dave s crystal grinding web

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ham electronic homebrewer: FT243 crystal grinding

 · I also tried some crocus cloth. It discolored the crystal and made it quit oscillating until I ground it some more with abrasive compound. Better / faster results - I did some web searches and found Dave''s Crystal Grinding Page, where he documented doing a lot of

Crystal Grinding | Page 5 | QRZ Forums

 · So I''ve been teaching myself the art of grinding crystals! My first efforts have actually been somewhat successful, so long as the deviation isn''t terribly far. Using "junk crystals" (i.e., those that can''t really end up in a ham band) I''ve been successful at grinding them 10 KHz without any trouble, 20 KHz as long as I''m very careful - too much grinding of the crystal center I''ve found, kills them!

Guide to Crystal Grids

All of the grids sold here at the Crystal Vaults come with a very detailed instruction sheet that both explains and illustrates the set up. It also explains the order in which the grid is constructed, and the exact way to use the grid. Every grid has several parts: The Focus Stone, The Way Stones, The Desire Stones, the Path, and the Visual.

Crystal Forms

Paper models for the 32 crystal classes and 7 crystal systems have been reproduced in .pdf format. These models can be printed on heavy card stock to construct a physical model. Please note: the paper model forms may be simplified from the JCrystal forms to avoid overly-complicated cut-outs.

Dave''s Homemade Crystal and Tube Radios at …

Dave, I found your webpage while searching for a formula for determing the number of turns for a given inductance of a spider web coil. The formula on your page is fine but isn''t too practical if you want to build a coil to a specific inductance.

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Dave''s Adventures in Business Intelligence » Calculation …

 · Hi Dave. Yes I understand the projection and that''s what I was getting at I suppose. Without it explicitly being there, I never know whether the SUM function (as defined by your object''s projection) would encompass the In Report within the input or output context i ...

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You have arrived! Over 100 crystal radio sets and tube receivers, and loop antenna projects and plans made by Dave Schmarder are available on makearadio . I encourage all to make a little radio for yourself or build with your kids. Enjoy the dx on a homemade


Then clean off and dry. If you overshoot, a small amount of pencil lead rubbed on the center of the crystal face will either lower the frequency or cause it to fail to oscillate. This takes a light touch and a bit of practice. Avoid grinding the center of the crystal face.

how to grind quartz rocks

 · Dave''s Crystal Grinding Web-Page A good history of Quartz crystals can be found at … one of the favorite materials used by early amateur radio amateurs to grind crystals . » More detailed

How is crystal frequency set?

 · When you purchase a crystal to use as a clock, the company is asking you exact frequency to set it at. I remember needing a crystal that was 4x the NTSC color carrier and they were asking me how many digit precision I needed. What is the process to ''set'' the

Peter''s Pottery: Crystal Glaze Tests

 · The grinding off of crystal glaze runs is not my most favorite occupation, but it is part of the package really! I do the rough part of it with a bench grinder, and finish off with a hand held tool that is more what a model engineer would use (or a mad dentist!!).

Three-Component Carboxylic Acid−Bipyridine Lattice …

Cocrystallization of 1,3,5-cyclohexanetricarboxylic acid with 4,4''-bipyridine bases of different CH2 chain lengths (n = 0, 2, 4) has afforded the ternary host framework [H3CTA·bipy-eta(gauche)·(bipy-bu)0.5] (2), sustained by O−H···N hydrogen bonds. Inclusion of p-dichlorobenzene in the square voids of host 2 provides the first example of a quaternary cocrystal. Crystal structures of ...

Crystal Grinding | Page 3 | QRZ Forums

 · That puts an uneven pressure on the crystal, and as someone else noted that will cause the center to grind faster than the edges, or at least unevenly. The best work around I''ve found is to copy what the jewelers do when grinding stones, and telescope makers do when grinding lenses: use pitch or hard wax to glue the crystal onto a small piece of wood.

dave s crystal grinding web

dave s crystal grinding web FT243 crystal grinding - ham electronic homebrewer 14 Mar 2011 ... I did some web searches and found Dave& 39;s Crystal Grinding Page, where he documented doing a lot of the same stuff I was doing, plus coming... A combination

Powder Using In Crystal Grinding

 · Dave''s Crystal Grinding Web-Page - EarthLink 2006-7-27 The crystal was ground 100 figure-8 laps using the Bartender''s Friend powder. This increased the frequency by 3 KHz (6.949 MHz to 6.952 MHz). The crystal was then ground 100 figure-8 laps using the ...

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crystal grinding FT-243 crystal blanks

 · For the really-really-really fine touch(es), get some jeweller''s rouge. Let''s assume your crystal blank, from the FT-243, is about 25 to 20 kHz BELOW your desired operating frequency. It could be lower than that, and it''s okay - it''ll just require more grinding on your

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Dave''s Adventures in Business Intelligence » Using a …

 · Dave That is one way to use the flexible prompt approach but things look to change in XIR3. WHat I have read and not had a chance to test out on our "sandbox" deployment is the ability to bypass a prompt at execution time. It looks like a feature to let the user ...

[email protected] | AF4K Crystals web store is now …

 · On 4/23/21 4:12 PM, Dave VE3GSO wrote: I think you are assuming that the crystals in FT243 holders will be bare crystal plates, like the war surplus we all loved many decades ago. These "new" crystals are more likely to be in hermetic metal cases …

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N6EV''s Amateur Radio Glowbugs Page

 · FT243 Crystal Grinding Information Compiled by Paul Carreiro, N6EV Bruce, VE3UWL''s Glowbug Bibliography Site Glowbug Bibliography Compiled by Paul Carreiro, N6EV (Last Updated 2-23-97) Glowbugs Digest Archive

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Crystal penning

Ron Brink PA2RF wrote an article on penning crystals for the Dutch amateur radio magasine "Electron", published in the July 2006 issue. Click here to read Ron''s article (in Dutch only). Here''s a 7010kHz crystal I made for my one valve CW transmitter. The crystal was in …

SHAPING A CABOJOHN--101 | Rock Tumbling Hobby | …

Aug 18, 2014 - Shaping a Cabojohn--101. | Rock Tumbling Hobby.

Crystalreceiver .uk – Your Crystal Radio Set …

Geoff Roberts has built many nice crystal radio receivers. Some of these sets have galena detectors. Geoff pays attention to detail with his expert craftsmanship. Geoff specializes crystal sets with machine wound cylinder coils, and great brasswork. Crystal radios

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new xtals for old? | QRZ Forums

 · There''s too much voltage across the crystal, and what we need to do is reduce the grid-resistor value to just above where the circuit''s output peaks (belong which peak oscillation stops). To do this, build the circuit as specified in The Old Days, high-value grid R and all.

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Crystal Gridding Guide – How to Direct Energy and …

 · This process is something everyone can benefit from. Crystal grids works by directing energy towards a particular need. That might be love, prosperity, career success, or another area you feel requires extra attention. If you are ready to manifest your …