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Sain Sonic 0.1-0.5 watt Long Range TX on Amazon

M

Mid West Clubber

Guest
I got me one of these for 55.00 bucks,,,, The stereo output and signal is good at the 0.1 watt output,,, Getting out about 1/4 mile before static takes over,,,, the 0.5 watt setting gets out one mile with a clear signal,,, and up to 2 miles with static,,, But I dont wanna get in trouble so im keeping it on the 0.1 setting... 1/10 of a watt, with built in Antenna for my new OLDIES STATION, which is within FCC regulations..... :)
 
Mid West Clubber said:
But I dont wanna get in trouble so im keeping it on the 0.1 setting... 1/10 of a watt, with built in Antenna for my new OLDIES STATION, which is within FCC regulations..... :)
Click to expand...

.1 watts (100 milliwatts) is the specification for Part 15 regulation specific for AM, (Part 15.219). The applicable rule for FM is 15.239, which is a field strength measurement and NOT a transmitter power specification.

Part 15.239 specifies a field strength of 250µV/m measured as a distance of 3 meters from the antenna. If, on a good radio, your signal is getting out more than 200 - 250 feet then you're more than likely exceeding the limit specified of the regulations.

Just because it's sold on ebay or Amazon doesn't make it legal. If the transmitter doesn't have an FCC certification ID on the unit it's pretty much a sure bet you're buying something not legal.
 
WIth the lowest Power setting,, Its dumbed down to 200 feet, And thats on a car radio,,, Its tempting to crank up the RF,,, But Im not going to.
 
You know its a quality unit with this description:


The product crust is made of high-quality aluminum, which also is the heating panel of power amplifier RD06HVF1, with blue backlight LCD to display five digits of frequency.
The motherboard is applied with chip BH1415F, which is the new-generation integrated NC FM stereo radio chip by ROHM, built-in PLL frequency, audio pre-emphasis, limiter and low pass filter circuit. Make sound more sweet.
The control board is designed with high performance MCU STC series, its performance is better than AT89C2051.
With microphone and audio input of the amplifier, adjustable input level. Transmitting power can switch between 1W and 7W. (How to switch? Press and hold the power switch button then plug in the power, when the LCD display L or H, then release the power button. By the buttons + and - to switch the transmitter power.)
Good shielding, compact structure, small size, generous appearance.
 
@nocomradio: That's about as bad as some of the translated printer service manuals I had to use back in the 1980's! I guess by the description that old adage is true, if you can't dazzle them with brilliance ...
 
Power is only switchable for 100 milowatts to 500 milowatts,,, If it was 7 watts it would go much farther than the 200 feet I can squeeze from it,,, Its using th ebuilt in rubber whip,, about 1 meter Haat
 
Mid West Clubber said:
Power is only switchable for 100 milowatts to 500 milowatts,,, If it was 7 watts it would go much farther than the 200 feet I can squeeze from it,,, Its using th ebuilt in rubber whip,, about 1 meter Haat
Click to expand...

Just to note that the maximum field intensity that may be radiated by an unlicensed transmit system compliant with FCC §15.239 is 250 µV/m in any direction 3 meters away from the transmit antenna.

The power needed to be radiated by a matched 1/2-wave dipole to produce that maximum field is about 11.43 nW (0.000 000 011 43... watts), or MUCH MUCH less even than the 100 mW setting of your transmitter.

As a "heads up," the FCC has issued citations to unlicensed operators where it can be shown that their radiated fields could be produced by a transmitter with 25 milliwatts of output power and less.
 
Bill DeFelice said:
@nocomradio: That's about as bad as some of the translated printer service manuals I had to use back in the 1980's! I guess by the description that old adage is true, if you can't dazzle them with brilliance ...
Click to expand...

So true!

I deal with a lot of very early Japanese manuals that have been translated into English and they are just downright mystifying at times. ;D
 
The CZH-05B model on ebay is a very similar transmitter, I've seen one of my friends with one.
Simulcasting some iHeartRadio stations it sounded like the main station with near perfect quality.

0.5 watts gets out static free about 1/2 mile clear (up to 1 mile with static) when placed near a window,
otherwise it's closer to 1/4 mile clear signal. The rubber duck antenna for it is about 8 inches tall.
0.1 watts with a different antenna, a 1.5 inch BNC scanner antenna barely made it about 100 feet.

It's such a rural area and no one around here would likely listen to it,
nevermind complain of interference...I would stay away from using them in a town or city though ;)
 
And all you need is spurious emissions to cause interference to the aircraft band. If you think the FAA and the FCC will ignore that I wouldn't want to be in the shoes of the person operating THAT transmitter!
 
I checked one out. It's set at 50, not 75uS equalization. It's not designed to be used in the U.S.
 
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