Andrew Ikin of Wellbrook for a short time offered a version of the ALA1530LN with an additional 9 dB gain Norton preamp in the receiver coupler--this version was called the ALA1530LNP. He developed this version which used two transformers.? I've uploaded the schematic into a new folder in the Files.
/g/loopantennas/files/Wellbrook%2050%20ohm%20Norton%20Preamp He used the now-discontinued ZTX 327 transistor, but any good RF transistor can be used.
73,
Steve AA7U
