No problem Ted, we're here to help. Glad you got it now. Good luck with the rest of the mods! 73 Allard PE1NWL

Think I have it now. First it was not the PTT sense mod. I should have said the TX-RX Wiring Circuit mod which says the base of the NPN goes through a 4.7 k resistor to D7 on pin 16 of P3 and my schem

Allard I have a schematic for the Arduino that shows the D7 is on pin 1 of P3. page 3 of 10. And pin 16 goes to the input of regulator U3 on the board. Do know if this has been changed? The date on th

Allard Could not find web site. Photo of schematic. Begin forwarded message: From: BevTed Stanier <bevtedstan@...> Date: August 14, 2020 at 7:03:50 PM PDT To: BevTed Stanier <bevtedstan@hotmai

Ted, I believe that the P3 connector pin 15 is the +12v supply to the Raduino 5volt regulator, from the mainboard. At least that is what I know from the Raduino on the uBITX. You get the 5volts from t

Thanks Allard New I must have been confused somewhere 73 Ted Sent from Mail for Windows 10

Hi Ted, \ the numbering is from right to left. So pin 16 is the most left one. In the picture it has a blue wire and it's labeled D7 (TX-RX). 73 Allard PE1NWL

Hi Evan https://github.com/amunters/bitx40/blob/master/operating-instructions.md Here is where I have been doing some mods after updating the raduino software. There is a picture under the title “PIN

Ted, Can you provide the reference to the mod? 73 Evan AC9TU

This mod shows the base of NPN transistor connected to Pin 16 of P3 (pin 16 is connected to pin 15 on the raduino board) through a 4.7K ohm resistor. Pin 15 of P3 is +12v according to the Wiring up th

Hi, I used a four pin connector on the chassis. In my case, I was using an enclosure from amateurradiokits that came with the connector. That said, it would be simple enough to wire up a 3.5 mm plug.

Hello Ashar: I hardly ever overdrive a microphone. I hold the mic next to my cheek with the mic element pointing away from me to avoid transmitting breathing noises. I rather replace the "new" mic's c

How did you wire this nic? Did you put the four pin connector on the radio chassis, or convert the mic to the 3.5 mm?

There is a simpler way to do this. See the mic amp in the attached screenshot. The mic gain is set by the ratio between the 1K collector load and the 47 ohms emitter degeneration resistor (R63). Out o

Looks good. Just ordered one. Price is right, too. Thanks. Bob — KK5R

LDR's have their most sensitive wavelengths at green so you should use a green LED

There are some nice features of this filter arrangement. Filter skirts can be adjusted by the capacitors, and in fact, you can create a variable pass band filter by using varactor diodes to replace th

Ulrich Nice work. I am thinking like Raj that issues are few on the circuit board, but maybe others have found faulty potentiometers. Sensitivity is said to be 0.1 uV but no snr is reported, all of us

#ubitx

Hello Raj, I know that the through-holes and vias are plated. And the plating is fine, without any problems. But the solder-work was not optimal. On several through-hole mounted components, the solder

#ubitx

Hi Chuck - For what it is worth I have a V5 and and never seen the need for a power mic or additional gain. The mic I use is this one - https://www.amazon.com/gp/product/B008CLIB5K/ref=ppx_yo_dt_b_sea