Model 4145d - 4:1 Upgrade Balun for Drake B-1000

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For those of you who own one of the fine tuners manufactured by Drake, this is a balun that can be easily installed on circuit board in place of the original windings. Not only do you receive a balun capable of much more power, you also benefit from the enhanced performance this custom winding provides.

The balun comes completely wound with tinned leads and ready to be soldered to the connection pads of your PC board. Only a screwdriver and 100 watt soldering iron are required for installation. If you prefer not to do the installation, Balun Designs can install the uprade for $5.00 additional. Please call to make arrangements.

Note: This listing is for the balun only and does not include the PC board

 Please review the test scans below to understand the performance enhancement this balun offers.

drake-standard-thumb.jpg drake-retrofit-thumb.jpg
All testing done with AIM-4170 Network Analyzer

Installation Notes for Drake Upgrade Balun



  Core Material   Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
   Large 2.4 inch cores are coated and sealed for long term durability.
  Winding Type   Stacked cores with single bifilar pair configured as 4:1 tuner balun.
  Connections configured for external PC board utilized by Drake tuners.
  Winding Material   1 bifilar winding of 14 gauge Heavy build polyamideimide Allex 240 Winding Wire
  Windings are inserted into Teflon tubes increasing total breakdown to 10,000 volts.  
  Power Rating   1 to 35 MHz - 5kW, 7kW intermittent.  35 to 54 MHz - 3kW.  
  All ratings based on resonant load. High SWR will reduce power handling ability.
  Useable Frequency   1 to 54 MHz
  Insertion Loss   Less than .01db
  Connectors   Tinned prebent leads.
  Hardware   All Stainless Steel
  Enclosure Type   N/A
  Dimensions   N/A
  Additional Info   Very high efficiency (98-99%). 

Installation Notes for Drake Balun