[Elecraft] Can I measure antenna impedance with K2?
Hi:I have a K2 QRP rig with a built-in ATU. Are there any suggestions on how I could use the K2 to estimate the input impedance of my antenna, or at least see if it is in resonance?Sure enough, I can simply make the ATU find its best match, but I would like to know if the antenna itself actually was close to resonance or even estimate its input impedance, as measured at the K2 antenna connector. Can I measure the antenna SWR and bypass the ATU while I am doing that, to get at least an idea?73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure-antenna-impedance-with-K2-tp7591798.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 Message delivered to arch...@mail-archive.com
[Elecraft] Can I measure antenna impedance with K2?
You can measure the SWR by using KAT2. The details are given on page 19 of the KAT2 manual. 73 Johnny VR2XMC 寄件人︰ TF3KX kristi...@gmail.com 收件人︰ elecraft@mailman.qth.net 傳送日期︰ 2014年07月31日 (週四) 2:26 PM 主題︰ [Elecraft] Can I measure antenna impedance with K2? Hi:I have a K2 QRP rig with a built-in ATU. Are there any suggestions on how I could use the K2 to estimate the input impedance of my antenna, or at least see if it is in resonance?Sure enough, I can simply make the ATU find its best match, but I would like to know if the antenna itself actually was close to resonance or even estimate its input impedance, as measured at the K2 antenna connector. Can I measure the antenna SWR and bypass the ATU while I am doing that, to get at least an idea?73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure-antenna-impedance-with-K2-tp7591798.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 Message delivered to vr2...@yahoo.com.hk __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] A nice add on to keep my KX3 cool hyper link correction
For those of you who own a KX3 and are a digi op such as myself a great product I had ordered and installed on my KX3 is the Cooler KX heat-sink. VE7FMN produces a product with the fit and finish as if it came right from Elecraft. You can see more about this product on my blog http://ve3wdm.blogspot.ca/2014/07/cooler-kx-plus-heat-sink.html Mike VE3WDM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Kristinn, After doing a TUNE that hopefully ends up with a low SWR, you can look at the ATU menu parameters for Lxx.x, Cxx.x and NET x to determine the configuration of the L network that the ATU found for the match. You can then solve the L network equations to find the impedance of the end of your feedline in the shack. See page 21 in the KAT2 manual. 73, Don W3FPR On 7/31/2014 2:26 AM, TF3KX wrote: Hi:I have a K2 QRP rig with a built-in ATU. Are there any suggestions on how I could use the K2 to estimate the input impedance of my antenna, or at least see if it is in resonance?Sure enough, I can simply make the ATU find its best match, but I would like to know if the antenna itself actually was close to resonance or even estimate its input impedance, as measured at the K2 antenna connector. Can I measure the antenna SWR and bypass the ATU while I am doing that, to get at least an idea?73 - Kristinn, TF3KX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Small Portable Speaker
These are also available on amazon. I bought one there and I'm happy to confirm that it does work well with the KX3. 73, Doug -- K0DXV On 7/30/2014 10:07 PM, Reed wrote: Looking for a very small speaker that has bass, treble, volume controls I came across this one at Radio Shack, but are sold else where. Can run off 3 AA internal batteries or USB. I have used the little speaker for 3 months and been amazed how good it sounds. Description says stereo, but it only has one speaker with a good size magnet. The phone plug is stereo. Sounds great on the KX3 number of other rigs I use from time to time. For those, like me, that don't hear all the audio frequency this helps a lot. Also has plenty of volume. http://www.radioshack.com/product/index.jsp?productId=13040713 73, Reed Fite W4JZ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k0...@aol.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Thanks. Yes, I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. It would be neat if the K2 had enough CPU power and memory to carry these calculations out for me and just display the R+jX. Perhaps a good project for a small program or an app... 73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure-antenna-impedance-with-K2-tp7591798p7591803.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 Message delivered to arch...@mail-archive.com
[Elecraft] K3/0 Mini FSK RTTY Setup Info
It took me some time to get FSK RTTY working properly with the K3/0 Mini and the Remote Rig interface. Getting it to work smoothly with Writelog was especially challenging so I decided to write up my settings and connections and pass that info along to others who might be having as much difficulty as I did. I also use MMTTY standalone, N1MM, and the Remote Ham Radio service, so I included those details as well. I have posted the article in PDF format here: http://n6ee.net84.net/Articles/K3_0MiniCompleteSetuptoworkFSKRTTYwithWritelogetal.pdf I hope you find this information useful. Let me know if you have trouble accessing it. GL and 73, Ron N6EE __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. However, if you want to know the impedance of your antenna, you need to realise that the feedline is acting as an impedance transformer, and you need to take into account factors such as length of feedline, frequency of operation characteristic impedance and velocity factor of the feedline, etc.. 73, Matt VK2RQ On 1 Aug 2014, at 1:02 am, TF3KX kristi...@gmail.com wrote: Thanks. Yes, I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. It would be neat if the K2 had enough CPU power and memory to carry these calculations out for me and just display the R+jX. Perhaps a good project for a small program or an app... 73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure-antenna-impedance-with-K2-tp7591798p7591803.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 Message delivered to matt.vk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
There is a program, SmithSmith http://www.ae6ty.com/Smith_Charts.html which can also solve the impedance at the antenna. Set the ATU L and C and the coax feed-line as constants then adjust the antenna parameters for 1:1 SWR at the input. John KN5L On 07/31/2014 10:02 AM, TF3KX wrote: I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
The program is SimSmith (simple typo) and I agree with John that it is a very useful one. I have used several other implementations of Smith Charts and this one is by far my favorite. Fairly frequent updates, and a yahoo group for support. Eric KE6US On 7/31/2014 1:05 PM, John Oppenheimer wrote: There is a program, SmithSmith http://www.ae6ty.com/Smith_Charts.html which can also solve the impedance at the antenna. Set the ATU L and C and the coax feed-line as constants then adjust the antenna parameters for 1:1 SWR at the input. John KN5L On 07/31/2014 10:02 AM, TF3KX wrote: I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to eric_c...@hotmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Hi Matt, Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. I wonder if this is correct IMO, the task of the tuner is to make the tx happy, so it can look into the load it is designed for. Thus, it will translate the impedance as seen from the antenna connector into something as close to 50 ohm as possible. The tuner will not change anything on the feeder. With or without the tuner, the feeder will have the same VSWR. Per-Tore / LA7NO On 31 July 2014 22:02, Matt VK2RQ matt.vk...@gmail.com wrote: Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. However, if you want to know the impedance of your antenna, you need to realise that the feedline is acting as an impedance transformer, and you need to take into account factors such as length of feedline, frequency of operation characteristic impedance and velocity factor of the feedline, etc.. 73, Matt VK2RQ On 1 Aug 2014, at 1:02 am, TF3KX kristi...