr is my main worry. The question remains whether this is specific to my K3 or to something else locally. Poul-Erik OZ4UN -Oprindelig meddelelse- Fra: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] På vegne af Jack Smith Sendt: 27. oktober 2011 15:00 Til: Poul Erik Karlshøj (PKA) Cc: Elecraft@mailman.qth.net Emne: Re: [Elecraft] Harmonics from K3 Poul-Erik: You have an implicit assumption that the spectrum analyzer to transmit antenna has a flat response with respect to frequency. That's unlikely to be the case. Another assumption is that the spectrum analyzer antenna is in the "far field" of the antenna. This is also unlikely to be the case. And another is that the K3 itself does not radiate due to imperfect shielding which may be a problem when the pickup antenna is close to the K3. The normal method to measure harmonic suppression is to use either a power attenuator, such as 30 dB attenuation rated at 100 watts, so that the spectrum analyzer only detects signals from the transmitter. Or, if a suitable power attenuator is not available, a standard dummy load and a resistive "tap" or a directional coupler of known frequency characteristics can be used to obtain a low level signal sample that does not vary with frequency. With respect to measuring radiated harmonics, the most accurate method is to locate the measuring equipment sufficiently far from the transmit antenna such that the signal is far field. 10x the transmitting wavelength is a safe number, but a somewhat shorter distance may be OK. The spectrum analyzer or field strength meter uses an antenna with a known antenna factor at the fundamental frequency and all the harmonics so that the actual radiated field strength can be computed and from that the harmonic level. Since the transmitting antenna almost certainly has directional characteristics -- particularly at harmonic frequencies -- several sets of measurements should be made at varying azimuths from the transmitting antenna. So, to make these measurements accurately in the case of radiated harmonics is a non-trivial undertaking. Jack K8ZOA On 10/27/2011 7:52 AM, Poul Erik Karlshøj (PKA) wrote: > I have been measuring the level of harmonic spurious from my K3 #3674 and > came up with some interesting results. > > I measured with the K3 connected to a dummy load and to my antennas (loop for > 80-40-30 and 17m dipole for higher bands, both antennas fed by 450 ohm feeder > and Elecraft 4:1 baluns). Since I have one of the older baluns with just one > ferrite core and one with two cores, I measured on each antenna with each of > the baluns. > > In all measurements I used the K3 ATU and the SWR was "1 bar segment" > > I used a Rohde&Schwarz FSH8 portable Spectrum Analyzer using a short wire in > the input connector center pin to pick up the signal from the antennas. The > analyzer was in my shack, next to the rig. But since I also used the pick-up > antenna to measure the leaking signal from the dummy load (and the harmonics > were all very low) the higher level harmonics measured when connected to the > antenna supposedly did not come from stray signals in the shack. > > So, what did I see with K3 transmitting 100W? > 1,8 >38 dB > 3,5 37 > 7 >55 > 1043 > 1440 (2nd harm) > 1844 > 2153 > 2449 > 2859 > This seems pretty good to me. > > With K3 transmitting 100W and 2-core balun on loop (160-40) and 1-core balun > on dipole (20-10) > 1,8 38 dB > 3,5 40 > 7 55 > 1028 > 1416 (2nd harm), 3rd harm at 30 dB > 1829 > 2128 > 2428 > 2837 > Especially the 14 MHz value was a surprise, but generally much higher > harmonics on 30-10m than on the dummy load > > > With K3 transmitting 100W and 1-core balun on loop (160-40)
[Elecraft] FS :elecraft K2 with KPA100 and KAT100 in EC2
Complete Elecraft Radio Station including: Elecraft K2/ SN 5348 including KSB2, KNB2, KDSP2, K160m, KIO, K2BAT, K2ATU for use as a QRP station -- and-- the KPA100 and the KAT100 are in a separate EC2 case. So you can easily upgrade to 100W by connecting the K2 to the EC2 box including the 100W amp and the ATU for up to 150W. All manuals and some spare parts ( screws, potentiometers etc.) Kenwood MC43 Mic., cables. All Mods considered from QRP-Project. All kits built to the best standards. Shipping to EU INCLUDED . PRICE EURO 1300,-- Location is Germany Mails please direct to dc...@darc.de vy 73 dc0zo __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Harmonics from K3
