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I purchased them from wtl crystals in China, but they have a one thousand piece minimum. I am going to offer matched sets of 6 crystals (4 within 10 Hertz) for $1 + $3 postage. I will post here when

Thanks Chuck for everything that you and the group are doing. 16 boards arrived, 5 minutes after unpacking 6 have already been spoken for, they are going to the people who have been given the norcal

I made the attached two plots of the bandpass of the crystal filter. U1 and U2 were removed from my test board. Tracking generator was fed into pins 4&5 of U1 socket and input to spectrum analyzer was

Fellow QRP’s This discussion of filters brings back memories! Back when I was in college, studying chemistry, ( there were only four elements on the periodic table back then), I had a roommate who

Gentlemen, Chuck has done a magnificent job in bringing us a vehicle for learning the fundamentals (per usual) in his securing the NorCal 40A and Colpitts Oscillator boards plus the how-to videos.

All I have added this item to the QRP Labs shop, see http://shop.qrp-labs.com/trimmer Price is $2.50 for a pack of ten of the 30pF trimmers, the same model used in the BPF kit

Hans, I've placed my order and hope I'm first in line to respond with an order.? :-) Have you put them into a VFO to test their temp coefficient? Hopefully you have a datasheet to share with the

Thanks for allowing membership. regards Sarma vu3zmv

I had bought from this guy. 10pcs 1SV149 Variable Capacitance Diode TOSHIBA | eBay | | | | | | | | | | | 10pcs 1SV149 Variable Capacitance Diode TOSHIBA | eBay 10pcs 1SV149 Variable Capacitance Diode

It is a good yield.? What is the brand and can you indicate the seller details.?I am also interest to buy few !!

Hi again all I made inquiries through my supply chain. I can get a few hundred of these 30pF CYMI trimmer capacitors and make them available in the QRP Labs shop https://shop.qrp-labs.com/ price $2.50

I've thought of making another coupler for a half wave antenna. I want to use an air coil and air spaced tuning capacitor. I'm wondering if it's more desirable to use a high inductance and low

Hi all Sorry for the slow answer, I only read the daily-digest version of the group. To be sure, you are right, I get these CYMI for a great price! One big reason why QRP Labs kits are such low cost

I finished the second hundred crystals this evening. I got 21 sets of 4 matched to within 10 Hertz. Using a K7QO Colpits oscillator built by K7QO himself. I have 41 sets out of 200 crystals. I find

Chuck, Like others have indicated. Sprague/Goodman or Vishay. I bought a bunch at Mouser a few years ago. Pricey. The film insulators melt when soldering. Be quick when you solder the tabs. They work

I think Graham is right. They appear to be CYMI caps in looking at the picture again. I think he nailed it. john AD5YE

In looking at a blown-up picture from Hans' site, I notice the trim caps are marked "GVM". There is a GVM Electronics company in Hyderabad, India but I don't know if they are the makers... john AD5YE

Well, the photo has the letters CYMI molded into the top of the caps. Googling CYMI results in: https://wellgainelectronics.com/trimmer-caps/30099-cymi-cwm-13-4-27pf-100v.html --- Graham == wrote:

These are probably Vishay BC caps. They are a copy of some Sprague-Goodman caps, which are no longer generally available, of course. Both Mouser and Digi-Key supply them in the USA. They are not cheap

This may not match exactly, but the lettering on top is the same https://wellgainelectronics.com/trimmer-caps/30099-cymi-cwm-13-4-27pf-100v.html Michael Medley AA1MM