k2 noise blanker
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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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Brett Gazdzinski
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: [hidden email] [mailto:[hidden email]] On Behalf Of Brett Gazdzinski Sent: Saturday, February 28, 2009 11:23 PM To: [hidden email] 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:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
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In reply to this post by Jack Brindle
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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
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I just shut down the station by "pulling the big switch" and then turned it
back on soon after. Of course I had to push the power button on the K3 to get it going again. Then I noticed what I never noticed before: The K3, while still tuned to the same 40m cw frequency, came up in LSB mode, with coarse frequency display. I pushed FINE and MODE DOWN to get back to cw and two decimals. Then I shut down the same way again, with the same result. Next time I powered down by pushing the K3 power button instead of the Big Switch. This time when I powered the K3 on again it remembered all settings. Looks to me like the K3 doesn't store all settings unless its power switch is pushed to shut down. Is this how it is supposed to work? I am running 2.76. 73, Erik K7TV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Brett Gazdzinski
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
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In reply to this post by Brett Gazdzinski
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In reply to this post by K7TV
> Next time I powered down by pushing the K3 power button instead of the Big
> Switch. This time when I powered the K3 on again it remembered all settings. > Looks to me like the K3 doesn't store all settings unless its power switch > is pushed to shut down. Is this how it is supposed to work? The K3 is designed to be turned off by pressing its front panel switch. It then performs a series of "shutting down" housekeeping tasks in an orderly fashion. If you arbitrarily remove power, it may or may not have all your latest front panel settings stored in non-volatile memory. 73, Lyle KK7P ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by K7TV
What you experienced is not a bug. Do you turn off your PC by unplugging
it? The K3 has a CPU in it, and in order to clean up and go to a power down state, it needs to be RUNNING to stage itself down. Ever try unloading the groceries the car while it's rolling away from you? Put yourself in the mind of the CPU, who has detected that the power is going down, and now trying to clean up while the circuits go dead, trying to remember the last state, and the disappearing DC has rendered the memory erratic containing the bits in question. The worst kind of computer interruption around here is a power hit, which can go down in ways that leave circuits in indeterminate states. We have UPS on our two main PC's, just so the PC's can do an orderly shutdown. But there are all the boxes (washer, dryer, TVs, Microwaves, clock radios) that have CPUs in them and sometimes come up quite wierd depending on the timing of the hit. It's a new world. Hit the K3 power button (it sends a signal to the CPU, doesn't break the DC) and let the K3 clean up before it turns itself off in an orderly fashion. 73, Guy. ----- Original Message ----- From: "Erik N Basilier" <[hidden email]> To: <[hidden email]> Sent: Sunday, March 01, 2009 12:58 AM Subject: [Elecraft] K3 power loss: Last settings forgotten >I just shut down the station by "pulling the big switch" and then turned it > back on soon after. Of course I had to push the power button on the K3 to > get it going again. Then I noticed what I never noticed before: The K3, > while still tuned to the same 40m cw frequency, came up in LSB mode, with > coarse frequency display. I pushed FINE and MODE DOWN to get back to cw > and > two decimals. Then I shut down the same way again, with the same result. > Next time I powered down by pushing the K3 power button instead of the Big > Switch. This time when I powered the K3 on again it remembered all > settings. > Looks to me like the K3 doesn't store all settings unless its power switch > is pushed to shut down. Is this how it is supposed to work? I am running > 2.76. > > 73, > Erik K7TV > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by OE5CSP-Chris
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In reply to this post by Guy, K2AV
Guy,
