<< |
DIY blanc PCB set
for Youtube
video presentations : |
To prevent un-authorized commercial copies, NO component details are given in the schematic diagrams below.
The parts list will coincide with the white PCB topsilk imprints
at the PCBs, and part
placement drawings.
Installing all parts should be easy for
experienced builders.
Construction details, test data and de-noising instructions are given in the
downloadable texts.
|
|||||
|
Measured properties :
Bandwidth : 5kHz to 148MHz +0/-3dB.
Sensitivity (< 30MHz) :
- 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).
IMPORTANT : |
|
UPDATES
20200828 Picture 2 : THIN coax, RG178 or RG316 Check the insulation between
: -------------------------- Splitter
unit. |
>> |
|
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 (L1 on the antenna PCB is sort circuited)..
|