Re: [Elecraft] K2 noise on receiver when switching from transmit
Don, your question is valid but I’m afraid I don’t have a good answer. I honestly don’t know if this is a recent occurrence or if it has always been there because I have practically no run time on the KPA100 since I built it. I have put the KDSP2 in bypass and that does fix the problem, as long as I am not running full QSK. In other words, if I add 10ms or more worth of t-r delay, I don’t hear the popping with the KDSP2 bypassed. The receiver will pop if t-r delay is set to zero, but that’s probably par for the course. I have not done any sniffing around on the diodes, but that will be next on my to do list after Field Day. Thank you again for your help, and please let me know if you have any other suggestions or insight. 73, Mike, K4GU On Jun 10, 2015, at 6:36 AM, Don Wilhelm d...@w3fpr.com wrote: Mike, With the blue toroids, you do have the updated KPA100. Can I assume that this problem is a recent occurrence rather than a problem that has always been there? Yes, removing and jumpering out the KDSP2 will likely stop it (or just try putting it in bypass), but that is not the source of the real problem, it is just the source of the 'pop'. I would suggest digging into the KPA100 a bit. Lay the KPA100 on its 'back' on a book or box to the right of the K2, remove the shield and make the diode voltage measurements. Hopefully that will reveal an anomaly. 73, Don W3FPR On 6/10/2015 12:45 AM, Mike Fanning wrote: Thanks for the quick reply Don! I checked the 8R setting and it was indeed set to hold (and is set there again after toggling it to make sure). I do have the KDSP2 option with the KPA100, but after peeling off the right side panel I see two baby blue toroids. The K2 is serial number is 5882 and it was purchased in December 2006. The KPA100 was bought at Dayton in 2009. I think it took me another year to get around to building it, so it was probably buttoned up about 5 years ago and has been the backup/receive only rig since doing all the alignment checks. This will be the first time I have really done any transmitting with it since adding the KPA100 (I’ll make sure to revisit the PA screws as instructed). You have given me something else to check though - I need to pull the KDSP2 and see if that affects the problem. I’m wondering if there were other upgrades to either the K2 or KDSP2 that might affect this as well? __ 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 noise on receiver when switching from transmit
Mike, With the blue toroids, you do have the updated KPA100. Can I assume that this problem is a recent occurrence rather than a problem that has always been there? Yes, removing and jumpering out the KDSP2 will likely stop it (or just try putting it in bypass), but that is not the source of the real problem, it is just the source of the 'pop'. I would suggest digging into the KPA100 a bit. Lay the KPA100 on its 'back' on a book or box to the right of the K2, remove the shield and make the diode voltage measurements. Hopefully that will reveal an anomaly. 73, Don W3FPR On 6/10/2015 12:45 AM, Mike Fanning wrote: Thanks for the quick reply Don! I checked the 8R setting and it was indeed set to hold (and is set there again after toggling it to make sure). I do have the KDSP2 option with the KPA100, but after peeling off the right side panel I see two baby blue toroids. The K2 is serial number is 5882 and it was purchased in December 2006. The KPA100 was bought at Dayton in 2009. I think it took me another year to get around to building it, so it was probably buttoned up about 5 years ago and has been the backup/receive only rig since doing all the alignment checks. This will be the first time I have really done any transmitting with it since adding the KPA100 (I’ll make sure to revisit the PA screws as instructed). You have given me something else to check though - I need to pull the KDSP2 and see if that affects the problem. I’m wondering if there were other upgrades to either the K2 or KDSP2 that might affect this as well? __ 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 noise on receiver when switching from transmit
Hi all, I have a K2 that I built some time ago that I added the KPA100 to at a later time. I don’t have more than 10 minutes worth of run time on the KPA100 and I’m putting a dress rehearsal together for Field Day in a couple of weeks. I noticed tonight that when I am running more than about 10 Watts (enough to kick the KPA100 on) that I get a nasty pop on the receiver whenever I come from transmit to receive mode. Changing the tx-rx delay doesn’t affect the noise, and whenever I back the power down so that the KPA100 is not engaged, the problem goes away. Any suggestions as to what might be going on? It will be really tiring to listen to the receiver in this mode for 24 hours at FD… Thanks for any light anyone can shed. 73, Mike, K4GU __ 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 noise on receiver when switching from transmit
Mike, I am curious to hear just how long ago that some time ago really is. The first thing to check is the setting of 8R - it should be set to HOLD with the KPA100 installed. To check, go in the menu to T-R, edit the parameter and then tap DISPLAY. If 8R was already set to HOLD, you will see 'nor' and you will have to tap DISPLAY again to set it back to HOLD. OTOH, if you see HOLD when you tap DISPLAY the first time, it had been set to 'nor' - when you see HOLD, tap the menu button twice to exit. There was a time when such pops could occur on some K2s that were equipped with both the KDSP2 and the KPA100. The real source was never discovered other than it was caused by some transition in the KPA100 T/R switch and related to the unmute timing in the KDSP2. That has not occurred in K2s that have the upgraded KPA100. So check your KPA100 - remove the right side panel and look between the shield and the board. If you see two toroids with blue cores, it has been upgraded, but if you see toroids with red cores, order the KPA100UPKT and do the upgrade. 73, Don W3FPR On 6/9/2015 11:13 PM, Mike Fanning wrote: Hi all, I have a K2 that I built some time ago that I added the KPA100 to at a later time. I don’t have more than 10 minutes worth of run time on the KPA100 and I’m putting a dress rehearsal together for Field Day in a couple of weeks. I noticed tonight that when I am running more than about 10 Watts (enough to kick the KPA100 on) that I get a nasty pop on the receiver whenever I come from transmit to receive mode. Changing the tx-rx delay doesn’t affect the noise, and whenever I back the power down so that the KPA100 is not engaged, the problem goes away. Any suggestions as to what might be going on? It will be really tiring to listen to the receiver in this mode for 24 hours at FD… __ 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 noise on receiver when switching from transmit
Thanks for the quick reply Don! I checked the 8R setting and it was indeed set to hold (and is set there again after toggling it to make sure). I do have the KDSP2 option with the KPA100, but after peeling off the right side panel I see two baby blue toroids. The K2 is serial number is 5882 and it was purchased in December 2006. The KPA100 was bought at Dayton in 2009. I think it took me another year to get around to building it, so it was probably buttoned up about 5 years ago and has been the backup/receive only rig since doing all the alignment checks. This will be the first time I have really done any transmitting with it since adding the KPA100 (I’ll make sure to revisit the PA screws as instructed). You have given me something else to check though - I need to pull the KDSP2 and see if that affects the problem. I’m wondering if there were other upgrades to either the K2 or KDSP2 that might affect this as well? Anyway, thanks for the lead and please let me know if you have any other ideas. 73, Mike, K4GU On Jun 9, 2015, at 10:52 PM, Don Wilhelm w3...@embarqmail.com wrote: Mike, I am curious to hear just how long ago that some time ago really is. The first thing to check is the setting of 8R - it should be set to HOLD with the KPA100 installed. To check, go in the menu to T-R, edit the parameter and then tap DISPLAY. If 8R was already set to HOLD, you will see 'nor' and you will have to tap DISPLAY again to set it back to HOLD. OTOH, if you see HOLD when you tap DISPLAY the first time, it had been set to 'nor' - when you see HOLD, tap the menu button twice to exit. There was a time when such pops could occur on some K2s that were equipped with both the KDSP2 and the KPA100. The real source was never discovered other than it was caused by some transition in the KPA100 T/R switch and related to the unmute timing in the KDSP2. That has not occurred in K2s that have the upgraded KPA100. So check your KPA100 - remove the right side panel and look between the shield and the board. If you see two toroids with blue cores, it has been upgraded, but if you see toroids with red cores, order the KPA100UPKT and do the upgrade. 73, Don W3FPR On 6/9/2015 11:13 PM, Mike Fanning wrote: Hi all, I have a K2 that I built some time ago that I added the KPA100 to at a later time. I don’t have more than 10 minutes worth of run time on the KPA100 and I’m putting a dress rehearsal together for Field Day in a couple of weeks. I noticed tonight that when I am running more than about 10 Watts (enough to kick the KPA100 on) that I get a nasty pop on the receiver whenever I come from transmit to receive mode. Changing the tx-rx delay doesn’t affect the noise, and whenever I back the power down so that the KPA100 is not engaged, the problem goes away. Any suggestions as to what might be going on? It will be really tiring to listen to the receiver in this mode for 24 hours at FD… __ 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 Noise on 160m
