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i used a two section LPF, with a corner freq of 36 mhz. 47pf, 300nh, 100pf, 300nh, 47pf. the lpf had to be mounted away from the mixer to be clean. i dont know why. - f

Will this new discovery require any work in the areas that Allisons power flatten mod provides? changing the 6 3904’s and other related parts. Reason I am asking is I am about to do that mod (easy

All three local oscillators into the uBitx that determine the operating frequency are sourced by the si5351. And the clocks out of the si5351 are strict ratios of the 25mhz reference frequency So any

Here are some other softwares you can try. https://www.rtl-sdr.com/spektrum-new-rtl-sdr-spectrum-analyzer-software/ <https://www.rtl-sdr.com/spektrum-new-rtl-sdr-spectrum-analyzer-software/>

I’ve used my 100 watt radio next to a receive antenna for a rtl-sdr. I have fried am/fm filters and the sv1afn upconverter (a few times) but never the dongle. I have locked them up on the usb bus

Yep, this keeps coming up in different forms. I agree you need to attenuate your receiver because of overloading the receiver. You are showing a common overload image on a SDR receiver. With my SDR I

FWIW when I operate 20 meter FT8 with my uBitx the WSJT-X waterfall display clearly shows about a 200 Hz upward drift for the first 10 to 12 minutes after I power it on. I don't know how that would

Agreed on the front end of the hackRF - this one has already been repaired by me as a friend gave it to me and said, it's deaf - if you can get it going again, it's yours as I have got a new one! They

Further research reveals that this is some audio pop error that is fixed when TX is on, but when someone wants to practice morse, there's that anoying pop again. Reading through the forum, I found

Allison, a Mini-circuits "PHA-1" might do the trick. I don't have any though. I don't know how you would get on with it switching direction, back to the Rx side in the Bi-Amp arrangement. Somebody

Right now the 45MHz amp has a gain of about 17dB at 45Mhz and is 3.3dB down at 90Mhz. Total current draw in my proto build is 32mA.?? With? 3.1mA ? in the 1st emitter follower and 13.3mA? in the

Hey Nigel, what free Spec. Analyzer do you have? 73 Ken VA3ABN

Glen. Yes that the problem.? Or it could be that the two emitter followers are not following... Hint that circuit at 12Mhz works ok, at 45mhz no so much.? ?Compound amplifiers without feedback tend

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 use

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 file