Dual ferrite bead variable 9:1 unun for end fed long wire, 4:1 balun for dipole.

Description

After months of experimenting, I am offering up a different style of 9:1 unun. They are different in that they don't use the traditional toroidal core that you may be use to. The ones I'm offering up utilize ferrite beads that work very well. They are fashioned binocular style like you might find in amplifiers as coupling transformers. Mine use a lot less wire (28") than toroidal ones. The core material approximates type 43 which can cover a wide frequency range. I have found that the few turns of wire used only allows good performance in the upper HF bands, (40-6 meters), To cover 80-160 meters, more inductance is required, therefore a core size to handle more turns. I'm offering up those in a separate listing. My low price on these reflect minimal component cost and my ambition to get them "out there". Their simplicity allows the user to change the secondary with ease. They are initially wound with a 1 turn primary and 5.5 turns on the secondary. A half or one turn. more or less can easily be added to minimize SWR on 40, 20 and 15 but will detract on 10 and 6 somewhat. 3.5 turns works best on them. I've been able to get good readings, (SWR and Imp), with one antenna length, (33' to 66'), that will cover all upper bands, Antenna lengths can vary depending on how deployed, i.e. vertical, sloper, inverted "L" all work well but will need to be experimented with to achieve maximum performance. Impedance ratio will also vary to optimize a good match. I was amazed how well they work, as well or better than powdered iron toroids, and surprised at their power handling ability. (up to 100 watts). Great for QRP as well! comes with SO-239 and application sheet to wind your own with different ratios and as a balun, Can be enclosed nicely in 2 back-to-back 1" PVC caps.
(not included)
.  For details on deployment, refer to the many web sites that deal with random wire ununs that use traditional toroid cores. Please message me if you have questions.
Note: I have added a picture of a 4:1 balun configuation. The data sheet depicts balun winds but I hadn't shown one. I tested using my Buddipole configured as a off center fed dipole. It measured close to a perfect 1:1 match and 48 ohms.
Comparable
to my Triple Ratio Balun* but has much broader tuning. BNC connector available on request. *Buddipole knockoff. (TRB-1B)
NOTE, price increase due to the new vendor jacking core price way up.