@gmail.com wrote: Thanks. Yes, I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. It would be neat if the K2 had enough CPU power and memory to carry these calculations out for me and just display the R+jX. Perhaps a good project for a small program or an app... 73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure-antenna-impedance-with-K2-tp7591798p7591803.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 Message delivered to matt.vk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to p...@ieee.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Per-Tore, Yes it is correct. He stated that it is the impedance at the rig end of the feedline. That will not likely be the feedpoint impedance of the antenna. That impedance can be found if you do the calculations for the impedance transformation of the feedline (for which the length of the feedline must be known). 73, Don W3FPR On 7/31/2014 4:23 PM, Per-Tore Aasestrand wrote: Hi Matt, Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. I wonder if this is correct IMO, the task of the tuner is to make the tx happy, so it can look into the load it is designed for. Thus, it will translate the impedance as seen from the antenna connector into something as close to 50 ohm as possible. The tuner will not change anything on the feeder. With or without the tuner, the feeder will have the same VSWR. Per-Tore / LA7NO On 31 July 2014 22:02, Matt VK2RQ matt.vk...@gmail.com wrote: Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. However, if you want to know the impedance of your antenna, you need to realise that the feedline is acting as an impedance transformer, and you need to take into account factors such as length of feedline, frequency of operation characteristic impedance and velocity factor of the feedline, etc.. 73, Matt VK2RQ On 1 Aug 2014, at 1:02 am, TF3KX kristi...@gmail.com wrote: Thanks. Yes, I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. It would be neat if the K2 had enough CPU power and memory to carry these calculations out for me and just display the R+jX. Perhaps a good project for a small program or an app... 73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure-antenna-impedance-with-K2-tp7591798p7591803.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 Message delivered to matt.vk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to p...@ieee.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Auto Notch Revisited.
It's been 2 years since there were complaints on this forum about the K3 auto-notch. Apparently it was never fixed. The other day I was working a Ham in Tel Aviv when a carrier came on and covered his signal. The Auto notch worked well but the guys voice was very distorted. To me that's unacceptable. This year at the Dayton Hamvention I talked to someone from Elecraft about the DSP problems and he agreed that the auto notch needs some improvement. I think he was a the product manager. Back in the early 90's I worked with another Engineer on a project we called The Hamblaster. I published two articles in QEX (October 1991 and January 1992). We developed a PC based sound card that connects to the receiver's audio and performed, among other things, an auto-notch and noise reduction (NR). In our DSP software, the auto-notch was generated by summing the inverted NR output to the input signal. Whether it's a noise reduction or an auto-notch we still used a software algorithm called the LMS (Least Means Square). Most Ham transceiver use the same LMS algorithm and I never heard distorted audio when the notch was engaged. That's especially true with Yaesu, Icom or Kenwood. I'm not sure about the other American brands but I bet they are OK as well. My second complaint is the K3's NR control. Most other manufacturers have an analog like control that simply changes the NR level. I don't understand the logic of having several steps from F1-1 to F4-4 and F5-1 (mixed) to F8-4 (mixed). I would rather have two separate settings. F0 to F9 for the level and if you want a to fiddle with the delay, D0 to D9 in the main menu. I think the level control on other radios is simply a mix of the input signal with the NR output and is similar to the K3's mF5-1 to mF8-4 To me it sounds as if there's a dynamic range problem on the K3 whereby the numbers in the math are over-ranging when the notch is engaged and is causing a flat-topping in the audio signal. But that's just a guess! I hope someone at Elecraft reads this and gets the ball rolling to fix the problem! Jack WA9FVP Willco Electronics rep...@willcoele.com - Jack WA9FVP Sent from my TRS-80 :-) -- View this message in context: http://elecraft.365791.n2.nabble.com/Auto-Notch-Revisited-tp7591810.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Auto Notch Revisited.
I completely agree - the K3 is very lacking with their auto-notch. It requires fiddling with the AGC menus to force it to function without ruining the fidelity of a SSB signal. The NR system is very complex with many settings - none of which I have found to be very helpful - certainly no better than just using my ears. The subject has been brought up several times since I became interested in the K3 and started following the various reflectors and groups. They are both weak points of the K3 and should be addressed. Most other currently available rigs are easier to operate in the NR arena and much more pleasing to listen to in the auto-notch arena. I have found some work-arounds and mentioned them in previous posts. That said, why are work-arounds needed??? Bill W2BLC K-Line __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Hi Don, I still doubt that this is correct. The L/C values given by the tuner, are the values as seen from the tx side. It is the values that will make the tx happy. It does not say much about the impedance at the rig end of the feeder. In order to change the VSWR on the feeder itself, one has to put the matching network (tuner) between the antenna and the feeder. BTW, the tx is probably not conjugate matched by the tuner. Conjugate matching does not apply to transmitters or power amplifiers. But I realize there is a huge dissension in this area too. ;-) Per-Tore / LA7NO On 31 July 2014 22:42, Don Wilhelm w3...@embarqmail.com wrote: Per-Tore, Yes it is correct. He stated that it is the impedance at the rig end of the feedline. That will not likely be the feedpoint impedance of the antenna. That impedance can be found if you do the calculations for the impedance transformation of the feedline (for which the length of the feedline must be known). 73, Don W3FPR On 7/31/2014 4:23 PM, Per-Tore Aasestrand wrote: Hi Matt, Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. I wonder if this is correct IMO, the task of the tuner is to make the tx happy, so it can look into the load it is designed for. Thus, it will translate the impedance as seen from the antenna connector into something as close to 50 ohm as possible. The tuner will not change anything on the feeder. With or without the tuner, the feeder will have the same VSWR. Per-Tore / LA7NO On 31 July 2014 22:02, Matt VK2RQ matt.vk...@gmail.com wrote: Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. However, if you want to know the impedance of your antenna, you need to realise that the feedline is acting as an impedance transformer, and you need to take into account factors such as length of feedline, frequency of operation characteristic impedance and velocity factor of the feedline, etc.. 73, Matt VK2RQ On 1 Aug 2014, at 1:02 am, TF3KX kristi...@gmail.com wrote: Thanks. Yes, I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. It would be neat if the K2 had enough CPU power and memory to carry these calculations out for me and just display the R+jX. Perhaps a good project for a small program or an app... 73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure- antenna-impedance-with-K2-tp7591798p7591803.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 Message delivered to matt.vk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to p...@ieee.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Auto Notch Revisited.
