Posts Tagged ‘Transmitter’

Build my first own fm transmitter radio station

I wrote a similar article before about Fm transmitter. That time, i was still a layman. Anyhow, boy turns to be man and so do i. I booked some manuals and started to build my own fm transmitter house with my bro`s help.

I bought some equipments needed to biuld my little fm transmitter house on the internet. First one is an antenna, you should know that the bigger size an antenna the further distance. Then is the transmitter which is the most important part in the processing. We all know this cute stuff is used to transmit a radio wave on any frequency you want. The third thing is power, a transmitter still needs a power supply, and the larger power means the further distance the signal could be transmited while also the higher price. After the transmiting part`s ready, i needed to find another sound termination like CD player or MP3 and a mirophone to transmit. On some aspects you still needed Coaxial Cable to connect your signal with the antenna. lastly a compressor/limiter was needed to keep the sound level of your transmission even and constant.

Things came to the next were so easy. Took out instructions of the fm transmitter i bought through internet and started to putting the things together. Anyway once you had some problem could not solve by yourself you might need the help from the local amateur radio club. However i got my brother for lucky.

What kind of power we need to choose is always a problem which makes us feel confused. Actually we know that all depends on the the height and quality of your antenna, the power of your transmitter, the region you are transmitting from, what kind of signals you are transmitting, the sensitivity of the listener`s radio equipment, and whether or not there are any building or structures blocking the signal. Anyway i made my chioce after considering all the factors arround my brain. What i could say was that it`s quite sensible.

Here we came to the last thing -- setting the frequency of the transmitter radio to transmit on. What i`d like to tell you was transmitting on the wrong frequency could interfere with emergency services and air traffic systems. Generally the frequencies of FM radio is transmit ranging from 88.1 to 107.9 MHz. Each FM station is separated by a 0.02 MHz frequency interval. Remember to check with your local government to determine which, if any FM frequencies you are allowed to transmit on.

Now Kimpaul can`t help to start its first using. Took my baby to the bedroom on second floor, and turned on the CD player pluged the transmitter into it and my brother hold the little fm radio setting the frequency and you konw what the most amazing things happened in my life i could not help to jump high and shouted out "awesome"!

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Single transistor 40 Meter QRP transmitter using one transistor.
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I use this TBW transmitter on 40 meters for AM (7.290) and have been opperating it for around four or five years now. The power supply is home built and located in both the old center section and under the rack the transmitter lives on. KA3EKH
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Ramsey QRP40C 40 Meter QRP Amateur Radio Transmitter Kit

• Work the world...On a watt!!! 40 meter band
• Transistor circuit, oscillator, RF amp chain, and clean keying stage!
• Pi-network output for good matching and harmonic suppression!
• Provision for two internal crystals, front panel switching!
• Electronic kit, assembly required

These nifty little CW transmitters are practical and economical take-along rigs for trips, camping, teaching or just amazing yourself with just what a watt will do! With exceptional manual of over 20 pages, the detailed step-by-step instructions guide you to a perfectly operating finished transmitter. The rigs use a standard crystal that is connected into a VCXO circuit - which means that you can tune around the crystal's frequency by up to 20 KHz - thus giving you stable crystal control while still being able to tune around! A front panel switch lets you choose between two crystals, we include one, you can add another of your choice. A built-in T-R switch allows break-in operation. Of course, these transmitters interface perfectly with our QRP Mini-rig receivers and our CMOS CW keyer! And for the real ham, there's plenty of room inside the included case for your own circuit modifications and experiments, these little rigs are often the heart of many QRP operator's stations. Modify "till-the-cows-come-home," or just use 'em as they are - these little rigs pack a lot of performance into an economical package. Runs on 12 VDC at 200 mA or the optional AC125 power supply.

Price: $ 44.95