Posts by iw5bsf

thank you for your patience, now I understand even looking at the picture window of 30 mm * 2 mm

73 de iw5bsf Roberto

how much the two cables of the two lines must be in total

Do I need to cut the ut141 cable as a useful measure of both cables? considering 30 mm

73 de iRoberto

thank

thanks but they are both 30 mm long ?

73 Roberto

I'm sorry I meant the data for the construction of the directional coupler in mm if you can pass them to me

thqank

73 Roberto

directional coupler

Hello George which measures have two ut141l directional coupler cables

Roberto

ok thanks for the advice now i try anyway i see it's working ,

I was reading your previous post, which is not 50 termination ad8302

https://forums.qrz.com/index.p…uilders-out-there.560786/

https://ez.analog.com/rf/f/q-a…-and-output-of-the-ad8302

73 de iw5bsf Roberto

hello George thanks, I added the corrections to the diagram I'm simulating that the ad8302 trimmers work by varying the voltage downwards the display also marks the example value -8.2 also the phase. 0

73 Roberto

Maybe I explained myself wrongly, how should I connect it ?

ATTENTION: the resistance divider on the 18650 will discharge the battery if it is not cut by the main switch

I correct myself !

if r if the divider remains attached, it will discharge the battery if it is not deactivated when the power is turned off

Ps

check me if the schematuc with your corrections is ok

update I simulated ad8302 as you told me giving 1.8v the display shows GAIN 25.5 and Phase 20, but SWR does not indicate anything

I have not yet 1850, I used the sorry 5v laboratory power supply sorry let's see if I understand that it has to be open?

TEST DISPLAY LCD with 5v power supply on

Hello George , a question pin 21 REF atmega8 seems to me to put a capacity towards gnd?

Hello George arrived yesterday ATMEGA8 I managed to load the file.hex the program tells me ok I think tomorrow I assemble the pcb circuit

73 Roberto

Thank

Yes, I have to complete it, I didn't realize it, thanks for letting me know. , but usually feeds pins 15 and 16 by inserting the earth through a resistor and right?

hello George I like to design pcb on FR4 that's what came out

tkank ok

Roberto

Hi George, in the ATMEGA8 scheme the pins 7 + 5v and 8 gnd also the pins 22 should be put gnd? so all vcc in the scheme all 5v well I see that in a picture you put a button if I'm not mistaken

73 Roberto

Hello George if it can help you with ad8302 I you doc w1ghz web page

A Homebrew Ratiometer for Antenna Measurement, or a Handheld Network Analyzer

Roberto

Hi ok scheme that you sent me as a correct value for R2 and R3 resistors? , meanwhile I mount the circuit

73 Roberto