high-level accessory front end for the HF amateur bands

Posted on Feb 6, 2014

Here`s an antenna selector, Preselector, attenuator, preamplifier accessory for every HF amateur transceiver. It can improve your receiver`s IP2 for out-of-band signals and yield good flexibility. My father, I4FAF (an old-timer) and I both very much like Amateur Radio as a lifetime endeavor. We do not have backgrounds in electronic engineering,

high-level accessory front end for the HF amateur bands
Click here to download the full size of the above Circuit.

but we do have a lot of practice. My father is a fast builder ofAmateur Radio projects, from printed-circuit artwork drawn by him with CAD software to working units in our home laboratory. Being retired now, he has more time and I help him from time to time. Our goal is to get more from the Amateur Radio equipment available to us. Our gear is average, not toppriced. I want to improve my skills with DX or weak signals, while I operate in crowded bands during some international contests. Lately, I have discovered the low-frequency bands. They have added more fun. In 2000, we started to put up (at a flat, country location) a short vertical antenna by Butternut, the HF2V It has the 160-meter coil kit, is top-loaded with four wires (each about 5 meters long) and has six ground radials about 40 meters long for 160, 80 and 40 meters. In winter 2001/2002, we started to test some receive-only antennas, with better signal-to-noise ratios and some directivity, in comparison to the 360 ° radiation pattern of a vertical antenna. With the exception of Beverage and a four short vertical system presented by W8JI on his Web site, that still require much space for only -6 to -11dBi; most of the receive-only antennas we have considered are in the low-output category-in the range from -6 to -35 dBi. We have worked with Beverages, EWE, the delta-EWE by K6SE -a variation of pennant-flag antennas and K9AY loops. We have seen them presented by...

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    AF counter circuits
    Yamaha Wiring System
    Voltage Controlled Oscillator
    7MHz CW transceiver made with Motrola MC3362P
    Automatic UPS system wiring circuit diagram (New Design Very simple) for Home or Office
    LED level meter driver IC Fig.
    Automatic lighting control circuit diagram composed of optocouplers