Description
These Techoman 49:1 baluns / ununs are designed to efficiently match the high impedance (~2450 ohms) of an end-fed half-wave (EFHW) antenna to the 50-ohm impedance of standard 50 ohm coaxial feedlines and HF transceivers.
Features and Specifications:
Frequency Bandwidth: 1.8 to 30 MHz Efficient power transfer between the radio and the antenna, Improved radiation efficiency on multiple amateur radio bands, Typically allows the EFHW antenna to operate on harmonically related bands (e.g., 10m, 20m, 40m, 80m) with minimal need for an antenna tuner or in some cases no tuner. Maximum transmit power: 100 watts PEP (SSB); 20 watts Data ICAS.
The 49:1 balun / unun steps down the impedance as follows:
EFHW antenna at resonance: ~2450 ohms (on its resonant frequency), 49:1 transformation ratio: v49 = 7:1 voltage ratio ? 7² = 49:1 impedance ratio, Resulting in: 2450 ohms ÷ 49 ˜ 50 ohms, which matches the coax and transceiver.
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Details
Shipping & pick-up options
| Destination & description | Price | |
|---|---|---|
| Nationwide 2-3 days, Standard | $9.00 | |
| Nationwide 2-3 days, Standard, Signature | $12.50 | |
| Nationwide 5-8 days, Rural Economy | $14.50 | |
| Nationwide 5-8 days, Rural Economy, Signature | $18.00 | |
| Combine with another item you've paid shipping on | $0.00 | |
| Shipping more than one item | No extra charge | |
| Pick-up available from Christchurch City, Canterbury | Free | |
Estimated delivery times in business days
Payment Options
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Questions & Answers
TECHOMAN Balun / UnUn 49:1 For End Fed HF Half Wave Antenna / Aerial 100 Watts
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