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All, So I set up a test station in the garage, and was trying out the Chinese linear again. The uBITX was feeding the linear in CW mode, and I was giving it toots with the mike switch. The linear was

I’m sure you don’t have a surplus?board with a 2SC3102 Mitsubishi transistor on it, do you? ?I want to get my Yaesu 857 running on VHF and UHF again and need to roll up my sleeves and get some

Wow I probably could have a hundred of those and still would not be able to satisfy the need. They are all spoken for. That said though, I have plenty of other devices, mostly 50V or some 28V devices.

Comments on the TSW kit - it gives the uBITX IMHO a much superior UI to the original. The *hard* part is already soldered ( the SI5351a oscillator chip ). And the support from Jim is excellent. Mine

I appreciate y'all coming up with this backup supply of compatible Raduinos. I'm sure it has helped many people. Gordon KX4Z

FYI, TSW's Teensy 4.1 based Raduino for the V6 uBITX is still available and being shipped.? Even though PJRC.com is temporarily out of stock with Their Teensy 4.1's, www.mouser.com (

Evan, no problem. Just enjoy your ride. I gave up my bike a while ago as it was getting too dangerous out there with the idiots on their cell phones and high on some junk. Be safe. Barry

Barry, That current sounds high. I am on an overnight motorcycle trip so cannot measure my v6 for comparison. There is a voltage chart in the files section of this group for a v4. The circuits are the

Hi John, I'll take one. Paypal you the shipping? - Jerry KF6VB p.s. Are those Chinese kits that use the similar device any good? Are they better than the ones that use the two 530 fets?

Gents, I cleaned out an old transmitter building that will be demolished later this week One of the items I have and will be available to the group for shipping cost are Transistors ACDN301M. It is a

David, It is also possible that the IMD is being generated in the two tone generator! To know this, insert an attenuator pad between the generator and the specan. You should see the imd go down by

I would suggest that you put in a 6db pad in place of the mav11. It will work all the same. The noise figure will be much less but the iip3 will be much better. wrote:

David when you put this 12 dB gain in front of that mixer, the effect is to reduce the IIP3 of the mixer by 12 dB.? if you compare the input of the mixer (reduced by 12 dB) to the output IP3 of the

I saw the link in a post from 2018, So the idle current draw may be higher now that there is a large display to power.? Maybe someone here has done a recent bias adjustment...

https://www.hfsignals.com/index.php/ubitx-tuneup/

Curt, Thanks for the quick reply.? To test the Two-Tone generator, I fed its output through an attenuator to my uBITX and tuned to the expected distortion product frequency.? I couldn't hear

David I cannot easily see from here - but possibly you are only looking at the amplifier ITOI by itself, and not its impact on the chain? Farhan had placed a cumulative calculation tool at his website

Greetings from North Carolina.? I'm a uBITX owner and have lurked on this group for some time.? Lots of good discussion. I have built a fairly close copy of Farhan's Specan analyzer, plus the

Evan, both bias pots are set fully CW, zero gate voltage. In SSB mode, the TX idling current is over 900ma. Something is pulling a lot of current but nothing seems hot. In RX the current draw is about

Barry, The best way is to measure the current is to first rotate both bias pots to full clockwise position, ?note the current, then increase each pot one at a time to get the total current 200 ms