I agree with the majority of your assessment. I also brought up the Auto notch issue several years ago and haven't seen much, if any improvement. As a result, I nearly always just use manual notch. I also have the same complaint with the way the NR in the K3 works. The KX3 implementation is far superior, IMO. I've actually considered coupling an AF DSP speaker product from West Mountain Radio to the K3 to overcome the K3 autonotch and NR limitations. I've used one of their speakers mobile for many years coupled with my IC-7000 with a lot of success. On Thu, Jul 31, 2014 at 2:01 PM, wa9fvp rep...@willcoele.com wrote: It's been 2 years since there were complaints on this forum about the K3 auto-notch. Apparently it was never fixed. The other day I was working a Ham in Tel Aviv when a carrier came on and covered his signal. The Auto notch worked well but the guys voice was very distorted. To me that's unacceptable. This year at the Dayton Hamvention I talked to someone from Elecraft about the DSP problems and he agreed that the auto notch needs some improvement. I think he was a the product manager. Back in the early 90's I worked with another Engineer on a project we called The Hamblaster. I published two articles in QEX (October 1991 and January 1992). We developed a PC based sound card that connects to the receiver's audio and performed, among other things, an auto-notch and noise reduction (NR). In our DSP software, the auto-notch was generated by summing the inverted NR output to the input signal. Whether it's a noise reduction or an auto-notch we still used a software algorithm called the LMS (Least Means Square). Most Ham transceiver use the same LMS algorithm and I never heard distorted audio when the notch was engaged. That's especially true with Yaesu, Icom or Kenwood. I'm not sure about the other American brands but I bet they are OK as well. My second complaint is the K3's NR control. Most other manufacturers have an analog like control that simply changes the NR level. I don't understand the logic of having several steps from F1-1 to F4-4 and F5-1 (mixed) to F8-4 (mixed). I would rather have two separate settings. F0 to F9 for the level and if you want a to fiddle with the delay, D0 to D9 in the main menu. I think the level control on other radios is simply a mix of the input signal with the NR output and is similar to the K3's mF5-1 to mF8-4 To me it sounds as if there's a dynamic range problem on the K3 whereby the numbers in the math are over-ranging when the notch is engaged and is causing a flat-topping in the audio signal. But that's just a guess! I hope someone at Elecraft reads this and gets the ball rolling to fix the problem! Jack WA9FVP Willco Electronics rep...@willcoele.com - Jack WA9FVP Sent from my TRS-80 :-) -- View this message in context: http://elecraft.365791.n2.nabble.com/Auto-Notch-Revisited-tp7591810.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 Message delivered to ae...@worldwidedx.com -- Owner, worldwidedx.com AE6LX, Amateur Radio NNN0ITA, Navy MARS NNN0GAF FOUR, Southern CA Director Assistant for Training, Navy MARS __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
I think I see where the confusion has arisen. Here we are talking about a K2 with integrated KAT2 ATU. So, when I used the term rig end of the feedline, I was referring to where the feedline connects to the KAT2 BNC connector at the back of the K2, which is the output or antenna side of the KAT2 ATU. In order to make the impedance where the antenna connects to the KAT2 output look like 50+0j ohms, the KAT2 will use an LC network to transform the impedance. The impedance of this LC network together with the 50ohms of the K2 final PA output will be equal to the complex conjugate of the impedance you will see looking into the shack end of the feedline leading to your antenna. For example, to keep the maths simple, let's consider a case where the impedance at the end of the feedline in the shack works out to be 50+j100ohms. That is, the antenna is slightly inductive. In order to transform this impedance to 50ohms, you could connect a capacitor in series that has a reactance of 100ohms to cancel out the inductive reactance of the antenna+feedline. If we look at the impedance of our matching network plus radio, we see the capacitor in series with the 50ohm transmitter, so the impedance looking into the ATU plus transmitter is 50-j100 ohms. This is the complex conjugate of the impedance looking down the feedline towards the antenna, which we already see is 50+j100ohms. In a more complicated scenario, the resistive component at the shack end of the feedline may not be 50ohms, and our matching network will be more complicated, and we will connect some reactance across the feedline and/or transmitter to achieve the required impedance transformation. If you go through the maths, you will again find the impedance looking into the ATU+transmitter is the complex conjugate of the impedance looking into the feedline+antenna. 73, Matt VK2RQ On 1 Aug 2014, at 7:29 am, Per-Tore Aasestrand p...@ieee.org wrote: Hi Don, I still doubt that this is correct. The L/C values given by the tuner, are the values as seen from the tx side. It is the values that will make the tx happy. It does not say much about the impedance at the rig end of the feeder. In order to change the VSWR on the feeder itself, one has to put the matching network (tuner) between the antenna and the feeder. BTW, the tx is probably not conjugate matched by the tuner. Conjugate matching does not apply to transmitters or power amplifiers. But I realize there is a huge dissension in this area too. ;-) Per-Tore / LA7NO On 31 July 2014 22:42, Don Wilhelm w3...@embarqmail.com wrote: Per-Tore, Yes it is correct. He stated that it is the impedance at the rig end of the feedline. That will not likely be the feedpoint impedance of the antenna. That impedance can be found if you do the calculations for the impedance transformation of the feedline (for which the length of the feedline must be known). 73, Don W3FPR On 7/31/2014 4:23 PM, Per-Tore Aasestrand wrote: Hi Matt, Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. I wonder if this is correct IMO, the task of the tuner is to make the tx happy, so it can look into the load it is designed for. Thus, it will translate the impedance as seen from the antenna connector into something as close to 50 ohm as possible. The tuner will not change anything on the feeder. With or without the tuner, the feeder will have the same VSWR. Per-Tore / LA7NO On 31 July 2014 22:02, Matt VK2RQ matt.vk...@gmail.com wrote: Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. However, if you want to know the impedance of your antenna, you need to realise that the feedline is acting as an impedance transformer, and you need to take into account factors such as length of feedline, frequency of operation characteristic impedance and velocity factor of the feedline, etc.. 73, Matt VK2RQ On 1 Aug 2014, at 1:02 am, TF3KX kristi...@gmail.com wrote: Thanks. Yes, I can determine the tuner settings (L/C-values, etc.) and from the network equations derive the impedance these settings match into. It would be neat if the K2 had enough CPU power and memory to carry these calculations out for me and just display the R+jX. Perhaps a good project for a small program or an app... 73 - Kristinn, TF3KX -- View this message in context: http://elecraft.365791.n2.nabble.com/Can-I-measure-antenna-impedance-with-K2-tp7591798p7591803.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
Re: [Elecraft] Auto Notch Revisited.