Thanks to all that responded to my K2 problem and thanks for the Tips Sverre, LA3ZA. I had done a simple tone adjustment and probably messed up the filters because the receive frequency shifts when filter 3 and 4 are selected. After that is corrected I will re-visit the noise problem. Thanks again Gary, Don, Sverre, and the K9 that responded. See you in the QRP ARCI 160m 6 hour sprint Wed. evening (in the US). 73/ Jim / W1FMR *Message: 4Date: Mon, 25 Nov 2013 19:01:16 +From: Gary McKelvie gary.mckel...@btinternet.com gary.mckel...@btinternet.comTo: elecraft@mailman.qth.net elecraft@mailman.qth.netSubject: Re: [Elecraft] K2 Signal to Noise on 160m ?Message-ID: 43498680-08c7-4f61-b779-0871815fa...@btinternet.com 43498680-08c7-4f61-b779-0871815fa...@btinternet.comContent-Type: text/plain; charset=us-asciiThank you to Sverre for the link to a very interesting and useful web page. 73 Gary G7USCSent from my iPhone On 24 Nov 2013, at 20:56, Sverre Holm (LA3ZA) la...@nrrl.no la...@nrrl.no wrote: You don't give so much information here about how you did the sidetone pitch adjustment, but it is easy to mess up things if you do that without adjusting filters also. See item 3 in the list of 'Elecraft K2 do's and don'ts' http://la3za.blogspot.no/2011/09/elecraft-k2-dos-and-donts.html http://la3za.blogspot.no/2011/09/elecraft-k2-dos-and-donts.html Jimithy66 wrote This a used K2 and I adjusted the STP (Sidetone Pitch) to my liking and wonder if that messed something up or is the K2 noisy on 160m ?* *Sidetone frequency:* Don't be tempted to adjust the sidetone frequency if you want it higher or lower in pitch (Menu, sidetone P menu). Many radios allow this and the K2's menu gives the impression that it is straightforward to do so. The flip side of the coin is that all the filter settings (XFIL) and the audio filter (KAF2) also need to be readjusted, otherwise the filters will not match the new sidetone. __ 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] K2 noise blanker question
Is there a simple way to check if the noise blanker for the K2 works? I tried to use it tonight but it didn't seem to make any difference. Then I tried turning a switch on a fan on and off, that produced S7 noise spikes on the S meter, but the noise blanker didn't seem to make a difference. Ron VE8RT __ 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] K2 noise blanker question
Ron, Yes, there is a simple test. Turn on the Preamp, do not connect an antenna, and tap the case of Q21 with something metallic (like a screwdriver). You will hear clicks along with bursts of sound because the screwdriver is acting as an antenna (it is important to distinguish between the two). When you turn on the NB, the clicks should diminish. Remember that the KNB2 responds to impulse noise only (like automotive ignition noise or nearby lightning static), it will not make any difference for noise that has a slower rise time, like atmospheric noise or other forms of wideband noise. The way the KNB2 works is to punch a hole in the received signal path - it blanks the signal path for a duration selected by the capacitor time constant. If the time constant is too long, it can create significant distortion in the received signal. Some have doubled the value of C11 (solder an additional .001 uF across its leads) and reported better results, but it really depends on your particular noise source. 73, Don W3FPR On 9/10/2011 12:36 AM, R Thompson wrote: Is there a simple way to check if the noise blanker for the K2 works? I tried to use it tonight but it didn't seem to make any difference. Then I tried turning a switch on a fan on and off, that produced S7 noise spikes on the S meter, but the noise blanker didn't seem to make a difference. Ron VE8RT __ 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] K2 Noise Blanker Revisions
I'm in the process of trying to bring an early K2 (serial#653) kicking and screaming into the 21st Century, I'll also point out that I'm not the original builder of this radio. For a while I've not been overly convinced about the sensitivity and dynamic range of this particular example, it hasn't helped matters that along the way in my investigations I found numerous build errors. Today my attention was drawn to the Noise Blanker option. I downloaded the manual and noticed there were some major differences between my example and that referenced in the manual. I have looked through the Elecraft website and found the archived manual for the main build but I can't find an archived manual for this particular example of Noise Blanker. I'm lucky in that I have a friend very local to me who is in the process of building a K2 and so this morning I had the opertuinity to try his more recent noise blanker board in my K2. WHAT A DIFFERENCE I would guestimate that there was a 25-30dB increase in performance when his noise blanker was installed. The biggest visual differences between the two boards are: My older example has variable capacitors for C3 and C5. Pins 3 and 4 of U3 are shorted together L1 and L2 are grey torroids, L1 having 13winding and L2 having 14 windings L3 is marked with brownish orangey paint and has 15 windings. I'm hoping someone maybe able to point me to an archived manual for this earlier version of the noise blanker so I can assertain if it is reworkable or whether a newer revision should be purchased. Regards Nidge (G0NIG) IO93dv -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-Noise-Blanker-Revisions-tp6610439p6610439.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] K2 Noise Blanker Part
Excellent response to building/parts questions is available at supp...@elecraft.com. 73 Neil NJ6L __ 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] K2 Noise Blanker Questions
I'm in the process of trying to bring an early K2 (serial#653) kicking and screaming into the 21st Century, I'll also point out that I'm not the original builder of this radio. For a while I've not been overly convinced about the sensitivity and dynamic range of this particular example, it hasn't helped matters that along the way in my investigations I found numerous build errors. Today my attention was drawn to the Noise Blanker option. I downloaded the manual and noticed there were some major differences between my example and that referenced in the manual. I have looked through the Elecraft website and found the archived manual for the main build but I can't find an archived manual for this particular example of Noise Blanker. I'm lucky in that I have a friend very local to me who is in the process of building a K2 and so this morning I had the opertuinity to try his more recent noise blanker board in my K2. WHAT A DIFFERENCE I would guestimate that there was a 25-30dB increase in performance when his noise blanker was installed. The biggest visual differences between the two boards are: My older example has variable capacitors for C3 and C5. Pins 5 and 6 of U3 are shorted together L1 and L2 are grey torroids, L1 having 13winding and L2 having 14 windings L3 is marked with brownish orangey paint and has 15 windings. I'm hoping someone maybe able to point me to an archived manual for this earlier version of the noise blanker so I can assertain if it is reworkable or whether a newer revision should be purchased. Regards Nidge (G0NIG) IO93dv __ 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] K2 Noise Blanker Part?
Guys, Trying to build K2 Noise Blanker. Have part in kit labeled 6n8J63. Missing part for C12 (.0068uF Disk or Monolithic Capacitor). Is Elecraft trying to use this 6n8J63 for C12? I looked up data sheets on the 6n8J63 and it is an inductor, ceramic prehaps wire wound. This can't be right? What gives? Any ideas? Hope some of you may have information. Trying to get Richard to call is very hit or miss! 73 mike-KB3QJA __ 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] K2 Noise Blanker Part?
.0068uF is 6.8nF. That capacitor labelled 6n8 is the right one (ignore the J63, which refer to the tolerance etc). 73 Dave G3YMC On 16 Jul 2011 at 0:44, vicki glover wrote: Guys, Trying to build K2 Noise Blanker. Have part in kit labeled 6n8J63. Missing part for C12 (.0068uF Disk or Monolithic Capacitor). Is Elecraft trying to use this 6n8J63 for C12? I looked up data sheets on the 6n8J63 and it is an inductor, ceramic prehaps wire wound. This can't be right? What gives? Any ideas? Hope some of you may have information. http://www.davesergeant.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] [K2] Noise Blanker problem
I am still getting the Not Installed message with the KNB2. I have built and re-built the board, rewinding L1 and L2 twice and resoldering all the joints again. Resistance between pins 1 and 6 is way up in the megohm range. What should it be?Any suggestions would be welcome. Brian KB1VBF http://home.comcast.net/~b.denley/index.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] [K2] Noise Blanker problem
Brian, A Not Installed indication for any K2 option indicates a problem with either that option's microprocessor or a continuity on the AUXBUS signal. Check the soldering, especially at the KNB2 firmware chip pin 1, as well as the other pins of the firmware chip. The other possibilities are the 4 MHz resonator or the firmware chip itself. 73, Don W3FPR On 1/29/2011 9:12 PM, Brian Denley wrote: I am still getting the Not Installed message with the KNB2. I have built and re-built the board, rewinding L1 and L2 twice and resoldering all the joints again. Resistance between pins 1 and 6 is way up in the megohm range. What should it be?Any suggestions would be welcome. Brian KB1VBF __ 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] [K2] Noise Blanker problem
Pat and Don: Thanks for the tips!! I will report back. Brian KB1VBF http://home.comcast.net/~b.denley/index.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] [K2] Noise Blanker
I wrote a week or so ago for some advice about testing my K2 noise blanker. From the replies I received (thank you), I now know that my blanker is probably working FB, but isn't well suited to blank the type of noise that plagues my QTH. So, I would like to ask anyone with the K2 DSP option if any of the noise reduction schemes implemented digitally are good at blotting out the type of I can't seem to get rid of. The noise I'm complaining about sounds a lot like the type of RF hash one might expect a noise blanker to get. In fact, I had a FT-450 that swatted this noise to nothing. I have the K2 audio filter module, but am wondering if the DSP module might improve my situation. I would appreciate any relies regarding how well the K2 DSP filter works compared to the analog filter. Doug K8EXB Share photos screenshots in seconds... TRY FREE IM TOOLPACK at http://www.imtoolpack.com/default.aspx?rc=if1 Works in all emails, instant messengers, blogs, forums and social networks. __ 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] [K2] Noise Blanker
