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 <[email protected]> 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 <[email protected]> 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 <[email protected] > > > > Date: 8/22/19 6:11 PM (GMT-06:00) To: Elecraft Reflector < > > [email protected]> 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 that's outdated.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: > [email protected] > > list hosted by: http://www.qsl.netPlease help support this email list: > > http://www.qsl.net/donate.htmlMessage delivered to [email protected] > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
