Pa0nhc again improved version of
Pa0rdt "Miniwhip" active wideband receiving antenna.
20171221 20180121 20180216
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thereby explicitly stating my radio amateur call sign "PA0NHC"
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I do not publish"Miniwhip" schematics
From Ukraine a copy of an older design of me is sold
It is not approved by me. I have no contact with them.
I doubt its quality, as some small SMD components on it cannot be the absolutely needed good
quality FOIL or NP0 capacitors, i think.
The specifications of the here presented new version are far
better than those of that not approved SMD copy.
Compare my large-signal properties (measured by pa3fwm)
and the used component quality.
New, longer antenna PCB, with on-board mantle current choke, and adapted for a wider
low frequency range..
New splitter PCB, adapted for a wider low frequency range
50 mm dia.
PVC pipe, 50 cm long, serves as housing.
With the antenna PCB glued into the top cap, assembling, disassembling and
The red wire is for grounding the antenna PCB to the
The mantle current choke is now situated on the new PCB.
As mast clamps will be situated
below the PCB location, they could be metal too, for instance stainless steel
Both caps should be sealed drip water tight, by gluing, taping or greasing.
The coax and ground wire pass the bottom cap through rubber grommets.
A third small hole in the bottom cap could drain moisture.
Thin 2.8 mm R174 coax can be used up to a length of 50m.
It will attenuate frequencies above 50 MHz, which can be an advantage.
It then acts as a low pass filter.
Thin coax is more effective in ferrite cores, by winding more turns.