A few days ago I posted a video explaining some experiments I did adding short radials to my feed and termination grounds on the Beverage. During that week temperatures went as low as -41 C at the st
Author: Mpridesti via TowerTalk <towertalk@contesting.com>
Date: Tue, 21 Jan 2020 19:35:09 -0500
Steve I always wondered what people do in the dead of winter in VE6 land. Mystery solved! Regards, Mark, K1RX _______________________________________________ _________________________________________
Steve, Have you eliminated the core material in the 9:1 transformer as a possible source of the problem? I don't see how the resistance of the galvanized wire changes the surge impedance significantl
Hi Mike I have not considered the temperature coefficient of the core. That is a great suggestion. I did find some generic plots of permeability vs temperature and there can be a big change. The data
Would it not be as simple (at least to prove that some temperature coefficient does exist) to just take a sample core, put a number of turns through it, measure it's impedance on a VNA at room temper
I have not considered the temperature coefficient of the core. That is a great suggestion. I did find some generic plots of permeability vs temperature and there can be a big change. The data sheet f
Thanks Jim! I didn't look at the Fair Rite catalog, but yesits there on page 8. I am using 73 material Binocular cores. The temp. coefficient for 73 material is .65 % per deg C. My temp change is abo
I didn't look at the Fair Rite catalog, but yesits there on page 8. I am using 73 material Binocular cores. The temp. coefficient for 73 material is .65 % per deg C. My temp change is about 50 deg C,
How important is the matching transformer on a Beverage? I am not a RX antenna guru, I only have installed simple temporary contest Beverages any place where I could hang the wire in desired directio
Author: Jon Zaimes via TowerTalk <towertalk@contesting.com>
Date: Thu, 23 Jan 2020 08:16:49 -0500
John, I have, when a transformer had blown and I didn't have a spare handy, hooked the coax center conductor up directly to the Beverage wire. Output will be down due to the mismatch, but it still wo
Interesting Jon. I imagine that a Beverage is like a Yagi in that it basically wants to work but it can be fine tuned for better efficiency. I have never checked the impedance of my temporary Beverag
Yes, and that will degrade it's performance, which is really a matter of beamwidth, not voltage output. 73, Jim K9YC _______________________________________________ __________________________________