[Elecraft] BIZARRE OFFERING FROM MFJ

[hbjr at optilink.us]

Somebody pls close this thread!

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of W2xj
Sent: Sunday, April 7, 2019 2:22 PM
To: Alan Bloom <n1al at sonic.net>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] BIZARRE OFFERING FROM MFJ

Mighty fine junk

Sent from my iPhone

> On Apr 7, 2019, at 10:22, Alan Bloom <n1al at sonic.net> wrote:
> 
> I've long had mixed feelings about MFJ.  They have some very 
> interesting, innovative, and cost-competitive products.  However 
> sometimes the quality isn't there.  For example I have an MFJ antenna 
> analyzer that was intermittent until I fixed a poor ground connection.
> I forget the details, but as I recall the problem was partly one of 
> design.
> 
> Alan N1AL
> 
>> On 2019-04-07 09:28, Wayne Burdick wrote:
>> 
>> I've used many MFJ products and in have had very little trouble with any
of them. For example, I make frequent use an MFJ-223 hand-held VNA -- it's
versatile and does the job. I've also used their manual tuners, antenna
switches, and portable/mobile whips. They have a very comprehensive product
line that's really unique in the industry.
>> 
>> That said, I do have some suggestions for MFJ's engineering team on how
they might improve their ATU. 
>> 
>> Looking at the photo, I see that they used much smaller toroidal 
>> cores for 5 of the 8 inductors in the L network. This could result in 
>> excessive heating, especially on the higher bands, at full power into 
>> a worst-case match. We specified T68 sized cores to remain 
>> conservative based on extensive testing. Also, if you click on the 
>> photo to see the details, you'll see what appears to be very 
>> inconsistent hand soldering of the SMD components. While this doesn't 
>> necessarily worsen performance or reliability, it should be done in a 
>> way that inspires confidence in the buyer. (Easy for me to say, of 
>> course. We have the luxury of mass-producing these assemblies using 
>> automated pick-and-place equipment at our fabricator in Monterey.)
>> 
>> Wayne
>> N6KR
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