Hello Poul-Erik, If your K3 is putting out 100 watts, it is very unlikely that it is generating the harmonics that you are measuring, especially in the case of the even harmonics. Your measured results may be due to some non-linear element in the near field such as a corroded or loose connection or the difference in path loss, antenna pattern and gain (loss) of both the loop and the your short probe on the spectrum analyzer. Also, it appears that the balun is a significant contributor as shown by the difference in measured results when using one balun verses the other. You can verify that the K3 is operating properly by connecting a suitable attenuator between the K3 and the spectrum analyzer and making a conducted harmonic measurement. If you do this, be careful that the signal level into the spectrum analyzer is low enough so that harmonics are not generated in the spectrum analyzer itself. The harmonics from the K3 will be in the range of -60dBc if operating normally. 73, Bob, N6CM On Thu, Oct 27, 2011 at 4:52 AM, Poul Erik Karlshøj (PKA) wrote: > I have been measuring the level of harmonic spurious from my K3 #3674 and > came up with some interesting results. > > I measured with the K3 connected to a dummy load and to my antennas (loop > for 80-40-30 and 17m dipole for higher bands, both antennas fed by 450 ohm > feeder and Elecraft 4:1 baluns). Since I have one of the older baluns with > just one ferrite core and one with two cores, I measured on each antenna > with each of the baluns. > > In all measurements I used the K3 ATU and the SWR was "1 bar segment" > > I used a Rohde&Schwarz FSH8 portable Spectrum Analyzer using a short wire > in the input connector center pin to pick up the signal from the antennas. > The analyzer was in my shack, next to the rig. But since I also used the > pick-up antenna to measure the leaking signal from the dummy load (and the > harmonics were all very low) the higher level harmonics measured when > connected to the antenna supposedly did not come from stray signals in the > shack. > > So, what did I see with K3 transmitting 100W? > 1,8 >38 dB > 3,5 37 > 7 >55 > 10 43 > 14 40 (2nd harm) > 18 44 > 21 53 > 24 49 > 28 59 > This seems pretty good to me. > > With K3 transmitting 100W and 2-core balun on loop (160-40) and 1-core > balun on dipole (20-10) > 1,8 38 dB > 3,5 40 > 7 55 > 10 28 > 14 16 (2nd harm), 3rd harm at 30 dB > 18 29 > 21 28 > 24 28 > 28 37 > Especially the 14 MHz value was a surprise, but generally much higher > harmonics on 30-10m than on the dummy load > > > With K3 transmitting 100W and 1-core balun on loop (160-40) and 2-core > balun on dipole (20-10) > 1,8 16 dB > 3,5 45 > 7 31 > 10 33 > 14 17 (2nd harm) > 18 35 > 21 45 > 24 36 > 28 42 > The 14 MHz value still pretty bad and the high bands much better now with > 2-core balun. Low bands some worse and some better with 1-core balun! > > Finally - assuming that some of the harmonics might origin from > non-linearities in the balun core - I measured on 14 MHz with the 2-core > balun at different power levels: > 14 MHz, 2-core balun and dipole antenna > 100W18 dB > 80 17 > 60 16 > 40 16 > 20 18 > 10 21 > 5 21 > It seems that the power value has very little influence on the harmonic > level, so my theory of harmonics being created in the balun may not be > correct. > When the ATU shows SWR ~1 does it mean that the current waveform in the PA > transistors are independent of whether the load is a dummy load (and the ATU > practically bypasses) or the load is a complex impedance requiring some L > and C to reach 50 ohms? > > Now I have the following questions: > 1) is my K3#3674 specifically having a problem concerning harmonics on 14 > MHz or would I measure the same on any other K3 > 2) what is the reason that I measure much higher harmonic levels when > connected to the antenna than on dummy load? > 3) when the ATU shows SWR ~1 does it mean that the current waveform in the > PA transistors is independent of whether the load is a dummy load (and the > ATU practically bypasses) or the load is a complex impedance requiring some > L and C to reach 50 ohms? > 4) have I overlooked some fundamental measurement error in using a small > piece (3 cm) of wire to pick up the RF signals? > > 73 de > Poul-Erik > OZ4UN > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elec
[Elecraft] (no subject)
If you don't get QRP ARCI's QRP Quarterly Magazine--You're really missing something special, a real treat!Thanks to Brian--KB9BVN, his staff and all to the excellent contributors.This is some of the best content ever! There's a lot of fun between these pages. Elecraft is well represented in this issue. (You might even find Eric--WA6HHQ in there . . . Twice! 72/73 & DX, Craig W. Behrens -- NM4T __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 "Tuning Noise"
Not sure I follow. Tapping my FINE button [which I can do with my finger while hand is on knob] toggles between 1Hz and 10Hz rates. Holding FINE makes it a 100Hz rate which takes me from one end of the band to the other at about half the velocity of light. I also discovered, thanks to KE7X's book, that I can change the basic rates in the menu. I fooled with it some, went back to the defaults. In fact, that's been my general observation ... the K3 is pretty well optimized right out of the box. You're in my log 16 times! Thanks for all the Q's. 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org On 10/27/2011 11:29 AM, Robby.VY2SS wrote: > Fred, > Don't look at the P3 when you are fast tuning the K3. > The K3 seems to require a lot more dial winding than any other rig I have > ever had. Not that I'm switching back to anything. I sure do miss triple > bandstacking registers. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 "Tuning Noise"