Hello, I find I must also agree with the complaints regarding notching... I just cam from a Icom 756 P3, and the notching was far superior to the K3. -- Thanks and 73's, For equipment, and software setups and reviews see: www.nk7z.net for MixW support see; http://groups.yahoo.com/neo/groups/mixw/info for Dopplergram information see: http://groups.yahoo.com/neo/groups/dopplergram/info for MM-SSTV see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Thu, 2014-07-31 at 17:28 -0400, Bill W2BLC wrote: I completely agree - the K3 is very lacking with their auto-notch. It requires fiddling with the AGC menus to force it to function without ruining the fidelity of a SSB signal. The NR system is very complex with many settings - none of which I have found to be very helpful - certainly no better than just using my ears. The subject has been brought up several times since I became interested in the K3 and started following the various reflectors and groups. They are both weak points of the K3 and should be addressed. Most other currently available rigs are easier to operate in the NR arena and much more pleasing to listen to in the auto-notch arena. I have found some work-arounds and mentioned them in previous posts. That said, why are work-arounds needed??? Bill W2BLC K-Line __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Hi list, Isn't an RF transmitter or PA actually more like a current generator? Its internal resistance is kept low in order to reduce internally dissipated power, with consequent reduction in efficiency. It is usually designed to work efficiently into 50 ohms. It is important to know the difference between these two statements: (A) The transmitter has a 50 ohm output impedance. (B) The transmitter is designed to work into a 50 ohm load A transmitter will be able to put its rated power into a 50 ohm load, but this says nothing about its output impedance. That is why I don't think conjugate matching will be appropriate. (Hope this is not getting too much OT now) Per-Tore / LA7NO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Per-Tor, The tuner (if properly calibrated using a 50 ohm non-reactive load) will show close to 1:1 SWR at the tuner *input* after a TUNE - it is close enough that it is practical to assume it is 50 ohms resistive. After that TUNE, the Lx.xx Cx.xx and NET x ATU menu parameters will indicate the inductance, capacitance and L network configuration that were used in the ATU to achieve that match. Working through the L network impedance transformation using a 50 ohm input will produce the impedance at the output of the ATU. That will be the conjugate of the impedance presented in the shack by the feedline. You are correct that an ATU does *not* alter the VSWR on the feedline - it is only capable of altering the VSWR at the *input to the tuner to make the transmitter PA stage happy with the 50 ohm ATU input impedance. I don't think the original poster nor any of the responses made any inferences that the feedline impedance was being changed. 73, Don W3FPR On 7/31/2014 5:29 PM, Per-Tore Aasestrand wrote: Hi Don, I still doubt that this is correct. The L/C values given by the tuner, are the values as seen from the tx side. It is the values that will make the tx happy. It does not say much about the impedance at the rig end of the feeder. In order to change the VSWR on the feeder itself, one has to put the matching network (tuner) between the antenna and the feeder. BTW, the tx is probably not conjugate matched by the tuner. Conjugate matching does not apply to transmitters or power amplifiers. But I realize there is a huge dissension in this area too. ;-) Per-Tore / LA7NO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
I think we have hit the posting limit for this topic, so I'll just finish with this remark: the maximum power transfer between a power amplifier and its load will occur when the source and load impedances are complex conjugates (this can be seen using the voltage divider equation and some differential calculus). In the case of a purely resistive load, this reduces down to the source and load resistances being equal. 73, Matt VK2RQ On 1 Aug 2014, at 8:24 am, Per-Tore Aasestrand p...@ieee.org wrote: Hi list, Isn't an RF transmitter or PA actually more like a current generator? Its internal resistance is kept low in order to reduce internally dissipated power, with consequent reduction in efficiency. It is usually designed to work efficiently into 50 ohms. It is important to know the difference between these two statements: (A) The transmitter has a 50 ohm output impedance. (B) The transmitter is designed to work into a 50 ohm load A transmitter will be able to put its rated power into a 50 ohm load, but this says nothing about its output impedance. That is why I don't think conjugate matching will be appropriate. (Hope this is not getting too much OT now) Per-Tore / LA7NO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to matt.vk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Matt, I believe it is even more 'simple' than that. When the ATU wattmeter is properly calibrated, it is then set to measure an SWR of 1 at 50 ohms resistive load. When a TUNE produces an SWR=1, the impedance at the input (coax inside the K2) has been transformed to 50 ohms, so that is a known quantity. The ATU L and C show the values used to arrive at that transformation, and the NET parameter indicates whether the capacitor is on the input or the output side. So the L network values and configuration are known. It is then a task to solve the network equations for an L network having series L and shunt C elements to arrive at the output impedance. Yes, the transmission line impedance (at the BNC connector) will be the conjugate of that impedance. Nothing has been said about the SWR on the feedline nor the feedpoint impedance at the antenna. 73, Don W3FPR On 7/31/2014 5:56 PM, Matt VK2RQ wrote: I think I see where the confusion has arisen. Here we are talking about a K2 with integrated KAT2 ATU. So, when I used the term rig end of the feedline, I was referring to where the feedline connects to the KAT2 BNC connector at the back of the K2, which is the output or antenna side of the KAT2 ATU. In order to make the impedance where the antenna connects to the KAT2 output look like 50+0j ohms, the KAT2 will use an LC network to transform the impedance. The impedance of this LC network together with the 50ohms of the K2 final PA output will be equal to the complex conjugate of the impedance you will see looking into the shack end of the feedline leading to your antenna. For example, to keep the maths simple, let's consider a case where the impedance at the end of the feedline in the shack works out to be 50+j100ohms. That is, the antenna is slightly inductive. In order to transform this impedance to 50ohms, you could connect a capacitor in series that has a reactance of 100ohms to cancel out the inductive reactance of the antenna+feedline. If we look at the impedance of our matching network plus radio, we see the capacitor in series with the 50ohm transmitter, so the impedance looking into the ATU plus transmitter is 50-j100 ohms. This is the complex conjugate of the impedance looking down the feedline towards the antenna, which we already see is 50+j100ohms. In a more complicated scenario, the resistive component at the shack end of the feedline may not be 50ohms, and our matching network will be more complicated, and we will connect some reactance across the feedline and/or transmitter to achieve the required impedance transformation. If you go through the maths, you will again find the impedance looking into the ATU+transmitter is the complex conjugate of the impedance looking into the feedline+antenna. 73, Matt VK2RQ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Would not this imply a maximum efficiency of 50% ? P-T On 1 August 2014 00:40, Matt VK2RQ matt.vk...