## You forgot to tell us that it was a 40 A 13.8 vdc, switching type power
supply !
Found it on U tube, where the vdc pegged past 16 vdc. Another fellow had his
way over 45 vdc...and fried his yaesu. The u tube fellow says his did not
have
any over voltage protection built into it ! Since his was under warranty, MFJ
will
repair it..... but not the very expensive yaesu xcvr.
## Fuses on radios will only protect against excess current, not excess
voltage. Your
surge protector on the input of the 120 vac.. feeding the MFJ switching supply,
will not help at all.
The issue is the lack of over voltage protection in the mfj switching supply,
and what ever caused
it to crank out excess vdc in the 1st place... frying everything connected to
it.
## Either replace with a better quality switcher from a different
manufacturer, or use
an analog supply, like a 50 A CCS astron.
## way too many issues with the MFJ-4245 switcher imo. if the supply bows
up, who cares... but when the
same supply blows up a bunch of expensive gear connected to it, then its a
serious issue.
Jim VE7RF
From: Shon Edwards
Sent: Sunday, December 03, 2017 8:42 PM
To: Jim Thomson ; Amplifier Reflector
Subject: Re: [Amps] MFJ products
I know this isn't really an amp question, but I checked my email for mfj-4245mv
and found this one. Last week, the current just took off. Fried a couple
radios whose fuses didn't work. Also my surge protector didn't stop it from
frying my radios. Any idea what caused this or how to fix it?
Thanks!
de Shon, K6QT
Shon R. Edwards, MA, AG (Czech Republic)
Amateur call: K6QT
1039 N 2575 W
Layton, UT, 84041-7709
USA
Home phone: (801) 444-3445
E-mail: sre.1966@gmail.com
or
Shon Edwards
715 Strawberry Creek Private Rd.
Bedford, WY 83112
Cell: (307) 248-2104
On Tue, Sep 11, 2012 at 8:22 AM, Jim Thomson <jim.thom@telus.net> wrote:
Date: Tue, 11 Sep 2012 10:26:27 +0200
From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
Subject: Re: [Amps] MFJ products
My 5 cents worth:
I own and use several pieces of MFJ equipment, much of it has been in
daily use for more than 10years:
a MFJ-4245MV SMPS, no RF-hash, and has performed nearly 24/ 7 for
more than 10years
a MFJ-259B antenna analyzer, without a doubt the most useful tool
in my toolbox
I know there are better/more accurate/higher quality analyzers
available now - at vastly higher prices!
this one has been in use for more than 10 years in my shack and
in the field, and when I broke it
(my own fault - reverse polarity) MFJ was very helpful with
repair suggestions
I owned a MFJ-969 tuner for several years - did exactly what it was
supposed to do at a very reasonable price
Various power meters an dummy loads - again they have been
performing exactly as expected.
To conclude: yes corners have been cut here and there, but at the prices
asked you get fair usefulness and many times equipment which few of us
could afford without MFJ supplying it.
--
Vy 73 de OZ1PIF/5Q2M, Peter
## You obviously have not tried one of their SS HF linear amps..like the
AL-600 or AL-1300. I defy anybody to get one to run full bore for 5 years
straight.
Jim VE7RF.
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