Re: ADX-S V2 build - please help!
Good morning Bernd
Thank you very much for the handholding.
I found that the high resistance (about 4 Mohm) was between the A2 pin and the nearest side of R18. I reflowed the solder through these joints, but it didn't make any difference - so I bridged them using a piece of resistor leg - that fixed it. The Ardunio now recognises the LPF board!
I resoldered the clock module to the main board, and now it seems to behave unpredictably.
I pressed the TX button while connected to a dummy load via an ATU, and saw 3.3 watts of output. However, the next time I pressed TX - the TX LED didn't light and there was no TX power.
I power cycled the board, and saw a fast-flashing TX LED.
Power-cycled again. This time, instead of the band 1 LED, the band 2 and 4 LEDs were lit.
Power-cycle again, Bands 1,2 and 3 were lit.
Power-cycle again, Band 1 lights correctly - but the switches don't do anything.
I appreciate that this is a good quality kit, and I'm a poor electronics engineer, and once again your guidance is very much appreciated.
PS: It wasn't a typo - I thought that the LPF would have AC across it, my mistake - it's about 2.5 VDC.
— Rich Atkinson
+61 425 261 410
[Edited Message Follows]
Hello Rich
Why don't you make a simple resistance measurement without
voltage. To do this, remove the Arduino LPF plugged. Then measure against ground at A2 should be ~1Kohm, then ground against 5V Arduino
should be ~ 2Kohm.
If the values are correct, the board is ok and R18 and the resistor on the LPF are correctly mounted.
If the values are ok we have to look further?
?
Rich wrote: I have about 11.2v AC between 12v and GND pins on the LPF.
Rich you have to measure in the DC range or was that a typo
?
Bernd
|
In Ontario, unbuilt kit. ?make an offer.
|
Re: ADX-S V2 build - please help!
Hello Rich
Why don't you make a simple resistance measurement without
voltage. To do this, remove the Arduino LPF plugged. Then measure against ground at A2 should be ~1Kohm, then ground against 5V Arduino
should be ~ 2Kohm.
If the values are correct, the board is ok and R18 and the resistor on the LPF are correctly mounted.
If the values are ok we have to look further?
?
Rich wrote: I have about 11.2v AC between 12v and GND pins on the LPF.
Rich you have to measure in the DC range or was that a typo
?
Bernd
|
Re: ADX-S V2 build - please help!
Hi Adam
Thanks - yes I understand that. But I can’t figure out why it isn’t 1/2 vcc. I’ve desoldered the clock module in case that was the problem, but it wasn’t.
Hi Rich,
If A2 pin is normal, it should be high impedance since it is an
input pin, so the A2 voltage should be 1/2 VCC or 2.5V.
Thanks,
Adam
在 2024/8/31 8:15, atkinsonr via
写道:
Hi Adam
?
R18 is indeed 1k, but I measure 0v at the A2 pin with the LPF
installed, and 1.6v with the LPF removed.
?
I'm not sure what to look for next.
?
Rich
|
Re: ADX-S V2 build - please help!
Hi Rich,
If A2 pin is normal, it should be high impedance since it is an
input pin, so the A2 voltage should be 1/2 VCC or 2.5V.
Thanks,
Adam
在 2024/8/31 8:15, atkinsonr via
groups.io 写道:
toggle quoted message
Show quoted text
Hi Adam
?
R18 is indeed 1k, but I measure 0v at the A2 pin with the LPF
installed, and 1.6v with the LPF removed.
?
I'm not sure what to look for next.
?
Rich
|
Re: ADX-S V2 build - please help!
Hi Adam
?
R18 is indeed 1k, but I measure 0v at the A2 pin with the LPF installed, and 1.6v with the LPF removed.
?
I'm not sure what to look for next.
?
Rich
|
Re: ADX-S V2 build - please help!
Hi Rich,
If R18 is actually 1k and it is actually connected to 5V, I
suspect your 2nd Nano has a dead A2 pin already.
Thanks,
Adam
在 2024/8/30 18:16, atkinsonr via
groups.io 写道:
toggle quoted message
Show quoted text
Thanks Bernd and Adam for your help with this.
?
The photo is helpful, thank you. I belive my LPF is correct
and have attached a photo.
?
Some measurements:
?
With the LPF off the mainboard, I measure 1kΩ across it's
12v - GND pins.
?
I desoldered R18 and tested it out of circuit, it measures
1kΩ.
?
Whilst poking around I shorted something and blew the
voltage regulator on the the Nano. Lucky I bought a second
Nano!
?
Should the A2 pin on the Nano be 2.5v with the 40 LFP
installed? I'm reading zero volts at the A2 pin.
?
I measure 1kΩ between the A2 pin and ground when the LPF
is in circuit, 4MΩ when it's not.
?
I measure 0v at the A2 pin with the LPF installed, and
1.6v with the LPF removed.
?
?
|
Re: ADX-S V2 build - please help!
Thanks Bernd and Adam for your help with this.
?
The photo is helpful, thank you. I belive my LPF is correct and have attached a photo.
?
Some measurements:
?
With the LPF off the mainboard, I measure 1kΩ across it's 12v - GND pins.
?
I desoldered R18 and tested it out of circuit, it measures 1kΩ.
?
Whilst poking around I shorted something and blew the voltage regulator on the the Nano. Lucky I bought a second Nano!
?
Should the A2 pin on the Nano be 2.5v with the 40 LFP installed? I'm reading zero volts at the A2 pin.
?
I measure 1kΩ between the A2 pin and ground when the LPF is in circuit, 4MΩ when it's not.
?