Note that the P3 only turns off averaging when tuning if it is in tracking mode. It doesn't happen in fixed-tune mode. Alan N1AL On Thu, 2011-10-27 at 11:28 -0700, Fred Jensen wrote: > Thanks, that's it! The higher I set the averaging, the more I see the > effect since the band noise on the baseline gets compressed with more > averaging. > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the 2012 Cal QSO Party 6-7 Oct 2012 > - www.cqp.org > > On 10/26/2011 5:41 PM, Grant Youngman wrote: > > What you see in the display when not tuning is the time-averaged > > noise (or signal), depending on how you have the averaging parameter > > set. When you're tuning rapidly the P3 can't average, so the level > > appears to rise. It's rising toward the actual peak noise level. > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Harmonics from K3
"I used a Rohde&Schwarz FSH8 portable Spectrum Analyzer using a short wire in the input connector center pin to pick up the signal from the antennas" Using such a wire pick up will exaggerate the higher frequencies and not give a flat response. You need to use a resistive tap or power attenuator in order to obtain the correct measurement. A -40 dB resistive tap can be easily built from the article in June 2001 QST. The article is called "Simple RF Power Measurement" by Wes Hayward and available from the ARRL members section of their web site. Measurements on my own K3 (serial 80) give the worst case harmonic as -53 dB on 80m and less than I can measure on 14 MHz. These measurements were on a factory calibrated analyser using a 50 Ohm load. 73 Dave __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 & MacLoggerDX connection
The Elecraft KUSB uses the FTDI chip set and works very well with the Mac using all recent OS versions. It works very well on Lion. Just go to the Elecraft web site to order yours! Jack Brindle, W6FB Elecraft Engineering On Oct 27, 2011, at 11:10 AM, Lew Phelps K6LMP wrote: > Yes, you need a USB-RS232 "dongle". And you have to be wary about > what brand you acquire. Many of the USB serial port adapters on the > market don't have drivers for Mac OS X, and many of the drivers that > purport to run under OS X OS X work with versions 10.6 and earlier, > but not 10.7 (Lion), which will be the OS version installed on your > MacBook if you got it recently. > > The problem is that 10.6 could run either 32 bit or 64 bit, but the > "upgrade" to 10.7 removed support for 32-bit drivers. (In fairness > to Apple, they had been warning for a long time that they would be > phasing out support for 32-bit drivers, although they didn't make it > very clear when they introduced 10.7 that this was The Time that > support for older drivers was going away.) > > I know for sure that the most current Keyspan driver for their > USA-19 HS product works with Lion, because that's what I use, and > their web site specifically says "works with Lion" > > I believe that any USB-RS232 converter that uses the FTDI chipset > also should work. There are quite a few different products on the > market that use the FTDI chipset, but good luck finding a store > clerk who knows for sure. FTDI has released a 645 bit driver > (which is what's needed for Lion). It's available at > > http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_2_16.dmg > > The Prolific chipset also allegedly has a 64-bit kernel and > therefore should run on 10.7, but Prolific's web site only > references 10.6, so I would be wary unless you can confirm from the > seller that it will run under 10.7 > > > Good luck and 73 > > Lew K6LMP > > > > On Oct 27, 2011, at 7:57 AM, Hunsdon Cary III wrote: > >> A big "Thank You" to the dozen or so who responded to my question >> about logging program recommendations for a MacBook; very much >> appreciated! >> I purchased MacLoggerDX yesterday and now am pondering how to >> connect the MacBook to the computer. I think I need an RS-232 to >> USB cable, is that correct? >> 73, >> Cary, K4TM >> K3-100 #3449 >> >> H. Cary III, K4TM >> h3c...@gmail.com >> >> >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 "Tuning Noise"
Fred, Don't look at the P3 when you are fast tuning the K3. The K3 seems to require a lot more dial winding than any other rig I have ever had. Not that I'm switching back to anything. I sure do miss triple bandstacking registers. -Robby VY2SS -- View this message in context: http://elecraft.365791.n2.nabble.com/P3-Tuning-Noise-tp6934706p6937518.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 "Tuning Noise"
Thanks, that's it! The higher I set the averaging, the more I see the effect since the band noise on the baseline gets compressed with more averaging. 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org On 10/26/2011 5:41 PM, Grant Youngman wrote: > What you see in the display when not tuning is the time-averaged > noise (or signal), depending on how you have the averaging parameter > set. When you're tuning rapidly the P3 can't average, so the level > appears to rise. It's rising toward the actual peak noise level. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Computerless RTTY/CW Keyboard for K3
