I want to build a KW matchbox clone. Anyone have the coil specs handy?
Length, Diam & Number of turns for the coil and the link would be nice..
73,
Larry
KQ4BY
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Rick Westerman
Sent: Wednesday, March 17, 2004 9:45 AM
To: k2xx@swva.net; tentec@contesting.com
Subject: RE: [TenTec] Johnson Viking Matchbox vs. Annecke
I will answer Joe copying the group because this subject may
arise again.
I have personally been combing the want ads for over 10 years
looking for a second box.
I have NEVER seen one for sale.
There were only about 20 units ever built.
People who own them know what they have.
I originally wanted to purchase the unit or a kit, but Mr.
Annecke didn't have any more cabinets and was unwilling to place
an order because his source only sold a minimum of 20 units. He
didn't think he would ever manage to sell 20 more units, so that
was it. I was lucky enough to get one of his last sets of parts.
The schematic is shown in the link which Mike pointed out
earlier.
Here it is again:
http://www.cebik.com/link/link.html
ONCE AGAIN we need a public place to post stuff. Then I could
post the drawings and info.
73
Rick
(P.S. Joe, we'll go off line for details)
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Joe Giacobello
Sent: Wednesday, March 17, 2004 4:25 PM
To: Rick@dj0ip.de; tentec@contesting.com
Subject: Re: [TenTec] Johnson Viking Matchbox vs. Annecke
Rick, I'm a big fan of link coupled balanced tuners and own two
VMBs
myself. I would love to own a KW Annecke. Do you know of any
available
in DL? Can you supply the schematic for the KW unit that you
have? If
there's anyone over there who wants to sell a KW unit, let me
know.
73, Joe
Rick Westerman wrote:
>I changed the title because this is no longer 80m Loop specific.
>
>Don, I hope I didn't shock you by implying it was something new
>and you had missed it. As Mike pointed out, LB Cebik (W4RNL)
has
>done an excellent job of comparing the two circuits in his
>article on Link Coupled Tuners. You'll find it on his web site.
>
>Most people probably won't tell a difference between the two and
>for TEN-TEC users (at least the ones running barefoot) it
>probably doesn't matter whether one runs the original Johnson
>circuit or the Annecke circuit. In fact if you have a good tube
>amplifier, it won't matter either. It's just the hams with
>transistor power amplifiers who will see a great benefit from
>modifying the Johnson to an Annecke.
>
>The Johnson was designed in the days of tubes where every radio
>and amp had a PI-filter in its output. If the matchbox brought
>the antenna's impedance down to 150 or 200 ohms, that was just
>fine because the PI-filter could do the rest.
>Once transistors came along, the need was redefined to tighter
>tolerances. Before we had the WARC bands, it was no big deal
>because it was usually possible to find several lengths for your
>antenna which the Johnson could pull in to almost 1:1.
>
>What Annecke did was make the 50 ohm side switchable and add a
>270 pF variable in series with the link. With that, you can
>pretty match anything to 50 ohms. The trade-off is that you
have
>one more knob to adjust.
>
>So, if you don't have a TEN-TEC and your transceiver requires
>exactly 50 ohms, the Annecke circuit is a little bit better.
>
>LB shows a picture of the insides of the Annecke but he chose
the
>wrong Annecke matchbox. He showed the QRP version (200w). I
>have the "real" version. Go to my web site www.dj0ip.de and
>click on the picture at the bottom titled "Home of Orion".
>You'll see the matchbox just above the TFT monitor which is just
>above the Orion. Note the 4 big knobs. The one on the right
>titled "Sender" (meaning transmitter) is the additional
variable.
>I've been running both the high power and low power version of
>this matchbox for about 20+ years. However, often in contests
>when I'm running lower power, I substitute a "Differential-T"
>tuner because there's less knobs to tune. For high power,
>nothing beats the Johnson/Annecke circuit.
>
>I wanted to build a second one but parts are difficult to find.
>I was also considering the Z-Match designed by Lloyd, VK5BR.
>I've been discussing the pros and cons with LB. LB felt the
>Z-Match probably will not be as efficient. In the meantime I
see
>that he has included Lloyd's Z-match on his web site too. I
hope
>someone smarter than me takes the time to measure and report on
>the efficiency of the Z-match.
>
>I've scratched the idea of building another one and will simply
>purchase a used Johnson. One of the OM here on the reflector
was
>kind enough to reserve one for me. Now all I have to do is get
>to the states and pick it up!
>
>Finally, I would like to pay tribute to Mr. Annecke who passed
>away a couple of years ago. Altogether, I think he designed
>about 15 or 20 different matchboxes of various sizes and shapes
>and circuits. He sold them as kits, ready built, or just the
>components (which is what I bought). Unfortunately his son who
>took over his business, dropped the line of ham gear because it
>probably was not a lucrative business.
>
>I have all the circuit drawings of every matchbox Mr. Annecke
>produced. If I ever find time to work on my Ham website instead
>of my work web site, I want to exhibit what he contributed to
the
>ham community. Right now I can't even find time to use my
Orion.
>
>73
>Rick
>
>
>
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>
>
>
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