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Use the 56pF cap as shown in the table in chapter 3.15 of the instructions. I think the C30 cap value given in the parts list used 30pF since it's used on most bands. It may have been clearer to have

I am using awg 32 for T1.? It will fit fine on the T50-2, but it is extremely hard to keep count with my ancient eyes.? I own a couple of L/C meters, so I am OK with measuring the inductance.? I

One thing I would add to this conversation, the ATMega328 based LCR meters are copies of an open source meter that’s been developed and maintained by a group of electronics hobbyists, the original

Hello, Can anyone please tell me capacitor should I use for C30? I am a little bit confused as on page 7 of the manual rev 1.10 a 30pF is listed but the chapter 3.14 mentiones 56pF. Thanks for your

HI after assembling my QCX 20 I have done the calibration as described in the manual. I easily found the PBF peak with the number at the top of LCD showing 9. I have participated in the IOTA contest

Thanks, Alan, forewarned is forearmed! I have been suplied with some pretty bad items from China, though they are in the minority. Ebay offers some protection, as you can give the supplier a bad

The one I tested https://sites.google.com/site/alan4alan/lc100a_term_on_right 73 Alan G4ZFQ

Alan, Take no notice of Chinese claims. I had one that quoted 1%, it was about -20% for normal values. I have one that did not quote any accuracy, it IS around 1%. The only way to be sure is to have

One handy trick to count the number of turns on a toroidal core is to take a picture of it and print it. Then you can tick them off with a pencil. I’m usually ok to count 30 or so turns without a

The LC 100-A from china claims 1% accuracy for L and C over the important part of its measuring range. Priced at just under ?10 it's not a big risk; I have one on order, but it has not arrived yet.

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