Noise when K-3 keyed
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My Upgraded K-3 has a noise when the transmitter is keyed. The noise sounds like either some type of data noise or a severe feedback The noise is there the moment that the radio is keyed, no type of voice input needed. I have checked all settings and can find nothing that is out of spec. I bypassed the 100 watt amp and the problem was still there. I am using Heil Proset headset and when the radio is put into test the audio is fine in the headset. I used the recorder to make sure the noise was there during transmit and I also set up a second radio to monitor the K-3. The noise was still there. I have no idea what to check next, if anyone has a suggestions it would be appreciated.
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OK, this reply is to the list, lots of very smart and experienced folks
there. Let's see what others come up with given that additional info. It sounds to me like most if not all of the usual suspects are ruled out. 73, Fred K6DGW Sparks NV USA Washoe County DM09dn On 9/18/2016 6:27 PM, Louis Ives wrote: > Thanks for the reply. The noise is there in all modes and I am using > Vox but the noise is there even when I key with foot ptt. I > completely disconnected from the antenna system with same results. I > tried with dummy load with same results. The noise almost sounds like > what you would get with noise generator or other injected noise. > >> On Sep 18, 2016, at 9:12 PM, Fred Jensen <[hidden email]> >> wrote: >> >> Hmmm ... first thought would be RF in undesirable places. >> >> 1. How are you asserting PTT? Foot or other switch, or VOX? >> >> 2. If it's not VOX, is it really as soon as you press the switch, >> or does it start as soon as you talk [which can often be almost >> simultaneous]? FWIW: I once had a colleague who couldn't master >> "point and click." His mode was click and then point at what he >> wanted. Push then Talk totally eluded him. :-) >> >> 3. What happens in CW mode? >> >> The K3 makes no RF in TX test, a big clue. Give us a few more >> tidbits of info, like your antenna situation, actions into a dummy >> load if you have one, etc. I'm sure you'll get a lot of help >> here. >> >> 73, >> >> Fred K6DGW Sparks NV USA Washoe County DM09dn ______________________________________________________________ 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 Message delivered to [hidden email] |
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I had the same problem - turned out to be noise from the computer (I
was using the USB CODEC for audio in/out to the computer). Ken At 06:41 PM 9/18/2016, Fred Jensen wrote: >OK, this reply is to the list, lots of very smart and experienced folks there. > >Let's see what others come up with given that additional info. It >sounds to me like most if not all of the usual suspects are ruled out. > >73, > >Fred K6DGW >Sparks NV USA >Washoe County DM09dn > >On 9/18/2016 6:27 PM, Louis Ives wrote: >>Thanks for the reply. The noise is there in all modes and I am using >>Vox but the noise is there even when I key with foot ptt. I >>completely disconnected from the antenna system with same results. I >>tried with dummy load with same results. The noise almost sounds like >>what you would get with noise generator or other injected noise. >> >>>On Sep 18, 2016, at 9:12 PM, Fred Jensen <[hidden email]> >>>wrote: >>> >>>Hmmm ... first thought would be RF in undesirable places. >>> >>>1. How are you asserting PTT? Foot or other switch, or VOX? >>> >>>2. If it's not VOX, is it really as soon as you press the switch, >>>or does it start as soon as you talk [which can often be almost >>>simultaneous]? FWIW: I once had a colleague who couldn't master >>>"point and click." His mode was click and then point at what he >>>wanted. Push then Talk totally eluded him. :-) >>> >>>3. What happens in CW mode? >>> >>>The K3 makes no RF in TX test, a big clue. Give us a few more >>>tidbits of info, like your antenna situation, actions into a dummy >>>load if you have one, etc. I'm sure you'll get a lot of help >>>here. >>> >>>73, >>> >>>Fred K6DGW Sparks NV USA Washoe County DM09dn > >______________________________________________________________ >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 >Message delivered to [hidden email] ------------------------------------------------------------------------------ President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net "We don't just make 'em. We use 'em!" ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by louis a. ives