I measure 0v at the A2 pin with the LPF installed, and 1.6v with the LPF removed.
?
?
?
?
?
?
?
?
?
|
Re: ADX-S V2 build - please help!
Hello Rich
Adam is with me, I'll add a picture of the
finished LPF for 40m
Important is the resistor at the right position (C7) no coil
L1 and no C3.
The black stuff is Plasti Dip so that the coils?
not wobble
?
|
Re: ADX-S V2 build - please help!
Thanks - that helps... I see that R18 should be 1k in series with the 1k on the LFP. Will investigate.
|
Re: ADX-S V2 build - please help!
|
Re: ADX-S V2 build - please help!
If so, you can measure about 2.5V at R18.
toggle quoted message
Show quoted text
在 2024年8月30日，13:35，atkinsonr via groups.io <atkinsonr@...> 写道：
? Confirmed. 1k resistor on this one. LPF board is populated according to this schema: /g/crkits/files/ADX-S/V2/Schematic_ADX-S%20V2%20and%20BAND%20FILTER_2024-07-13.pdf
|
Re: ADX-S V2 build - please help!
I have about 11.2v AC between 12v and GND pins on the LPF.
?
73,
?
Rich
|
Re: ADX-S V2 build - please help!
Confirmed. 1k resistor on this one. LPF board is populated according to this schema: /g/crkits/files/ADX-S/V2/Schematic_ADX-S%20V2%20and%20BAND%20FILTER_2024-07-13.pdf
|
Re: ADX-S V2 build - please help!
Hi Rich,
Please confirm you are looking at the V2 manual and the LPF module has a resistor on it.
toggle quoted message
Show quoted text
在 2024年8月30日，13:30，atkinsonr via groups.io <atkinsonr@...> 写道：
? Hello
?
I'm new to amateur radio and this is my first radio build.
?
I have assembled the main board and the 40m LPF, but all 5 LEDs remain lit with the LPF board installed.
?
What have I tried?
?
At first I thought it might be the microcontroller board;
?? a) so I tried the 3v3 and 5v tests at R1 and U2(Vin) respectively, all good.
?? b) I reflashed the microcontroller with the hex file (it flashed fine but didn't fix the issue)
?? c) I bought a new arduino nano, flashed that - still all LEDs are on.
?
I don't have a spectrum analyser, only a DSO, a multimeter that measures Hz and an ATU-100. Connecting the ADX-S V2 to the ATU and a dummy load, I see no power measured by the ATU.
?
Holding down SW1 and SW2 does not make the TX LED flash.
?
Two LEDs are lit on the Nano (pwr and L)
Ther BFO LED is not lit.
?
Advice on where to probe, what to look for would be most appreciated. I have a DSO and multimeter.
?
73
?
Rich VK2 LTC
|
ADX-S V2 build - please help!
Hello
?
I'm new to amateur radio and this is my first radio build.
?
I have assembled the main board and the 40m LPF, but all 5 LEDs remain lit with the LPF board installed.
?
What have I tried?
?
At first I thought it might be the microcontroller board;
?? a) so I tried the 3v3 and 5v tests at R1 and U2(Vin) respectively, all good.
?? b) I reflashed the microcontroller with the hex file (it flashed fine but didn't fix the issue)
?? c) I bought a new arduino nano, flashed that - still all LEDs are on.
?
I don't have a spectrum analyser, only a DSO, a multimeter that measures Hz and an ATU-100. Connecting the ADX-S V2 to the ATU and a dummy load, I see no power measured by the ATU.
?
Holding down SW1 and SW2 does not make the TX LED flash.
?
Two LEDs are lit on the Nano (pwr and L)
Ther BFO LED is not lit.
?
Advice on where to probe, what to look for would be most appreciated. I have a DSO and multimeter.
?
73
?
Rich VK2 LTC
|
Yes, I can see the page and the info is very helpful!? Thanks.
?
Ron
|
toggle quoted message
Show quoted text
在 2024年8月27日，23:17，Ron Stone via groups.io <rsstone2@...> 写道：
? Adam,
?
Thanks for the pixie diagram with the changes for 20 meters.? With these values, the AADE filter analysis program shows the filter notch around 35 MHz instead of at the second harmonic (28 MHz).? This is based on an inductor value of .43 uH (12 turns on a 37-6 core).? In contrast, the AADE filter program shows the filter notch for the 7 MHz pixie right around 14 MHz where it should be.? Did you take some measurements of the actual hamronic suppression for the 14 MHz pixie and if so, what were the results?? Thanks again.
?
73,
Ron (KA3J)
|
Adam,
?
Thanks for the pixie diagram with the changes for 20 meters.? With these values, the AADE filter analysis program shows the filter notch around 35 MHz instead of at the second harmonic (28 MHz).? This is based on an inductor value of .43 uH (12 turns on a 37-6 core).? In contrast, the AADE filter program shows the filter notch for the 7 MHz pixie right around 14 MHz where it should be.? Did you take some measurements of the actual hamronic suppression for the 14 MHz pixie and if so, what were the results?? Thanks again.
?
73,
Ron (KA3J)
|
Re: 7010 crystals shortage
Pixie2023 7025&7030 is the choice. If you cannot order directly on my web store, please let me know offline.
Thanks,
Adam
在 2024/8/19 8:23, Adam Rong via groups.io 写道:
toggle quoted message
Show quoted text
Guys,
I will consume all the 7010 crystals very soon, and it is your choice to replace with 7020 or 7025 crystals. That said, the Pixie2023 will become 7020&7030 or 7025&7030 instead of 7010&7030. Please vote.
Thanks,
Adam
|
Bill VE3MRX