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It should be possible to test the LPF selection process with a DMM.? Use USB, set the drive to 1 and the mic to 0.? Then, measure the voltages on the banded sections of the selection diodes.? Only

So, the USB port is microUSB, not USB-C? A little disappointing, but I guess the C is larger and there wasn't room? The rest is very exciting, and I'm waiting with bated breath for

“Is it possible that the software got crazy and didn't enable any section in the LPF filter? 73, Wojtek” It’s unlikely that the software is doing anything wrong. It’s more likely that some

Please see this message for more information, it was sent earlier today: /g/BITX20/message/115933 Ken, N2VIP

The below message was an answer to sa7buj. pt., 28 lut 2025 o 22:03 WZab - SP5DAA via groups.io <wzab01= [email protected]> napisa?(a): -- Wojciech M. Zabo?otny My GPG/PGP keys: standard:

HI Jim -- this has been explained in recent messaging. Take a read and you'll learn everything you are asking. 73 KX4Z [email protected]> wrote:

Hey everyone, Since we're at the end of February.? Just wondering if anyone received their zBitx yet.? any reviews etc.? If not is there a date when they will be shipped/Delivered and available

I misunderstood you, I thought this was what you was searching for. Swing and a miss I guess. Haha David [email protected]> wrote:

As shown in the scope image, I have ca 4.5V peak-to-peak there when transmitting.

Is it possible that the software got crazy and didn't enable any section in the LPF filter? 73, Wojtek

If after de-soldering of C30 voltages on Q30 will be near voltages of Q10, so: E= 1.6, B= 2.4, C= 7.9 Then You need to replace C30 with any 100nF (0,1uF) ceramic capacitor. If voltages will be still

Hi Richard, Really sorry, my mistake, I have measured C10 again to the ground and this is also ~823 ohm. But don't bother with C10, nor C30. This is the same as measuring resistance from base of Q10

Wojtek, the scope photos were very helpful. That transformer is supposed to Step UP the voltage, not down.? ?So something is terribly wrong, and it appears tht bothof your FETs are doing fine. You

This is from Farhan re upgrading my V2, "The standing current in the diodes that switch the LPFs was found insufficient on 3.5 MHz, hence, the resistors R201, R202, R203 and R204 are changed from 470

Joel, FYI, changing the resistors increased the bias current on the PIN diodes for the LPF and T/R switching diodes.? This was to reduce spurs and improve power output, 73 Evan AC9TU

One of the things to change is R201-R204 to 330ohm 1/4 resistors, I remember doing mine but I don't remember why, other than that I don't recall doing anything else. Joel N6ALT

Before I stat removing components, I'll report the following based on your last suggestions: Resistance from base of Q30 to GND = 50.8 ohms, no where close to 836 ohms. Resistance from base of Q10

pt., 28 lut 2025 o 20:38 Evan Hand via groups.io <elhandjr= [email protected]> napisa?(a): As shown in the scope images, the DC of the drain voltages remain at ca 12V. It was the DC multimeter

JJ, I do not have the documentation; I have only the GitHub files with the original V2 schematic. The zip file is attached. 73 Evan AC9TU

Wojtek, Is your power supply voltage dropping?? Strangely, the drain voltages drop when you key the mic.? This could suggest that T7 has an issue.? Confirm that you are seeing the drain voltage