Sounds great but how do you log it? -Robby VY2SS -- View this message in context: http://elecraft.365791.n2.nabble.com/Computerless-RTTY-CW-Keyboard-for-K3-tp6935007p6937492.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 - Choice of filters in KRX3
Stewart, I operate mostly in the CW mode and some RTTY. In my second RX I have a 400 hz 8 pole. My main RX has 8 pole 500hz and 250 hz filters not counting the SSB ones. I normaly listen with my width set at 350 and down to 200-250 in a contest. I can see no reason to have the same filters in both recievers even using diversity. I have never tried SO2V operating but I would be interested in hearing more about it since I seem to have the hardware for it. If you sell it, buy a P3 with the money. 73, -Robby VY2SS -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Choice-of-filters-in-KRX3-tp6932305p6937473.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 & MacLoggerDX connection
Yes, you need a USB-RS232 "dongle". And you have to be wary about what brand you acquire. Many of the USB serial port adapters on the market don't have drivers for Mac OS X, and many of the drivers that purport to run under OS X OS X work with versions 10.6 and earlier, but not 10.7 (Lion), which will be the OS version installed on your MacBook if you got it recently. The problem is that 10.6 could run either 32 bit or 64 bit, but the "upgrade" to 10.7 removed support for 32-bit drivers. (In fairness to Apple, they had been warning for a long time that they would be phasing out support for 32-bit drivers, although they didn't make it very clear when they introduced 10.7 that this was The Time that support for older drivers was going away.) I know for sure that the most current Keyspan driver for their USA-19 HS product works with Lion, because that's what I use, and their web site specifically says "works with Lion" I believe that any USB-RS232 converter that uses the FTDI chipset also should work. There are quite a few different products on the market that use the FTDI chipset, but good luck finding a store clerk who knows for sure. FTDI has released a 645 bit driver (which is what's needed for Lion). It's available at http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_2_16.dmg The Prolific chipset also allegedly has a 64-bit kernel and therefore should run on 10.7, but Prolific's web site only references 10.6, so I would be wary unless you can confirm from the seller that it will run under 10.7 Good luck and 73 Lew K6LMP On Oct 27, 2011, at 7:57 AM, Hunsdon Cary III wrote: > A big "Thank You" to the dozen or so who responded to my question about > logging program recommendations for a MacBook; very much appreciated! > I purchased MacLoggerDX yesterday and now am pondering how to connect the > MacBook to the computer. I think I need an RS-232 to USB cable, is that > correct? > 73, > Cary, K4TM > K3-100 #3449 > > H. Cary III, K4TM > h3c...@gmail.com > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Complete K2 Station For Sale
Complete Elecraft Radio Station including: Elecraft K2/100 SN6750 including KSB2, KNB2, KDSP2; KAT100-1 100W antenna tuner; W2 Wattmeter; 10W and 100W dummy loads; N3ZN Z9-N key; Heil Headset/Mic. All kits built to the best standards including Torroids from AA3WF (recommended by Elecraft). No on air time. All testing and calibration was done as required during construction. All of the items are fresh and in pristine condition. I enjoyed the build and testing but circumstances force me to sell out the entire package. The total value of the package is approximately $2800 (based on kit prices). I am asking $2200 for the entire package shipped within CONUSA. I will consider breaking up the package. Please ask questions and thank you for looking -- View this message in context: http://elecraft.365791.n2.nabble.com/Complete-K2-Station-For-Sale-tp6937028p6937028.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 & MacLoggerDX connection
Do you mean "...connecting the MacBook to the K3" ? If so, yes you need RS232 to USB adapter cable. And likely a driver for the Mac. PEH's iPhone On Oct 27, 2011, at 7:57 AM, Hunsdon Cary III wrote: > A big "Thank You" to the dozen or so who responded to my question about > logging program recommendations for a MacBook; very much appreciated! > I purchased MacLoggerDX yesterday and now am pondering how to connect the > MacBook to the computer. I think I need an RS-232 to USB cable, is that > correct? > 73, > Cary, K4TM > K3-100 #3449 > > H. Cary III, K4TM > h3c...@gmail.com > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 & MacLoggerDX connection