Doug, I am not going to really answer your question, but give it some food for thought - most true Noise Blankers will not work on RF hash (which I would interpret as a frying noise mainly because it is too constant. If such a constant noise were to be blanked (the IF would be interrupted for the duration of the noise), then you would also kill reception. There are some radios with buttons labeled NB that do more of a noise reduction function rather than full blanking, and may be effective for those more constant types of noise. Yes, the KDSP2 does do Noise Reduction, and does it quite well. Whether it will handle your particular noise is to be determined. If you can find someone with a K2 equipped with the KDSP2, you would want to try it at your location to see if it will handle your noise. If you do borrow, you may want to try several of the variety of setting available on the KDSP2, so record your friends settings and restore them before you return the K2. Just a note - some users of the KDSP2 do not know that the noise reduction parameters can be adjusted, and they just use whatever the defaults are. You may need something different than the defaults, so some experimentation may be required. 73, Don W3FPR On 10/4/2010 9:00 PM, Douglas Furton wrote: I wrote a week or so ago for some advice about testing my K2 noise blanker. From the replies I received (thank you), I now know that my blanker is probably working FB, but isn't well suited to blank the type of noise that plagues my QTH. So, I would like to ask anyone with the K2 DSP option if any of the noise reduction schemes implemented digitally are good at blotting out the type of I can't seem to get rid of. The noise I'm complaining about sounds a lot like the type of RF hash one might expect a noise blanker to get. In fact, I had a FT-450 that swatted this noise to nothing. I have the K2 audio filter module, but am wondering if the DSP module might improve my situation. I would appreciate any relies regarding how well the K2 DSP filter works compared to the analog filter. Doug K8EXB __ 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] K2 noise blanker and sensitivity
Hi all, Speaking of the NB, mine is on the way now from Elecraft and I had a quick question. I read somewhere a long time ago (perhaps in the archives here of the reflector) that the NB module reduces the sensitivity of the RX in the K2. My questions are - if so, by how much (i.e. is it noticeable) - is it all the time, or only when the NB is enabled? Just curious, Tnx es 73, LS W5QD -- View this message in context: http://n2.nabble.com/K2-noise-blanker-and-sensitivity-tp4583421p4583421.html Sent from the [K2] 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] K2 noise
With so much talk on the K3 noise, AGC etc I thought I would ask if the following is normal on a K2. Or do I have an issue with my build 6732. This K2 has the KSUB SSB and KPA100 additions. With only battery power and ear phone connected; AGC off: AF fully clockwise; RF gain fully ccw; cw mode; fltr settings 200,400, or 700. any band, I hear a definite constant, fairly low level, hash. With RF gail fully clockwise and AF gain fully ccw, no hash is heard until AF gain is advanced from 7 o'clock to about 8 o'clock. Would this be considered normal or do I have another issue to look into? Best regards Dick AD1G __ 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] K2 noise
Dick, That is probably normal - you are hearing the internal receiver noise. It should be at a fairly low level - you said it was, but I can't relate to your perception of just how low or loud that may be. If you are using very sensitive headphones, it will be apparent at a lower setting of the AF Gain than would be heard with less sensitive headphones. All I can say for certain is that when I am working on a K2, I normally plug my computer Line-in cable into the headphone jack (mainly so I can see the trace on Spectrogram), and as a result I hear the K2 audio in the computer speakers - I can usually hear the internal receiver white noise 'hiss' with the AF Gain set somewhere near the 8 o'clock position - but I can change that point easily by adjusting the gain control on th epowered computer speakers. You said you had AGC off - and yes AGC can influence how loud the internal noise appears to be. In the K2 (after SN 3000), there is an AGC Threshold pot on the Control Board, and the most sensitive setting for that control is at the point where activating the AGC does not *substantially* reduce that internal receiver noise. It will reduce the internal noise a bit, and that exact threshold setting will vary from K2 to K2 - the initial 3.80 volt setting is not a one size fits all setting - the manual alludes to the fact that it could be refined by saying but it can be adjusted later to suite the operator. The manual does not further explain how to determine that setting. Be AWARE - the AGC Threshold must be set before adjusting the S-meter, and the S-meter must be calibrated after changing the Threshold. A Threshold setting below about 3.65 volts may not allow one to adjust the S-meter properly. 73, Don W3FPR richard gilley wrote: With so much talk on the K3 noise, AGC etc I thought I would ask if the following is normal on a K2. Or do I have an issue with my build 6732. This K2 has the KSUB SSB and KPA100 additions. With only battery power and ear phone connected; AGC off: AF fully clockwise; RF gain fully ccw; cw mode; fltr settings 200,400, or 700. any band, I hear a definite constant, fairly low level, hash. With RF gail fully clockwise and AF gain fully ccw, no hash is heard until AF gain is advanced from 7 o'clock to about 8 o'clock. Would this be considered normal or do I have another issue to look into? Best regards Dick AD1G __ 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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2665 - Release Date: 02/03/10 03:09:00 __ 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] K2 noise
Hi Dick, The KAF2 removes a lot of hf hash from the audio and makes listening to SSB much nicer. An essential module I would say and many prefer it over the more fancy and expensive KDSP2. Regards, Mike VP8NO - Original Message - From: richard gilley gille...@verizon.net To: elecraft@mailman.qth.net Sent: Wednesday, February 03, 2010 12:06 PM Subject: [Elecraft] K2 noise With so much talk on the K3 noise, AGC etc I thought I would ask if the following is normal on a K2. Or do I have an issue with my build 6732. This K2 has the KSUB SSB and KPA100 additions. With only battery power and ear phone connected; AGC off: AF fully clockwise; RF gain fully ccw; cw mode; fltr settings 200,400, or 700. any band, I hear a definite constant, fairly low level, hash. With RF gail fully clockwise and AF gain fully ccw, no hash is heard until AF gain is advanced from 7 o'clock to about 8 o'clock. Would this be considered normal or do I have another issue to look into? Best regards Dick AD1G __ 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] K2 noise
You did not say whether the PREamp was engaged. Without it, the internal noise is very low, and SHOULD be there to a mild degree. WITHOUT the preamp, AGC off, it takes to about noon for moderate noise audio. WITH the preamp, AGC off it takes to about 9 oclock for moderate noise audio. What I hear I call hiss, not hash. If you engage the preamp you will normally hear significantly more noise. This significantly more noise SHOULD be there. It's a preamp, and a quiet preamp is the holy grail. A good preamp will increase the noise as you hear it, but it will increase the signal more. People use widely varying words to describe noise. Here I would ask whether you are hearing hash versus hiss. Hiss sounds smooth but is noise. Hash as a noise has edgy or gritty components to it that are typically related to 60 Hz, 120 hz, or sometimes odd switching power supply. But on battery, as you describe, I hear only a hiss. At one point replacing the battery, I did something to the speaker (twisted it) where something was making contact as the cone vibrated, which added a hash-sounding element to speaker audio that was not in phones audio. I was able to twist it out. I have gotten hash off of a couple power supplies. Still the best and quietest is my ancient (20 years?) 3 amp Rak Shak 22-120A which powers the K2 with a trickle charge float voltage that keeps the battery topped off when K2 is off and will power 15 watts without complaint. 73, Guy On Wed, Feb 3, 2010 at 10:06 AM, richard gilley gille...@verizon.net wrote: With so much talk on the K3 noise, AGC etc I thought I would ask if the following is normal on a K2. Or do I have an issue with my build 6732. This K2 has the KSUB SSB and KPA100 additions. With only battery power and ear phone connected; AGC off: AF fully clockwise; RF gain fully ccw; cw mode; fltr settings 200,400, or 700. any band, I hear a definite constant, fairly low level, hash. With RF gail fully clockwise and AF gain fully ccw, no hash is heard until AF gain is advanced from 7 o'clock to about 8 o'clock. Would this be considered normal or do I have another issue to look into? Best regards Dick AD1G __ 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] K2 Noise Blanker Problem
Don Wilhelm wrote: First do a test to see if your NB is working at all. Remove the antenna, turn on the Preamp, then tap on the case of Q21 with a screwdriver. The taps will create impulse noise in the receiver which Has it actually been established that the problem noise is impulsive? One of the commonest problems with noise blanking is that people don't understand that it is only suitable for wideband, impulsive noise. -- David Woolley we do not overly restrict the subject matter on the list, and we encourage postings on a wide range of amateur radio related topics List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm __ 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] K2 Noise Blanker Problem
The K2 NB works very well with light-dimmer noise. If you have a light-dimmer to test it the results should be dramatic. 73, Drew AF2Z On Thu, 27 Aug 2009 13:20:22 -0700 (PDT), Eric WD6DB(lost in noise) wrote: I built my K2 some months back with the KNB2 option. The noise blanker has never been effective against any type of noise. The MCU recognizes the blanker, it draws the proper amount of current, but just doesn't seem to do anything. Before drinking the Kool-Aid (TM) I was pretty much a Kenwood man and was used to ineffective noise blankers so I ended up blowing it off. I recently built a K1, and the NB in it works FB. This got me thinking, and besides Elecraft would never release a NB that was useless--it violates the Tao of Elecraft. Yesterday I built another KNB2 (any excuse) and installed it in my K2. Same result! I checked all the solder joints, component values, RF board mods. It makes no difference whether it is NB1, NB2, HI or LO, the preamp is on or off--nothing. No change in S-meter reading, no change in audio. Any ideas, oh mighty brains? Thanks, Eric WD6DB(lost in noise) __ __ 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] K2 Noise Blanker Problem
