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0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W) Best Price
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Brand: Fail-Safe Security
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0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W) Product reviews
0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W) Review by Brett Buck (Sunnyvale, CA USA)
I wanted a somewhat stronger transmitter than the little car units, although those work pretty well if you have an antenna. This transmitter is a different breed of cat - much stronger, and small for what it does.
I hooked it up and got it working right away. But it's FAR too powerful for my application. I tuned it to an unused frequency and it worked there, but on every radio I own (all VERY good) there was severe interference with many other frequencies, evenly spaced across the dial. I turned the power down, and it was slightly better, but still produced completely unacceptable interferences all up and down the dial. It's also extremely sensitive to the input levels - too much and it grossly overloads the input. It has an adjustment for that but it appears to be far too sensitive because even my iPod has to be at half-volume, with the sensitivity on the transmitter at half, too or it has severe distortion.
For my application, it seemed to need some attenuation, so I asked the "manufacturer" how to proceed. That's where the extreme irritation began. I never got anything like a straight answer or any sense that they were responsible for the unit, or were willing to take it back if we couldn't come up with a solution. They suggested reducing the antenna, but when I asked if that would void the warranty, they said *yes*. I asked for other solutions to reduce the power and never got a straight answer. They also sent me a letter from some ham radio guy explaining something entirely unrelated to the problem. I went back and forth and never got a decent answer. And suggested that I needed better receivers, which is ludicrous - it doesn't work with a Zenth Royal 3000 or 7000, a Telefunken Opus 7, a TEAC Stereo tuner, a Dynaco FM-3, A Magnum Dynalab stereo tuner, or the very-well-respected Sony HD Receiver. So, in short, no quality receiver made in the last 50 years.
On 500 mW, and set up in my living room in a stucco-wall apartment, I was able to get the signal, and significant interference on many frequencies, out to about HALF A MILE. Using the ACG meter in one of my radios, I got more signal strength than any available FM station out to around 1 mile, at which point it was acceptable from an interference standpoint. This appears to be grossly more power than the allowed by the FCC low-power FM transmitter requirements. Reducing the power level to 100mW reduced the range but anywhere near my apartment complex I got a huge amount of signal strength and interference.
The problem I had was clearly that the power was so high, even on the lower setting, that the harmonics of the output still generated more signal strength than the average station. I ended up experimenting and with significant shielding of the antenna, I got it attenuated sufficiently and it worked fine. I know that it changed the antenna impedance and may burn up the output at some point, but that's what is needed to make it work.
As near as I can tell, the suppliers (F-S Electronics) take no responsibility for the product and don't know much about it. I also strongly suspect the transmitter is not FCC type-approved and probably generates grossly illegal signal strength and interference as supplied. There is nothing like an FCC Type-approval sticker on it anywhere. There are some vague statements in the instructions about maintaining legal signal levels but absolutely no indication on how to alter the output to achieve that or determine if you are compliant.
My solution is going to be to alter the antenna, ad-hoc, by shunting some of the power through a resistor, and run it. That may be adequate loading but it may also blow the output stage, at which point I appear to be out-of-luck.
0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W) Review by Mr. Pete
The product performs exactly as advertised.
Shipment was very quick!
A minor problem with an accessory was quickly addressed by customer service who quickly responded to my email and shipped a replacement part the next day!
Great job folks!
0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W) Review by YellowAndGreenBoardBuddy
I wanted to set up "whole home" audio around my house and yard. I didn't want some "toy" transmitter that goes 30 feet - I need a good signal out to a couple hundred feet. I ordered the Fail-Safe recently as it was on sale for $99.95. Though it was supposedly back-ordered a month away, I was pleasantly surprised when it arrived in about a week. I opened the package and was on-air within 5 minutes. It does everything it claims to do, and I am quite pleased.
The unit is quite compact - not much bigger than a bar of bath soap. The Xmtr looks a lot like the HLLY units you can find online, and like the HLLY, this one is Chinese-made, despite Fail-Safe's claims of "American made." In truth, they are "American sold." These are generic transmitters mass-produced overseas sold by numerous companies around the globe. That being said, I still chose the Fail-Safe over the lower-cost HLLY and others due to the good reviews about Fail-Safe's tech support. Nice to know I can call somebody in Indiana if I have a question or concern. Better to pay $100 and have domestic support than to pay $60 and give your credit card info to some guy in Guangzhou.
