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Hi I bought this kit, $11 <http://www.kitsandparts.com/bridge1.3.php>, with the idea to use it with the BITX40. It is still unbuilt. Maybe using two of the analog input pins on the NANO, we could

John, Hope that rant on mixers wasn't too far over the top. ?One of the reasons I find this forum (and the Bitx40) compelling is that I am learning a good deal. ?Trying to explain something like

Maybe oscillating, but I really don't understand this one. ?My impression is he's not hitting the PTT button, just touching the heat-sink with his finger. ?So no 12v TX rail into the 5v regulator

Hi Jack, Yes that's just the job, I intend to use the raduino that's already present in the bitx, so basically only need the swr bridge to test the swr for the operating frequency, I'll take a look

It is not going into transmit, and probably not into avalanche. It is probably going into self-oscillation. You may need to install a 10 ohm resistor in the lead right next to the gate. john AD5YE

Well, Fred, you actually get a whole lot more mixer products than that. You set the system to accept one as the IF and suppress the others. Not a simple job. And Jerry, very nice. Now how does one

To mix two frequencies requires a non-linear device, in this case the diodes. When we mix two frequencies we get the sum, the difference and the two original frequencies. Only one of the products can

Yes. I'm using the AD9850 and Mega 2560 for the VFO and TFT display. However, the board I'm using is actually part of an antenna analyzer build that my club did.

Hello all, Does anyone have any thoughts on implementing a built in swr bridge for the bitx? I figure it would reduce the need to carry round a stand alone meter when the arduino driving the DDS has

Very true, Peter. Now tell him where to find the hex file. For many novice programmers, it's easier to compile and load the source because the hex file location depends upon how the compiler was

Hi Roy Goto http://www.hobbytronics.co.uk/arduino-xloader and download and install XLoader. Then just load up the .HEX file in XLoader and upload it to the Nano. There is no need to load up the

You probably need more than that mag loop for an antenna. ?If stuck in an apartment somewhere, I'd probably go with an end-fed-halfwave using 28 gauge magnet wire, strung out a window and up into a

Yes, ?here's my BITX-40 ... It's still a work in progress, I've got 2 BITX-40 here, One is standard, And this is the other one, I've to make the filters for it , I've been using this one ?to try out

Hi all, radio newbie here. I've got a bitx40, rev 3, not raduino. It is my only/first radio. I've hooked it up, and have been testing receive (using a homebuilt mag loop, 4' diameter, I don't have

It may not be obvious that the balanced modulator at D15,D16 is multiplying anything. ?Consider this: ?When the 12mhz bfo is on the positive side of its cycle, both diodes are fully conducting.

I just wanted to say one more thing. I ordered two big 4cm knurled shaft knobs for a smaller tuning pot because of the flakey frequency flutter that needed a delicate touch and patience. The flutter

The BITX 40 uses a LM386 audio amp with plenty of drive. A small speaker is easily over driven. You could take off the SMD cap next to the LM386 which might be better suited for small speakers. I am

Thanks for the clarification, this is all new and sometimes I'm just grasping at straws! :-)) Roy WA0YMH Carrollton, TX [email protected]> wrote:

Even when you load Bitx Raduino code, you'll see that LED lights up or occasionally blinks, but not at regular intervals. This LED is connected to the Arduino's D13 line which is one of the lines that