@gmail.com wrote: I think we have hit the posting limit for this topic, so I'll just finish with this remark: the maximum power transfer between a power amplifier and its load will occur when the source and load impedances are complex conjugates (this can be seen using the voltage divider equation and some differential calculus). In the case of a purely resistive load, this reduces down to the source and load resistances being equal. 73, Matt VK2RQ On 1 Aug 2014, at 8:24 am, Per-Tore Aasestrand p...@ieee.org wrote: Hi list, Isn't an RF transmitter or PA actually more like a current generator? Its internal resistance is kept low in order to reduce internally dissipated power, with consequent reduction in efficiency. It is usually designed to work efficiently into 50 ohms. It is important to know the difference between these two statements: (A) The transmitter has a 50 ohm output impedance. (B) The transmitter is designed to work into a 50 ohm load A transmitter will be able to put its rated power into a 50 ohm load, but this says nothing about its output impedance. That is why I don't think conjugate matching will be appropriate. (Hope this is not getting too much OT now) Per-Tore / LA7NO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to matt.vk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Auto Notch Revisited.
Hello David, I concur with your observation. There are many areas that K3 are better than ic756 pro 3 but the NR, manual notch and auto notch of K3 have much rooms for improvement. When there is a strong undesirable carrier next to a weak DX, in 756pro3, I can use manual notch to 'kill' the carrier and eliminate the pumping effect on AGC. Every radio has its own merit. We have to accept their weakness while we are enjoying their strength. Anyway, I would like the NR of K3 will be as good as the NR of KX3. At one time, I nearly sold the K3 and just kept the KX3. On reflection, K3 is still a good contesting machine at desktop size, hence I still keep my K3. 73 Johnny VR2XMC 寄件人︰ David Cole d...@nk7z.net 收件人︰ elecraft@mailman.qth.net 傳送日期︰ 2014年08月1日 (週五) 6:12 AM 主題︰ Re: [Elecraft] Auto Notch Revisited. Hello, I find I must also agree with the complaints regarding notching... I just cam from a Icom 756 P3, and the notching was far superior to the K3. -- Thanks and 73's, For equipment, and software setups and reviews see: www.nk7z.net for MixW support see; http://groups.yahoo.com/neo/groups/mixw/info for Dopplergram information see: http://groups.yahoo.com/neo/groups/dopplergram/info for MM-SSTV see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Thu, 2014-07-31 at 17:28 -0400, Bill W2BLC wrote: I completely agree - the K3 is very lacking with their auto-notch. It requires fiddling with the AGC menus to force it to function without ruining the fidelity of a SSB signal. The NR system is very complex with many settings - none of which I have found to be very helpful - certainly no better than just using my ears. The subject has been brought up several times since I became interested in the K3 and started following the various reflectors and groups. They are both weak points of the K3 and should be addressed. Most other currently available rigs are easier to operate in the NR arena and much more pleasing to listen to in the auto-notch arena. I have found some work-arounds and mentioned them in previous posts. That said, why are work-arounds needed??? Bill W2BLC K-Line __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net/ Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net/ Please help support this email list: http://www.qsl.net/donate.html Message delivered to vr2...@yahoo.com.hk __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
P-T, If one uses the voltage divider example, yes the maximum efficiency is 50%, But the output of a PA stage is not a resistor, and the collector load resistance is set by the designer to produce the output power desired. The 'resistor' assumption is a simplification that can be used when constructing equivalent circuits to analyze the voltages and currents in the network that follows the perfect generator. The theory of large signal amplifiers is too great for detailed discussion on this reflector, so we usually have to settle for simplifications. An equivalent circuit is not a full representation of the workings of an actual PA stage. I believe that is where the misunderstanding comes from. 73, Don W3FPR On 7/31/2014 6:57 PM, Per-Tore Aasestrand wrote: Would not this imply a maximum efficiency of 50% ? P-T On 1 August 2014 00:40, Matt VK2RQ matt.vk...@gmail.com wrote: I think we have hit the posting limit for this topic, so I'll just finish with this remark: the maximum power transfer between a power amplifier and its load will occur when the source and load impedances are complex conjugates (this can be seen using the voltage divider equation and some differential calculus). In the case of a purely resistive load, this reduces down to the source and load resistances being equal. 73, Matt VK2RQ On 1 Aug 2014, at 8:24 am, Per-Tore Aasestrand p...@ieee.org wrote: Hi list, Isn't an RF transmitter or PA actually more like a current generator? Its internal resistance is kept low in order to reduce internally dissipated power, with consequent reduction in efficiency. It is usually designed to work efficiently into 50 ohms. It is important to know the difference between these two statements: (A) The transmitter has a 50 ohm output impedance. (B) The transmitter is designed to work into a 50 ohm load A transmitter will be able to put its rated power into a 50 ohm load, but this says nothing about its output impedance. That is why I don't think conjugate matching will be appropriate. (Hope this is not getting too much OT now) Per-Tore / LA7NO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to matt.vk...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
On 7/31/2014 1:23 PM, Per-Tore Aasestrand wrote: Hi Matt, Of course you realise that the output impedance of the ATU will be the complex conjugate of the impedance at the rig end of your feedline. I wonder if this is correct Well, it is, however it wasn't the original question. IMO, the task of the tuner is to make the tx happy, so it can look into the load it is designed for. Thus, it will translate the impedance as seen from the antenna connector into something as close to 50 ohm as possible. The tuner will not change anything on the feeder. With or without the tuner, the feeder will have the same VSWR. You are correct Per-Tore. Looking into the male connector on your feedline, you will see *some* impedance which depends on the impedance at the feedpoint of your antenna, the characteristic impedance of your feedline, and the length of your feedline ... with one exception: If the feedpoint impedance of your antenna is totally resistive, *and* is exactly equal to the characteristic impedance of your feedline, then length only matters when calculating loss. This situation hardly ever occurs for any real hams however. :-) The KAT2 antenna tuner does not tune the antenna, or anything else for that matter. It is simply an L-C network [L-network in the KAT2] that transforms the complex impedance seen at the BNC connector to what the PA output filter wants to work into ... nominally 50+j0 ohms. Once you get a match and find out the L, C, and configuration of the L-network in the tuner, you can use the L-network equations to determine the impedance transformation taking place in the tuner and thus the complex impedance looking into the feedline connector If you know the complex impedance looking into the feedline connector, the characteristic impedance of the line, and it's length, you can use one of many programs to calculate the impedance of your antenna at the feedpoint. I use N6BV's TLW which comes on the CD with the ARRL Antenna Book, but there are many other ways, including paper and pencil on a Smith Chart. And yes, you are also correct that the presence of the tuner will not affect the VSWR on the feedline, nor the loss incurred by that VSWR. Hope this helps. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K2-10 - KXPA100 - AMERITRON AL811H?
