Model 9110 - 9:1 Receive Only Balun - 1.5 - 31 MHz

While primarily designed for use with a "Loop on Ground" antenna, this is an excellent 9:1 isolation balun for any receive application.  Separate input and output windings provide a high level of isolation and noise reduction and to maximize performance, two mix 77 ferrite beads are permanently joined together to form a binocular ferrite to better accommodate the windings for the unit.

We use 77 material because it's the optimum material for the build. This ferrite material is lower loss than the more common 73 mix, has a permeability that places the "sweet spot" of performance in the low bands and is perfect for use with a LoG for receive on 160 & 80m. The number of turns results in lowest loss in the frequency range of the 160M and 80M bands.

Loss is 0.2 to 0.3 dB from the AM Broadcast band through the 20M ham band. With a 450 ohm resistor across the secondary, the primary will have a VSWR of 1.2 maximum from below the AM Broadcast band to 30 MHz. This transformer can also be used as-is with 75-ohm line, the extra loss due to mismatch is so low that you will never measure the difference except on the test bench. Note that this type of antenna typically requires a transceiver with a separate receive preamp or an external peramp to bring signal strength up to normal levels.

 **CAUTION**

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

 
Dipole mount and alternate RF connectors are available in "Accessories & Connectors" section of our website

Specifications

Installation Notes