samedi 29 juillet 2023

How to make a low power AM radio on medium wave ?

You ne

https://www.alfalima.net/viewforum.php?f=10

There are still many Dutch pirate radio stations, mostly located in rural areas. It has been claimed^[where?] that in 2011 approx 50% of all European Pirate Stations are located in the East-Netherlands. Especially the provinces of Overijssel, Friesland and Drenthe have a lot of pirate stations, as well as western Brabant. Most of the pirate radio stations air the so called "pirate music", traditional Dutch folk music combined with classic English, German and Polka. Most operate on FM, but some can be found particularly 1611 to 1700 kHz. Like many other European countries another hotspot is the 48 meter-band on Shortwave radio. The frequency is 6200-6500 kHz. Some can be found in the American part of the band (6900-7000) but is rare. There are about ~40 Pirate radio stations based in the Netherlands alone.

https://en.wikipedia.org/wiki/Pirate_radio_in_Europe

https://icomjapan.blogspot.com/2023/07/my-favorite-radio-stations-on-short-and.html

https://www.ontheair3.com/index1.html

https://en.wikipedia.org/wiki/Pirate_radio_in_Europe
ed to check ia Broadcasting Licence to opt in

The transmitter 1 watt for Low Power AM radio station

https://www.6v6.co.uk/transmitters/solid-state-transmitters/mosquito-am-one-watt-transmitter-us.html

DK1OF make a low power AM radio

https://am-radio-stations.de/en/medium-wave-transmitter-joe/

Mosquito 1 Watt Plus AM Transmitter

The Mosquito 1 Watt AM Transmitter has been designed to cater for the new 1 Watt Low Power AM standards being introduced worldwide, (for example in Scandinavia and the Netherlands).

Using Class E technology, with extremely linear modulation characteristics, suited for high quality, amplitude modulation.

The output is protected from a short circuit to ground, and also has over current and thermal shutdown to protect the output stage if the antenna is badly tuned.

Specifications

Frequency: 1000-1720kHz MW & 160M Band
Power Output: 1 Watt Plus
Output Protection: Short Circuit and Thermal
Audio input: Mono or Stereo signal
Audio connector: 3.5mm Jack Socket
Antenna: 50 Ohm Impedance
Antenna connector: RCA Phono or BNC
Crystal controlled: 9KHz Channels for Europe (10KHz vesrsion available for the USA)
Built in Antenna and Modulation monitor
Power Input: 15 VDC at < 400mA (Regulated)
Power connector: 2.1mm coaxial (tip positive)
External Ground Connections
Devices: 4 x IC, 2 x Transistor and 3 x MOSFET

The Mosquito transmitter is ready built and ready to run...at an affordable price...with the performance and features of units costing many times the price...!

The Mosquito employs a crystal controlled frequency synthesizer for accurate tuning and drift free frequency stability.

The Mosquito employs "Class E" output technology and provides the full 1 Watt carrier, the modulator stages includes both over current and thermal shutdown.

The Mosquito also has a two channel mixer for either Stereo to Mono or twin channel Mono audio sources.

The Mosquito printed circuit board uses a grounding technique that splits the RF and Audio grounds, as well as providing and external grounding point. In addition a new external "universal"power supply provides regulated DC power to the transmitter, supplied with county specific power leads for the EU.

Fully Built and Tested: High Quality PCB, Plastic CASE to IP56
AC Power Adapter: Power Supply 12-15V DC 90-240V AC 50-60 Hz
Audio Cables included.
Stereo 3.5mm jack to twin RCA (Phono)

Compliance

This product is available for shipping to

The Netherlands: for use in the Netherlands for a “laagvermogen AM” (LPAM) license granted by Agentschap Telecom.
Scandinavia: Sweden, Norway, Denmark & Findland
Worldwide subject to any country specific regulations
Exemple of antenna for low power AM radio station http://www.lpam.nl/antennes.html

https://de-radio-amateur.nl/lpam-antenne

EU R&TTE directive and EMC Directive 2004/108/EC - in order to purchase this item, you must agree that:-

1. For use in the Netherlands for a “laagvermogen AM” (LPAM) license granted by Agentschap Telecom.
or
2. The item will only be used within a completely RF screened and shielded metal enclosure or environment for testing, evaluation, experimental or laboratory purposes and any other use that does not radiate electro-magnetic waves into free space.
I am not an unqualified end user and I have RF engineering and electromagnetic compatibility skills at my disposal.
or
3. You intend to export the item to an address outside the European Union. Under no circumstances will this item be resold or put into service within the European Union.
or
4. For use by a Licensed Radio Amateur on 160M Band

For europe https://www.6v6.co.uk/transmitters/solid-state-transmitters/hurricane-intelligent-am-medium-wave-transmitter-eu.html

Tornado HF200 Antenna

The Tornado HF200 Antenna is a long wire antenna incorporating a 9:1 UNUN at the feed point enabling it to be fed directly with 50 ohm coaxial cable.

It has been designed to complement the Tornado Transmitter operating on Medium Wave (1.2 Mhz to 1.7 MHz) just using the Tornado's Auto Tune feature.

At 50m in length (can be shortened) this antenna is capable of operating on all bands from 238m (1.2Mhz) upwards (an external ATU may be required on SW bands)

It may be mounted straight, as an inverted L or vee or sloper. It may also be bent or dog-legged to fit in available garden space.

Also the poly weave wire will not kink and is extremely strong.

Features

Rugged design
Easy setup
Optermised for AM broadcast.
Lightweight
Manufactured in United Kingdom

Specifications

End Fed Wire Antenna (configurable as)
- Random Wire
- Inverted L or V
- Sloper
Frequency: 1.2 - 30 MHz
Band: 238m upwards
Power handling 50W AM, (400W, CW or SSB)
Impedance 50 Ohms
Connector SO-239
Length 50 Meters (can be shortened, depending on application)
Non-Kink Poly Weave Wire
Made in Great Britain
Earth stud M3
UNUN Enclosure to IP66