fm transmitter scematic required

[D0T-C0M]

I researched the Ramsey model but they are about $60 more for a kit and about $100+ assembled. Second is the fact that EDM is also microprocessor controlled and has digital LED readout. If I can quote from their site

This is the only Compact, Multi-Channel, Digital-Display, Fully-Synthesized, Microprocessor-Controlled, Stereo FM Transmitter kit that we know of for under $100 (including S/H)!!

I found all the feedback I read on all the independant website was all positive. I was hard pressed to find anything negative about them. I also liked that EDM posted alot of their graphs and tests online. As a customer I felt re-assured that they were very open and honest by posting their specs online. This tell me that they have nothing to hide and not afraid to post their results publically.

Full Band operation: (87.7 - 107.9MHz) in 0.2MHz increments, on LED display
Frequency Stability: < 0.0005% of set frequency
Frequency Accuracy: < 0.001% error from set frequency
10mW (+10dBm) into a 50 Ohm load
100mW (+20dBm) unit also available
RF output is reduced 20dB while tuning with PLL un-locked
VSWR: Withstand 20:1 without damage (both models)
Low phase-noise
-90dBc/Hz @ 10kHz
-94dBc/Hz @ 20kHz
-104dBc/Hz @ 100kHz
Low spurious output: < - 50dBc
Low Residual FM: < 25Hz rms (Measured in a 300-3kHz Bandwidth)
Incidental AM: < 0.2%
Frequency Response: 20Hz - 15kHz
Level: Line level input via RCA type sockets (level adjustment on module)
Max Audio I/P sensitivity: < 100mVp-p (integrated limiter)
Distortion (THD): 0.2% with 1kHz tone at 75kHz deviation level (mainly 2nd, 4th)
Signal to Noise Ratio (SNR): > 60dB
Stereo Separation: Typical about 40dB

 

[AN920]

I must agree with you that I have never seen any worthwhile specifications published by Ramsey on their transmitters! Maybe because the final outcome relies on the builder builing it correct. But then they can do it for the export- fully assembled models.