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I'd say C212 and L7 form one matching network, C214 and L5 form another matching network. As Curt noted, the 0.1uF caps at C211 and C215 are extremely large at 45mhz, pretty much 0 ohms AC

Thanks Curt. I probably meant C212 which is 22pf. Gets a little rough remembering component numbers when youre trying to recount. :)

Joe C215 is part of the matching circuitry used with the 45 MHz xtal filter -- 0.1 uF is a pretty large value at 45 MHz -- and it is large enough that it resonates with the coil way above this.? it

So it’s looks like I got to the bottom of the problem where RF seemed to be getting into the delay of the CW and causing chattering in my auto tuner plus a hiss in the speakers. It was due to the

The power mod is easier then figuring out spurs and harmonics. You certainly don’t need that expensive scope for it :) I just did mine and I guess I’m getting the 14w on 80 and 6w on 10 like

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.

John very good - I am interested in your results on this, and which ubitx version you have.? on 12m you might notice 2 spurs on either side of the carrier about 5 MHz apart,? the v5 comes with a

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

John You aren't clear in this message which spurs you are trying to solve, nor where you are putting this new filter? If this is an added 45 MHz filter, adjacent to the mix to and from RF, then its

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

John, Very neat job on L5 and L7. Make the 45MHz IF new filter with SMD parts. What seems to be the culprit is any vertical wire leads in that area causes trouble. Solder the SMDs directly on the

Ok, I have mounted the LPF filter in a Manhattan style without any glue so I had more flexibility in positioning the toroids, which are very light. I am not sure I understood your spreadsheet. The

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

I use this ,from qrpkits.com{Pacific Electret Microphone kit.Works great [image: image.png] Dale/ka5who

Update: success with the signal analyzer install! I have moved into my new shack, but no antenna feed through? yet. So will test tomorrow. A lot accomplished today! Waiting on the new bc645

I thought about that but I wanted to reduce the stress off that 7805 on the raduino, so I added the buck converter to run the display and the extra nano. I have loaded the signal analyzer software on

Total current would not be even 1 amp, more like 100 ma.? Should not be a problem.? I do know that Dr Lee ran all of the devices off of the same Raduino supply, just added a heat

I just thought of another possible problem, Q74 might be shorted.? This would follow the symptom of the injected audio at the volume control not getting to the earphones. I had feedback is and

If you have access to a frequency counter or an oscilloscope I would next check the 3 clock signals coming from the Raduino to the uBitx board.? If you measure approximately 45 MHz- dial setting in