A big "Thank You" to the dozen or so who responded to my question about logging program recommendations for a MacBook; very much appreciated! I purchased MacLoggerDX yesterday and now am pondering how to connect the MacBook to the computer. I think I need an RS-232 to USB cable, is that correct? 73, Cary, K4TM K3-100 #3449 H. Cary III, K4TM h3c...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] N2CQ QRP Contest Calendar: November 2011
~ N2CQ QRP CONTEST CALENDAR November 2011 ~ CQ WW DX Contest (SSB) ... QRP Category Oct 29, z to Oct 30, 2359z Rules: http://www.cqww.com/rules.php ~ Ten-Ten Fall QSO Party (Digital) ... QRP Category Oct 29, 0001z to Oct 30, 2359z Rules: http://www.ten-ten.org/Forms/QSOPartyRules_082710.pdf ~ UBA Foxhunt (CW/PSK31/SSB) *** QRP Contest *** Oct 31, 1930z to 2030z Rules: http://www.on5ex.be/foxhunt/foxhunt.html ~ HA-QRP Contest (CW - 80 Meters) *** QRP Contest*** Nov 1, z to Nov 7, 2400z Rules: http://www.radiovilag.hu/haqrp2.htm ~ Ukrainian DX Contest (CW/SSB) ... QRP Category Nov 5, 1200z to Nov 6, 1200z Rules: http://www.ucc.zp.ua/ ~ ARRL Sweepstakes (CW) ... QRP Category Nov 5, 2100z to Nov 7, 0259z Rules: http://www.arrl.org/sweepstakes ~ NA Collegiate ARC Championship (CW) .. QRP Category Nov 5, 2100z to Nov 7, 0259z Rules: http://www.collegiatechampionship.org/rules/ ~ Daylight Savings Time Ends Nov 6, 0200 AM ~ High Speed Club Contest (CW) ... QRP Category Nov 6, 0900z to 1100z and 1500z to 1700z Rules: http://www.highspeedclub.org/ ~ UBA Foxhunt (CW/PSK31/SSB) *** QRP Contest *** Nov 7, 1930z to 2030z Rules: http://www.on5ex.be/foxhunt/foxhunt.html ~ Adventure Radio Spartan Sprint (CW) *** QRP Event! *** Nov 8, 0100z to 0300z (First Monday 9 PM EDT) Rules: http://adventure-radio.org/wiki/index.php?title=Spartan_Sprints ~ 80 METER FOXHUNT (CW) *** QRP Contest *** Nov 9, 0200z to 0329z Info: http://www.qrpfoxhunt.org/ ~ CWops Mini-CWT Test (CW) ... QRP Category Nov 9, 1300z to 1400z and Nov 9, 1900z to 2000z and Nov 10, 0300z to 0400z Rules: http://www.cwops.org/onair.html ~ 40 METER FOXHUNT (CW) *** QRP Contest *** Nov 11, 0200z to 0329z Info: http://www.qrpfoxhunt.org/ ~ WAE RTTY Contest ... 100W Category Nov 12, z to Nov 13, 2359z Rules: http://www.darc.de/referate/dx/contest/waedc/en/rules/ ~ Japan International DX Contest (phone)... 100w category Nov 12, 0700z to Nov 13, 1300z Rules: http://jidx.org/jidxrule-e.html ~ OK/OM DX Contest (CW) ... QRP Category! Nov 12, 1200z to Nov 13, 1200z Rules: http://okomdx.crk.cz/g.html ~ CWops Mini-CWT Test (CW) ... QRP Category Nov 12, 1300z to 1400z and Nov 12, 1900z to 2000z and Nov 13, 0300z to 0400z Rules: http://www.cwops.org/onair.html ~ Kentucky QSO Party (CW/Ph) Nov 12, 1400z to Nov 13, 0200z Rules: http://www.wkdxa.com ~ SKCC Weekend Sprintathon (Straight Key CW) ... QRP Category Nov 13, z to 2359z Rules: http://www.skccgroup.com/sprint/wes/index-wes.html ~ NAQCC-EU Monthly Sprint (CW) *** QRP Contest *** Nov 14, 1800z to 2000z Rules: http://naqcc-eu.org/sprints UBA Foxhunt (CW/PSK31/SSB) *** QRP Contest *** Nov 14, 1930z to 2030z Rules: http://www.on5ex.be/foxhunt/foxhunt.html ~ 80 METER FOXHUNT (CW) *** QRP Contest *** Nov 16, 0200z to 0329z Info: http://www.qrpfoxhunt.org/ ~ NAQCC Straight Key/Bug Sprint *** QRP CONTEST! *** EST: Nov 16, 8:30 PM to 10:30 PM UTC: Nov 17, 0130z to 0330z Rules: http://naqcc.info/contests.html ~ 40 METER FOXHUNT (CW) *** QRP Contest *** Nov 18, 0200z to 0329z Info: http://www.qrpfoxhunt.org/ ~ LZ DX CONTEST (CW/SSB) ... QRP Category Nov 19, 1200z to Nov 20, 1200z Rules: http://lzdx.bfra.org/rulesen.html ~ Feld Hell Club Sprint (Feld Hell) ... QRP Category Nov 19, 1600z to 1800z Rules: http://sites.google.com/site/feldhellclub/Home
[Elecraft] Mating Yaesu DTMF mic to K3
In addition to my K3, I own a Yaesu FT-7800 mobile FM rig,which I have equipped with Yaesu's MH-48 DTMF microphone. I'm considering building a simple adapter that would allow me to connect the MH-48 to the front panel mike jack, which would allow me to use the keypad on the mic to access remote nodes on repeater networks, using the DTMF keys on the MH-48 mic. The connections are straightforward. However, I do have a question to which I need an answer before I proceed: The Elecraft manual states that Pin 6 of the front panel mic jack provides +8 VDC (which is the voltage required by the MH-48), but with a maximum draw of 10 ma. I am unable to find any reference online that states the maximum current draw of the MH-48. Given that the mike unit contains nine transistors connected to the 5 x 4 keypad matrtix (two of which will draw current with the pressing of any DTMF key) plus a couple of keypad-illuminating LEDs and a "transmit" LED. I'm concerned that the mic will draw more current than the K3 mic jack is engineered to supply, particularly given that an LED typically draws 20 ma or so. Does anyone know what the power requirement is for the MH-48? Even if I turn off the keypad backlights, will it stay under 10 ma? Or, to put it all more simply, has anyone tried mating the MH-48 to the K3, and succeeded? One alternative, of course, is to build a small power supply into the interface box; input 12VDC, output 8 VDC to the mic, ignoring the input from Pin 6 of the mic jack. Unless I can definitively establish that the mic draws less than 10 ma, I expect to follow this route. All of which leads to a "feature request" for the K3: could we make the keypad useable as a DTMF generator (turned on with press of some key, of course). 73 Lew K6LMP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Computerless RTTY/CW Keyboard for K3
