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Hi Halden, I don't believe that measuring the capacitance value helps in this case. My 30m QCX was low on power and replacing the two blue capacitors C25 and C26 was a big improvement. Before I

You can use a smaller diameter wire for T1 for your QCX80 or just scramble wind the toroid as the manual indicates. I had a real hassle winding the coil for the QCX40. ?It just fit with the provided

Your capacitors are most likely as marked.? An LCR meter will show different readings depending on the frequency used by the meter.? If your meter would use a lower frequency, the capacitance shown

One of the problems, I think, is Relay 0 and the jumpers are not shown in the U3S instruction manual's schematic. The switched relay board's schematic only shows the 5 relays that it controls. But,

Yes, that's the one I used..found it after my first post.? This should save a lot of time trying to count turns accurately, and wear on my nerves. -- de K2TL.. since 1964

Jim K2TL Use the calculator at <http://www.toroids.info> to find the inductance of 68 turns. [image: image.png] Arv K7HKL _._

..I may have been able to answer my own question.? Found a toroid winding calculator online.? Seems that 68 turns on a T50-2 is about 23uH.? Opinions? de K2TL.. since 1964

Can someone tell me the inductance of S3 for the 80 meter T1?? I lose track trying to count 68 turns and it would be a whole lot easier just to measure S3 for the proper L.? Everytime I count the

Halden NR7V Running the filter design in a circuit simulator like LTSpice and using Monte-carlo analysis should show the effect on performance at various levels

Hi all... I've been reading on this forum that there have been some issues with the bluish capacitors for the QCX low pass filters.? I recall that the matter is on Hans' list to investigate, but

The VFO/SigGen kit includes, but does not install, R6.? In AppNote6 for the SigGen Set, the additional jumper is shown running from R6 to pad W0. Just to verify: when used as part of the SigGen set,

I just read the topic that his message originally was meant for.? I have a learning question.? What do the jumpers at W0-W1 and W2-W3 physically do on the board? I am currently using the U3S

Yep, could be that indeed Alan.? Also I should note that I was using an unmodified Rev2 board, so the PA instability issue might have had some hand in this as well. 73, ? Bob

Martin is right: You first must confirm (enter) the seleted RIT with the left button, then you can leave the function with the right button and the RX offset will stay. The term "RIT" is a bit

If you just want a low cost power supply, you can get 3 18650 e-cig batteries and get a 12v supply out of that.? 3s battery packs are a couple bucks, and it should be easy to find chargers and cells

Hi Bruce The changes to the PCB for Rev 4 were inconsequential, there is no separate Rev 4 manual... use the Rev 3 one... My suggestion build the VFO board first and the Synth board, and get

Hi all Just a note to say, if you emailed me but I haven't replied, it is because I'm a bit behind on the emails. It is hard enough to keep up with the email traffic normally. But this week even

I think its acting normal. I have my U3S connected via an ammeter, and honestly the backlight current isn't much if you are on a power supply. I suggest setting it to he visible. Carefully adjust the

Receiving now. Went back over all? settings , found an odd box on groups.io homepage and it said something like messages bouncing [don't remember exact terms used-it's gone now]. Anyway, I checked

Did they get routed to your Spam folder? Jack, W8TEE