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
yes ok i have a spectrum analyzer hp8565a, qello with ad8302 it is useful to take it to the garden to test the antenna this point should I create the right directional coupler that I see on your site?
ok George yes i have a semi-rigid cable i can also build it, the scheme i sent you and ok?
thank George enclose the reference drawing schematic
with corrections, check if they are OK
for the directional coupler I would have a narda if it can go well or what you advise me
Roberto
I ordered the modules but it will take a month
hello George let's see if I understand vbatt res div on ADC2
atmel pin 25 : I enclose the reference drawing
Even 10 Kom lift the reset pin. I have to press a button
I use a PCB from 2.5-4.2 V to 5 V from eBay to power the system through a 18650 and a PCB to protect the charger also from eBay send me ebay link
OK George thank file I look at the schematic then I'll let you know
73 de Roberto
thank you George for me yes atmega8 easier arduino never used it yet
good morning thanks, in the meantime I ordered ad8302 on eBay how can I get the software?
73 Roberto
