{{tag>elektronik amateurfunk 2013}}
~~META:date created = 2013-01-01~~
~~META:date modified = 2013-01-01~~
1. Januar 2013
= Dummy Load 50 Ω
50 Kohleschichtwiderstände zu 0.25 W in einer kleinen Alubox mit einer BNC-Buchse ergeben eine Dummy Load für Hochfrequenz und 12 W Dauerlast.
This is our first try at building an HF dummy load -- if we don't count simple pairs of 100 Ω wire-wound resistors, which are not really suited for high frequency. 50 carbon film resistors (0.25 W) are distributed on both sides a small piece of circuit board and placed inside a small Teko aluminium enclosure fitted with a BNC jack.
This should give us 12 watts in theory, but see below what happened.
== Bilder -- Pictures
[{{ :blog:2013:hf-dummyload:20130219-095952.jpg?512&noredirect |Können 4 Watt das Lötzinn zum Schmelzen bringen? -- Can 4 watts melt soldering joints?}}]
[{{ :blog:2013:hf-dummyload:20130219-100121.jpg?512&noredirect |Es sieht so aus... -- Well, I guess so...}}]
== Technische Daten -- Technical Data
^ Größe -- Dimension ^ Wert -- Value ^
| Frequenzbereich -- Frequency | ca. DC--30 MHz ? |
| Dauerleistung -- Continuous power | 12 W ?? |