I am very familiar with the internals of computers, more than enough to know that these behaviors can be expected unless one pointedly designs to eliminate them, and that *can* be done. There is no fundamental reasons that any machine that contains a computer needs to behave like a PC. I do not mean to criticize the design of the K3, particularly since we know that there are more important goals for the designers. My objective was just to find out whether the behavior of my K3 was consistent with the K3 design. In general, I find the K3 to be much more free from those "computerish" characteristics than a PC is, and that is one reason I am using a K3 and not a radio that depends on a PC to function. 73, Erik K7TV ----- Original Message ----- From: "Guy Olinger, K2AV" <[hidden email]> To: "Erik N Basilier" <[hidden email]>; <[hidden email]> Sent: Sunday, March 01, 2009 7:35 AM Subject: Re: [Elecraft] K3 power loss: Last settings forgotten > What you experienced is not a bug. Do you turn off your PC by unplugging > it? > > The K3 has a CPU in it, and in order to clean up and go to a power down > state, it needs to be RUNNING to stage itself down. Ever try unloading the > groceries the car while it's rolling away from you? Put yourself in the > mind of the CPU, who has detected that the power is going down, and now > trying to clean up while the circuits go dead, trying to remember the last > state, and the disappearing DC has rendered the memory erratic containing > the bits in question. > > The worst kind of computer interruption around here is a power hit, which > can go down in ways that leave circuits in indeterminate states. We have > UPS on our two main PC's, just so the PC's can do an orderly shutdown. But > there are all the boxes (washer, dryer, TVs, Microwaves, clock radios) > that have CPUs in them and sometimes come up quite wierd depending on the > timing of the hit. > > It's a new world. Hit the K3 power button (it sends a signal to the CPU, > doesn't break the DC) and let the K3 clean up before it turns itself off > in an orderly fashion. > > 73, Guy. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Brett Gazdzinski
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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
73 & GB
KA5OAI Sam Morgan |
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In reply to this post by AC7AC
Ron, I have been shutting down the external power rather than using the K3's
power switch hundreds of times, a habit I established with earlier radios. I am comforted to know that you have also shut down your K3 in a similar way with no ill effects. But one thing now comes to mind that I didn't think about previously. Twice in several months of having the K3 I had a problem where the radio seemed disconnected from the antenna and showed a high swr on transmit. I jiggled the connector pins at the automatic tuner board etc. to no effect. At the first instance, the radio just started working normally after I used its power switch to power down and back on again. The second time (months later) I had to reload the firmware to get back to normal. Of course, there is nothing to say that either incident had anything to do with how the radio was shut down, just something that came to mind. If there were a chance of corrupting the firmware by unexpected power loss, then it would have implications for portable operation where alligator clips happily jump off of battery terminal posts etc. 73, Erik K7TV ----- Original Message ----- From: "Ron D'Eau Claire" <[hidden email]> To: <[hidden email]> Sent: Sunday, March 01, 2009 11:04 AM Subject: Re: [Elecraft] K3 power loss: Last settings forgotten > And the K3 is pretty resistant to the sort of craziness some CPU's > experience with unexpected shutdowns. > > I'm not aware of anyone who has had a "crash" of the system due to the > power > being pulled unexpectedly. I've done it hundreds of times working with my > k3 > without any ill effects other than, as you noted, some front panel control > settings may not be stored. > > FWIW that's true of the K2 as well. > > 73, > > Ron AC7AC > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Re: K3 power loss: Last settings forgotten
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Ron:
I have never had this problem. I often operate with the power supply off. I do have 75 AH of batteries connected to the K3. I sometimes operate for 3 to 5 days (intermittently) before turning on the power supply. Just my backup plan. 73, Ty, W1TF, K3 #696 --- On Sun, 3/1/09, Ron D'Eau Claire <[hidden email]> wrote: > From: Ron D'Eau Claire <[hidden email]> > Subject: Re: [Elecraft] K3 power loss: Last settings forgotten > To: "'Erik N Basilier'" <[hidden email]>, [hidden email] > Date: Sunday, March 1, 2009, 1:57 PM > Interesting Eric. > > That's one you might post to [hidden email]. > I've not seen it here > and I suspect Wayne would be surprised to see it. (He > monitors that list > carefully.) > > Even though I frequently hit the POWER button switching off > the main supply, > when working on the K3 on the bench testing assembly > procedures, etc., I > often just "pull the plug" with the K3 live with > no ill effects. > > Indeed, the one problem with shutting down the K3 that > I've seen was that if > the power supply wasn't turned off, a few K3s > wouldn't turn on again later! > That was traced to small current leakage through the KPA3 > that managed to > keep the CPU partially "alive" so it never did a > complete shutdown. But > that's just the opposite. Turning off the main supply > "fixed" the problem > (it's also fixed by the addition of a 1N4148 diode as > described in > http://www.elecraft.com/K3/mods/KPA3_12V_Sense_Modification_Rev_A.pdf) > > Ron AC7AC > > > > -----Original Message----- > From: Erik N Basilier [mailto:[hidden email]] > Sent: Sunday, March 01, 2009 10:44 AM > To: Ron D'Eau Claire; [hidden email] > Subject: Re: [Elecraft] K3 power loss: Last settings > forgotten > > Ron, I have been shutting down the external power rather > than using the K3's > power switch hundreds of times, a habit I established with > earlier radios. > I am comforted to know that you have also shut down your K3 > in a similar > way with no ill effects. But one thing now comes to mind > that I didn't think > about previously. Twice in several months of having the K3 > I had a problem > where the radio seemed disconnected from the antenna and > showed a high > swr on transmit. I jiggled the connector pins at the > automatic tuner board > etc. to no effect. At the first instance, the radio just > started working > normally > after I used its power switch to power down and back on > again. The second > time (months later) I had to reload the firmware to get > back to normal. > Of course, there is nothing to say that either incident had > anything to do > with > how the radio was shut down, just something that came to > mind. If there > were a chance of corrupting the firmware by unexpected > power loss, then > it would have implications for portable operation where > alligator clips > happily jump off of battery terminal posts etc. > > 73, > Erik K7TV > > ----- Original Message ----- > From: "Ron D'Eau Claire" <[hidden email]> > To: <[hidden email]> > Sent: Sunday, March 01, 2009 11:04 AM > Subject: Re: [Elecraft] K3 power loss: Last settings > forgotten > > > > And the K3 is pretty resistant to the sort of > craziness some CPU's > > experience with unexpected shutdowns. > > > > I'm not aware of anyone who has had a > "crash" of the system due to the > > power > > being pulled unexpectedly. I've done it hundreds > of times working with my > > k3 > > without any ill effects other than, as you noted, some > front panel control > > settings may not be stored. > > > > FWIW that's true of the K2 as well. > > > > 73, > > > > Ron AC7AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by AC7AC
Ron, in those two instances where I had to take some extra steps to make
the K3 work normally again, I did correspond with Gary at Elecraft, but no conclusion about cause was arrived at. It was only our conversation today that made me think of the remote possibility of a connection between those incidents and my power shutdown habits. And because you suggested it, I now think that I should write Elecraft again about it. Thanks. Erik K7TV ----- Original Message ----- From: "Ron D'Eau Claire" <[hidden email]> To: "'Erik N Basilier'" <[hidden email]>; <[hidden email]> Sent: Sunday, March 01, 2009 11:57 AM Subject: RE: [Elecraft] K3 power loss: Last settings forgotten > Interesting Eric. > > That's one you might post to [hidden email]. I've not seen it here > and I suspect Wayne would be surprised to see it. (He monitors that list > carefully.) > > Even though I frequently hit the POWER button switching off the main > supply, > when working on the K3 on the bench testing assembly procedures, etc., I > often just "pull the plug" with the K3 live with no ill effects. > > Indeed, the one problem with shutting down the K3 that I've seen was that > if > the power supply wasn't turned off, a few K3s wouldn't turn on again > later! > That was traced to small current leakage through the KPA3 that managed to > keep the CPU partially "alive" so it never did a complete shutdown. But > that's just the opposite. Turning off the main supply "fixed" the problem > (it's also fixed by the addition of a 1N4148 diode as described in > http://www.elecraft.com/K3/mods/KPA3_12V_Sense_Modification_Rev_A.pdf) > > Ron AC7AC > > > > -----Original Message----- > From: Erik N Basilier [mailto:[hidden email]] > Sent: Sunday, March 01, 2009 10:44 AM > To: Ron D'Eau Claire; [hidden email] > Subject: Re: [Elecraft] K3 power loss: Last settings forgotten > > Ron, I have been shutting down the external power rather than using the > K3's > power switch hundreds of times, a habit I established with earlier radios. > I am comforted to know that you have also shut down your K3 in a similar > way with no ill effects. But one thing now comes to mind that I didn't > think > about previously. Twice in several months of having the K3 I had a problem > where the radio seemed disconnected from the antenna and showed a high > swr on transmit. I jiggled the connector pins at the automatic tuner board > etc. to no effect. At the first instance, the radio just started working > normally > after I used its power switch to power down and back on again. The second > time (months later) I had to reload the firmware to get back to normal. > Of course, there is nothing to say that either incident had anything to do > with > how the radio was shut down, just something that came to mind. If there > were a chance of corrupting the firmware by unexpected power loss, then > it would have implications for portable operation where alligator clips > happily jump off of battery terminal posts etc. > > 73, > Erik K7TV > > ----- Original Message ----- > From: "Ron D'Eau Claire" <[hidden email]> > To: <[hidden email]> > Sent: Sunday, March 01, 2009 11:04 AM > Subject: Re: [Elecraft] K3 power loss: Last settings forgotten > > >> And the K3 is pretty resistant to the sort of craziness some CPU's >> experience with unexpected shutdowns. >> >> I'm not aware of anyone who has had a "crash" of the system due to the >> power >> being pulled unexpectedly. I've done it hundreds of times working with my >> k3 >> without any ill effects other than, as you noted, some front panel >> control >> settings may not be stored. >> >> FWIW that's true of the K2 as well. >> >> 73, >> >> Ron AC7AC >> > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Brett Gazdzinski
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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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