My K2-10 is my backup rig. It has an internal homemade transistor amp keyer that keys the AL811H when 100 watts is needed. I would like to add the KXPA100 to have the option to fully drive the AL811H when needed, or to run 100 watts without tuning the larger amp. What would be the best way to key both amps at the same time? Any other considerations that I should know for setting up this configuration? For those that may ask, the reason I want to use the KXPA100 instead of the internal K2 amp is so the radio will still be available for qrp backpacking and such. Thanks for your help! Dean KG7MZ Sent from my Galaxy Note III __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Auto Notch Revisited.
Agreed, now let's hope somebody IS listening and get this long term issue resolved. The Manual Notch eliminates a CW carrier nicely but it too requires button presses and adjustment that could be simplified surely? Gary On 1 August 2014 08:57, Johnny Siu vr2...@yahoo.com.hk wrote: Hello David, I concur with your observation. There are many areas that K3 are better than ic756 pro 3 but the NR, manual notch and auto notch of K3 have much rooms for improvement. When there is a strong undesirable carrier next to a weak DX, in 756pro3, I can use manual notch to 'kill' the carrier and eliminate the pumping effect on AGC. Every radio has its own merit. We have to accept their weakness while we are enjoying their strength. Anyway, I would like the NR of K3 will be as good as the NR of KX3. At one time, I nearly sold the K3 and just kept the KX3. On reflection, K3 is still a good contesting machine at desktop size, hence I still keep my K3. 73 Johnny VR2XMC 寄件人︰ David Cole d...@nk7z.net 收件人︰ elecraft@mailman.qth.net 傳送日期︰ 2014年08月1日 (週五) 6:12 AM 主題︰ Re: [Elecraft] Auto Notch Revisited. Hello, I find I must also agree with the complaints regarding notching... I just cam from a Icom 756 P3, and the notching was far superior to the K3. -- Thanks and 73's, For equipment, and software setups and reviews see: www.nk7z.net for MixW support see; http://groups.yahoo.com/neo/groups/mixw/info for Dopplergram information see: http://groups.yahoo.com/neo/groups/dopplergram/info for MM-SSTV see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Thu, 2014-07-31 at 17:28 -0400, Bill W2BLC wrote: I completely agree - the K3 is very lacking with their auto-notch. It requires fiddling with the AGC menus to force it to function without ruining the fidelity of a SSB signal. The NR system is very complex with many settings - none of which I have found to be very helpful - certainly no better than just using my ears. The subject has been brought up several times since I became interested in the K3 and started following the various reflectors and groups. They are both weak points of the K3 and should be addressed. Most other currently available rigs are easier to operate in the NR arena and much more pleasing to listen to in the auto-notch arena. I have found some work-arounds and mentioned them in previous posts. That said, why are work-arounds needed??? Bill W2BLC K-Line __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net/ Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@nk7z.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net/ Please help support this email list: http://www.qsl.net/donate.html Message delivered to vr2...@yahoo.com.hk __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to vk1zzg...@gmail.com -- *Gary - VK1ZZ, K3NHLSkype: Gary.VK1ZZhttp://www.qsl.net/vk1zz http://www.qsl.net/vk1zzMotorhome Portable* *Grumpy's House* *Elecraft K3KPA500FTKAT500FT* __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
Hi Don, On 1 August 2014 01:16, Don Wilhelm w3...@embarqmail.com wrote: If one uses the voltage divider example, yes the maximum efficiency is 50%, But the output of a PA stage is not a resistor, and the collector load resistance is set by the designer to produce the output power desired. I fully agree. But will not a conjugate match also imply a max efficiency of 50% P-T __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2-10 - KXPA100 - AMERITRON AL811H?
I put my KPA100 and KAT100 in a separate EC2 enclosure. This allows the K2/10 to be unhooked and taken portable. It also provides the key out jack for driving a larger amp in the shack. Mike KI0HA On 7/31/2014 6:22 PM, Dean wrote: My K2-10 is my backup rig. It has an internal homemade transistor amp keyer that keys the AL811H when 100 watts is needed. I would like to add the KXPA100 to have the option to fully drive the AL811H when needed, or to run 100 watts without tuning the larger amp. What would be the best way to key both amps at the same time? Any other considerations that I should know for setting up this configuration? For those that may ask, the reason I want to use the KXPA100 instead of the internal K2 amp is so the radio will still be available for qrp backpacking and such. Thanks for your help! Dean KG7MZ Sent from my Galaxy Note III __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to mtebe...@mchsi.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Auto Notch Revisited.
