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A0 should be approx 1.25V (LOW) during RX, 5V (HIGH) during TX. If this is not the case, first make sure that U3 is switching on and off correctly during RX/TX. U3 input pin 3 should be 12V during TX,

Yup, output of the 78L05 regulator should be zero volts when receiving, 5v when transmitting. It is powered from the TX rail of 12v, which is zero volts when receiving and 12v when transmitting Check

A0 and A1 both show 5v, PTT on and off. I don't have a key connected at the moment. I understand A1 is pulled low to send a carrier, but shouldn't A0 always be low until it sees 5v from the regulator?

What are the voltages on A0 and A1 if you measure them with a DVM? What voltages do you have when you press PPT or the CW key? 73 Allard PE1NWL

Thanks for getting back to me Allard. No shorts anywhere. I've done the reset and it does the same thing. There is nothing connected to the A1(KEY) wire. Do the CW Carrier and TX-RX connections need

I think that a release that uses the same BITX40 board mods as Allard would be useful. When the new hardware comes in you can then upgrade to new features. ? Bob? KD8CGH

Ah, seems I wasn't signed in, somehow. Now found the photo. Nicely implemented, Jack. Bill, VK7MX

I posted the images to my W8TEE album. Jack, W8TEE To: [email protected] Sent: Saturday, September 30, 2017 6:26 PM Subject: Re: [BITX20] W8TEE pending software release and port(?) #w8tee Can't see the

The fact that your radio starts in CWL mode suggests that it sensed a key-down from the CW key. As a first step, please reset all user settings to "factory settings". Keep the FB pressed during power

Thanks for the replies. It seems like the Raduino thinks the radio is in TX mode - the radio itself is not transmitting. But, it does react to the PTT being activated. After initial power up it's in

Hi Luther It sounds like the radio thinks it's in TX mode when you turn it on. Is it actually in tx, or does the raduino just think it is? Brent VE3CUS

This post might help: ? ?/g/BITX20/message/23973 ( /g/BITX20/message/23973 )

hi all, ?just started to assemble the bitx40. ?new to kit building....confused on the e DC power connection instructions. i route the two-wire connector from the PWR1 on the board to the power

I have not had all of these problems, so just some guessing.? I have seen the TX show up when it is not suppose to.? I am using an older version for now. Sounds like wiring or floating inputs

Can't see the image Jack. Thanks for picking up the RTC suggestion. Bill, VK7MX

All: On Monday I will be releasing version 1.07 of the software for the BITX40 transceiver. The only visual difference is that there are provisions in the code for a DS3234 RTC module, as seen in the

Good evening all. This is my first post here, but I've been lurking for a little while. Sorry if this has already been discussed, but... I'm currently using Allard's code (ver 1.24) and would like to

Yes. I have ano lm386 module from kits and parts

Hello I have the same kit and have a DDS built already. Is their a list of components that can be left out given I am going to connect the DDS. I dont need the on-board VFO. Thanks Laurence (KB1HKO)

I put mine a 1/8" endmill in my mill so I'd get nice accurate, straight cuts. Then I used a file to square off the rounded corners. Vince. -- Michigan VHF Corp. http://www.nobucks.net/