OK, more data points. Since I was getting good SWR at the mW level with the analyzer, I cranked the power down to 1 watt and pressed tune. Got good SWR and 1 watt out. OK gently walked the power up and tried again. At 1.9 watts, I would get good SWR for a second and then it indicated 8.9:1 SWR.
I went out and bypassed the ICE suppressor and that made no difference. The only other radio I have that operates on 6M is my IC-706 - um, mobile. So I jerked it out of the truck and rigged it up in the shack and ran an SWR graph - less than 1.3:1 all the way. OK, so I hear FG5GP on 50.130 MHz and give him a call with 100 watts - no problem. He was 57 on my meter and he gave me a 57 report back. OK, so now I know something's afoot inside my K3. What do I need to do ? Someone mentioned clipping an offending component while waiting on a replacement part. What part do I need to order ? 73 and thanks for all the help ! Jamie, WB4YDL -----Original Message----- From: Joe Subich, W4TV [mailto:li...@subich.com] Sent: Friday, July 01, 2011 1:02 PM To: James C. Hall, MD; Elecraft Reflector Subject: Re: [Elecraft] K3 6M problem Normally I would tell you to connect your dummy load, enable the KAT3, tune into the dummy load then disable the tuner and try the antenna. However, I know there is an issue with the KAT3 finding the right match on 6 meters. Since you're seeing a high SWR after field day, inspect the KAT3 carefully to see if the 8 MHz trap has been damaged (extended TX into a less than ideal load). Damage to that trap will be most evident on six. 73, ... Joe, W4TV On 7/1/2011 1:25 PM, James C. Hall, MD wrote: > The radio was used at the digital station, so RTTY was the active mode. 6M > was not used on this radio. > > Ron, yes, you are quite correct about the ATU - it does work on 6M. :) I > just never had to use it. Just for grins I switched in the ATU and could > only get 3.9:1 SWR. Taking the cable off the ANT connector and putting it on > my MFJ analyzer, it shows 1.3:1. > > Sigh ... Worked perfectly on 6M prior to taking it to FD. > > 73, Jamie > WB4YDL > > -----Original Message----- > From: Joe Subich, W4TV [mailto:li...@subich.com] > Sent: Friday, July 01, 2011 11:51 AM > To: James C. Hall, MD; Elecraft Reflector > Subject: Re: [Elecraft] K3 6M problem > > > > Jamie, > > Did the antenna selection on the K3 get toggled to ANT 1 for > six meters? Remember the ATN1/ANT2 is stored on a per band > basis. If the rig was used in 6 with ANT 1 at field day, it's > likely that ANT 1 is still selected! > > 73, > > ... Joe, W4TV > > > On 7/1/2011 12:06 PM, James C. Hall, MD wrote: >> Hello: >> >> >> >> After returning my K3 back to the shack after Field Day, I have discovered >> that 6M no longer transmits with low SWR. I checked all the rear panel >> connections as it is interfaced through a microham MK2R+ and Stationmaster >> band decoder. However, I have the 6M antenna coax directly going to > Antenna >> 2 on the radio. Using an antenna analyzer, the antenna shows excellent > SWR. >> Using a dummy load to each antenna port, all bands shows good SWR except > 6M. >> I updated the firmware and cycled the power but I still have the HI SWR >> showing with 6M. >> >> >> >> I do have the PR6 pre-amp in line, but the problem is not receive. >> >> >> >> I'm stumped. Any help appreciated. >> >> >> >> 73, Jamie >> >> WB4YDL >> >> > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ______________________________________________________________ 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