I rarely use the manual notch on CW, I've had other rigs with notch filters, and I rarely used them either ... it seems that the filter in my head is enough. I'm not on SSB very much [compromised hearing, not mode-aversion], and I've occasionally used the auto-notch on SSB when in longer-than-a-contest-QSO mode. It's always worked very well for me. I suppose there is some accompanying distortion, that's what happens when you punch out a narrow part of the baseband, but honestly, it reduced the carrier to where I couldn't hear it. I think, but do not know, that the performance of several of the K3 DSP features are closely related to the AGC parameters being used. This makes sense, the AGC is distorting the signal possibly before the other features are getting the number stream. All of that is above my pay grade. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org On 7/31/2014 3:12 PM, David Cole wrote: Hello, I find I must also agree with the complaints regarding notching... I just cam from a Icom 756 P3, and the notching was far superior to the K3. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] SSB Power Creep
I notice on MARS frequencies (slightly outside ham bands) that my power output starts out low and builds to full output over 10-20 seconds of transmit. The symptom is easily observed during an MT63 transmission and receiving stations comment that my signal starts out light and builds to a strong signal as the transmission progresses. I have run the calibration routine several times into a dummy load and all seems to go well but the problem persists. I see the same symptom in some ham bands but to a lesser extent, perhaps starting at half power and coming up to full power in a 10 seconds. Has anyone else experienced this or have ideas about a fix? God Bless 73! Jack - WE5ST __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] SSB Power Creep
Which Elecraft rig? —wunder, K6WRU On Jul 31, 2014, at 5:57 PM, Jack Berry via Elecraft elecraft@mailman.qth.net wrote: I notice on MARS frequencies (slightly outside ham bands) that my power output starts out low and builds to full output over 10-20 seconds of transmit. The symptom is easily observed during an MT63 transmission and receiving stations comment that my signal starts out light and builds to a strong signal as the transmission progresses. I have run the calibration routine several times into a dummy load and all seems to go well but the problem persists. I see the same symptom in some ham bands but to a lesser extent, perhaps starting at half power and coming up to full power in a 10 seconds. Has anyone else experienced this or have ideas about a fix? God Bless 73! Jack - WE5ST __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to wun...@wunderwood.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure antenna impedance with K2?
P-T, No, a conjugate match will assure 100% power transfer. Look at it this way - what the conjugate match says is that if you cut a transmission line at any point, looking one way at that cut point, you will have some impedance - example is 70 + j20. Now look the other way and the impedance will be the conjugate match - 70 - j20. That is the condition that exists. It also happens to be the condition for maximum power transfer. Since that cut can be made at any and all points along the transmission line - think what would happen if the efficiency at each of those points (when connected together) were 50% - nothing would get to the antenna. So we know that 50% is *not* the efficiency of any and all junctions of any conjugate match. Mixing the conjugate match concept with the maximum power transfer theorem is getting us into confusion - there are 'holes' in that combination. Yes, they work together, but not seamlessly. If a generator has an internal impedance of 50 ohms, the maximum power transfer will be only if the load to that generator is also 50 ohms. That says nothing about a conjugate match. Now to further complicate things, the internal impedance of a generator has nothing to do with the efficiency of that generator - especially if we are discussing a PA output stage. Bringing the conjugate match concept into the internal design of a PA stage is in error - it just does not work that way. The conjugate match only applies to the output of that amplifier stage. In other words, if we send 10 watts into a feedline (or ATU), all 10 watts will go to the load (antenna) except for losses in the feedline. I am not about to embark on the design and efficiency of a PA stage on this reflector, so take the conjugate match and maximum power transfer theorem only to the terminals at the PA stage and all will make sense. They do not apply to the internals of that stage. 73, Don W3FPR On 7/31/2014 7:32 PM, Per-Tore Aasestrand wrote: Hi Don, On 1 August 2014 01:16, Don Wilhelm w3...@embarqmail.com wrote: If one uses the voltage divider example, yes the maximum efficiency is 50%, But the output of a PA stage is not a resistor, and the collector load resistance is set by the designer to produce the output power desired. I fully agree. But will not a conjugate match also imply a max efficiency of 50% P-T __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure Antenna Impedance
Most interesting discussion ~ and my comment ~ I bought an Elecrfat K2 in 1999 but also a Kachina 505DSP (a software controlled transceiver) The Kachina has a subroutine ~ when activated, it displays a Smith Chart of the current conditions of the match, in a separate display window --- always thought that was rather a nice feature --- Maybe some newer Elecraft transceiver might include this feature in the next decade? Cheers, Jan K1ND __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] SSB Power Creep
Jack, I would suggest that you do not have sufficient audio drive. That is the normal behavior of Elecraft products in digital modes when the audio drive is low. If you are following the typical 'wisdom' of using the audio level to control the output power, forget that - the Elecraft transceivers are different in the way they control power, and that method will not work. It will produce exactly the symptoms you state. For the K3 and KX3, adjust the audio so the ALC meter shows 4 bars solid and the 5th bar solid, then adjust the power knob for the desired power level. If you have a K2, set the LED display to show ALC and adjust the audio until you see 1 bar of ALC, then back down the audio until that bar just goes out. Again, adjust the power level with the power knob. 73, Don W3FPR On 7/31/2014 8:57 PM, Jack Berry via Elecraft wrote: I notice on MARS frequencies (slightly outside ham bands) that my power output starts out low and builds to full output over 10-20 seconds of transmit. The symptom is easily observed during an MT63 transmission and receiving stations comment that my signal starts out light and builds to a strong signal as the transmission progresses. I have run the calibration routine several times into a dummy load and all seems to go well but the problem persists. I see the same symptom in some ham bands but to a lesser extent, perhaps starting at half power and coming up to full power in a 10 seconds. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Auto Notch Revisited.
The trouble with the K3 notch is that it is outside the agc loop(audio notch) unlike the Icom radio. It may notch out the tone but not the carrier. A huge signal will still swamp the receiver. You will get arguments that this is better on receiver imd performance but I think I could live with receiver imd degradradation for the small if not brief time I would use the inside the agc loop notch. 73, John N1JM k6dgw wrote I rarely use the manual notch on CW, I've had other rigs with notch filters, and I rarely used them either ... it seems that the filter in my head is enough. I'm not on SSB very much [compromised hearing, not mode-aversion], and I've occasionally used the auto-notch on SSB when in longer-than-a-contest-QSO mode. It's always worked very well for me. I suppose there is some accompanying distortion, that's what happens when you punch out a narrow part of the baseband, but honestly, it reduced the carrier to where I couldn't hear it. I think, but do not know, that the performance of several of the K3 DSP features are closely related to the AGC parameters being used. This makes sense, the AGC is distorting the signal possibly before the other features are getting the number stream. All of that is above my pay grade. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org On 7/31/2014 3:12 PM, David Cole wrote: Hello, I find I must also agree with the complaints regarding notching... I just cam from a Icom 756 P3, and the notching was far superior to the K3. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto: Elecraft@.qth This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to lists+1215531472858-365791@.nabble - 73, John N1JM K3 #5986 P3 #1752 KPA500 #596 KX3 #926 XG3 XG1 -- View this message in context: http://elecraft.365791.n2.nabble.com/Auto-Notch-Revisited-tp7591810p7591833.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 Message delivered to arch...@mail-archive.com
[Elecraft] SSB net needs temporary NCS
I will be on a mountain top in the Cascades this Sunday for a Summits on the Air (SOTA) event. Is there anyone who would like to fill in this week. It’s at 1800Z on 14.3035 MHz. It’s not difficult. How about one of you regulars who should have the hang of it right away? BTW, John, N6JW, won’t be available this week either. 73, Phil, NS7P __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Auto Notch Revisited.
