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OP-DES (Opposing Phase - Driven Element System)
The OP-DES (Opposing Phase - Driven Element System) Yagi is another development of Justin Johnson, G0KSC. The OP-DES Yagi has been specifically developed for HF applications where bandwidth and performance within one package is difficult to come by.
Some of the key OP-DES Yagi benefits are listed below:Opposing Phase Driven Element System
Reduces side lobes and helps provide a much wider band antenna with constant performance characteristics
50Ω Direct Feed - No Matching Loss
The OP-DES Yagi has been carefully Computer Optimised with the 'bent' Driven element in place to ensure a 50Ω feed-point. This ensures no matching loss and minimal resistive (Ohmic) loss
High F/B ratio
as with the LFA and OWL, the OP-DES Yagi has an exceptional Front to Back ratio for a direct-feed, 50Ω Yagi. Get rid of unwanted signals from behind your antenna!
Super Wide Bandwidth
The broadest bandwidth of all our antennas, the OP-DES is best suited to HF applications where performance and bandwidth is needed in a single package.
Constant Impedance & 'All-Weather' Stability
Following the LFA and OWL, the OP-DES Yagi is able to maintain impedance in wet weather and therefore will not de-tune like other antennas can
Class-Leading Direct Feed Yagi Performance
For a given boom length, we believe the OP-DES Yagi provides superior all-round performance than any other HF direct feed Yagi.
Simple SWR Fine-Tuning Feature
No two locations for an antenna are the same. With this in mind the requirements of the perfectionist as well as the every day user in our sights, the driven element of the OP-DES has adjustable end sections to allow for very simple SWR fine-tuning
The Most Important Part of your Receiver has to be The Best
Your antenna is a part of your receiver and arguably the most important part of your station. You have spent thousands on radio equipment, make sure you don't short-change your set-up by choosing anything else other than the InnovAntennas OP-DES Yagi for HF
The Unique U shaped driven element of the OP-DES can be clearly seen in the Illustration below (pink lines denote current distribution) and it is the bends at the ends of the OP-DES driven element that enhance the performance of the OWA 50Ω split dipole Yagi in order to achieve never-seen-before performance. The OP-DES is highly suited for applications requiring very wide bandwidth and consistent performance throughout. It is extremely easy to fine-tune with the OP-DES supporting adjustable end tips and to complete the package, a simple 1:1 choke balun (a few turns of coax) at the feed-point is all that is needed for the antenna to be goodto go.
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