[TenTec] OT: Question to the group

[Al Gulseth]

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 at 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 at contesting.com] On Behalf Of Gary J
> FollettDukes HiFi Sent: Monday, July 18, 2016 4:13 PM
> To: wb5jnc at 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 at 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
> >>
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