Genuine Red Pitaya 14:1 Impedance Transformer Optimized for connecting HF antennas to the STEMlab 125 series
Steps up 50 ohm antennas and pre-amps to the high impedance inputs Improves sensitivity and performance
Less than 1 dB insertion loss from 2-50 MHz
How to use
Place a jumper across pins 2 and 5 of each input to bypass the internal attenuators, then connect the transformer:
Features
Gold-plated male and female SMA connectors
Shrink-wrap insulation
Small and compact, room for one on each of the two antenna inputs
Low insertion loss using aMiniCircuits® T14-1wideband step-up RF transformer
What's Inside?
One example of Improved Performance
Using a passive antenna (VE3DO loop) with a Clifton Labs Z10042 11 dB Norton amplifier connected directly to Red Pitaya at N6TV, strong intermodulation from two nearby FM broadcast stations on 92.3 and 106.5 MHz was clearly visible (106.5 - 92.3 = 14.2 MHz):
Inserting the 14:1 transformer between the pre-amp and the Red Pitaya reduced the intermod significantly, and atmospheric band noise (wideband sensitivity) improved by about 4 dB: