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L4 is in the center of the board, next to C93. How do you know? Tune to a frequency and put your finger next to it. The VFO will change frequency violently. If you are going to use a DDS, the VFO

you must remove the L4 for the dds to properly work BITX20@...> wrote:

I am finding the sensitivity to be very poor with the DDS. Did your sensitivity improve when you removed L4? And, is L4 the coil that is right next to the DDS jack? I can't see the markings on the

Precisely. Each rig is slightly different. You must choose the sound you want to hear, and adjust the signal to fit the slope you want in the passband. If you are happy with it the way it is, leave

If you attach the antenna, does the noise go up substantially? If yes and if you can hear only CW stations but no SSB then you have to just move the trimmer gently to cover the SSB portion of the

Same issue here. Can barely make out station that is s7 on store-bought rig.

Someone has probably mentioned this already, but out of the box, I’m not sure it tunes very far into the US phone portion of the band. Sent: Tuesday, December 06, 2016 9:33 AM To:

There is a longer explanation to this. The crystals we use in the BITX are microprocessor grade. This means that they are not very precise. Uma is the crystal sorter. She takes a bunch of 1000

OK I am confused. Isn't the IF 12 MHZ? The 12 MHZ is mixed with a BFO of 11998.8 KHZ giving a 2.2 KHZ audio passband? 73 Ken BITX20@...> wrote:

I set mine to 11998.600 because that was my BFO frequency. Farhan says it should be 11998.800 YMMV. Joel Caulkins KB6QVI

Bill, Could hear you clearly for about 2 minutes- now it's faded.I called back to your CQ but you may not hear me 5 watts with a hamstick dipole in Winfield, IL- near Chicago. Using a Forty-2 by

so I am at a stop point and need some help from the community. Have a bitx40v3, purchased a qrp-labs vfo. All tested and seem to be working. Could someone help by leeting me know what the IF freq

at 1930 EST? 0030Z tonight

It is not just a 2 Mhz offset that you have to change. The oscillator is used to set the internal pll s in the 5351, and different divider ratios have to set depending on the oscillator frequency.

If you are using an Arduino to drive your vfo you should be able to write a 2 Mhz calibration offset in the code to accomodate either a 25mhz or 27mhz. Crystal. ?Typically the offset is a

There is also a hardware solution, you can easily change they 27.000 MHz crystal during the build of Hans’s Si5351a board, or install a 25 MHz TCXO as there are pads on the board for that. The TCXOs

Pete, N6QW, is an absolute genius when it comes to building something, as his LBS rig proves. He's forgotten more about electronics than I will ever know. In Tom VFO video, he uses a push button to

Todd, I would only say that it is 'falling off a log' easy if you can and are willing to program your own code changes The point of my post was simply to inform those amongst the group who are not au

Be careful using N6QW, Pete Juliano's code from the LBS. The libraries for the SI5351 is incorrect. Don't get me wrong, Pete does fantastic work. Our club did the LBS as a group build and we quickly

Self explanatory - //initialize the Si5351 si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0); //If you're using a 27Mhz crystal, put in 27000000 instead of 0 // 0 is the default crystal frequency of