I built my K2 some months back with the KNB2 option. The noise blanker has never been effective against any type of noise. The MCU recognizes the blanker, it draws the proper amount of current, but just doesn't seem to do anything. Before drinking the Kool-Aid (TM) I was pretty much a Kenwood man and was used to ineffective noise blankers so I ended up blowing it off. I recently built a K1, and the NB in it works FB. This got me thinking, and besides Elecraft would never release a NB that was useless--it violates the Tao of Elecraft. Yesterday I built another KNB2 (any excuse) and installed it in my K2. Same result! I checked all the solder joints, component values, RF board mods. It makes no difference whether it is NB1, NB2, HI or LO, the preamp is on or off--nothing. No change in S-meter reading, no change in audio. Any ideas, oh mighty brains? Thanks, Eric WD6DB(lost in noise) __ 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] K2 Noise Blanker Problem
I built my K2 some months back with the KNB2 option. The noise blanker has never been effective against any type of noise. The MCU recognizes the blanker, it draws the proper amount of current, but just doesn't seem to do anything. Before drinking the Kool-Aid (TM) I was pretty much a Kenwood man and was used to ineffective noise blankers so I ended up blowing it off. I recently built a K1, and the NB in it works FB. This got me thinking, and besides Elecraft would never release a NB that was useless--it violates the Tao of Elecraft. Yesterday I built another KNB2 (any excuse) and installed it in my K2. Same result! I checked all the solder joints, component values, RF board mods. It makes no difference whether it is NB1, NB2, HI or LO, the preamp is on or off--nothing. No change in S-meter reading, no change in audio. Any ideas, oh mighty brains? Thanks, Eric WD6DB(lost in noise) __ 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] K2 Noise Blanker Problem
I built my K2 some months back with the KNB2 option. The noise blanker has never been effective against any type of noise. The MCU recognizes the blanker, it draws the proper amount of current, but just doesn't seem to do anything. Before drinking the Kool-Aid (TM) I was pretty much a Kenwood man and was used to ineffective noise blankers so I ended up blowing it off. I recently built a K1, and the NB in it works FB. This got me thinking, and besides Elecraft would never release a NB that was useless--it violates the Tao of Elecraft. Yesterday I built another KNB2 (any excuse) and installed it in my K2. Same result! I checked all the solder joints, component values, RF board mods. It makes no difference whether it is NB1, NB2, HI or LO, the preamp is on or off--nothing. No change in S-meter reading, no change in audio. Any ideas, oh mighty brains? Thanks, Eric WD6DB(lost in noise) __ 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] K2 Noise Blanker Problem
Eric, First do a test to see if your NB is working at all. Remove the antenna, turn on the Preamp, then tap on the case of Q21 with a screwdriver. The taps will create impulse noise in the receiver which should be blanked when NB1 or NB2 is turned on. Be careful to differentiate between the clicks from the impulse noise and the rush of 'antenna/band noise' that happens because the screwdriver shaft can act as an antenna. If you find the NB is responding to that test, but it still does not help with your noise source, you can try widening the gate time a bit - try adding an additional .001 uF capacitor in parallel with C11 (just soleder ti to the solder pads for a test - if that helps, you can either leave the parallel cpacitor in place or change C11 to .002 uF. Other values may help as well, so some experimentation may be of help. If the noise gate is widened too much you will begin to notice holes on the received signal. 73, Don W3FPR eric norris wrote: I built my K2 some months back with the KNB2 option. The noise blanker has never been effective against any type of noise. The MCU recognizes the blanker, it draws the proper amount of current, but just doesn't seem to do anything. Before drinking the Kool-Aid (TM) I was pretty much a Kenwood man and was used to ineffective noise blankers so I ended up blowing it off. I recently built a K1, and the NB in it works FB. This got me thinking, and besides Elecraft would never release a NB that was useless--it violates the Tao of Elecraft. Yesterday I built another KNB2 (any excuse) and installed it in my K2. Same result! I checked all the solder joints, component values, RF board mods. It makes no difference whether it is NB1, NB2, HI or LO, the preamp is on or off--nothing. No change in S-meter reading, no change in audio. Any ideas, oh mighty brains? Thanks, Eric WD6DB(lost in noise) __ 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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.70/2329 - Release Date: 08/27/09 08:11:00 __ 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] k2 noise blanker
Brett, My K2 noise blanker is not doing a lot but there are a few modifications around, which can be found in the internet.I haven´t tried them yet... 73, Chris Brett Gazdzinski wrote: I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. I did remove the bypass jumper, but it does not act like it Is it supposed to be noticeable at all with it on? Brett N2DTS __ 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 -- View this message in context: http://n2.nabble.com/k2-noise-blanker-tp2403328p2403783.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] k2 noise blanker
Brett Gazdzinski wrote: I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. I did remove the bypass jumper, but it does not act like it Is it supposed to be noticeable at all with it on? Brett N2DTS __ 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 -- View this message in context: http://n2.nabble.com/k2-noise-blanker-tp2403328p2404133.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] k2 noise blanker
The K2's noise blanker likes lots of signal, even when you select low threshold. Sometimes switching the K2's preamp on makes the difference between no blanking at all and full noise suppression. Keep in mind that the blanker suppresses high amplitude, short duration pulses only, such as you hear on 10 meters from unshielded automobile ignition systems or on the lower bands from cheap lamp dimmers. If the noise doesn't make a loud buzz sound, it probably won't suppress it. But those noise types that it does suppress, it normally suppresses very, very well if the signals are strong enough. Ron AC7AC -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of OE5CSP-Chris Sent: Sunday, March 01, 2009 12:50 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] k2 noise blanker Brett, My K2 noise blanker is not doing a lot but there are a few modifications around, which can be found in the internet.I haven´t tried them yet... 73, Chris Brett Gazdzinski wrote: I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. I did remove the bypass jumper, but it does not act like it Is it supposed to be noticeable at all with it on? Brett N2DTS __ 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 -- View this message in context: http://n2.nabble.com/k2-noise-blanker-tp2403328p2403783.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] k2 noise blanker
Brett Gazdzinski wrote: I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. The noise blanker is effective on man-made noise or automobiles, NOT RF (white noise). Ron wb1hga __ 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] k2 noise blanker
ron wrote: Brett Gazdzinski wrote: I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. The noise blanker is effective on man-made noise or automobiles, NOT RF (white noise). What ever type of powerline noise I have at my home qth, My Kenwood TS-450's noise blanker eliminates it totally. The noise blanker in my K2 is totally ineffective on it. There have been other noises that the K2's NB has been able to quieten, but that is of no help with my powerline noise problem. P.S. Yes the power company has tried to find and fix it, so far no luck. They will be back at it in a few months, when I call them again. The Noise id temperature sensitive, when the sun heats something up it kicks in, when the night cools down it stops. Moving is not an option. P.P.S. Yes I have tried locating it, off the ends, with a rotateable dipole, no joy. P.P.S.S. Yes I have used an MFJ-1026 phasing unit, again no joy. -- GB 73 KA5OAI Sam Morgan __ 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] K2 noise blanker
I have tried it on various types of noises, some which sounded like auto ignition noise, I think someone had something running without resistor wires or plugs, strong and weak signals, no change. I did have a bad street light out front of my house, the reason I got the NB, but they fixed it before I got the noise blanker. The main reason I asked was there seems to be no degradation of signals with the NB on at any setting. On most rigs, you can hear a difference, and where its adjustable, it makes things sound really bad when you turn it up. The pro 3 is like that. On the K2, I have been unable to detect it doing anything at all, any mode, any noise, although the noise level I usually have is not bad. Thanks for the replies, Brett N2DTS __ 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] K2 noise blanker
Hi Brett, Last summer, I had similar questions about the KNB2 in my K2. In my case, a neighbor had put up a new electric fence and I was getting QRM in the form of a pulse every second. The unmodified KNB2 seemed to have little to no effect on the noise. In fact, I questioned whether it was working at all. A 'scrape test' (connecting a wire to the antenna connector and scraping it on some metal surface in the shack to generate static) indicated that it was indeed working. The modification described here http://www.dl7maj.de/KNB2-Mod.pdf seemed to improve the situation. After making the mod described, the KNB2 would partially take out the electric fence noise using the LEVEL LOW threshold. Not perfect, but better than it was. You can read the original thread by searching the list archives for the topic [K2] KNB2 vs. electric fence that started on August 3, 2008. 73 -- Joe KB8AP On Mar 1, 2009, at 2:18 PM, Brett Gazdzinski wrote: I have tried it on various types of noises, some which sounded like auto ignition noise, I think someone had something running without resistor wires or plugs, strong and weak signals, no change. I did have a bad street light out front of my house, the reason I got the NB, but they fixed it before I got the noise blanker. The main reason I asked was there seems to be no degradation of signals with the NB on at any setting. On most rigs, you can hear a difference, and where its adjustable, it makes things sound really bad when you turn it up. The pro 3 is like that. On the K2, I have been unable to detect it doing anything at all, any mode, any noise, although the noise level I usually have is not bad. Thanks for the replies, Brett N2DTS __ 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] K2 noise blanker
