I think I'll need to find some shielded inductors for this filter as recommended by Raj. I used the ones I mentioned previously. I also noticed that I had the function generator set up incorrectly to

Thanks Raj. I'll pick up some 51pF caps Monday. My local parts shop gets worried if they haven't seen me in a day or two... I'll try parts I have on hand first. Otherwise, it'll be time to put togethe

This is a V3 that has new relays and the L5/L7 fix and working on the LPF that I believe is before the mixer, but I'm not sure. I've been taking measurements at each step. So far not significant drops

Good point. Earlier in this thread it was recommended that I add a LPF to get rid of the spurs on 15, 12, and 10m. It was my understanding that the following (from Ashar I believe) is the one (though

I was about to dig into my parts bin searching for toroids and I remembered I had those left over. I'll probably have to order some 30 uH parts. 27 and 33 are easy to get locally, 30 maybe not. Sounds

Well, that didn't go well. Looking at it, the two toroids on the left are a little close. I have a layer of grounded copper foil between the PCB and the filter (insulated of course). I might rebuild t

I'm afraid it was already set to the half way mark. Is there something particular I should be looking for? At this point I'm having enough fun taking measurements and improving things as I go along. T

Thanks, I'll look into that. John W1JDS

I did post some CW data a few weeks back as I swapped out the relays and inductors. Some of the data is suspect given unexpectedly high power readings. If you can read an Excel file I can send the who

I guess it could have been worse, I could have types 50MV :-) This is a v3 that I finally got around to playing with a couple of months ago. It had been in the project stack for quite a while. For now

I set up to do some SSB testing getting putting about 50Vpp in. I don't know if I read the right peaks or not, but I looked for the strongest signal that wasn't a harmonic. Don't know how I skipped 17

The harmonic at 30MHz went from 46 dB separation down to 41.49 when I removed the capacitor from the circuit. I'm not trying to analyze at this point, just being mechanical about it... -j

Yes, this was done in CW mode. 12V LiPo Battery pack (link) 40dB homebrew attenuator which I've characterized as being pretty flat Agilent E4404B SA & HP 8595E SA depending on which one I could use at

I uploaded a spreadsheet of my measurements for my ubitx for 80,40,30,20, and 10m: 1. Stock 2. Replaced L5/L7 with SMD inductors I found locally, kept C211 in circuit 3. Replaced the relays 4. Replace

Thanks. I have parts on hand. That looks like an easy fix. - John

Same here down in Silicon Valley. They were at it until 8:30. I called a few times after but no luck. I listened on and off the whole time but didn't hear any call signs either. I've been having a rou

I've been thinking of making an Audio/Interface PCB for the BITX40/uBITX. What would be good to have on it? Microphone Speech Processor: Jeff Cummings's design using the SSM2167 AGC: Which is the curr

I bought a Creality3D CR-10 earlier this summer that I've been keeping pretty busy. The print volume is 300x300x400mm build volume. I chose this one with enclosures in mind. It can be bought from Chin

I had looked at that one, but the fit wasn't quite right, delivery time didn't meet my need for instant gratification, etc... :-) I've had my cable installed since April and have been pretty happy wit

I didn't notice anyone mention these, but I do tend to miss things... Short adapter cables are available from Adafruit and Amazon that allow you to update the firmware/sketch without opening the case.