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  • 49:1 impedance transformer UNUN 250 Watts

49:1 impedance transformer UNUN 250 Watts

  • Brand: Wire Antennas UK
  • Product Code: 49:1-impedance-transformer-UNUN
  • Availability: 4

  • £48.00

  • Ex Tax: £48.00

6 reviews / Write a review

An impedance transformer (49:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50Ω (unbalanced) coaxial input. 200 watts

This is a unun ( unbalanced to unbalanced ) transmission line transformer designed to match 2500Ω  to 50Ω .

It has a constant impedance transformation ratio of 49:1 from 1.81 MHz to 29.5MHz. 

 

Technical specification :

Type :                                               49:1 Unun
Frequency :                                      1.81 MHz – 30MHz
Impedance ratio:                              1:49
Input Impedance:                             50Ω
Output Impedance:                          2500Ω
Power Handling(CW/SSB) :             250W
Core Type :                                     1x   FT240-43 by Fair-rite® Co.
Capacitor 100pF 3KV
Assembled and tested.

 


This is a unun ( unbalanced to unbalanced ) transmission line transformer designed to match 3200Ω  to 50Ω .
It has a constant impedance transformation ratio of 49:1 from 3.5MHz to 29.5MHz.

Technical specification :
Type :                                               49:1 Unun
Frequency :                                      1.81 MHz – 29.5MHz
Impedance ratio:                              49:1
Input Impedance:                             50Ω
Output Impedance:                          2450Ω
Power Handling(CW/SSB) :             200W  of peak power

Core Type :                                    1x  FT240-43 by Fair-rite® Co.

Capacitor 100pF 3KV

Assembled and tested.

 

This transformer requires a feed line choke to isolate the coax feed line from the antenna.


UNUN Balun 49:1  Type 43 core material giving extremely flat bandwidth.
Note these cores are expensive and beware cheap 49:1's will not perform as you expect.
Low Insertion Loss and exceptional match across all HF bands.
Stainless steel hardware. 
Wire is Class H 212 Deg Celsius double coat enamel.
Sealed weatherproof box  Usable Frequency Range 160m to 10m.
High Quality means paying for what you get  Cheap = very inefficient = very hot.
Would you connect anything less to your expensive radio equipment. 

We offer good product customer support.







 The impedance of  the unun isaround 2500 Ohm, is transformes to an impedance of 50 Ohm. This impedance suits best to most tranceivers. The transformer consists of 2 primary windings and from 14 secondary windings.

This gives a ratio of 1 to 7. The voltage is therefore seven times higher than the source voltage and the current is seven times lower than the source current.

This results in an impedance transformation of 7 x 7 = 49. That increases the impedance of 50 Ohm by a factor of 49, that makes it a total of 2450 Ohms.

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