Fig. 3. With such gain up to many 100s MHZ, a low-pass filter is a must, otherwise strong local signals may come in and interfere. This is the reason for placing the 30 MHZ LPF on board. The toroids are T94-6 to offer strong IMD immunity.

Option 2:

Option 2 adds the balanced input, it consists of 2 RF relays and 2 BALUN transformers wound for 100 to 25 Ohm impedance transformation.

Option 1 and option 2 can co-exist                 EUR 29.00

Fig. 1. Gain curve over 9 KHZ - 30 MHZ
Fig. 2. Close look at VLF/LF

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DXer's High-Linearity Pre-Amp (LNA) for HF Receivers

  • 4 x GALI-74+

  • Balanced input Option

  • Multicoupler Output Option for 4 HF Receivers

  • Low-Pass Filter at the un-balanced input

  • IN/OUT Relay

  • DC through coax (Bias-Tee)

Option 1:

Option 1 adds a Mini-Circuits 4-way splitter at the output.

Rx1 port can still accept DC through the coax to activate the LNA if no local DC power is available         EUR 99.00

A completely built & tested Module is at EUR 129.00 without  VAT 24% with EUR 15.99 shipping from Greece (EU). 

The 24% VAT is only applicable to individual buyers from the EU countries.

The shipping is with Registered Mail with tracking info. It usually takes about 2-3 days for Europe and 8-10 days for USA/Canada.