Frequency of receivers to receive each others transmission.

AI Thread Summary
The discussion revolves around calculating the frequency at which receivers should be tuned to receive transmissions from two transmitters operating at 17.5 MHz. The original poster is confused about the problem statement and believes the answer should be 54.0 MHz, despite both transmitters operating at the same frequency. Participants suggest that the receivers should also be tuned to 17.5 MHz unless there is a specific heterodyning aspect not mentioned. Clarification is needed on the problem's requirements for a proper solution. Understanding the basic principles of tuning receivers to match transmitter frequencies is essential for resolving the confusion.
mmcd051
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Homework Statement



I need to calculate the frequency which the receivers should be tuned to too receive one another frequency. Both are transmitting at a frequency of 17.5 MHz. I know the answer should be 54.0MHz.

Homework Equations



Unsure

The Attempt at a Solution



Unsure of how to find the common frequency, I know your suppose to show how you attempted the question but am unsure how to even start. If someone could offer me a formula to start. I'm sure its an easy question, I am a bit stumped tho. Thanks
 
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When I set up a circuit, I tune the receiver to the frequency the transmitter is tuned to (modulo possible offsets due to emission type). Perhaps there is some confusion in the statement of the problem.
 
mmcd051 said:

Homework Statement



I need to calculate the frequency which the receivers should be tuned to too receive one another frequency. Both are transmitting at a frequency of 17.5 MHz. I know the answer should be 54.0MHz.

Homework Equations



Unsure

The Attempt at a Solution



Unsure of how to find the common frequency, I know your suppose to show how you attempted the question but am unsure how to even start. If someone could offer me a formula to start. I'm sure its an easy question, I am a bit stumped tho. Thanks

Welcome to the PF. I agree with tms about not understanding your problem statement. If you have two transmitters at 17.5MHz, why would the receiver not be tuned to 17.5MHz as well? Is there some heterodyning part to the question perhaps?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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