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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TenTec\]\s+OT\s+Antenna\s+Tuners\s*$/: 31 ]

Total 31 documents matching your query.

1. [TenTec] OT Antenna Tuners (score: 1)
Author: Jim WA9YSD <wa9ysd@yahoo.com>
Date: Wed, 9 Jul 2008 06:00:35 -0700 (PDT)
Some people like but radios cause they look for the one that operates well and has a nice feel to it or how it looks or what ever. I have gone through 6 different tuners and used a bunch more along w
/archives//html/TenTec/2008-07/msg00207.html (8,380 bytes)

2. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 09 Jul 2008 10:58:34 -0600
A roller inductor depends on pressure of the roller on the coil turns for that connection. When the pressure is low, the contact gets dirty, and so gets scratchy while tuning receive or transmit thou
/archives//html/TenTec/2008-07/msg00219.html (10,758 bytes)

3. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Jim WA9YSD <wa9ysd@yahoo.com>
Date: Thu, 10 Jul 2008 07:48:47 -0700 (PDT)
Putting on a fly wheel helps to eliminate the drag. Once the caps are centered I adjust the roller inductor to minimum SWR. Then tune the caps and repeat starting with the roller inductor if necessar
/archives//html/TenTec/2008-07/msg00230.html (7,935 bytes)

4. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Jim WA9YSD <wa9ysd@yahoo.com>
Date: Sat, 19 Jul 2008 05:41:07 -0700 (PDT)
Interesting what it says is this publication http://www.somis.org/bbat.html He tells about the Sham of baluns and fully supports current baluns. Does not mention L networks as to why it will not give
/archives//html/TenTec/2008-07/msg00318.html (7,782 bytes)

5. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 19 Jul 2008 08:50:09 -0700
http://www.somis.org/bbat.html He's in the dark ages with respect to understanding baluns and common mode chokes. W2DU, W7EL, and W1JR moved well beyond him more about 25 years ago, and my work is a
/archives//html/TenTec/2008-07/msg00324.html (8,285 bytes)

6. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 19 Jul 2008 10:36:53 -0600
While his understanding of impedance matching and filtering networks is a little off the wall, the concept of a balanced tuner with the balun at the 50 ohm side is a good one that keeps from abusing
/archives//html/TenTec/2008-07/msg00325.html (9,274 bytes)

7. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sat, 19 Jul 2008 08:29:26 -1000
Think about it mathematically. With an L network you have only two variables, the inductor and the capacitor. The goal is to transform the impedance of the load to 50 ohms resistive. The load can be
/archives//html/TenTec/2008-07/msg00326.html (9,303 bytes)

8. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Alfred Lorona" <w6wqc@dslextreme.com>
Date: Sat, 19 Jul 2008 17:01:20 -0700
With an L network antenna tuner there are always at least two possible combinations of L and C to provide a match. Under certain conditions of the source and load impedances, there are four possible
/archives//html/TenTec/2008-07/msg00330.html (9,213 bytes)

9. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Marinus Loewensteijn <zl2ml@hotmail.com>
Date: Sun, 20 Jul 2008 08:35:18 +0800
If I may just throw my humble opinion / experiences in here. I use less that 100 Watts so it may not apply to some of the big gun setups. For a balanced feed I prefer very much the S-Match from PA0FR
/archives//html/TenTec/2008-07/msg00332.html (9,978 bytes)

10. [TenTec] OT Antenna Tuners (score: 1)
Author: "Alfred Lorona" <w6wqc@dslextreme.com>
Date: Sun, 20 Jul 2008 19:17:16 -0700
Any complex source impedance can be matched to any complex load impedance by two L network configurations. One will be a low pass (series L and shunt C) while the other will be a high pass configurat
/archives//html/TenTec/2008-07/msg00335.html (11,092 bytes)

11. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 20 Jul 2008 17:08:22 -1000
Hi Al, Perhaps I did not state very clearly what I meant to say, however your writing seems to confirm what I meant to say. What I meant to say is that given a single configuration of L and C in an L
/archives//html/TenTec/2008-07/msg00336.html (12,791 bytes)

12. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Alfred Lorona" <w6wqc@dslextreme.com>
Date: Sun, 20 Jul 2008 21:29:55 -0700
Oh, Yes. Absolutely. Notice that in my first example the position or location of the L and C are interchanged but their values are different. Yes, for a given location of the L and C you correctly st
/archives//html/TenTec/2008-07/msg00337.html (9,403 bytes)

13. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Ken Brown <ken.d.brown@hawaiiantel.net>
Date: Sun, 20 Jul 2008 18:59:12 -1000
If it is a Ten-Tec model 238 or 235, and probably also 229, there are only two configurations available. Those two configurations both have the L in series. The shunt C can be switched to either the
/archives//html/TenTec/2008-07/msg00338.html (9,683 bytes)

14. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 21 Jul 2008 00:57:06 -0600
That's not necessarily true. The loaded Q depends on the impedance ratio. The higher the ratio, the higher the loaded Q. So for a large impedance ratio, there has to be a high loaded Q and large circ
/archives//html/TenTec/2008-07/msg00339.html (10,336 bytes)

15. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Jim WA9YSD <wa9ysd@yahoo.com>
Date: Mon, 21 Jul 2008 03:41:31 -0700 (PDT)
Only up to 21 MHZ, is because of too much inductance. Unun must be acting like a old fashion link coil with out the link. I did something like that with a single coil and had 3 pairs of taps. One pai
/archives//html/TenTec/2008-07/msg00340.html (8,801 bytes)

16. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 21 Jul 2008 08:50:18 -0600
Unun is simply a transformer. Can't call it an unun balun. Probably made with two windings series connected like a 1:4 voltage balun but connected to the world differently. Where the 1:4 voltage balu
/archives//html/TenTec/2008-07/msg00341.html (10,343 bytes)

17. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Marinus Loewensteijn <zl2ml@hotmail.com>
Date: Tue, 22 Jul 2008 14:48:32 +0800
I have not been following the thread closely. However I disagree with the statement that the input unun is "just" a transformer. It is important that is understood that this is an unun where there is
/archives//html/TenTec/2008-07/msg00343.html (9,489 bytes)

18. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 22 Jul 2008 09:08:52 -0600
EXACTLY the definition of just a transformer. Only the frequency range is different from the power transformer out on the power pole. Gives that 1:4 impedance ratio (1:2 voltage ratio) over a wide ra
/archives//html/TenTec/2008-07/msg00344.html (9,787 bytes)

19. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: Jim WA9YSD <wa9ysd@yahoo.com>
Date: Tue, 22 Jul 2008 14:07:14 -0700 (PDT)
For what its worth. Johnson match box was very popular in its day. So people could not get it to work on 10M because of what ever. To long antenna, feed line issue what ever. Inductance was the probl
/archives//html/TenTec/2008-07/msg00346.html (8,779 bytes)

20. Re: [TenTec] OT Antenna Tuners (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 22 Jul 2008 15:24:12 -0600
Yes. The match box always has the two differential capacitors across the tuned winding and they can't be small enough to work good at ten meters and be big enough for 80 meters. My ten meter tuners a
/archives//html/TenTec/2008-07/msg00347.html (9,317 bytes)

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