I posted a similar RTTY P3 copy suggestion last Saturday, the 22nd. Look for Subject: "Text Decode on P3 screen?" Which was a re-post of the same question earlier in the year. John, KN5L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Wanted & FS
Interested in a 200 and/or 250Hz filter for the K3... Looking for a box (aluminum, high impact plastic, stainless) or cover that can have a plate attached in the 11.5" by 7.5" range (slightly bigger OK) minimum 3" deep, weather proof or resistant for a project. Please advise shipped price for above items... Have a Moseley Classic 36 (no shipping, but may be able to meet within a reasonable distance) available, asking $450. 73, Julius n2wn - Julius Fazekas N2WN Tennessee Contest Group http://www.k4ro.net/tcg/index.html Tennessee QSO Party http://www.tnqp.org/ Elecraft K2#4455 Elecraft K3/100 #366 Elecraft K3/100 -- View this message in context: http://elecraft.365791.n2.nabble.com/Wanted-FS-tp6936257p6936257.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Harmonics from K3
Poul-Erik: You have an implicit assumption that the spectrum analyzer to transmit antenna has a flat response with respect to frequency. That's unlikely to be the case. Another assumption is that the spectrum analyzer antenna is in the "far field" of the antenna. This is also unlikely to be the case. And another is that the K3 itself does not radiate due to imperfect shielding which may be a problem when the pickup antenna is close to the K3. The normal method to measure harmonic suppression is to use either a power attenuator, such as 30 dB attenuation rated at 100 watts, so that the spectrum analyzer only detects signals from the transmitter. Or, if a suitable power attenuator is not available, a standard dummy load and a resistive "tap" or a directional coupler of known frequency characteristics can be used to obtain a low level signal sample that does not vary with frequency. With respect to measuring radiated harmonics, the most accurate method is to locate the measuring equipment sufficiently far from the transmit antenna such that the signal is far field. 10x the transmitting wavelength is a safe number, but a somewhat shorter distance may be OK. The spectrum analyzer or field strength meter uses an antenna with a known antenna factor at the fundamental frequency and all the harmonics so that the actual radiated field strength can be computed and from that the harmonic level. Since the transmitting antenna almost certainly has directional characteristics -- particularly at harmonic frequencies -- several sets of measurements should be made at varying azimuths from the transmitting antenna. So, to make these measurements accurately in the case of radiated harmonics is a non-trivial undertaking. Jack K8ZOA On 10/27/2011 7:52 AM, Poul Erik Karlshøj (PKA) wrote: > I have been measuring the level of harmonic spurious from my K3 #3674 and > came up with some interesting results. > > I measured with the K3 connected to a dummy load and to my antennas (loop for > 80-40-30 and 17m dipole for higher bands, both antennas fed by 450 ohm feeder > and Elecraft 4:1 baluns). Since I have one of the older baluns with just one > ferrite core and one with two cores, I measured on each antenna with each of > the baluns. > > In all measurements I used the K3 ATU and the SWR was "1 bar segment" > > I used a Rohde&Schwarz FSH8 portable Spectrum Analyzer using a short wire in > the input connector center pin to pick up the signal from the antennas. The > analyzer was in my shack, next to the rig. But since I also used the pick-up > antenna to measure the leaking signal from the dummy load (and the harmonics > were all very low) the higher level harmonics measured when connected to the > antenna supposedly did not come from stray signals in the shack. > > So, what did I see with K3 transmitting 100W? > 1,8 >38 dB > 3,5 37 > 7 >55 > 1043 > 1440 (2nd harm) > 1844 > 2153 > 2449 > 2859 > This seems pretty good to me. > > With K3 transmitting 100W and 2-core balun on loop (160-40) and 1-core balun > on dipole (20-10) > 1,8 38 dB > 3,5 40 > 7 55 > 1028 > 1416 (2nd harm), 3rd harm at 30 dB > 1829 > 2128 > 2428 > 2837 > Especially the 14 MHz value was a surprise, but generally much higher > harmonics on 30-10m than on the dummy load > > > With K3 transmitting 100W and 1-core balun on loop (160-40) and 2-core balun > on dipole (20-10) > 1,8 16 dB > 3,5 45 > 7 31 > 1033 > 1417 (2nd harm) > 1835 > 2145 > 2436 > 2842 > The 14 MHz value still pretty bad and the high bands much better now with > 