Joe, I will try this, thanks! Brett N2DTS - Original Message - From: Joe Planisky jp...@jeffnet.org To: Brett Gazdzinski brett.gazdzin...@verizon.net Cc: elecraft@mailman.qth.net Sent: Sunday, March 01, 2009 6:03 PM Subject: Re: [Elecraft] K2 noise blanker Hi Brett, Last summer, I had similar questions about the KNB2 in my K2. In my case, a neighbor had put up a new electric fence and I was getting QRM in the form of a pulse every second. The unmodified KNB2 seemed to have little to no effect on the noise. In fact, I questioned whether it was working at all. A 'scrape test' (connecting a wire to the antenna connector and scraping it on some metal surface in the shack to generate static) indicated that it was indeed working. The modification described here http://www.dl7maj.de/KNB2-Mod.pdf seemed to improve the situation. After making the mod described, the KNB2 would partially take out the electric fence noise using the LEVEL LOW threshold. Not perfect, but better than it was. You can read the original thread by searching the list archives for the topic [K2] KNB2 vs. electric fence that started on August 3, 2008. 73 -- Joe KB8AP On Mar 1, 2009, at 2:18 PM, Brett Gazdzinski wrote: I have tried it on various types of noises, some which sounded like auto ignition noise, I think someone had something running without resistor wires or plugs, strong and weak signals, no change. I did have a bad street light out front of my house, the reason I got the NB, but they fixed it before I got the noise blanker. The main reason I asked was there seems to be no degradation of signals with the NB on at any setting. On most rigs, you can hear a difference, and where its adjustable, it makes things sound really bad when you turn it up. The pro 3 is like that. On the K2, I have been unable to detect it doing anything at all, any mode, any noise, although the noise level I usually have is not bad. Thanks for the replies, Brett N2DTS __ 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] K2 noise blanker
Perhaps there's a comment from Elecraft on the K2's Noise Blanker Dick, K2ZR/4 Brett Gazdzinski wrote: Joe, I will try this, thanks! Brett N2DTS - Original Message - From: Joe Planisky jp...@jeffnet.org To: Brett Gazdzinski brett.gazdzin...@verizon.net Cc: elecraft@mailman.qth.net Sent: Sunday, March 01, 2009 6:03 PM Subject: Re: [Elecraft] K2 noise blanker Hi Brett, Last summer, I had similar questions about the KNB2 in my K2. In my case, a neighbor had put up a new electric fence and I was getting QRM in the form of a pulse every second. The unmodified KNB2 seemed to have little to no effect on the noise. In fact, I questioned whether it was working at all. A 'scrape test' (connecting a wire to the antenna connector and scraping it on some metal surface in the shack to generate static) indicated that it was indeed working. The modification described here http://www.dl7maj.de/KNB2-Mod.pdf seemed to improve the situation. After making the mod described, the KNB2 would partially take out the electric fence noise using the LEVEL LOW threshold. Not perfect, but better than it was. You can read the original thread by searching the list archives for the topic [K2] KNB2 vs. electric fence that started on August 3, 2008. 73 -- Joe KB8AP On Mar 1, 2009, at 2:18 PM, Brett Gazdzinski wrote: I have tried it on various types of noises, some which sounded like auto ignition noise, I think someone had something running without resistor wires or plugs, strong and weak signals, no change. I did have a bad street light out front of my house, the reason I got the NB, but they fixed it before I got the noise blanker. The main reason I asked was there seems to be no degradation of signals with the NB on at any setting. On most rigs, you can hear a difference, and where its adjustable, it makes things sound really bad when you turn it up. The pro 3 is like that. On the K2, I have been unable to detect it doing anything at all, any mode, any noise, although the noise level I usually have is not bad. Thanks for the replies, Brett N2DTS __ 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] K2 noise blanker
IMX with the K2 Noise Blanker there's little or no degradation of normal signals. However, it can produce intermod noise when strong signals are present. After all, it does punch holes in the signal where the noise pulses would normally be. That action makes the noise blanker a mixer as well which will produce artifacts. Some of them are recognizable as such. Some will merely sound like excess QRN. (That's why the NB has a switch. One doesn't want it on unless it needs to be on :-) Even so, I've not experienced significant intermod issues with the KNB2 but I don't live close to any high powered stations either. There are several technical articles on the Elecraft site that might give you some ideas. One of the early Elecraft customers, Sverre Holm, LA3ZA, put together a wonderful page of K2 mods with links to the various documents. Check here for info about the KNB2: http://www.qslnet.de/member/la3za/K2/modAny.html#KNB2 I've seen some references to various ways to test your noise blanker over time. I didn't explore them because I had a test of my own: I own a lamp with a cheap dimmer. The KNB2 kills the racket completely when it must be on. Fortunately, I also own the lamp and can turn it off! Also might post a query to supp...@elecraft.com 73, Ron AC7AC -Original Message- I have tried it on various types of noises, some which sounded like auto ignition noise, I think someone had something running without resistor wires or plugs, strong and weak signals, no change. I did have a bad street light out front of my house, the reason I got the NB, but they fixed it before I got the noise blanker. The main reason I asked was there seems to be no degradation of signals with the NB on at any setting. On most rigs, you can hear a difference, and where its adjustable, it makes things sound really bad when you turn it up. The pro 3 is like that. On the K2, I have been unable to detect it doing anything at all, any mode, any noise, although the noise level I usually have is not bad. Thanks for the replies, Brett N2DTS __ 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] k2 noise blanker
Brett, To induce a noise that your KNB2 *should* blank, turn on the preamp and tap on Q21 with a metal screwdriver - the clicks should disappear with the NB on, which will tell you that your KNB2 is working. If the noise blankiing is not effective with the particular noise you are dealing with, you can try widening the gate pulse by placing an additional capacitor in parallel with C11. I would suggest .001 for starters, but increase that to whatever your noise source demands. BUT, consider that an increased gate time will cut wider holes on your received signal, so there is a compromise between a gate time that defeats the noise and good receive audio - if the audio distortion is too great, then back off on the added capacitance value. 73, Don W3FPR Brett Gazdzinski wrote: I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. I did remove the bypass jumper, but it does not act like it Is it supposed to be noticeable at all with it on? Brett __ 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] k2 noise blanker
I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. I did remove the bypass jumper, but it does not act like it Is it supposed to be noticeable at all with it on? Brett N2DTS __ 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] k2 noise blanker
The noise blanker on my K2 is _very_ effective at eliminating the power-line noise in the area. Many time with it off the noise level is around S9 or higher and unless signals are very loud I just can't hear them. Turn on the NB, and the noise disappears and I hear signals. When I first got the K2 with the NB several years ago I had the same questions as you. Then the power-line noise problems started, and I quickly found out. I just wish whoever is responsible for the PL noise would be just as responsive in getting rid of them... I haven't found the setting yet for the K3 blankers that provide the same effect, but it should be there. Keep looking at various periodic noise environments, you will find a use for the blanker. On Feb 28, 2009, at 8:22 PM, Brett Gazdzinski wrote: I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. I did remove the bypass jumper, but it does not act like it Is it supposed to be noticeable at all with it on? Brett N2DTS __ 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 -Jack Brindle, W6FB === __ 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] k2 noise blanker
Hi Brett, I don't have a K2, but I do have a K3. At first I too thought that my NB board wasn't working, but after tuning around a few bands, I did find some electrical hash that the NB removed right away. 73, James KC2UEE -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brett Gazdzinski Sent: Saturday, February 28, 2009 11:23 PM To: elecraft@mailman.qth.net Subject: [Elecraft] k2 noise blanker I have the noise blanker in my K2, and I have yet to find a noise it does anything with. It seems to have no impact at all on the receiver, no matter what settings. I did remove the bypass jumper, but it does not act like it Is it supposed to be noticeable at all with it on? Brett N2DTS __ 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] k2 noise blanker
Jack, On the K3, hold down the NB button until you see the DSP menu. Rotating VFO A will change the DSP settings while rotating VFO B will change the IF settings. When I come across power line noise for example, I'll usually set the IF setting to NAR1 and adjust the DSP setting until the noise usually goes away. 73, James KC2UEE -Original Message- I haven't found the setting yet for the K3 blankers that provide the same effect, but it should be there. __ 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] K2 Noise Solved
