I'm going to build a T antenna for 160 in a few weeks. I need a capacitor to tune out z = 41.2 + j139. For the educational experience, how do I calculate a cap for the above equation? I'm going to tr
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 7 Nov 2016 14:12:17 -0400
You can remove the inductive reactance by inserting an equal value of a capacitor in series. The impedance is close enough. I need a capacitor to tune out z = 41.2 + j139. For the educational experie
I need a capacitor to tune out z = 41.2 + j139. For the educational experience, how do I calculate a cap for the above equation? I'm going to try and track down a variable cap for the above so I can
Xc=1/(2*Pi*f*c) For 1825 kHz, C = 628 pF, leaving 41.2 +j0. But, that doesn't get you to Zo = 50. But this does... Hi-Pass L option: 285 pF series C with 6.1 uH shunt across Zo=50 input side; loss =
P.S. Unless you really need a flat 1.1 SWR, then just use series C of 628 pF (1825 kHz). That eliminates the L. However, adding in L, or at least accommodating it in your layout does help if you plan
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Mon, 7 Nov 2016 19:28:39 +0000 (UTC)
If you are only concerned with tuning out the inductive reactance, a series capacitor can be chosen for that purpose. The resulting Z of the antenna then becomes 41.2 +j0 and the SWR drops from abou
I use a neat little program called HamIC, which has a stack of little calculators, including an L network calculator. See http://www.sweetscape.com/hamic/ Having an inductive reactance below 50 ohms
You guys sure know how to take the fun out of something. What ever happened to the time honored method of going out to the feedpoint with a SWR analyzer, plastic cutting board, fist full of clip lead
Modern toys, that's what happened. But there are some emerging, very efficient antennas where the old methods can't possibly tell you enough to know what to do to tune it to an efficient spot. They h
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Tue, 8 Nov 2016 16:12:44 -0500
That's what so nice about an AIM. It gives you all that and more on one screen with overlaying graphs. Take a multiband vertical and all the bands show up, or adjust the span to look at each band. Yo
I've had an AIM for a long time, only version 2 of the PCB. A little slow but fully functional. However it needs a separate PC. Check out a Sark 110. An AIM plus a PC, plus a smartphone battery syste
Guy, are you getting my emails regarding the FCP for 40m? thanks 73 Dwight NS9I But there are some emerging, very efficient antennas where the old methods can't possibly tell you enough to know what
In The dark with a flashlight Ed On 11/8/2016 12:16 PM, Rob Atkinson wrote: You guys sure know how to take the fun out of something. What ever happened to the time honored method of going out to the
right Ed, and a small flashlight you hold in your teeth so you can use both hands. :-) Bob K6UJ Ed On 11/8/2016 12:16 PM, Rob Atkinson wrote: You guys sure know how to take the fun out of something.
And kneeling in the snow Rob K5UJ _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesti
Better yet, the VNWA 3e. Full VNWA, full performance to 500 MHz, less dynamic range to 1.3 GHz, $700 delivered with calibration loads. Powers from the USB port that also exchanges data and control wi