Well, not to beat a dead horse, but I've always been partial to
Nye-Viking MB-V-A tuners. I have several and they have been
able to tune most anything. They're a bit touchy at the low end of
80M and at 160M when you get away from resonance.
On the other hand they do not mind outdoor temperature changes or
rain/snow, drifting only slightly over time, if at all. And they
are stable at high power.
Too bad they're no longer being made, but they were crafted well.
73 de Phil - N8PS
Quoting Al Gulseth <wb5jnc@centurytel.net>:
Rick,
Just to clarify here - when you say "if you can find a good JVM, buy
it" - are
you referring to the 275W or the KW version, or both?
TNX/73, Al
On Mon July 18 2016 11:00:54 am rick@dj0ip.de wrote:
FULL AGREEMENT GARY, EVERY WORD.
RECOMMENDATION TO ALL: if you can find a good JVM, buy it. You'll never
regret it.
WARNING: More than half of the JVM's I have seen at hamfests were garbage
on the inside and not worth much more than the scrap metal value of the
box. BEFORE YOU BUY, remove the 30 or so screws and take a look and the
inner components.
Tip: Most people selling these won't want you to open them. When I bought
my last one, I offered the OM $10 to allow me to open it up. Said if it is
clean, I will buy it and the $10 goes towards the purchase. If not clean,
I won't buy it but he can keep the $10. If he still won't let you open it,
DON'T BUY IT. It probably has a melted coil form (the larger coil) and is
no longer balanced.
73
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Gary J
FollettDukes HiFi Sent: Monday, July 18, 2016 4:13 PM
To: wb5jnc@centurytel.net; Discussion of Ten-Tec Equipment
Cc: Paul Christensen
Subject: Re: [TenTec] OT: Question to the group
Antennas and tuners are fun. They are about the last bastion in which hams
can still perform meaningful experiments and produce publishable results.
Radios have simply gotten complex to the point at which everyday hams can
no longer do much with them but plug them in and turn the knobs (or press
the keys).
SMD’s and SDR’s only serve to take hams farther from being involved with
their radios’s operational theory.
Antennas (and tuners), on the other hand, offer an opportunity for one to
perform mathematical modeling to predict designs, optimize them, build them
and finally test them.
Paul and Rick both have shown extensive knowledge, both in terms of
modeling and practical construction. Their input is very valuable to this
discussion.
I do not yet have the time to go into those aspects of antennas and tuners
since I am still spending my time doing lab science on chemical sensors and
flame detectors.
Therefore, my expressed opinions on the topic are based only upon my own
practical experiences, some of those being over 40 years ago.
Thanks for an interesting discussion in which I received more than I gave.
I admit to having overstated the EFJ Matchbox in terms of being the “best
ever”, but it is better than most I have seen lately, and t worked in every
application in which I tried it. Plus, it never arced on me.
It’s kind of like a restaurant owner saying "Our restaurant has the best
burger anywhere”. Really? Have they tried all of them and taken into
account that different people have different preferences in burgers?
Gary
W0DVN
PS: Does anyone know why Ten ten chose to allow operation of the internal
auto tuner in the Orion only on antenna 1 output? Everybody else seems to
have figured out long ago how to do the antenna switching AFTER the tuner
so that it would work on both antenna outputs.
PPS: The EFJ Matchbox was a real pain to repair if the band switch seized
up (which it frequently did). The level of disassembly required to remove
the shaft from the switch, clean and lubricate it, was far disproportionate
compared with other tuners. It is nice to see that Nye Viking carried this
tradition forward with the MB5 VI series. What a masterpiece of design in
terms of making parts nearly impossible to remove for repair! Add that to
the fact that there were several designs for the directional coupler, only
one of which was documented, and you have good reason to make parts mules
out of some of them.
> On Jul 18, 2016, at 8:38 AM, Al Gulseth <wb5jnc@centurytel.net> wrote:
>
> Paul,
>
> Why the need for a rotating turret? Wouldn't switching taps accomplish
> the same thing? Cliplead taps on the coil have been a staple of link
> coupled systems since the early days of ham radio, and it seems to me
> that one could locate the optimum taps for each band and then use relays
> to switch them. Doing it that way shouldn't be any more complex than a
> typical autotuner is.
>
> 73, Al
>
> On Mon July 18 2016 6:47:02 am Paul Christensen wrote:
>> ...
>> A remote-controlled link tuner would by my Holy Grail, but the
>> mechanical complexities start getting in the way of improved
>> efficiency. To do it right would require separate link coils moved on a
>> rotating turret. ...
>>
>> Paul, W9AC
>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
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