2-core balun. Low bands some worse and some better with 1-core balun! > > Finally - assuming that some of the harmonics might origin from > non-linearities in the balun core - I measured on 14 MHz with the 2-core > balun at different power levels: > 14 MHz, 2-core balun and dipole antenna > 100W 18 dB > 8017 > 6016 > 4016 > 2018 > 1021 > 5 21 > It seems that the power value has very little influence on the harmonic > level, so my theory of harmonics being created in the balun may not be > correct. > When the ATU shows SWR ~1 does it mean that the current waveform in the PA > transistors are independent of whether the load is a dummy load (and the ATU > practically bypasses) or the load is a complex impedance requiring some L and > C to reach 50 ohms? > > Now I have the following questions: > 1) is my K3#3674 specifically having a problem concerning harmonics on 14 MHz > or would I measure the same on any other K3 > 2) what is the reason that I measure much higher harmonic levels when > connected to the antenna than on dummy load? > 3) when the ATU shows SWR ~1 does it mean that the current waveform in the PA > transistors is independent of whether the load is a dummy load (and the ATU > practically bypasses) or the load is a complex impedance requiring some L and > C to
Re: [Elecraft] Computerless RTTY/CW Keyboard for K3
Another option forking simply working DXpeditions on RTTY is programming the memories. I have my call x 3 in one memory and TU 599 DE W2UP in another. Barry W2UP -- View this message in context: http://elecraft.365791.n2.nabble.com/Computerless-RTTY-CW-Keyboard-for-K3-tp6935007p6936109.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Harmonics from K3
I have been measuring the level of harmonic spurious from my K3 #3674 and came up with some interesting results. I measured with the K3 connected to a dummy load and to my antennas (loop for 80-40-30 and 17m dipole for higher bands, both antennas fed by 450 ohm feeder and Elecraft 4:1 baluns). Since I have one of the older baluns with just one ferrite core and one with two cores, I measured on each antenna with each of the baluns. In all measurements I used the K3 ATU and the SWR was "1 bar segment" I used a Rohde&Schwarz FSH8 portable Spectrum Analyzer using a short wire in the input connector center pin to pick up the signal from the antennas. The analyzer was in my shack, next to the rig. But since I also used the pick-up antenna to measure the leaking signal from the dummy load (and the harmonics were all very low) the higher level harmonics measured when connected to the antenna supposedly did not come from stray signals in the shack. So, what did I see with K3 transmitting 100W? 1,8 >38 dB 3,5 37 7 >55 10 43 14 40 (2nd harm) 18 44 21 53 24 49 28 59 This seems pretty good to me. With K3 transmitting 100W and 2-core balun on loop (160-40) and 1-core balun on dipole (20-10) 1,8 38 dB 3,5 40 7 55 10 28 14 16 (2nd harm), 3rd harm at 30 dB 18 29 21 28 24 28 28 37 Especially the 14 MHz value was a surprise, but generally much higher harmonics on 30-10m than on the dummy load With K3 transmitting 100W and 1-core balun on loop (160-40) and 2-core balun on dipole (20-10) 1,8 16 dB 3,5 45 7 31 10 33 14 17 (2nd harm) 18 35 21 45 24 36 28 42 The 14 MHz value still pretty bad and the high bands much better now with 2-core balun. Low bands some worse and some better with 1-core balun! Finally - assuming that some of the harmonics might origin from non-linearities in the balun core - I measured on 14 MHz with the 2-core balun at different power levels: 14 MHz, 2-core balun and dipole antenna 100W18 dB 80 17 60 16 40 16 20 18 10 21 5 21 It seems that the power value has very little influence on the harmonic level, so my theory of harmonics being created in the balun may not be correct. When the ATU shows SWR ~1 does it mean that the current waveform in the PA transistors are independent of whether the load is a dummy load (and the ATU practically bypasses) or the load is a complex impedance requiring some L and C to reach 50 ohms? Now I have the following questions: 1) is my K3#3674 specifically having a problem concerning harmonics on 14 MHz or would I measure the same on any other K3 2) what is the reason that I measure much higher harmonic levels when connected to the antenna than on dummy load? 3) when the ATU shows SWR ~1 does it mean that the current waveform in the PA transistors is independent of whether the load is a dummy load (and the ATU practically bypasses) or the load is a complex impedance requiring some L and C to reach 50 ohms? 4) have I overlooked some fundamental measurement error in using a small piece (3 cm) of wire to pick up the RF signals? 73 de Poul-Erik OZ4UN __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 - Allocating macros