I set up the Xmtr in my home, at ground floor level, perhaps 6' height above average terrain (HAAT). I connected the antenna, plugged in the power supply, turned it on, set freq to an empty channel and connected my mp3 player. I set the power to low (100mW) and turned on radios around the house. The signal was rock-solid with very good fidelity. There is a small amount of noise in the signal, likely due to the switch-mode power supply. The noise is only apparent between songs, or when the music is very soft. Most of my music is very dynamic, so it won't be an issue.
I got in the car and drove around the neighborhood. I received a solid signal out to about 1/4 mile as the crow flies. I live in a suburban residential area with flat terrain. Beyond 1/4 mile the signal started to drop out, though I could still hear music fading in and out at a distance of 0.6 miles (according to my GPS). I also tested it with a portable pocket radio, but that lost the signal beyond 0.1 miles. Pretty good signal given that all I want is coverage for around the house and yard. I don't want to entertain the whole neighborhood. I moved the unit upstairs, about 15' HAAT, and the signal range was about the same.
I switched to high power (500mW) and there was a dramatic increase in range. I drove around and the signal stayed rock-solid to just over a mile with weaker coverage to about 1.5 miles. I switched the Tx back to 100mW, as that is more than enough power.
Keep in mind that this transmitter is NOT FCC Part 15 compliant. There is no Part 15 label on it, nor is there any transmitter certification. You're on your own here, and Fail-Safe makes that clear in their instruction sheet. In the U.S., the maximum for legal, unlicensed FM transmissions is 250uV/m, measured at 3 meters. Contrary to popular belief, the FCC does not state this limit in terms of power. Transmitter power is misleading - due to efficiencies, transmission line losses. antenna gain, antenna height, terrain, obstacles, etc., your mileage may vary. It's signal strength that matters to the FCC. I haven't measured the signal strength of the Fail-Safe unit, but I would not be surprised if it was several times that legal limit - even at the low power setting. So unless you live way out in the boonies, you might want to keep it at the 100mW setting if you want to avoid getting a NOUO letter from the FCC.
Whatever you do, don't ever transmit on an occupied channel. Radio stations take a dim view of people interfering with their signals. All it takes is one complaint and some FCC agent will be cruising your neighborhood in a van to triangulate your signal. And if you live close to an airport, you may want to think twice about operating one of these. The unit puts out some spurious harmonics and it may interfere with aircraft communications just above the FM band.
One minor gripe: the swivel function of the rubber duck antenna is a bit loose, and the antenna tends to droop over. A piece of electrical tape wound around the swivel fitting keeps the antenna upright.
In all, I am happy with the Fail-Safe and would recommend it to others - with some caveats.
UPDATE: I decided that running even 100mW is too risky, given the onerous FCC penalties that can result from using this transmitter, and the ease at which they can find you. I bought a 50-ohm RF attenuator that connects between the transmitter's BNC jack and the ducky antenna. The attenuation is 10dB, which reduces the output power by a factor of 10.
[...]
My coverage at the low-power setting with the attenuator is about 1 - 2 blocks on a good car radio, and a couple hundred feet with a walkman-type portable radio. Just the power I need (10mW) and still a better signal than what you get from the toy transmitters.
More Reviews...
0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W):: Description
FS Electronics is proud to bring the 0.5 W FM Transmitter EXCLUSIVELY to Amazon. The features and ability of the FS Electronics FM Transmitters are unmatched. Unlike our "competitors" who suggest their FM transmitters to broadcast throughout your house, this one WILL--backed by F-S Electronics' Money Back Guarantee! Includes: 0.5 W Transmitter 12 V Power Supply/Power Cable Rubber Duckie/Whip Antenna
0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W):: Technical Details
- Guaranteed satisfaction!!!
- Adjust frequencies with the touch of a button from 88.0 MHz to 108.0 MHz
- Easy to Read LED Display
- Robust and durable design
- Adjustable volume controls for both Audio & MIC Inputs
- Brand: Fail-Safe Security
- Product Type: Electronics
0.5 W Fail-Safe Long Range FM Transmitter - CZH-05B - WITH NEW HI (0.5W) LO (0.1W):Limited time only!
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