[gating rf frequencies]

hi,

i am fairly new to all this so please excuse my lack of tecnical knowledge....

I am trying to design a device to gate the output of a function generator. The generator output is sine at 2vpp ac and needs to be varied between 3 and 5Mhz.

I have designed the 555 timer at the values: 1330hz at 25% duty cycle and i need to use this timing to gate the ac signal from the function generator (25% on 75% off).

i have been looking at using cmos chips to do this but these only gate dc signals right?

can you guys offer me some options/help in gating rf ac frequencies.

incedently the gated signal with be amplified to 15w using an rf amp (not yet designed) if this matters at all

thanks

[ultrasonic transducer 1 - 3mhz source]

hi,

i am building a project and i need to source a ultrasonic transducer that can output frequencies over a bandwitdth of 1 to 3mhz minimum without significant frequency attenuation.

The only thing i can find online is research papers to Lead Zirconate Titanate Thick-Film Ultrasonic Transducers which can output a fairly flat range of 1 to 20 MHz Frequency Bands but i can not find any company that manufactures these. Can anyone help me to source a component that would output a relatively flat frequency response over 1 - 3mhz range?

im stuck,

thanks,