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Re: [Amps] MFJ products

To: amps@contesting.com
Subject: Re: [Amps] MFJ products
From: John Bodine <john.bodine@gmail.com>
Date: Tue, 5 Dec 2017 09:49:53 -0500
List-post: <mailto:amps@contesting.com>
Long ago I removed all adjustable voltage supplies from the shack because a
bump or a grandchild can break your heart(cook your transceiver).

On Tue, Dec 5, 2017 at 9:44 AM, Jim Thomson <jim.thom@telus.net> wrote:

> ##  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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-- 

Later,
        John Bodine/WU2E
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