This 1:2 BalUn uses a symmetrical 1:2 impedance transformer. The 1:2 BalUn 600 Watts is suitable for QRO use. The most important reason to use a good BalUn is to ensure that the coax cable does not become part of the antenna system and therefore radiates as well. This has all sorts of nasty effects, think of: interference, EMI, RFI disrupted unadilla w2au baluns resistors product registration r10ca contact us e gift cards insulators t3fd-140 a assembled dri-shield 3000 esd emp t3fd-120hdss 16:1 1500 watt palomar balun brand new two free end insulators $139.99 $99.99 only a few left! on sale on sale 12:1 1500 watt palomar balun brand new two free end insulators The W2AU balun was hung from the top of the pole, and the entire setup looked quite professionally done. The feedline was run into a tent for field day. SWR Measurements: SWR of NI4L's 7 Band OCF Dipole Antenna. The SWR measurements were taken at the end of the feedline, not at the W2AU balun feed point. I apologize for the poor photos of the W2AU THE BIG SIGNAL - W2DU MAXI-BALUN - New in Box, with Instructions, HAM RADIO | eBay People who viewed this item also viewed Showing Slide 1 of 1 Tokyo hy-power brand Ham Radio Antenna $9.99 + $5.30 shipping Ham Radio Antenna brand maldol AH-14 $9.99 + $5.30 shipping MLA-30 Active Loop Antenna $26.00 + $6.00 shipping The Unadilla W2AU 40/80 5 Band Antenna Kit is a perfect dipole for 40 and 80 meters. Plus it can be operated on 10, 15 and 20 meters with your antenna tuner. This kit includes: 2 each W2VS Reyco KW-40 Traps 1 each W2AU "Big Singal" Balun 1:1 2 each W2AU Shatterproof End-sulators 1 each Instructions The W2AU balun is used with a pair of 40M traps to create a multiband dipole antenna capable of operating on 80, 40, 20, 15 and 10 meters. It is approximately 110 feet in length and provides a relatively low SWR on these bands. The instructions give suggestions for wire lengths for general coverage on most of the HF bands, but I optimized The balun's enclosure measures 3" x 2" x 1". These are very efficient baluns and maintains a flat SWR curve over the entire HF frequency range when terminated into a 200-ohm matched load. It uses dual ferrite cores and can handle 250 watts continuous and up to 350 watts peaks in a matched condition. These ratings are good up to a 2:1 SWR. W2du-vhf Unadilla 1 Ratio Current Balun (47.3% similar) Unadilla w2du-vhf 1:1 vhf dipole current balun the big signal. The internal feed line passes through ferrite beads which prevent rf current from flowing on coax shield as with any retail business, we can sometimes run out of certain items before remove listing. The balun is mounted so the terminals will be horizontal with the antenna elements. I should also mention that the balun was purchased at a hamfest for $2.00, so now we're just below $10.00 on this project. At the right you can see that the balun rests on the end, and the ty-wraps hold it in place. I didn't see any need to groove the end of the The plots above show with a DX Engineering 4:1 balun and reasonably good coaxial cable, you can operate a loop over most of 80 and all of 40 meters. This system is generally good on 80, 40, 20, 15 and 12 meters. Vertical or Horizontal Loop: The best balun for operation moderately far from resonance or on harmonics is a 4:1 ratio current Tuner W2AU Baluns are transformer designs with ferrite cores to provide 95% minimum coupling efficiency. Each has a built-in lightning arrestor, and 600 lbs of pull