Yes, thanks Raj. I was confusing the pot numbers...I was adjusting RV1 not RV136. Found the problem to be a dead Q13, which seems to happen a lot! =Vic=

I tried the 90.1 uF cap in series with the AF filter output but it didn't help. My filter is always on, but there is no noise from it when it is bypassed, so I don't think it is generating noise on

Apparently that number is the board number as tested from the run or #71 of Run 1. Yours ordered on Dec 9th while mine ordered on Dec 10th was something like #322/1. They were certainly cranking

Ok - found a circuit on this group that removes my confusion. https://groups.io/g/BITX20/attachment/25914/0/BITX3_C_3%20ADE%20MIX.png You have it wired correctly Martin! The data sheet is not very

We agree that we need to inject the DC into pin I in the circuit (the centre tap on the transformer). I believe this is pin 6 (LO) for port I and not pin 2 (IF). In your circuit diagram you have LO

This is one of those "We'll see how this works" things I think. The guy who I've been talking to knows his stuff pretty well when it comes to building radios, so I trust his advice. He's got some

Amplifier Research Model 777 is an RF leveling preamp. It uses a mini-circuits mixer as an attenuator. First time I saw one used for that. I had to modify one to smooth the output. It was in the

Dave,

Here's his board design, ADE-1 is bottom-right of the first sheet: https://groups.io/g/BITX20/attachment/38900/1/uBitx_top.pdf Here's the ADE-1 datasheet:

Also, why not a whole kit option? would that not cut cost?

I say make a Kickstarter or indigogo. I think more people might be interested in this. I for one would be happy to have all this in one board solving many mods at once. Not to mention an ATU in the

A reasonable idea. Main thing will be to have both pads close enough together for the 0603, but large enough to accommodate the 1206. I've done 0603's across a 1206 pad, but it's a PITA, and not easy

Hi Mike, Check out the datasheet for the ADE-1 here: https://www.minicircuits.com/pdfs/ADE-1.pdf . Page 1, bottom right side for the electrical schematic, you'll see the "I" pin has a DC connection

Ok - I understand how it works now. The one remaining question is how injecting DC into the output side (IF pin) of the mixer (as you have it drawn) would unbalance the mixer? Doesn’t this look

Maybe consider a 'special' footprint that will take any smd size from 0603 to 1206. Seems there is plenty of room, in the main, to do this. glenn vk3pe

I ordered mine on Dec12 as a preorder. I just recieved an email that mine has shipped via DHL and to expect it on Tuesday Aug AG5AT

I ordered a hand full of nano boards to learn more about programming the part and set up my development project..I got it all up and running in a few minutes. I ordered 3 boards for under $10 on ebay

So, without any major modifications to the pick structure of my design, here's what I got back from Macrofab (US based in TX). As you can see in the attached, the raw PCB cost is about $95 a pop, in

Another group member Bill found his Q13 dead.. so seems like something iskilling them! Raj

Vic, RV136 is DRIVE and not bias. Bias is RV1, please leave it alone for now and see suggestion below! You may have a problem with soldering of L6 or L7 or the relay K2. Raj