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Allison, for -6dBm output level? also means the current in the amp needs to be increased also for better liniarity.

I don't know the circuit of the hackRF, but I wouldn't use any antenna connected to the SDR. You could fry its frontend unless it has some protection (I.e. Back to back diodes) at the antenna input.

Harmonics of the HP8640b are of the order of -50dB at output of the gen upto ~+10dbm..

Great you found the likely cause of the 2IF spur. Now why is the 45mhz IF distorting? Two things, it needs to be clean to at least -6 or so DBM and how much gain is needed to get to that from the

As the saying goes two heads are better than one, good to hear it is finally cracked. 73 Steve

Should read: "In the si5351bx routines as I wrote them, you simply adjust the value of si5351bx_vcoa" That's how I do it in my own code. But in the example code scrap of post 54501, I hacked it to

Yes , let us known where can we can find a download about default settings . 73 , Jens / HB9JOI +++ Sent: Saturday, November 3, 2018 3:31 PM To: [email protected] Subject: [BITX20] Ubitx Backup

Somebody asking a non *Bitx* question here should give a full description of what they have and they are doing.? (This applies to those asking a *Bitx* question as well.) And they should make sure

Vince says: This applies to pretty much all si5351 builds, so may actually be pertinent to the forum. The 25mhz crystals typically available are tuned on the assumption that there will be maybe

Hi erry, My comments were in a completely different universe :) I assumed being posted here it was something it is not. While we all know about "assume" it isn't unreasonavle to expect questions

I looked at your project and see you're using the adafruit si5351 board. There was an issue some time ago and recalling from a hazy memory it had something to do with crystal loading and the si5351

I have no sophisticated bench test gear so I used my hackRF and the free Spectrum Analyzer software to 'look' at what my uBitx was transmitting whilst on FT8 on 7.074MHz and the result is quite

The etherkit library is totally different than the si5351bx routines used on the uBitx. So my discussion of the correction factor may or may not pertain. Good luck.

Hi Bill. True at the moment. I'm actually using a Mega2560 to control the Si5351 board with a 3.5" TFT LCD interface. The software is based on the VU2SPF and VE1BWV sketch, with the appropriate

Hi Jerry. I have not as well, but I wanted to check to see if my symptoms jogged anyone's memory. :-) I'm not sure if it is; I haven't actually checked. The sketch I'm using to test the Si5351 is

Hi Jerry, When I replied with a suggestion he told me he is not using a Bitx40 nor uBitx nor a raduino nor any of the Bitx or uBitx software. -shrug- 73, Bill KU8H -- bark less - wag more

I have not heard of others in the forum voice concern about the si5351 calibration changing.? Unless you are using different firmware or there is an error in the firmware, that sounds like the 25mhz

Hello everyone! Today I played a little with my Ubitx, I made a lot of contacts all over Europe. After a while I decided to listen myself on a SDR located somewhere in Norway because I wanted to play

Hi Mark. None. The calibration sketch is here: https://github.com/etherkit/Si5351Arduino/tree/master/examples/si5351_calibration This sketch simply programs the Si5351 as an oscillator, no

Sorry for the above message. The audio is there its just very low. I should have checked the info on the web site re this problem. and? Shall? have to get an amplifier to boost the audio A Redface