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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

look at that : http://n6qw.blogspot.hr/ http://www.n6qw.com/ http://ak2b.blogspot.hr/ here you will find many interesting stuff. 9a3xz,Mikele 2016-12-06 20:15 GMT+01:00 Jack Purdum

Good to know. My mission is to see more ham projects using microcontrollers and this seems like a good fit. Thanks! 72,73,Jack, W8TEE To: BITX20@... Sent: Tuesday, December 6, 2016

You're not missing anything, Jack. It is falling-off-a-log easy to change the code from 25 or 27MHz. It's not an issue, other than being aware of it. NT7S's documentation makes it very

Joel I'll build the 3.5-5 MHZ one and let you know. 73 Ken BITX20@...> wrote:

Ken, I built the one on the top of the list as it covers 3.5 to 5MHz which is the exact frequency of the VFO coverage, although being A LPF it's going to filter everything above so may not make that

Am I missing something or can't the software be changed to account for the difference? Our VFO has a timing constant in the code that is changed to account for variations in the 125MHz crystal on the

Hi all. Just a word of warning/advice. The Si5351 based VFO (clock) boards produced by Hans (QRP Labs) and Adafruit are not directly interchangeable for use within the many Arduino based VFO

Joel I built NT7S 5-8 MHZ filter and I don't hear any real difference. But the signal into T2 is much prettier than the square wave. I'll do some more testing later, not much can be done at 5:30 in

Hans, Sorry about the ugly square wave, you are right, we can't see it properly on a regular scope, but I was looking for a sine wave which I got after the LPF. I don't know if we need a sine wave

I just got the new 40 m version three board in the mail three weeks ago. Very pretty packaging I might add. Unfortunately this thing seems not to like S9 phone signals in the extra class portion of

Hans, Yes that's the one. Well, I guess I'll stick with the DDS VFO instead, easier in the long run. Thanks anyway. Joel Caulkins KB6QVI