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6 Threads found on 137 Mhz
QHA is designed for 137 mhz frequency in cst.simulation result shown the s11 paremeter at 480mhz.but the radiation pattern comes good at to get return loss at 137mhz give me suggestions on how to feed an qha antenna?reply me my design feed port is defined at the (...)
the standard/most common antenna for that band is a sleeve balun dipole. Thats assuming you are using it as a base antenna and not on an aircraft. for 20W power feed you are not going to be able to skimp in size etc as you would end up wasting the power put into the antenna by poor efficiency. you will see these on airdromes far and wide across
i'm now still design LNA for weather satellite reception (137.5 mhz). some friends, suggest me to use multisim...but i cant simulate it.. i have been review many design about this LNA (maybe ten, i found in web), but i'm still confuse how to simulate it.. i have been build the model in Multisim, but when i simulate it i cant get good data
hi Guys... im will design LNA for weather satellite (137 mhz)..if i googling in the web it many design of this LNA...and mostly is only single stage and common-source configuration... why it doesnt design by differential or cascode.... is it any advantages or disadvantages of both model...? i have been read in wikipedia that cascode i
if any one have good quality recever for that can receve arround 137 mhz frequency please put here or email two .if it tested one its going to make weather sat picture recever
Hello, I´m trying to modify a Philips SAA7215HS with an SDI (Serial Digital Interface) output. Pins 128, 131-137 are data lines and the pin 126 is the 27 mhz clock to sync the signal. I have noise in the sync line and need to "clean it". I have try a 100ohm resistor in sync line and a 27-47cp Cap. from ground to sync but doesn´t work. Any