HTOOL HT004A LNA Modifications

HT004A:
+30dB of RF Gain at 1000MHz-3300MHz
Bandwidth: 100K-6GHz
Max Output Power: + 20dBm (100mW) @ 1dB compression point

Purchasing:

• HTOOL HT004A on Taobao
• HTOOL HT004A on AliExpress

• Input LNA (Q1): Qorvo (Triquint) TQP3M9008 50 - 4000 MHz High Linearity Low Noise Amplifier Gain Block
  • 50 - 4000 MHz
  • 20.6 dB gain, 1.3 dB NF
  • 5 V, 85 mA
• Output PA (Q2): Qorvo (Sirenza) SBB4089Z 50 - 6000 MHz Cascadable InGaP HBT Active Bias MMIC Amplifier
  • 50 - 6000 MHz
  • 15 dB gain, 4.5 dB NF
  • 5 V, 80 mA
• Battery charging IC (U1): TOPPOWER TP4056

• Gain block upgrade
  • Replace TQP3M9008 to TQP3M9009, Δ+1.2 dB gain, Δ+3.5 dB OIP3
  • Replace SBB4089Z to SBB5089Z, Δ-0.2 dB NF, higher OIP3 gain
  • Perhaps SBB1089Z would be even better for satellite reception because of the narrower frequency range of 50 - 850 MHz
• Charging circuit delete (no battery SKUs still ship with the charging circuit)
  
  • Remove U1 TP4056 (reduce noise)
  • Remove R3, C6, C11
  • Remove D1 and short with wire jumper (reduce noise and increase gain by removing supply voltage drop)