Re: [Elecraft] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA
There is some pretty hilarious irony in that recommendation from MFJ. That being said, is there any possibility to swap out the battery pack? If it just gave up the ghost on it's own (i.e., you didn't accidentally blow the front end or something), that would be my first suspect for something that might just suddenly fail on it's own. 73, Dave AB7E On 8/22/2019 5:10 PM, Wayne Burdick wrote: I already did what they said they would do: open it up and look for any parts that had come loose and resolder them. Wayne __ 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] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA
I have an MFJ 226 and it seems fine. But a friend had that one too and opted to get a Rig Expert analyzer to replace it because he liked it better. Might be a chance to try one if your MFJ is dead. Jack BMW Motorcycles Chuck KE9UW c-haw...@illinois.edu Sent from my iPad > On Aug 22, 2019, at 7:10 PM, Wayne Burdick wrote: > > I already did what they said they would do: open it up and look for any > parts that had come loose and resolder them. They don't build it and can't > do much in the way of troubleshooting. It's also out of warranty.l > > Wayne > > >> On Thu, Aug 22, 2019 at 5:01 PM Gary K9GS wrote: >> >> I have one of these and I'd be interested in what you find out. Did you >> transmit into it by mistake?I'm pretty sure MFJ doesn't manufacture these >> but I would contact their customer service and see what they say.73,Gary >> K9GS >> Original message From: Wayne Burdick >> Date: 8/22/19 6:11 PM (GMT-06:00) To: Elecraft Reflector < >> elecraft@mailman.qth.net> Subject: [Elecraft] OT: Looking for schematic >> and troubleshooting info on >>MFJ-223 VNA My MFJ-223 VNA took a dive (cause unknown). The SWR >> readings are very high regardless of load. Has anyone found a schematic for >> this thing? The manual also mentions an MCU reset switch, but I'm guessing >> that's outdated. No such >> switch.tnxWayneN6KR__Elecraft >> mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: >> http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis >> list hosted by: http://www.qsl.netPlease help support this email list: >> http://www.qsl.net/donate.htmlMessage delivered to garyk...@wi.rr.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 >> Message delivered to n...@elecraft.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 > Message delivered to c-haw...@illinois.edu __ 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] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA
I have no experience with that one, but a common failure of other small two port VNAs is ESD blowing the RF switches at the ports. That is a one port VNA, so I don't know if it even has switches. What can it hurt to replace whatever part is closest to the connector? I have a MiniVNA Tiny two port VNA and it works well, although dynamic range could be better. 73, Mark W7MLG On Thu, Aug 22, 2019, 5:11 PM Wayne Burdick wrote: > I already did what they said they would do: open it up and look for any > parts that had come loose and resolder them. They don't build it and can't > do much in the way of troubleshooting. It's also out of warranty.l > > Wayne > > > On Thu, Aug 22, 2019 at 5:01 PM Gary K9GS wrote: > > > I have one of these and I'd be interested in what you find out. Did you > > transmit into it by mistake?I'm pretty sure MFJ doesn't manufacture these > > but I would contact their customer service and see what they say.73,Gary > > K9GS > > Original message From: Wayne Burdick > > > Date: 8/22/19 6:11 PM (GMT-06:00) To: Elecraft Reflector < > > elecraft@mailman.qth.net> Subject: [Elecraft] OT: Looking for schematic > > and troubleshooting info on > > MFJ-223 VNA My MFJ-223 VNA took a dive (cause unknown). The SWR > > readings are very high regardless of load. Has anyone found a schematic > for > > this thing? The manual also mentions an MCU reset switch, but I'm > guessing > > that's outdated. No such > > > switch.tnxWayneN6KR__Elecraft > > mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: > > http://mailman.qth.net/mmfaq.htmPost: mailto: > elecr...@mailman.qth.netThis > > list hosted by: http://www.qsl.netPlease help support this email list: > > http://www.qsl.net/donate.htmlMessage delivered to garyk...@wi.rr.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 > > Message delivered to n...@elecraft.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 > Message delivered to marklgoldb...@gmail.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA
I already did what they said they would do: open it up and look for any parts that had come loose and resolder them. They don't build it and can't do much in the way of troubleshooting. It's also out of warranty.l Wayne On Thu, Aug 22, 2019 at 5:01 PM Gary K9GS wrote: > I have one of these and I'd be interested in what you find out. Did you > transmit into it by mistake?I'm pretty sure MFJ doesn't manufacture these > but I would contact their customer service and see what they say.73,Gary > K9GS > Original message From: Wayne Burdick > Date: 8/22/19 6:11 PM (GMT-06:00) To: Elecraft Reflector < > elecraft@mailman.qth.net> Subject: [Elecraft] OT: Looking for schematic > and troubleshooting info on > MFJ-223 VNA My MFJ-223 VNA took a dive (cause unknown). The SWR > readings are very high regardless of load. Has anyone found a schematic for > this thing? The manual also mentions an MCU reset switch, but I'm guessing > that's outdated. No such > switch.tnxWayneN6KR__Elecraft > mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: > http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis > list hosted by: http://www.qsl.netPlease help support this email list: > http://www.qsl.net/donate.htmlMessage delivered to garyk...@wi.rr.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 > Message delivered to n...@elecraft.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA
I have one of these and I'd be interested in what you find out. Did you transmit into it by mistake?I'm pretty sure MFJ doesn't manufacture these but I would contact their customer service and see what they say.73,Gary K9GS Original message From: Wayne Burdick Date: 8/22/19 6:11 PM (GMT-06:00) To: Elecraft Reflector Subject: [Elecraft] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA My MFJ-223 VNA took a dive (cause unknown). The SWR readings are very high regardless of load. Has anyone found a schematic for this thing? The manual also mentions an MCU reset switch, but I'm guessing that's outdated. No such switch.tnxWayneN6KR__Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to garyk...@wi.rr.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA
On Thu, 22 Aug 2019 16:11:37 -0700, you wrote: >My MFJ-223 VNA took a dive (cause unknown). The SWR readings are very high >regardless of load. > >Has anyone found a schematic for this thing? The manual also mentions an MCU >reset switch, but I'm guessing that's outdated. No such switch. > >tnx >Wayne >N6KR > Contact the MFJ support at their web site they may have a schematic they can send you. __ 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
