Pa0nhc improved version of
pa0rdt "Miniwhip" active wideband receiving antenna.
video presentations :
To prevent un-authorized commercial
copies, NO component details are given in the schematic diagrams below.
No Gerber nor PNG PCB files will be provided.
All copies sold at other sites, which refer to my call, and for details to my internet site, are illegal.
Installing parts should be easy for
Both parts lists will coincide with the white PCB topsilk imprints and part placement drawings.
Construction details, test data and de-noising instructions are given in the downloadable texts.
Bandwidth : 5kHz to 148MHz +0/-3dB.
- Using the internal antenna surface only : abt. -17dB.
- With added external 1,5m x 1cm antenna rod : abt. -12dB.
Input RF impedance abt. 7 Mohm // 6pF.
Input DC resistance 22 Mohm.
Includes over-voltage protection.
Output impedance : 50 Ohms asymmetrical.
This version Miniwhip :
Is an excellent DX antenna for vertically polarized wide band reception of :
VLF,LW,MW,SW,FM broadcast, airplane band and 2m amateur band.
However : => Between 1.8MHz and 7MHz, the reception of regional signals (20-400km range) will be weaker. <==
The Miniwhip is NOT an NVIS antenna (like every vertically polarized antenna).
Every active receiving antenna needs careful de-noising measures.
E-field antennas (like this Miniwhip) also must be connected to a dedicated, noise free ground.
1. This CMC is most effective
if wound with a maximal number of turns
firmly twisted lacquered wires.
The transmission line impedance
of the twisted line is then abt. 50 Ohms !
2. Coax version with maximal number of turns
thinnest 50 Ohms coax
(RG174, or RG316 or thinner).
Picture 2 : THIN coax, RG178 or RG316
Check the insulation between
Unique pa0nhc antenna input circuit for highest IMD-free output, widest bandwidth,
and a wideband output circuit including an effective common mode choke.
Measured frequency characteristics.