PA0RDT Mini Whip
2 versions of the PA0RDT Mini Whip.
See Electron May 2006 for schema and description.
Version 1
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|
| Without enclosures |
With enclosures |
Details:
- Antenna size is 45x50 mm (PCB happened to have that size)
- FET is a BF245C (no J310 available)
- 2N2219A transistor (no 2N5109 available)
- No 10uH coil at input
- 470 uH coils are 35 turns on a FT50-43.
- Double sided PCB. Unused side is floating.
- Alternative enclosures
Version 2
|
|
| Without enclosure |
With enclosure |
Details;
- FET is a J310
- 2N2219A transistor (no 2N5109 available)
- No 10uH coil at input
- Single sided PCB
- Alternative enclosure
Comparison and Impressions
- Version 1 signal strength is S9+20db compared to S9+10db for version 2
on longwave (198KHz) on a AR3000A (location: Noord Holland, the Netherlands,
whip mounted on a 5m fishing pole.).
- It looks as if version 2 has a stronger signal at high frequencies
(25-30MHz)
TODO: add input coil to both versions.
