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Might be easier to work on the bitx40 than you think. Have you tried? I find the 1206 C's and R's much easier to work with than through-hole parts, using two soldering irons to remove them. On that

I ran some math on your measurements, assuming 5 W maximum output and your carrier would be right near 30 db down. for comparison, an older model ICOM-28 was specified to have at least 40 db carrier

Hi Sarma, thanks for the suggestion, I will consider your idea for auto band switching in raduino v2. However even if we offer auto band switching, I believe most ops would still want to have an

OK will check. I checked the carrier output (no mic and the PTT grounded). I get about 1.5V p-p into a dummy load. That equates to about 5 mW. Not much, but enough to make a CW contact by keying the

hi Allard, I suppose that following procedure could be implementable for a possible 2 band working. Initially the VFO would start with 40m band with LSB and 10/12MHz BFO switchable with fine

OK i modify my article accordingly. Thanks again Alllard.

Since v1.20, Jerry's minimal si5351 routines are included in the sketch code. Hence we don't need to install the si5351 library anymore. Note that the sketch still requires some other libraries (wire,

Hello Allard. No library is to install? I can delete everything related to the installation of libraries?

Dear Jean-Jacques, thanks for the French translations. I noticed that on this page there are still instructions for installing the si5351 library: Installez les bibliothèques depuis le programme

Hello. You will find the instructions for using the Raduino v1.26 from PE1NWL, translated into French on my website. http://www.f1nqp.fr/articles.php?lng=fr&pg=656&mnuid=450&tconfig=0 (

Thank you Allard. I'll come here post some pictures :-) Good day to all.

e are duiscuissing around BFO carrier leak. As has been explained well that a chip dual diodes are internally balancedenough. Even if suppose one uses discrete diodes,one *could minimize but not

Grayson, Measure the DC voltage in both RX and TX modes across C107. It should be zeroif not you will have a carrier leak. You complaint that external modulation sounds bad could be something related

Hi All, I have been thinking of moving the BITX40 to 144 MHz. 144 MHz is a common tunable IF for Microwave Hams. The FT717 is very popular as a tunable IF, however some are still using IC202 and

Grayson KJ7UM wrote... I don't think it's a design problem. You are suspecting the diodes. You might be right, but perhaps it would be worth looking at the connections for T4. Perhaps there is a bad

grossly testing my rig tonight (with a receiver right near it) I can hear some carrier also but it doesn't move the SWR or power needle at all on a cheap SWR meter, and whistling I can get several

Grayson KJ7UM wrote... See the hand drawing that I posted. I marked them D15 / D16 like in the drawing, even though it is a dual-diode in one package. I think Dexter said it is labeled D20 now. I

The dual-diode is labelled D20 on the board, and it's inside the triangle formed by the pads for a large version of the Pot - which is depicted. D20 is obscuring the wiper pad for the smaller

Grayson KJ7UM wrote… Attached is a very crude hand-drawn component placement drawing. It doesn’t show every part, but has the transistors etc. marked, so it might be enough to direct you to the

My own board is nearly one year old and it still has the balance pot installed. Could you perhaps make a photo of this area on your BitX board and share it with us? I'm sure someone in this group will