[Antennas] re:MFJ986

[Dan]

Hi Alan,

I used to use a MFJ tuner [945] that worked very well for a long time, 
but eventually I started having problems on some bands.  I opened up the 
tuner to see if maybe I needed to clean some contacts, and discovered 
the real problems...  About 1/3 of the contacts inside of the tuner had 
very poor, on no solder joints!  I was amazed that it had worked at 
all!   But, after about 20 minutes with a soldering iron, I never had 
another problem with the tuner.  I wouldn't suspect the tuner design 
itself of being faulty, but I would go through it and check the solder 
joints for problems...

BTW, I'm not one to knock MFJ products, most I have owned have been fine 
and I've owned several of their products.  But the tuner I had was very 
poorly constructed, and must have had zero quality control inspection...

73
Dan

- 
K9ZF /R no budget Rover ***QRP-l #1269
Check out the Rover Resource Page at:  http://www.qsl.net/n9rla
List Administrator for:  InHam+grid-loc+ham-books



Alan Hughes wrote:

> Unfortunately the tuner has the roller inductor so it is infiinitely 
> adjustable. The settings for lowest SWR are towards the minimum
> but not at the extreme. If the tuner can only manage 3 or 4 to 1 SWR 
> with a 50 ohm dummy load then it cannot have anything to do with any 
> of the antennas. I do not know what type of tuner
> cicuit is used in the automatic atu in the IC761 but that will handle 
> any antenna I have tried to use on 17 metres. Although my Dummy Load 
> is only homebrew. it is reasonable accurate and in the straight 
> through position the SWR reflected reading
> does not move off the meter stop. It is very frustrating, but I cannot 
> see any particular reason why it should not handle the
> tuning on 17 metres.
> Alan ZL3KR
>
>
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-- 
K9ZF /R no budget Rover ***QRP-l #1269
Check out the Rover Resource Page at:  http://www.qsl.net/n9rla
List Administrator for:  InHam+grid-loc+ham-books