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Balun Designs

Model 4130 - QRP 4:1 Unun 1.5 - 54 MHz - 300 watts

$47.95

Model 4130 - QRP 4:1 Unun 1.5 - 54 MHz - 300 watts

$47.95
SKU:
4130
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Product Description

Designed for use with wire antennas, this unun is small, compact and perfect for quick portable/emergency installations. This 4:1 Unun (200-50 ohms) will easily handle 300 watts and covers 1.5 - 54 MHz. Using this unun will allow transceivers with internal antenna tuners to work most HF bands.  A 28-31  foot wire will allow 40 thru 10 meter coverage and a 43-50 foot wire will provide access to 80 thru 10 meters.  A good ground or counterpoise is also required.

This model also works well with the
S9 vertical and the wing nut model makes setup and breakdown quick and easy.  If your vertical is 43 foot in height, consider the model 4134s.  This unit provides the additional reactance for increased performance on the lower bands and also provides a weatherproof enclosure.

**CAUTION**

The enclosure for the low power units is small, lightweight and portable, but NOT intended for long term or permanent outdoor use. If used in a long term outdoor installation, additional attention must be given to weatherproofing and possible strain relief. Damage caused by such use is not covered under our lifetime warranty.

Be sure to look at the unique mounts available for the QRP line of baluns

Specifications


 

  Core Material   Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
  Core is coated and sealed for long term durability.
  Winding Type   Single core with single bifilar wire pair wound as 4:1 unun.
  Winding Material   Bifilar winding of silver flashed 18 gauge Teflon insulated wire. 
  5000v breakdown voltage
 
  Power Rating   1.5 to 35 MHz - 300 watts, 35 to 54 MHz - 200 watts.  
  All ratings based on resonant load. High SWR will reduce power handling ability.
  Useable Frequency   1.5 to 54 MHz
  Insertion Loss   Less than .02db
  Connectors   SO-239 connectors are silver plated with Teflon insulation.
  Alternate connectors and Mounting Options are available in the Accessories section.
  Hardware   All Stainless Steel
  Enclosure Type   Polycarbonate (ABS) box with bottom plate that fits flush with the case
  Plate is an exceptional fit that can be easily weatherproofed if desired.
  Dimensions   Very compact 3x2x1.5 inch
  Additional Info   Very high efficiency (98-99%).