A few weeks back I wrote that I was experiencing a most unusual noise problem. I had hoped that someone else might have had the same problem and would have the answer. This didn't happen. The noise was noticeable when the volume control and RF Gain were at minimum and even the antenna disconnected. I want to thank Gary, KI4GGX, who was of great encouragement to me is the solving of this problem. He even suggested I record the noise. I did and sent it to him to hear. I finally decided to use the bruit force approach and used a 1000 UF capacitor with one side grounded. Starting at U9 the audio amp, shorting leads to ground through the capacitor, I discovered the noise was coming in via the CW side tone path. I traced the noise to the input to U 10B pin 5. Under a high intensity light and a magnifying glass, all solder pads looked clean and shiny. Not knowing where else to go, I resoldered all the pins of U10 plus C36. I suspect C36 may have been my problem but all that noise has now gone away. Don Webb...KA7L **Gas prices getting you down? Search AOL Autos for fuel-efficient used cars. (http://autos.aol.com/used?ncid=aolaut000507) ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise Solved
Don, I have a strong suspicion that the solder pad did not receive enough heat initially. It can happen that the solder looks nice and shiny, but the solder does not have good flow onto the pad. I have seen that condition more times than I would like. It is the result of too low a soldering temperature. A word to potential builders - keep the soldering iron temperature greater than 700 deg F (750 is better). You will not damage anything if the soldering temperature is 800 deg F or below *and* the soldering time is kept short - contrary to popular belief, damage *will* occur with a low iron temperature applied for a long period of time. Also use a small diameter solder so you can control the amount and watch as the thru-hole is heated, it will wick a bit of solder into the hole when it receives adequate heat, but too much applied solder will mask that process and can hide a bad solder joint. 73, Don W3FPR [EMAIL PROTECTED] wrote: A few weeks back I wrote that I was experiencing a most unusual noise problem. I had hoped that someone else might have had the same problem and would have the answer. This didn't happen. The noise was noticeable when the volume control and RF Gain were at minimum and even the antenna disconnected. I want to thank Gary, KI4GGX, who was of great encouragement to me is the solving of this problem. He even suggested I record the noise. I did and sent it to him to hear. I finally decided to use the bruit force approach and used a 1000 UF capacitor with one side grounded. Starting at U9 the audio amp, shorting leads to ground through the capacitor, I discovered the noise was coming in via the CW side tone path. I traced the noise to the input to U 10B pin 5. Under a high intensity light and a magnifying glass, all solder pads looked clean and shiny. Not knowing where else to go, I resoldered all the pins of U10 plus C36. I suspect C36 may have been my problem but all that noise has now gone away. Don Webb...KA7L ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise Solved
Don: I can't find it now, but I remember a column by Robert A. Pease in which he left a transistor wrapped around the business end of a soldering iron at 700F over the weekend as an experiment and found that its performance specs were still in compliance when he checked it Monday morning. A related issue to tip temperature is that a physically small tip will loose too much heat. There's a happy optimum where the tip possesses sufficient thermal mass to not cool down when applied to the joint, but is sufficiently small for the job. Jack K8ZOA A word to potential builders - keep the soldering iron temperature greater than 700 deg F (750 is better). You will not damage anything if the soldering temperature is 800 deg F or below *and* the soldering time is kept short - contrary to popular belief, damage *will* occur with a low iron temperature applied for a long period of time. Also use a small diameter solder so you can control the amount and watch as the thru-hole is heated, it will wick a bit of solder into the hole when it receives adequate heat, but too much applied solder will mask that process and can hide a bad solder joint. 73, Don W3FPR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise
I may have had a similar noise in my K-2 and had finally traced it to running Ham Radio Deluxe while using an external speaker. If I shut down HRD the noise would go away, BUT with HRD on and using the internal speaker on the K-2 it was not there. I traced it to computer noise getting into the speaker because of poor shielding of the external speaker leads. Hope this helps: 73 DDWEBB wrote: I am hearing low level random noise from my K2, I hear it from speaker or head phones as well and even when volume and RF controls are all CCW and the antenna is disconnected. I even hear it when I am in transmit mode. Any suggestions as to where to start looking. I hate the thought of removing the LM380n from the control board and finding I have a bad capacitor some where else. Don...KA7L S/N 1175. REV B **Get trade secrets for amazing burgers. Watch Cooking with Tyler Florence on AOL Food. (http://food.aol.com/tyler-florence?video=4?NCID=aolfod000302) ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- View this message in context: http://www.nabble.com/K2-Noise-tp17480232p17497695.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 Noise Blanker XG1
I have been playing catch up with my K2 (#436) and recently installed the A - B mods as well as adding the KAF2 AND KNB2 options. All was well until I added the KNB2 option. When I added the KNB2 option, I noticed that my output levels had dropped. I then discovered that I had forgot to change the resistors on the RF board. Once that was done, I had improved audio, but the S-meter is reading low. With the KNB2 installed and the pre-amp on, I get about an S3 when I am tuned to the XG1 generator signal set to 50 microvolts. If I bypass the KNB2 by shorting pins 1 to 6 on J12, I get the full S9 reading. I have pulled C8 to isolate the bandpass filter and my S-meter readings remain at S3. Is this normal or might I have a problem with the bandpass filter. Thanks in advance for your help. 73, Bob Scott W4ZY Woodbridge, VA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2 noise blanker
Sometimes turning on the preamplifier makes a world of difference, even when low threshold is selected. I realize that the preamplifier is not needed on the lower frequency bands and normally would be turned off to preserve the dynamic range of the receiver. But this is a case where raising the overall signal levels above normal helps the KNB2 to suppress the noise much better. In my experience it often brings otherwise inaudible stations up to Q5 copy. I've not been following the thread. My apologies if others have already mentioned this. Ron AC7AC -Original Message- Many thanks for all the suggestions! Since it is easier and quicker to take the radio to a dimmer switch than it is to remove the covers and scratch the top of a transistor, I shall do that first! I am beginning to think that I was expecting too much from the circuit, and that being elecraft it would somehow squeeze the laws of physics a bit! 73 Stephen G4SJP ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 noise blanker
When I first completed the K2 with the noise blanker option and ran some tests, I also expected to hear more of a difference in backround noise reduction. Unless it is repetitive pulse noise the blanker has no audible effect which is good in some respects compared to other receivers like the Icom 706 noise blanker which can needlessly distort the reception of strong signals. The blanker is very effective in eliminating lamp dimmer noise, and once I heard the difference it put my mind to rest that the circut which I assembled was working properly. GL 73, Bob Johansen WB2SRF Staten Island, NY USA K2 S/N 5622 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 Noise blanker- is it working?
I built the noise blanker kit for my K2 s/no. 4905 (I think) a few weeks back, and I am beginning to wonder if it is working. I can not tell any difference between NB1, NB2, whether hi or lo threshold. It is said that it works against the sort of pulse noise I get here from power lines occasionally, yet it makes no difference. Since all the cars in the family are diesel powered and I am some distance from a quiet country road, I have not had the opportunity to see whether it works on petrol engined ignition noise. My experience with noise blankers in other radios is that you can usually hear some change when it is switched in, but I don't. Am I expecting too much? Or could there possibly be a fault which would still pass the rx signal through the noise blanker board and yet stop the noise blanker working? Had I not read how good it is supposed to be, and had I not made it myself, I probably would not be asking the question! Thanks 73 Stephen G4SJP ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 Noise blanker- is it working?
The best way I have used to test the effectiveness of noise blanker is try to use the radio in a house with a common incandescent lamp dimmer nearby the antenna connection. Use a wire antenna placed near the lamp or wiring of the dimmer circuit if necessary to increase the coupled noise. The power line frequency zero crossing pulse width modulator (severe contant buzzing sound) of the lamp dimmer noise will be almost completely supressed if the noise blanker circuit is working properly GL 73, Bob Johansen WB2SRF K2 S/N 5622 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise blanker- is it working?
Another good source of in-home switching hash is the ubiquitous external low-voltage halogen lamp power supply. In my experience, some of them are completely quiet, some of them are anything but. If you have one of the latter, though, you probably already know that. :-) Bill / W5WVO [EMAIL PROTECTED] wrote: The best way I have used to test the effectiveness of noise blanker is try to use the radio in a house with a common incandescent lamp dimmer nearby the antenna connection. Use a wire antenna placed near the lamp or wiring of the dimmer circuit if necessary to increase the coupled noise. The power line frequency zero crossing pulse width modulator (severe contant buzzing sound) of the lamp dimmer noise will be almost completely supressed if the noise blanker circuit is working properly GL 73, Bob Johansen WB2SRF K2 S/N 5622 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise blanker- is it working?
