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Hi Mike, as we started the project in 2017 all PCBs are made 2018/19. They all have plated through holes! The vari caps (C54) are also made by the original manufacturer in 2018. So don't worry... give

Thanks Stefan - that's pretty amazing. Does "...industry quality pcbs ..." mean Industry Quality from the mid 90s where sometimes, plated through holes were not a thing? Not being critical, just

Hi gents, I have posted the detailed information in a new thread. /g/qrp-tech/topic/25_years_of_the_sierra/32456807?p=,,,50,0,0,0::recentpostdate%2Fsticky,,,50,2,0,32456807 72/3 de

HAPPY BIRTHDAY SIERRA! Hi all, with permission of Wayne Burdick, N6KR, OM Dirk, DH4YM and me - sTef DM5TU / VY1QRP are able to provide industry quality pcbs for your SIERRA project build. The SIERRA

VXOs, the ability to vary the rock is directly tied to the fixed C (holder and crystal) and can be expressed by PPM so naturally higher you go the more you can pull a rock expressed in Khz. The big

Chuck is correct. I did all the matching of crystals for all NorCal kits.

One of the purposes of experimenting with various IF frequencies and as a side project was to measure the pulling ability of -U vs -S as a function of the frequency as the crystal frequencies chosen

Chuck, I for one will be interested in the results. I used the HC-49S for my Norcal 40a and it seems to work well, but I keep wondering if it would work even better with HC-49U crystals. One thing I

At the same link, in the upper right side of the web page, you can get 50 pcs 10.245 MHz, 9 MHz, 10 MHz for $7.50 and for $13.58, you can get 100 pcs of 9 MHz in HC-49U! -Steve K1RF

My 6M DDB phasing rig uses a 14mhz VFO. IF one uses good NPO and N750 caps and tested it can be remarkably stable. Allison -- Please reply on the group, no private emails we as a group share info that

Oooops.? Typo.? I'm the one with OCD problems, not Diz. chuck, k7qo

I apologize for the rash of postings. Here is a quick list of URLs to see some online material on crystals and matching methodology. https://www.qsl.net/w0pwe/HB/Xtal_Osc.html

If one takes extra care in using NP0 parts where specified and using the -7 ferrite core you should not have any problems.? There are a large number of designs that use 4MHz and higher local

Hi Chuck, will raising the frequency of the VFO alter it's stability? I'm super impressed with the norcal I built's vfo stability and I read somewhere that the lower frequency vfo's are more temp

The original requirement was matched within 25Hz. Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"

I have 50 pcs of 4.915MHz HC-49 crystals on my Mouser order for next month. I'm going to build a test setup (oscillator/counter) to try matching crystals. We will see how that works. There are other

Hi Chuck I ordered 10 xtals a week ago they are on a slow boat from China. Then I will have to start checking each ones accuracy. How accurate do they need to be for the filter Chuck? Oh and Im in the

In a quick search I found the following. https://tinyurl.com/y3s9uunu 50pcs 4.9152MHz HC-49U crystals for $7.20 USD with free shipping to the US. They have 296,991 lots available at the time, but that

I used wet silicon carbide to lap pieces, wet emery works well too. I found that even the smallest gap will indeed lower the effective mu. TV yokes that's ok as it also increases the flux saturation

Am attempting to join multiple complex-shaped ferrite pieces, namely TV-yoke cores. Many of these are split into two halves. In any case, they will be re-wound with copper in a way that will direct