transmit and receive tuning question
transmit and receive tuning question
(OP)
hi, i am building a transmitter and receiver using solenoids. there are two frequencies i am using, 2 mhz and 400 khz. the receiver has a photo-mosfet to select between two tuning circuits.
the receiver is parallel tuned to minimize energy loss in the tank circuit, which is ac coupled via passive high pass filter than to impedance buffer.
the transmitter is series tuned to maximaze current through put into the transmit solenoid. this way the series resistance should have no effect other than current limiting and controlling power output.
the question is whether this is a typical way to get maximum transmit power and maximum receive power? is there a better way to transmit and receive using solenoids as antennas?
the receiver is parallel tuned to minimize energy loss in the tank circuit, which is ac coupled via passive high pass filter than to impedance buffer.
the transmitter is series tuned to maximaze current through put into the transmit solenoid. this way the series resistance should have no effect other than current limiting and controlling power output.
the question is whether this is a typical way to get maximum transmit power and maximum receive power? is there a better way to transmit and receive using solenoids as antennas?





RE: transmit and receive tuning question
Dan - Owner

http://www.Hi-TecDesigns.com
RE: transmit and receive tuning question
RE: transmit and receive tuning question
TTFN
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RE: transmit and receive tuning question
RE: transmit and receive tuning question
Posting a schematic of your circuit will be helpful.
Z
RE: transmit and receive tuning question
please have a look at the receiver side of things. thanks.
RE: transmit and receive tuning question
You measure power in volts? If this is not schoolwork, you need to explain your project.
At this point in history, there's virtually no commercially practical reason to not use Bluetooth or Zigbee, both of which can span 3 ft, or even 30ft, distances with trivial ease, with substantially lower power, and do not require any tuning whatsoever, in additional to being already configured to send and receive a plethora of messages and protocols. You can buy USB Bluetooth transceivers for less than 1/20th the amount of engineering NRE consumed in this thread.
TTFN
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RE: transmit and receive tuning question
RE: transmit and receive tuning question
thanks alot.
RE: transmit and receive tuning question
You can pony up some details and get useful advice, or you can toss a breadcrumb over the wall once in a while and get a breadcrumb back... your call.
Dan - Owner

http://www.Hi-TecDesigns.com
RE: transmit and receive tuning question
As an antenna engineer, most antennas are electrically large. For RFiD's they're so small you can communicate better with a transformer, such as your requirment, and maybe similar to an AM Radio antenna.
Here's a link that might help on RFiD antenna systems; http://
They use voltage primarily when discussing power transfer and they use coils for antennas. Hope you get it to work (google other RFiD info) and I hope this forum is nicer to the next rookie we encounter. After all, it takes the same amount of time to type kind words.
RE: transmit and receive tuning question