Hi Alan, Thanks.
I saw you try to hit the reflector twice but nothing came through. Thanks for that suggestion but I think I found the problem. Looks like 60 Hz leaking into the mic from an open ground somewhere in the mic line to the headset. You raise a good point that I had not considered. I will keep it in mind in case I run into a problem in the future. 73 Joe AJ1Y From: Alan <n...@sonic.net> Sent: Tuesday, December 4, 2018 19:18 To: Joe Rogers <jerogers...@hotmail.com> Subject: Re: [Elecraft] [K3] - Hum on SSB Transmissions Hi Joe, I twice tried to reply on the reflector, but both times the message posted with no text. No idea what's going on. Anyway, you might check if the problem could be hum getting into the mic mechanically. At the community radio station I volunteer for we had hum on the desk mics in the main studio, but only when they were on the same table as the studio computer. I finally figured out it was vibration from the fan in the computer transmitted via the table to the mics. As an experiment you might try lifting the mic off the table. If that makes the hum go away, then it's likely mechanical vibration. The solution could be a shock-mounted mic or perhaps a boom mic mounted to the wall. 73, Alan N1AL On 12/4/18 8:03 AM, Joe Rogers wrote: Hi Don, You hit upon exactly what I did!! When I last did on air checks, I had the Proset in the rear panel jack and had same hum as in front panel - which, as you pointed out, would indicate that the adapter was not the problem and the issue is in the Proset itself. I am pretty much convinced it is in the Proset IC now. I just cannot understand why after only about a year, I have this failure. My prior Proset was 6 years old and no problem. Anyway, I am talking to Heil and hope to get the whole issue sorted out. 73 Joe AJ1Y -----Original Message----- From: Don Wilhelm <donw...@embarqmail.com><mailto:donw...@embarqmail.com> Sent: Tuesday, December 4, 2018 10:48 To: Joe Rogers <jerogers...@hotmail.com><mailto:jerogers...@hotmail.com>; elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net> Subject: Re: [Elecraft] [K3] - Hum on SSB Transmissions Joe, If you are using the Front Panel adapter for the ProSet-Ic, try plugging the microphone into the MIC jack in the back of the K3 and changing the MIC SEL menu to the rear panel. If the hum is not present, then you have a bad adapter instead of a bad mic. 73, Don W3FPR On 12/4/2018 10:32 AM, Joe Rogers wrote: Hi Don, Thanks for the email suggestions. I ran some on air checks of the Proset and the other mike I have - a Gold Elite. Gold Elite audio was fine. Proset was poor. Believe it is the open microphone ground lead problem that you mentioned. Thanks, 73 Joe AJ1Y -----Original Message----- From: Don Wilhelm <donw...@embarqmail.com><mailto:donw...@embarqmail.com> Sent: Monday, December 3, 2018 19:44 To: Joe Rogers <jerogers...@hotmail.com><mailto:jerogers...@hotmail.com>; elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net> Subject: Re: [Elecraft] [K3] - Hum on SSB Transmissions Joe, Do you hear that hum when you operate into a dummy load? If not, then check the common mode choke on the antenna, you are likely getting RF-In-the-Shack from the antenna - the fact that it diminishes when you put your hand on the K3 amplifies that this may be the problem. Forget about grounding the radio for this problem, solve it at the antenna feedpoint with a good common mode choke on the feedline. Other possibilities are power supply ripple (run it on battery to check) or an open microphone ground lead (try other microphones). Make sure the rear panel jacks are fully plugged (give them an extra push). 73, Don W3FPR On 12/2/2018 4:17 PM, Joe Rogers wrote: I normally operate CW but the other day and have not been SSB for a few weeks to a month. Yesterday, I was getting ready to operate SSB and I noted a hum through the monitor when I key the transmitter. By way of background, K3 is 2012 vintage and I assembled the kit. No problems with until this one. I have found several similar threads mentioning a hum on SSB transmit but of the mentioned solutions worked to solve my problem. I have Heil Pro set IC and Heil Gold Elite. The problem seems much more pronounced with Proset IC. Whether it is connected to front panel (FP.H or RP.H Bias on) makes no difference. If I used PTT or VOX it is there. Set Mic Gain at anything above zero it starts. With higher mic gain and higher compression it is worse. I have made some PSK contacts using the LIN IN input and seems to work OK. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft<https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7Ca5505064cb3546a22e2208d65a471ab6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636795658762853228&sdata=aoan6p4wU3OPU4Cr18JLBkrI0llhOYx6lrGKJ4HfYbU%3D&reserved=0> Help: http://mailman.qth.net/mmfaq.htm<https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=02%7C01%7C%7Ca5505064cb3546a22e2208d65a471ab6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636795658762853228&sdata=QOYxOrMQHZ9%2Bmxj7kG3Y4bZBciNDtwOqFY0r6bWTDqw%3D&reserved=0> Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net<https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net&data=02%7C01%7C%7Ca5505064cb3546a22e2208d65a471ab6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636795658762853228&sdata=y0DygLMdwN3R9EOxl01oOB6kEdDrPcejuA3ONHFhG6o%3D&reserved=0> Please help support this email list: http://www.qsl.net/donate.html<https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html&data=02%7C01%7C%7Ca5505064cb3546a22e2208d65a471ab6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636795658762853228&sdata=7Xjfm4D86lsIumKlMVwgDpYdeuXAHT8lVVeiYBfr6xI%3D&reserved=0> Message delivered to n...@sonic.net<mailto:n...@sonic.net> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
