Very cheap Ebay FM spy microphone equipment listening device tested and reviewed for range. Really surprised by how well these small listening spy equipment devices work.
Ebay link.
Frequency 85-115MHz FM transmitter module wireless microphone surveillance Black
Description:
Operating Voltage: DC 2V- 9V
Current: 9mA (3V voltage ）
Reference distance: open ground 100 meters, 10-30 meters indoor environmental obstacles (3v voltage test, increasing the voltage from the greatly increased)
Operating frequency: 85MHZ — 115MHZ (usually between 99-101 boot default frequency)
Receive way: as long as the 88-108MHz FM radio can receive, with FM feature phones.
Frequency adjustment: adjustable capacitor
Output Impedance: 50 ohms
Size:2 cm * 1cm （L*W）
Package Included:
1PC*FM transmitter module wireless microphone Surveillance frequency 88-108MHz
Gordon Hudson
You could build it into a USB charger.
Fred in the Shed
Yes 5 volts would work.
mr cool
Interesting video to use as spy device use around 110 mhz off fm band and receive on cheap scanner build into something maybe mains power with short covert range bigger the item longer the aerial with in reason no need for batts
Mark
I like the way you pause for a second to enjoy the D&B on the radio, old skool raver by any chance? 🙂
Fred in the Shed
LOL no idea what station it was. Could have been a pirate.
Phil619
Well fred what a great spy kit me and my next door neighbour talk to each other with our listing device p.s I’ve just ordered a camera pen
radiosification
I think the FM broadcast band doesn’t start until 88 MHz, that’s why you couldn’t hear any other stations around there
Vic Green
87.5 here untill 108 mhz
Ringway Manchester
Very interesting mate, ordered a load!
Fred in the Shed
Ive bought another design to play with. 🙂
Nathan W
There’s no filtering on these things. I tried one, and it’s just pumping out harmonics all over the place.
digitalmediafan
That’s what you get for dodgy illegal stuff from China 😉
Edward Fletcher
@digitalmediafan It’s not illegal. lol
Steve Jones
Brings back memories of me and my mate’s when we where about 11 building a Hartley Oscillator and Transmitting am with it, we also found we could do Morse code on it and that increased the range to about 10 Times…Great fun using bits from old broken Transistor radio’s.
Fred in the Shed
Sounds like you had some fun Steve
Ian Butler
In the US, these are legal with 100mw or less power and 1 meter or less antenna. They are very popular in AM for people to use their restored antique radios to play old music or drama.
Fred in the Shed
That makes sense on the AM radios. Cheers
Jason Myers
why would it be illegal other wise? i dont know the laws?
digitalmediafan
Hmm nice one seems the range is comparable with those low power legal FM transmitter devices
Fred in the Shed
Yes i recon about the same but smaller footprint. Ive got another to try when i get the time.
Dr. Watts
UK 🇬🇧 broadcast frequencies are 87.5 – 108MHz my friend.
Japan if I remember correctly, is 73 – 92MHz 🤔
Too many years developing prototype car radio. It’s frazzled my brain 😂
TesterMonkey
Can you do one of them bluetooth ones?
Jason Myers
need one for longer distance like 1 to 3 miles. How?
Fred in the Shed
These cheap transmitters have not got the power. I guess you could try and mod a powerful PMR 446 radio like the Beofeng UV5R. That would give you the range.
R0sIN Fa1rFi3Ld
The tecsun tried to Feel Collins at one point 😛🤪 Nice review vid👍👍👍
jp
What a nice young fella me lad you are. Bought 2 of these and 2 cheap transistor radios. Idea is that I’m fed up with pushing buttons on a walkie talkie and hopefully the old dragon and I can argue about who’s going to have a headache tonight whilst I mess about outside and she’s cutting her toenails with my new wire cutters. Do you think 9V would be better and what length aerial would be best ? Just finished a quad bench power supply 2 x 9A 0V – 38V linear (can be paired to give 18 A), 1 X LT1083’s 8A?(4 off in parallel) linear and a big buck. Weighs a ton. Why? no idea but it’s fun init.
Fred in the Shed
The transmitter should run on a 9 volt battery without issue. I found (on my other bug video) that a 1-1.5 meter antenna wire gave me about 200 feet range.
ibanez2010
I have a different one, from Amazon. Mine was also tuned for ~96Mhz out of the box. Using them for a spy workshop.
Cory
can you post a link please
ConstructiveCriticism
how do u adjust the transmitter broadcasting frequency?
Fred in the Shed
If you look on the board there is the tiny white screw pot next to the microphone.
Andy McNulty
How long does it last on a 9v battery non stop?
Fred in the Shed
I did not run my battery totally down but i did 90 mins testing and it was still going.
Gianluca Croce
Hi Fred! Thank you for this interesting video report. Could you please advise the specs for a proper antenna (kind of wire, its length, etc…) to be coupled to this device? Many thanks in advance. Have a great day.
Fred in the Shed
Hi it will depend what freq you tune the transmitter. There proper antenna length calculators on line. As a rough guide it will need to be as long as a standard FM radio
Gianluca Croce
Thanks!
Gary McKinnon
lol, you could have taken the radio in the car! Liked and subbed 🙂