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Am I the only one wondering why production of RF transistors in SC-70 or SOT323 package is becomming obsolete at almost all vendors?
The only exceptions (without EOL) I can find is the BFU5*0 series from NXP.
I could come up with a "rough" approach. Make the output power twice what you need and mount a power 3dB attenuator. At least it will reduce the worst case VSWR.
Not very smart though....
Does anyone in this forum has experience with the EU standard EN 300 113?
In the latest version of the standard levels of unwanted signals have been changed from a ratio to a specific level in (dBm).
My modulation is 4QAM and I cannot comply with the adjacent channel rejection.
I am attempting to achieve IM spec. of 85dB after TIA-603. That is: 12dB SINAD +3dB reduced to 12dB again. Frequency is VHF band.
The two interferring signals must be 50KHz and 100KHz from center, but this close to the wanted signal makes the result of the measurement more like generator...
I have been an RF engineer all my life. It all started 53 years ago with soldering proficiency along with teaching Ohms law. Everything else comes after that.
Danish engineer, 70 years old.
It is widely used i simplex transceivers. A fast transition between receiver and transmitter is possible if TX VCO is in lock on RX frequency x2. Receiver does not hear its own transmitter VCO until the divider is turned on.
In general, maybe, but the measuring proceedure in this case is determined by the standard. The two unwanted signals must be adjusted to a reduction of signal/noise ratio to 14dB.
Does anyone here have comments on the following subject:
Analog UHF receiver intermodulation meassurement according to ETSI 300 086 shall be performed at 25/50 KHz and 50/100 KHz from wanted channel.
When one of the interfearing generators is only 25 KHz from wanted channel, the side band...
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