Louis,
It goes away in TX TEST. So I suspect it is an RF-in-the-shack problem. Try the K3 into a dummy load to verify that assumption. If it is OK on a dummy load, your best fix is in the antenna system - better baluns, check antenna connections and anything else that can cause common mode feedline currents. 73, Don W3FPR On 9/18/2016 8:53 PM, Louis Ives wrote: > My Upgraded K-3 has a noise when the transmitter is keyed. The noise sounds like either some type of data noise or a severe feedback The noise is there the moment that the radio is keyed, no type of voice input needed. I have checked all settings and can find nothing that is out of spec. I bypassed the 100 watt amp and the problem was still there. I am using Heil Proset headset and when the radio is put into test the audio is fine in the headset. I used the recorder to make sure the noise was there during transmit and I also set up a second radio to monitor the K-3. The noise was still there. I have no idea what to check next, if anyone has a suggestions it would be appreciated. > > ______________________________________________________________ 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 Message delivered to [hidden email] |
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On Sun, 2016-09-18 at 22:19 -0400, Don Wilhelm wrote:
> Louis, > > It goes away in TX TEST. So I suspect it is an RF-in-the-shack > problem. > Try the K3 into a dummy load to verify that assumption. > > If it is OK on a dummy load, your best fix is in the antenna system - > better baluns, check antenna connections and anything else that can > cause common mode feedline currents. > > 73, > Don W3FPR Bingo! I was getting ready to send the same message... I am also sure it is RF related. -- 73's, and thanks, Dave (NK7Z) For software/hardware reviews see: http://www.nk7z.net ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by k6dgw
Monitors, Supplies, poorly constructed LED light supplies (built into bulbs)
in my personal experience are great sources of noise. I find them easy to figure out using my P3 when the level is low and then one by one eliminated potential sources. An LED lit TV used as a monitor is one of the low level issues I have found. 73, K9YEQ -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of Ken Arck Sent: Sunday, September 18, 2016 9:13 PM To: [hidden email] Subject: Re: [Elecraft] Noise when K-3 keyed I had the same problem - turned out to be noise from the computer (I was using the USB CODEC for audio in/out to the computer). Ken At 06:41 PM 9/18/2016, Fred Jensen wrote: >OK, this reply is to the list, lots of very smart and experienced folks there. > >Let's see what others come up with given that additional info. It >sounds to me like most if not all of the usual suspects are ruled out. > >73, > >Fred K6DGW >Sparks NV USA >Washoe County DM09dn > >On 9/18/2016 6:27 PM, Louis Ives wrote: >>Thanks for the reply. The noise is there in all modes and I am using >>Vox but the noise is there even when I key with foot ptt. I >>completely disconnected from the antenna system with same results. I >>tried with dummy load with same results. The noise almost sounds like >>what you would get with noise generator or other injected noise. >> >>>On Sep 18, 2016, at 9:12 PM, Fred Jensen <[hidden email]> >>>wrote: >>> >>>Hmmm ... first thought would be RF in undesirable places. >>> >>>1. How are you asserting PTT? Foot or other switch, or VOX? >>> >>>2. If it's not VOX, is it really as soon as you press the switch, or >>>does it start as soon as you talk [which can often be almost >>>simultaneous]? FWIW: I once had a colleague who couldn't master >>>"point and click." His mode was click and then point at what he >>>wanted. Push then Talk totally eluded him. :-) >>> >>>3. What happens in CW mode? >>> >>>The K3 makes no RF in TX test, a big clue. Give us a few more >>>tidbits of info, like your antenna situation, actions into a dummy >>>load if you have one, etc. I'm sure you'll get a lot of help here. >>> >>>73, >>> >>>Fred K6DGW Sparks NV USA Washoe County DM09dn > >______________________________________________________________ >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 Message delivered to >[hidden email] ---------------------------------------------------------------------------- -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net "We don't just make 'em. We use 'em!" ______________________________________________________________ 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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