Common Emitter Transformer Feedback Amplifier

ZTX327 Transistor

Shielded enclosure Master Lock Cache Box Two point lid bonding to bottom BNC Through adapters Amplifier using BN-73-302 Cores VNWA with 30dB Preamp and RFD-2315 = 1.6dB NF HP 8970A Noise Meter with similar enclosure = 10MHz, Gain = +21.82dB, NF = 1.67dB NF Current Versus OIP3

VNWA |Z| in and Gain

Evaluate with Bias-T

Bias-T Inductor = 470uH at 160mA Bourns RLB0812-471KL

Additional Devices

Using ZTX327 baord above Diotec 2N4401, Mouser 637-2N4401 NF Measurement: 10MHz Gain=21.86dB NF=2.7dB HP Noise Figure Meter: 10Mc Gain=+21.68dB NF=3.08dB (AA7U) Motorola 2N4401 "652" NF Measurement: 10MHz Gain=22.11dB NF=1.65dB HP Noise Figure Meter: 10Mc Gain=+21.89 NF=1.89dB (AA7U) 2SC5551 HP Noise Figure Meter: 10Mc Gain=+22.27 NF=1.45dB (AA7U) BFU590 HP Noise Figure Meter: 10Mc Gain=+22.06 NF=2.04dB (AA7U)

2N5109 Breadboard

Noise Figure Measurements

Using VNWA and Enclosure above = 2.1dB NF

VNWA Input S11 and S21 Gain