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1 watt AM transmitter, available assembled

It's the item our visitors most search for and now it can be yours!
     6v6 Electronics, home of Vintage Components and a wide variety of radio topics, components and kits, has done it.
     6v6 Electronics now offers the "Mosquito" a ready built, ready to run one watt AM transmitter for the US market.
     Vintage Components first entered the low power radio scene with an innovative Part 15 compliant transmitter called the "Gizmo."
     While no longer available, this first unit served as a clever and robust effort, prologue to an exciting selection of innovative low power transmitters.
     The Gizmo gave way to the "Metzo" (now also discontinued) and finally the "Spitfire" a truly remarkable Part 15 compliant unit.
     We still have the Gizmo we ordered from Vintage Components back in our SCWIS days and our Gizmo works as well today as it did 16 years ago - a testament to the quality you can count on from 6v6 Electronics.
    The "Mosquito" offers an amazing array of features and you can read about those on the Mosquito US and Mosquito EU product pages.
     Even better, your faithful editor was able to get an email interview with 6v6 Electronics for an in depth look at some of the insider secrets behind this exciting product:

Q. Why did you decide to offer the Mosquito?

The Mosquito 1 Watt AM Transmitter was designed to cater to
  • the new 1 Watt Low Power AM standards (MW) being introduced worldwide, (for example in  Scandinavia and the Netherlands).
  • and also for use on 160m SW (Top Band) for radio amateurs (HAMS)
Q. Do you recommend any specific antenna configuration? E.G., air coil vs iron core matching coil, use a 365pf variable capacitor, base loaded or center loaded, is a ground rod recommended?

We have no specific recommendations for type of antenna

  • the rules in Europe & Scandinavia are different (as are the rules for MW & SW)
  • antenna choice is largely governed by individual users circumstances (live in flat, house with garden, open land etc etc)
  • as an example some Scandinavian countries have no limit to antenna size so theoretically you could use a half wave 110 meter long wire with matching balun (space permitting)
  • far more likely is base loaded verticals with suitable loading coils
We do however require the antenna to
  • present a 50 Ohm load and ideally be tuned/matched to the frequency of choice
  • a suitable ground plan or counterpoise (depends on antenna selection)
  • suggest the transmitter connected to Earth

Q. Was there a technical reason you chose 1000 - 1710 kHZ or is that the typical band range for an EU MW XMTR?

The reasons are
  • with short antenna the higher the MW operation frequency the more efficient the antenna will be
  • to minimize wasted power in the transmitter operate in class E mode where possible
  • and don't forget the unit will also run SW Top band 160M as well
  • in  fact the unit will cover 450khz to 1000khz working in class C!
Q. How does the Mosquito differ from the Spitfire? e.g., the Spitfire includes an antenna matching section but there's no mention of that for the Mosquito, the Mosquito doesn't seem to have the same audio management functions, etc.

  • The Spitfire is designed to "Run out the box" using 3 Meter antenna... Requires virtually no technical Knowledge...
  • With the Mosquito you will need the some technical skills to fabricate a suitable antenna
  • Both transmitters have the same audio features.
Q. Anything else you'd like to include?
  • The Mosquito transmitter is ready built and ready to run..
  • The Mosquito employs a crystal controlled frequency synthesizer for accurate tuning and drift free frequency stability.
  • The Mosquito employs "Class E & C" output technology and provides the full 1 Watt carrier, 
  • The modulator stages includes both over current and thermal shutdown.
  • The modulation stage can provide 0 to 110% modulation.
  • 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,US,UK & Australia.
  • 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 (EU,US,UK & Australia.)
  • Audio Cables included.
  • Stereo 3.5mm jack to twin RCA (Phono)
    The "Mosquito," and most of the other exciting products at 6v6 Electronics 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 & Finland
  • Worldwide subject to any country specific regulations
     Wow! You won't want to swat this Mosquito. If you'd like to join the experimenters who enjoy the relatively lax enforcement in the AM band and try your hand a low power radio the easy way, check out the "Mosquito" at 6v6 Electronics

3 comments:

Unknown said...

Just got the mosquito as a gift..is there any other way to make a simpler antenna as the ones mentioned?..I am very much a.beginner at this hobby..would a simple piece of wire work just like their regular
Am transmitter?do not want to break this transmitter..thanks for your time! manichsp@att.net

Ralph McGarry said...

Did you ever get a reply to this question? Did you fashion an antenna for your rig? How did you get on?

Low Power Radio Guy said...

Thank you very much for your comments. The challenge with a simple short wire antenna is that this kind of antenna can damage the transmitter. This is because the transmitter works best with a 50 Ohm load on the antenna terminal. A simple wire antenna would need to be about 160 feet long to provide a 50 Ohm load at 1500 Khz.

That's why we use loading coils or dummy loads.

A dummy load is just a 50 ohm load with an antenna connector. You be able to pick up our transmitter if you are near by but there won't be any significant range. you can find dummy loads on Amazon here: https://amzn.to/2y0Y81b

If you grabbed a piece of plastic pipe or other non-conductive coil form like a big glass jar that was around 3" in diameter and 4" long and wrapped about 120 turns of wire, or about 100 linear feet of any wire, around that coil form you'd be close to what you need in the high end (1400 KHz - 1700 Khz). Connect one end of the coil to the transmitter and the other to a 10 to 20 foot wire antenna.

It's not that hard and if your transmitter has a good ground connection you'll get great range.