Stephen, Turn the preamp on and scratch/tap the Q21 case with a metallic object (screwdriver) while turning the NB on and off. If the NB is working, you will hear the sharp impulse clicks substantially reduced. Many types of power line noise are not handled by the KNB2, it is great on impulse noise, such as that from an automobile engine (not diesel). The KDSP2 does a good job on many other types of noise. 73, Don W3FPR Stephen Prior wrote: I built the noise blanker kit for my K2 s/no. 4905 (I think) a few weeks back, and I am beginning to wonder if it is working. I can not tell any difference between NB1, NB2, whether hi or lo threshold. It is said that it works against the sort of pulse noise I get here from power lines occasionally, yet it makes no difference. Since all the cars in the family are diesel powered and I am some distance from a quiet country road, I have not had the opportunity to see whether it works on petrol engined ignition noise. My experience with noise blankers in other radios is that you can usually hear some change when it is switched in, but I don't. Am I expecting too much? Or could there possibly be a fault which would still pass the rx signal through the noise blanker board and yet stop the noise blanker working? Had I not read how good it is supposed to be, and had I not made it myself, I probably would not be asking the question! ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 noise blanker
Many thanks for all the suggestions! Since it is easier and quicker to take the radio to a dimmer switch than it is to remove the covers and scratch the top of a transistor, I shall do that first! I am beginning to think that I was expecting too much from the circuit, and that being elecraft it would somehow squeeze the laws of physics a bit! 73 Stephen G4SJP ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise Blanker performance
I just installed one in my K2. I tested it by turning on a light dimmer switch on the other side of the house which generates an S5 noise level on 80m. The K2NB totally eliminated it. 73, Drew AF2Z On Thu, 03 May 2007 04:02:42 +, you wrote: I finished K2 #5665 a few weeks ago and have read the discussions about how well the K2NB does or doesn't work. I'm in an RV on a bluff on the Oregon Coast and we've just had a thunder storm (with hail) pass over. The tip of the screwdriver antenna's whip produced a few minutes of strong precipitation static, similar to ignition noise that the noise blanker TOTALLY eleminated. It was a good test for the K2's NB ... for this kind of noise, at least ... and it worked GREAT! 73! Ken Kopp - K0PP K2 #5665 - K3#_ [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 Noise Blanker performance
I finished K2 #5665 a few weeks ago and have read the discussions about how well the K2NB does or doesn't work. I'm in an RV on a bluff on the Oregon Coast and we've just had a thunder storm (with hail) pass over. The tip of the screwdriver antenna's whip produced a few minutes of strong precipitation static, similar to ignition noise that the noise blanker TOTALLY eleminated. It was a good test for the K2's NB ... for this kind of noise, at least ... and it worked GREAT! 73! Ken Kopp - K0PP K2 #5665 - K3#_ [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2 noise
Hans, That effect can happen if your IF filter alignment is way off. I suggest aligning the filters using Spectrogram. See the information for doing that on the Builders Resouce section of the Elecraft website or look at the K2 Dial Calibration article on my website http://w3fpr.qrpradio.com . When you are finished aligning the filters, you can observe the AF content of an actual received signal with Spectrogram and determine if you still have a problem. 73, Don W3FPR -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Hans Johansson Sent: Wednesday, January 10, 2007 4:34 PM To: elecraft@mailman.qth.net Subject: [Elecraft] K2 noise I have a problem with my K2. When I am listening to CW-signals at my beatnote 700 Hz everything is OK. But when I tune to higher or lower pitch it comes noise on the signal.It is more noticeable on strong signals than on weak ones. I wonder if anyone have had this problem and have any suggestions of solution or is it a shortcoming of the K2 ? (Perhaps VCO noise). I have no transformer in the neighborhood of the K2. 73 de Hans SM6BGA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.16.8/621 - Release Date: 1/9/2007 1:37 PM -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.16.8/621 - Release Date: 1/9/2007 1:37 PM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 noise
I have a problem with my K2. When I am listening to CW-signals at my beatnote 700 Hz everything is OK. But when I tune to higher or lower pitch it comes noise on the signal.It is more noticeable on strong signals than on weak ones. I wonder if anyone have had this problem and have any suggestions of solution or is it a shortcoming of the K2 ? (Perhaps VCO noise). I have no transformer in the neighborhood of the K2. 73 de Hans SM6BGA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2 Noise Blanker Slot as Additional IF Amplifier S tage
Dick, If your filters are adjusted correctly (best done using Spectrogram, as others have mentioned), it may be that you're not tuning the CW signal to the center of the filter's band pass (usually set to 600Hz). I recently added a CW tuning indicator to my K2, and now, once the indicator shows that the CW signal is centered at 600HZ, I can switch to any of the much narrower XTAL or DSP filters and the signal is always right there. To avoid the slight reduction in signal level with the narrowest XTAL filters, I have my narrowest XTAL filter set to 300Hz and when needed, then use my narrowest DSP filter, which is set to 100Hz. 73, Bob W1SRB -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Lemkes Sent: Friday, August 11, 2006 10:58 PM To: elecraft@mailman.qth.net Subject: [Elecraft] K2 Noise Blanker Slot as Additional IF Amplifier Stage Has anyone thought of, or tried modifying the K2 Noise Blanker to be an additional K2 IF amplifier stage? My problem is that when I really, really need the crystal filter, I am trying to copy a very weak (but readable) CW signal with adjacent S-9 QRM. When I switch in tighter than about 1200 Hz of crystal filtering, I tend to lose the target signal due to filter loss. ( Losing the target signal is not because the BFOs are not properly calibrated). When I use just the DSP filter to block the adjacent S-9 QRM, then I still lose the target DX due to AGC pumping (without the IF roofing filter). I'd really like some additional IF gain to compensate for the crystal filter loss. I would try using the Noise Blanker's U1, MC1350, as the added IF stage, and use U3, the Controller's decoded program lines to adjust U1's AGC input for front panel gain control. I could use P1's pin 8, 8R, as power for the MC1350 so that it's only active on receive. Any feedback would be appreciated. 73, Dick, AD7AF Dick and Marty Lemke PO Box 1038 Ocean Park, WA 98640 Tel. 360-665-2438 www.lemkestudios.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2 Noise Blanker Slot as Additional IF Amplifier Stage
Hi Dick, The variable crystal filters in the K2 are very good. In fact the best I have ever used. As Don says, unless you have a bad component, crystal filtering should be excellent down to about 250 Hz, and the DSP down to 100 Hz before you get a bit of attenuation of signal. You can even boost the volume a bit in the DSP adjustments. I originally had similar problems to you when I first built the rig in 1999. Now I use MixW to check the filters visually. You can also use Spectrogram. Pictures don't lie. I have some MixW screens shots on my website here. I think it would be hard to get these kind of results with most other ham transceivers. http://users.ev1.net/~spituch/Steve's%20Page/Radio/RTTY/RTTY.html From the photos alone the performance of the filters look phenomenal. If you adjust the filters while looking at the MixW screen you can get instant feedback on the adustments you are making and easily adjust the filters perfectly. Centering the filters this way is a snap. One of the reasons for the great popularity of the K2 is that you don't need to add any filters. Regards, Steve, W2MY -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.10.9/416 - Release Date: 8/10/2006 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 Noise Blanker Slot as Additional IF Amplifier Stage
Has anyone thought of, or tried modifying the K2 Noise Blanker to be an additional K2 IF amplifier stage? My problem is that when I really, really need the crystal filter, I am trying to copy a very weak (but readable) CW signal with adjacent S-9 QRM. When I switch in tighter than about 1200 Hz of crystal filtering, I tend to lose the target signal due to filter loss. ( Losing the target signal is not because the BFOs are not properly calibrated). When I use just the DSP filter to block the adjacent S-9 QRM, then I still lose the target DX due to AGC pumping (without the IF roofing filter). I'd really like some additional IF gain to compensate for the crystal filter loss. I would try using the Noise Blanker's U1, MC1350, as the added IF stage, and use U3, the Controller's decoded program lines to adjust U1's AGC input for front panel gain control. I could use P1's pin 8, 8R, as power for the MC1350 so that it's only active on receive. Any feedback would be appreciated. 73, Dick, AD7AF Dick and Marty Lemke PO Box 1038 Ocean Park, WA 98640 Tel. 360-665-2438 www.lemkestudios.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2 Noise Blanker Slot as Additional IF Amplifier Stage
Dick, Not an IF amplifier stage, but an added IF filter - check out http://homepages.nildram.co.uk/%7Ebaker/K2_Overview.html to see if that might address your stated needs. If you have filter loss at bandwidths less than 1200 Hz, then I would conclude that you have something wrong with your filter - the filter typically does not show attenuation until the bandpass is reduced to less than 200 Hz. If you are certain your BFO frequencies are correct (the filter peak is centered on your sidetone pitch), you should not experience attenuation at reasonable filter widths - if you do, I would suspect that you have a bad crystal in the filter. 73, Don W3FPR -Original Message- Has anyone thought of, or tried modifying the K2 Noise Blanker to be an additional K2 IF amplifier stage? My problem is that when I really, really need the crystal filter, I am trying to copy a very weak (but readable) CW signal with adjacent S-9 QRM. When I switch in tighter than about 1200 Hz of crystal filtering, I tend to lose the target signal due to filter loss. ( Losing the target signal is not because the BFOs are not properly calibrated). When I use just the DSP filter to block the adjacent S-9 QRM, then I still lose the target DX due to AGC pumping (without the IF roofing filter). I'd really like some additional IF gain to compensate for the crystal filter loss. I would try using the Noise Blanker's U1, MC1350, as the added IF stage, and use U3, the Controller's decoded program lines to adjust U1's AGC input for front panel gain control. I could use P1's pin 8, 8R, as power for the MC1350 so that it's only active on receive. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise Blanker Problem (Feature?)
