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Recent content by biff44

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    Synchronizing two signal generators

    one of the best devices i ever played with, which was perfect for your applications, was to us an HP "Time Synthesizer". you could generate two fast pulses and dial in whatever delay you wished from the front panel. HP 5359A they are not that expensive used.
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    Blowing up coax cables

    that is not "melting thru" the cable. that is arcing. an arc forms, then all bets are off as the plasma errodes the teflon.
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    Injection locked VCO

    well, basically you can injection lock an oscillator a LOT of ways. back in the day we would use a ferrite circulator to separate the oscillator output power vs the injected input power My concern on your diagram is: what is the IMPEDANCE Zl that the gate of the FET sees looking out? As you...
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    Design RF choke

    So you want to emulate a lumped element bias line, to get the broadest bandwidth. To make a series inductor out of a microstrip line, you make it as high an impedance as possible. so practically, you do not want a line width W1 smaller than 5mils, so you choose that size. make it quarter...
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    Highpass Filter Using Optimum Distributed

    here are 0.1 db element values: or page 4 of this: https://www.ntuemc.tw/upload/file/20110419121108b8063.pdf
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    Copper attachments for pcb, For better thermal and grounding

    You can solder the back side (if it is a solid copper ground plane) to a thick copper plate. this plate will be easier to attach to a heat sink, and if it is thick enough the heat will spread laterally, giving you a lower thermal resistance. But ideally you DO use via holes. gold holes are...
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    properly using HMC8193

    IF you give the LO port 18 dbm or more of power, you should be able to drive the RF port to 13 dBm at its 1 db compression point. If you starve the LO port of power, the RF input compression point will worsen the data sheet does not say, but i probably would not drive the LO port at more than...
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    Resistor footprint in Power Divider

    i am not going to draw the entire thing, but there is no need for coplanar line in the middle where the resistors are. Model that as coupled microstrip lines, and get rid of any ground plane underneath the resistors, like this, and it will work fine
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    Lumped to distributed element conversion

    there is no "exact method". You pick a narrow band of frequencies you are interested (for instance near the cuttoff frequency of a filter), and pick a distributed element to simulate by a distributed one. so as an example, you have a series L, shunt C, lowpass filter with a cuttoff frequency...
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    Novice description of RF vs Electrical waves

    is the question if you have something that pulses at a 33 mhz rate (i.e. ON, then OFF for the total period of 1/33 MHz time), does it look like a 33 mhz rf signal? sure. but it also has 66 MHz, and 99 MHz content, the later of which will be very high amplitude level. this makes it kind of...
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    Impedance matching for LNA having infinite input impedance

    IF it is low frequency, AND it has a very high input impedance so that it is truly a voltage controlled device, YES the voltage at an effective open circuit is doubled. but your gain flatness will be very poor, as you have deliberately created standing waves at the input of your amplifier...
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    logarithmic amplifier for HF

    discrete is def not the way to go. semiconductor chip ones, with carefully balanced gains rule the world. how about a log detector, where you have a detector diode and shape its output to be logarithmic. and you can add a 2nd detector diode with a fixed gain amp in front of it, to extend...
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    Bandwidth

    Antennas, generally speaking, are formed of line lengths. If they are made of transmission lines, they act as transmissions lines do and have limited bandwidth (see the whole topic on Richard's transformations). If instead you make the elements out of quasi lumped elements, they will act more...
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    What's the name of these 'trapezoidal metal' strip??

    ^exactly. they are ling length adjusters. the signal splits into two paths, and for some reason you might need to phase balance the two outputs. is it an I/Q mixer, for instance, and you adjust the line lengths to achieve unwanted sideband supression?
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    Gain in Cascaded Gain Blocks

    lots of possibilities: 2nd gain block is blown up short circuit in the 2nd gain stage Open circuit in one of the series caps in the 2nd gain stage The system of both gain stages OSCILLATING at some out of band frequency, which you do not notice, which is compressing the output stage.
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