[Elecraft] OT: Looking for schematic and troubleshooting info on MFJ-223 VNA

[Mark Goldberg]

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 <n6kr at elecraft.com> 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 <garyk9gs at wi.rr.com> 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 <n6kr at elecraft.com
> >
> > Date: 8/22/19  6:11 PM  (GMT-06:00) To: Elecraft Reflector <
> > elecraft at 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 that's outdated.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
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