Hi Harvey, This is for you. As I said before on this list, If you are having QRN, try turning on the KNB2. On some types, particularly anoying kind kind that sounds like frying bacon, it works superbly. But it doesn't work for all kinds of QRN in my experience. No noise blanker does. I always try changing the threshhohd as well. Most of the time I notice no change, but sometimes it makes the difference between being able to copy a signal and not. Of course, this assumes that your KNB2 is correctly built. 73, John (W2GW) - Original Message - From: Harvey Howell [EMAIL PROTECTED] To: Bob Patten [EMAIL PROTECTED]; [EMAIL PROTECTED]; Elecraft Reflector elecraft@mailman.qth.net; Lyle Johnson [EMAIL PROTECTED] Sent: Sunday, April 09, 2006 8:51 PM Subject: Re: [Elecraft] K2 Noise Blanker Problem (Feature?) Hi Bob. I tried switching the NB threshold and it has no effect on the NR on my K2 s/n 5022. Harvey KN6VP - Original Message - From: Bob Patten [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Elecraft Reflector elecraft@mailman.qth.net; Lyle Johnson [EMAIL PROTECTED] Sent: Sunday, April 09, 2006 10:44 AM Subject: [Elecraft] K2 Noise Blanker Problem (Feature?) Hi Gary, I finally discovered what the NB was doing on every other threshhold change. What I had perceived as a drop in level was actually the DSP Noise Reduction being turned on and off. Each time the NB is switched from low to high threshhold, the DSP NR is either turned on or off depending on its present state. I guess I should consider this a bonus, since I only have to push one key (albeit twice) for NR instead of pushing Display and Band+. Now though, I'm wondering if this behaviour is unique to my K2 or if any with both Noise Blanker and DSP installed exhibit the same? You said you didn't hear any change on yours when cycling NB threshhold, but did that K2 also have DSP installed? I'll post this to the list also - maybe someone else can verify whether this is unique to mine or common to all... -- 73, Bob Patten, N4BPPlantation, FL E-Mail: [EMAIL PROTECTED] Website: http://www.qsl.net/n4bp QRP ARCI #3412SOC #1ARS #799SMIRK #6625 FISTS #7871 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise Blanker Problem (Feature?)
Hi Bob. I tried switching the NB threshold and it has no effect on the NR on my K2 s/n 5022. Harvey KN6VP - Original Message - From: Bob Patten [EMAIL PROTECTED] To: [EMAIL PROTECTED]; Elecraft Reflector elecraft@mailman.qth.net; Lyle Johnson [EMAIL PROTECTED] Sent: Sunday, April 09, 2006 10:44 AM Subject: [Elecraft] K2 Noise Blanker Problem (Feature?) Hi Gary, I finally discovered what the NB was doing on every other threshhold change. What I had perceived as a drop in level was actually the DSP Noise Reduction being turned on and off. Each time the NB is switched from low to high threshhold, the DSP NR is either turned on or off depending on its present state. I guess I should consider this a bonus, since I only have to push one key (albeit twice) for NR instead of pushing Display and Band+. Now though, I'm wondering if this behaviour is unique to my K2 or if any with both Noise Blanker and DSP installed exhibit the same? You said you didn't hear any change on yours when cycling NB threshhold, but did that K2 also have DSP installed? I'll post this to the list also - maybe someone else can verify whether this is unique to mine or common to all... -- 73, Bob Patten, N4BPPlantation, FL E-Mail: [EMAIL PROTECTED] Website: http://www.qsl.net/n4bp QRP ARCI #3412SOC #1ARS #799SMIRK #6625 FISTS #7871 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.4.0/305 - Release Date: 4/8/2006 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2, Noise Gen and Spectrogram
James, A noise source (NG1 will do nicely) and Spectrogram are all that is required (ignoring the cable to connect the K2 to the sound card input). Take a look at the K2 Dial Calibration article on my webpage http:/w3fpr.qrpradio.com for the information you seek. If you want to bypass all the information contained there about setting the reference oscillator, just skip to Step 3, Cal FIL. There are links to additional information should you need it. There is also information on the Elecraft website - look in the Builder's Resources pages. 73, Don W3FPR -Original Message- I need to set my K2 Filters. After I had changed one of my chips a few years ago, I know by operating my K2 that the filters are 'off' and need to be reset. I had forgotten about it until this Field Day when my K2 was promptly removed from the table when the filter problem was 'found'. My friend previously set them originally using a noise generator and spectrogram. How is this done? Is spectrogram and a noise generator all I need? I just ordered the Elecraft NG1.. will this suffice along with Spectrogram? Does someone have a nice written web page or technical archive on using spectrogram with any kind of noise generator? Thanks! -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.323 / Virus Database: 267.8.2/29 - Release Date: 6/27/2005 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2, Noise Gen and Spectrogram
Hello James, The noise generator and spectrogram will do the job! Look at the www.n0ss.net webpage and you will find the article and downloadable software including instructions! With me, it worked. Good luck, Evert, PA2KW, K2 #4836 James Kern wrote: I need to set my K2 Filters. After I had changed one of my chips a few years ago, I know by operating my K2 that the filters are 'off' and need to be reset. I had forgotten about it until this Field Day when my K2 was promptly removed from the table when the filter problem was 'found'. My friend previously set them originally using a noise generator and spectrogram. How is this done? Is spectrogram and a noise generator all I need? I just ordered the Elecraft NG1.. will this suffice along with Spectrogram? Does someone have a nice written web page or technical archive on using spectrogram with any kind of noise generator? Thanks! James, KB2FCV ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2, Noise Gen and Spectrogram
Your URL seems not to work. I located your page at http://www.qsl.net/w3fpr/index.htm. Should the other work as well? On Mon, 27 Jun 2005 16:00:30 -0400, W3FPR - Don Wilhelm [EMAIL PROTECTED] wrote: Take a look at the K2 Dial Calibration article on my webpage http:/w3fpr.qrpradio.com for the information you seek. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2, Noise Gen and Spectrogram
James, Sometimes in addition to a noise generator and a PC with a soundcard running Spectrogram you may need to add a 600 ohm 1:1 isolation transformer between the LS output of the K2 and the PC sound card input. Perhaps I was unfortunate in that both my PC and a separate laptop had spikes on the display from harmonics of the AC power frequency. In the UK we use 50Hz AC power so that was present as a very large spike followed by 150Hz and every 100Hz after that through the audio spectrum. With your use of 60Hz AC power in the USA would possibly expect that plus multiples through the audio test range if afflicted. The use of an audio isolation transformer killed these spikes stone dead. Don, W3FPR suggested the audio transformers from scrap PC modem cards as a possible source of suitable 600 ohm transformers. The Spectrogram program turned out to have other uses for me beyond checking K2s. Having done a hurried rebuild on a 2m repeater for a semi local repeater group, when installed on site the through audio was poor and sounded muffled. With the aid of a VHF noise generator plus my laptop running Spectrogram was able to follow the audio through from the repeater RX audio output, through the logic and right up to the TX modulator. Apart from the normal RX de-emphasis and the blocking of the audio below 300Hz in the logic to remove the incoming CTCSS, the audio was correct right the way through the system. The problem in the end turned out to be the TX modulation pre-emphasis was not functioning. No doubt there are many other uses for the Spectrogram program, but on this occasion saved me a lot of time in fault finding on the repeater. Bob, G3VVT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2 Noise Blanker Modifications
It works now, so I think it is just the usual qsl.net problems. This is why I have mirrored my mods list on qslnet.de . Try http://www.qslnet.de/la3za/K2/mod.html http://www.qslnet.de/la3za/K2/mod.html under General mods and KNB2. 73 Sverre LA3ZA http://www.qsl.net/la3za/ _ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: 17. november 2004 02:21 To: [EMAIL PROTECTED]; elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 Noise Blanker Modifications Hi Sverre, The link to VE3MCF for the mod to increase KNB2 time constant does not seem to work anymore. Any other source of the mod details for suggested values for C11/C12? Regards, Bob, G3VVT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2 Noise Blanker Modifications
Did you get a reply to your question? In case you did not, there were some noise blanker mods for pulse widths a long time ago. They can also be found on the K2 Mods list, see http://www.qslnet.de/la3za/K2/mod.html under General mods and KNB2. 73 Sverre LA3ZA http://www.qsl.net/la3za/ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ralph McClintock Sent: 9. november 2004 11:56 To: elecraft@mailman.qth.net Subject: [Elecraft] K2 Noise Blanker Modifications Hello, Does anyone have any ideas about level and pulse width modifications for the K2 Noise Blanker. My problem is neighbors electric fences and corrals. They were built with aluminum, copper and steel wire intermixed and have over 300 twisted connections. I have replaced the old solenoid type pulser with a solid state unit. The pulsing is not even touched by the KNB2 in any configuration eventhough they are about 40db over 9. I can tell the NB2/LWR position is working but does not do anywhere near what is required. On 160-40 my primary bands of interest it's really bad. Tnx 73's, Ralph W1ZK Vermont ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2 Noise Blanker Modifications
Hi Sverre, The link to VE3MCF for the mod to increase KNB2 time constant does not seem to work anymore. Any other source of the mod details for suggested values for C11/C12? Regards, Bob, G3VVT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 Noise Blanker Modifications
Hello, Does anyone have any ideas about level and pulse width modifications for the K2 Noise Blanker. My problem is neighbors electric fences and corrals. They were built with aluminum, copper and steel wire intermixed and have over 300 twisted connections. I have replaced the old solenoid type pulser with a solid state unit. The pulsing is not even touched by the KNB2 in any configuration eventhough they are about 40db over 9. I can tell the NB2/LWR position is working but does not do anywhere near what is required. On 160-40 my primary bands of interest it's really bad. Tnx 73's, Ralph W1ZK Vermont ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