Should have been a bit more thorough here 'cos I've just found a post from Rich VE3KI from earlier in the year which goes a way to explaining. Seems you can store in both Hold and Tap but if there's only one macro in an M key (tap or hold) then it's run by just tapping. This is neat as I've now got my macro to switch between the sub rx audio mix A-Ab <-> Ab-Ab on one M key; it's now a quasi toggle action to swap by either Holding or Tappingand leaves the others for the 3 voice messages I'll need for this weekend's play in cqww. Still wondering about the Bank 1/2 thing though 73, Stewart, GW0ETF GW0ETF wrote: > > Been using macros for a long time but only just noticed the > following.. > > When allocating a stored macro to one of the M* keys it appears to give me > the choice of Tap or Hold (eg 'M4H Set'). This would allow 8 to be stored > in M1-M4. However when stored in either Tap or Hold the macro is run > whether the key is tapped or held, no difference. > > The stored macro also ignores Bank 1/2 selection ie written to both. Is > this the way it's supposed to happen? > > 73, > > Stewart, GW0ETF > -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Allocating-macros-tp6935743p6935805.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 - Allocating macros
Been using macros for a long time but only just noticed the following.. When allocating a stored macro to one of the M* keys it appears to give me the choice of Tap or Hold (eg 'M4H Set'). This would allow 8 to be stored in M1-M4. However when stored in either Tap or Hold the macro is run whether the key is tapped or held, no difference. The stored macro also ignores Bank 1/2 selection ie written to both. Is this the way it's supposed to happen? 73, Stewart, GW0ETF -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Allocating-macros-tp6935743p6935743.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] noisy noise
I too suffer from some severe local noise, of several varieties, which comes and goes depending on time of day, day of week etc. So I picked up a DX Engineering NCC-1 here and am happy with it. It's well made and the control knobs are *big* and very smooth, a pleasure to operate. It integrates nicely with the K3, inserted between the K3 antenna OUT and antenna IN jacks. I have a horizontal trap dipole which I use as the RX antenna on the K3 when I need to fight noise. A vertical doublet antenna or inverted L is used as the transmit antenna, but I also use these as the noise sense antennas when the NCC-1 is in-line. To do this, the horizontal antenna goes to antenna port A on the NCC-1 (receive antenna input), K3 antenna OUT (from the transmit antenna) goes to antenna port B on the NCC-1 (noise antenna input) and the output of the NCC-1 goes to the K3 antenna IN. Now I have 3 choices: If I then select the RX antenna on the K3, the NCC-1 is inserted and I use the horizontal antenna for receive. If I don't select the RX antenna on the K3, the NCC-1 is bypassed, and the transmit antenna is used for receive. If I select the RX antenna on the K3, but turn the NCC-1 OFF, then I receive on the horizontal antenna, but the signal passes straight through the NCC-1 from antenna port A to the output without modification (for some local noise that's all that's needed). K3 KEY OUT goes to NCC-1 T/R CTRL to put it in bypass mode when the K3 is keyed. Cancellation of local noise seems to work well with this setup, using a full size vertical as the noise sense antenna, and the horizontal antenna as the receive antenna. The NCC-1 can provide a very deep null on the horizontal antenna for vertically polarized noise which is "heard" better on the vertical. The trick is to correctly balance the levels of the two antenna inputs on the NCC-1. The balance and phase controls are very precise and repeatable, and the phase control has great range. Having the P3 to look at helps in identifying the noise and finding what can be a rather sharp null. So far, the noise canceller has proven helpful in dealing with many (but not all) local noise problems and I'm glad I have it when I need it. Of course no two stations are identical. An alternate setup might involve a separate noise antenna (usually vertical) on NCC-1 antenna port B, with K3 antenna OUT going to NCC-1 antenna port A. In this case the K3 transmit antenna is used for receive at all times, but the NCC-1 is bypassed if the RX antenna is not selected on the K3. Another might involve dedicated noise and receive antennas, with the NCC-1 output connected to the K3 antenna IN. The NCC-1 is designed to work with the various active antennas offered by DX Engineering, one of which might make a good noise sense antenna. Bob NW8L >Guys >I am being hammered by what I believe are switching power supplys from >the local hospital >although it could be from a neighbor as it doesnt show any directivity on >my rcv loop >are there any suggestions on a good noise canceler ?? I have a anc >product which isnt always >effective and wondered if the DX eng. unit may be better,, I believe it >will rotate / control the phase 360 # >it is a lot more expensive >anybody have any expierence with any of the noise cancelers ?? >Bob K3DJC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
