Frequency, RF Power, AGC, Mono/Strereo and other parameters are set using two buttons and LCD.
. Filtered MPX. Filtered audio.Filtered RF.Continues tuning across entire FM band.
4 pre-set frequencies - push right button to activate next preset
Unlocked PLL RF shut-down.

Seven element Low Pass Filter is integrated , transmitter has very clean output , there are no harmonics !

DC coax power plug, 2.1mm I.D., 5.5mm O.D., center positive. No case(box) available.

How to use FM Transmitter v.8

to change frequency push left button, push again to move blinking cursor to digit you want to change. Push right button to set value.

to store new settings move blinking cursor to menu number (lower right corner) then push right button.

Menu #0 - set frequency #0 and AGC:

"Lvl" is Level, each step is about 10%.

"Rcv" is Recovery Time, set 0 for no recovery - this way high input will be attenuated but will never recover

Recovery 1 to 9 set time where shortest recovery is 1 - gain will increase about 10% every 3 seconds till average signal will equal "Level" , set 2 = (3s*2)*(3s*2) 36seconds, setting 9 = (3s*9)*(3s*9) - it may take half an hour for complete recover.

Menu #1 - set frequency #1 and Audio Low Pass Filter:

standard setting is 15kHz but you may change it to anything from 1kHz to 29kHz

Menu #2 set frequency #2 and set 19kHz pilot level, each step is about 10% , don't try to change pilot level unless you have proper test equipment.

Menu #3 set frequency #3 and RF Power output. Built-in RF voltage detector used to calculate output power U*U/50.
RF power reading is meaningless if bad or no load connected, use 50 or75 ohm dummy load to set RF power

Special codes entered from any menu:

001.11 MHz - to (un)hide power-on screen "www.fmkit.com" and firmware version

003.33 MHz - to (un)lock the transmitter. Locked transmitter won't accept any new settings till you enter 333 again.

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Update: February 15, 2005

download off air recorded MP3 file (3.3Mb)
download original file (3.3Mb)

radio receiver used for test: SONY SRF-M37V

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This unit is offered and intended for educational or experimental purposes only. Seller is in no way liable for any misuse, unlicensed or otherwise unauthorized operation. The buyer assumes ALL responsibility for legal operation of this unit, which varies worldwide from country to country. Information for your area can easily be found by searching the internet.

30 Days warranty - full refund less shipping for returned transmitter.