Re: Hobby LF/MF broadcasting
Posted by Albert H on February 9, 2018, 8:09 pm, in reply to "Re: Hobby LF/MF broadcasting"
The shortest AM broadcast antenna that I've seen work with any real efficiency was a 16m high coil, about 8cm diameter, with a gigantic capacity "hat" that was supported by guylines - the upper part of each guy was wire. It was over a large chicken-wire ground mat. When fed by a suitable network, it matched the 50Ω TX output pretty well. We ran 20W carrier / 100W peak (I like loud positive-going mod!) into it. From our field in Limburg in the Netherlands, we got daytime reports from the UK, Germany, France, Belgium and even Poland!
If there's going to be any legal hobby broadcasting on the MW in the UK, it'll be limited to (probably) 250mW carrier, and the antenna size will be limited. The transmitters will also have to be type-approved, so will be stupidly expensive.
Message Thread | This response ↓|
- Hobby LF/MF broadcasting - Dave Martin Admin January 27, 2018, 5:48 pm
- Re: Hobby LF/MF broadcasting - Fred Bramley January 27, 2018, 5:51 pm
- Re: Hobby LF/MF broadcasting - David January 27, 2018, 6:57 pm
- Re: Hobby LF/MF broadcasting - Fred Bramley January 27, 2018, 10:18 pm
- Re: Hobby LF/MF broadcasting - David-G1ZQC January 30, 2018, 2:21 am
- Re: Hobby LF/MF broadcasting - Dave Martin January 30, 2018, 6:32 am
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