The Icom’s manual notch is inside the AGC loop, but not the auto notch. The early (Version 1) Orion firmware had the auto notch inside the AGC loop, and it was one of the many great features of that radio. In AM mode, you could punch in audo-notch and it would remove the carrier to let just the sideband energy drive the AGC — which often made uncopyable low-modulation percentage AM signals readable. And of course, auto-notched interfering carriers would not affect AGC. When Ten-tec completely rewrote the software (Version 2) they moved the auto notch outside the loop, and there were universal complaints (at least compared to how the notch worked in V1 firmware). It’s unfortunate that there were other factors that eventually led to the rewrite. Obviously there are design tradeoffs, and I don’t fully understand them all. But it does seem that it’s feasible to put a manual (e.g. non-adaptive) notch inside the AGC loop without doing too much damage to IMD or other specs. Maybe even do it as a menu selectable option if there are performance tradeoffs. Grant NQ5T On Jul 31, 2014, at 9:23 PM, John_N1JM johnn...@gmail.com wrote: The trouble with the K3 notch is that it is outside the agc loop(audio notch) unlike the Icom radio. It may notch out the tone but not the carrier. A huge signal will still swamp the receiver. You will get arguments that this is better on receiver imd performance but I think I could live with receiver imd degradradation for the small if not brief time I would use the inside the agc loop notch. On 7/31/2014 3:12 PM, David Cole wrote: Hello, I find I must also agree with the complaints regarding notching... I just cam from a Icom 756 P3, and the notching was far superior to the K3. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Auto Notch Revisited.
A feature that we added to the Hamblaster was something I called a Filter Freeze button. It was something I suggested and turned out to be very affective. It wasn't really physical a button. It was actually an on screen control that passed a parameter to the Hamblaster telling the LMS algorithm to stop up dating. The LMS algorithm converged on the carrier and then stopped updating it's coefficients . It locked the auto-notch frequency and killed the carrier without affecting the voice. The Idea was to have a semi-automatic filter that you can press a button, quickly notch the carrier and lock the null frequency and depth. A manual adjustable notch was too cumbersome and would required fiddling with the frequency adjustment knob while trying to null the carrier. I would love to see this feature added to the K3. Jack WA9FVP Willco Electronics rep...@willcoele.com - Jack WA9FVP Sent from my TRS-80 :-) -- View this message in context: http://elecraft.365791.n2.nabble.com/Auto-Notch-Revisited-tp7591810p7591836.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 Message delivered to arch...@mail-archive.com
[Elecraft] [K3] Manual Notch Reconsidered
A recent post mentioned that the frequency and bandwidth of the K3 notch could be controlled. If the bandwidth of the manual notch can be controlled, I am unaware of how to go about it. I've found it broader than I think it needs to be. I recall seeing it applied to an SSTV waterfall and it was 100Hz wide (or wider?) with a flat bottom. We've been talking about some features that may not be quite what we like them to be. I got a good compliment on the K3 VOX in the past couple of days.no clipping of the startup of VOX whatsoever. As well, there are a lot of stations that could benefit from the type noise gate the K3 uses. 73, Dick - KA5KKT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Can I measure Antenna Impedance
Wouldn't that be cool! An antenna analyser function using say the K3 with the P3 for display. My guess is most of the necessary hardware might already be in place :) Martin, HS0ZED On 01/08/2014 04:41, Jan wrote: Most interesting discussion ~ and my comment ~ I bought an Elecrfat K2 in 1999 but also a Kachina 505DSP (a software controlled transceiver) The Kachina has a subroutine ~ when activated, it displays a Smith Chart of the current conditions of the match, in a separate display window --- always thought that was rather a nice feature --- Maybe some newer Elecraft transceiver might include this feature in the next decade? Cheers, Jan K1ND __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to mar...@hs0zed.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Manual Notch Reconsidered
Page 25 in K3 Owner's man D10.pdf Available in the download section of the Elecraft web page. Get the latest Adobe Reader to view the .pdf file. CTRL-F will bring up a search window upper right corner of the Reader. Helps to make quick searches in large .pdf documents which would sometimes be murder in a paper version. Also finds things in Elecraft schematic diagram .pdf files. 73, Guy On Fri, Aug 1, 2014 at 1:10 AM, Dick Dickinson softb...@windstream.net wrote: A recent post mentioned that the frequency and bandwidth of the K3 notch could be controlled. If the bandwidth of the manual notch can be controlled, I am unaware of how to go about it. I've found it broader than I think it needs to be. I recall seeing it applied to an SSTV waterfall and it was 100Hz wide (or wider?) with a flat bottom. We've been talking about some features that may not be quite what we like them to be. I got a good compliment on the K3 VOX in the past couple of days.no clipping of the startup of VOX whatsoever. As well, there are a lot of stations that could benefit from the type noise gate the K3 uses. 73, Dick - KA5KKT __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k2av@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] Manual Notch Reconsidered
It is possible to adjust the CENTER frequency. I’m unaware of any way to change the notch bandwidth. Grant NQ5T On Aug 1, 2014, at 12:29 AM, Guy Olinger K2AV k2av@gmail.com wrote: Page 25 in K3 Owner's man D10.pdf Available in the download section of the Elecraft web page. On Fri, Aug 1, 2014 at 1:10 AM, Dick Dickinson softb...@windstream.net wrote: A recent post mentioned that the frequency and bandwidth of the K3 notch could be controlled. If the bandwidth of the manual notch can be controlled, I am unaware of how to go about it. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
