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(33107) 100%,
Location: Pittsburgh, Pennsylvania
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Item: 294079092418
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Metrex:Metrex
neat item, first one I have ever seen. untested , rubs on a 9 volt battery not included. Found in just part of a box. has directions. see pictures , says 7 in one instruments. 3.5 inches wide….. marked 1961 . battery not included. inside the rear case has some corrosion residue, but the unit looks fine. must have had a leaky battery. the box is really just part of the box…. no probes included…. again untested by me, as-is, as found, I have never seen another on Ebay or in person. Thanks found this on web: might provide some info…. TeleMatic KC -720B CrysMate Crystal Tester CIRCLE 90 ON FREE INFORMATION CARD AN INSTRUMENT THAT WILL TEST RF CRYSTALS can be very useful. The TeleMatic Co., 2849 Fulton St., Brooklyn, NY 11207 made one quite a while ago. I have used it many times with good results. Now, they have introduced a “bigger and better” model, the CrysMate model KC -720B. It has the same features as the original plus some new ones. It checks crystals for activity, as the older one did. You plug the crystal into the front -panel socket. If it is good, an indicator light tells you so. The new model also has a HI -LO switch. If the crystal is suspected of being low in activity or “weak” and the front -panel HI indicator light comes on, switch to LO. If the light goes out, this crystal should be suspected. The crystal socket has the standard ‘/2 -inch (8 -mm) pin spacing. This will fit the majority of crystals found in color TV, CB, etc. For crystals in larger cases, solder two short pieces of stiff No. 20 wire to two mini -clips and use these to hook it up. Keep the leads as short as possible to hold down the stray capacitance. Many crystals work in a “third overtone” mode. If the crystal under test is one of these, a frequency counter or calibrated radio re- ceiver will read the fundamental, since this has the highest amplitude output. A I5 -MHz third -overtone crystal will read 5 MHz, etc. With an accurately calibrated receiver, you can tune a surprising number of harmonics. We have picked up good usable signals from a 1.0 -MHz crystal as high as the 10th harmonic and, in some cases, even higher. (Keep this handy in your shirt pocket to check the tracking of a short-wave receiver; a beep every 1.0 MHz will tell how well the receiver dial tracks the actual frequency. Other frequencies may be used, of course.) You can use the same setup to find the frequency of unknown crystals. Tune for the strongest and lowest – frequency signal. This will be the fundamental. To put an odd -ball marker frequency on a sweep -alignment curve, just feed the RF output of the CrysMate into the external -marker jack of the sweep generator. Most have this jack, but if yours doesn’t, the signal can be coupled into the IF input with a couple of turns of insulated wire. With the proper crystals, you can calibrate CB or amateur radios for frequency, band – edge, etc. Crystals in the set can be checked against replacements to make sure they are good or bad. In most cases, the CrysMate’s RF output will be high enough to drive a frequency counter. If you’re using the CrysMate as a frequency standard, or making calibration adjustments continued on page 24 Please see all pictures and use zoom feature. Often the pictures describe the item better than words.! Also please see the 10,000+ vintage radio related parts and other great antiques and oddities I listed. Radio’s are Fun ! Just like radio parts ? Click on Electronics in my store to see just the electronics I listed ! I always combine shipping to my best, just order and wait to get the invoice from me. On Global Shipping I cannot combine as that is in Ebay’s hands. Please note : Ebay is starting to collect sales tax as required by law for certain states. Thank you for you order and please follow my store.! New items added daily. Also you can go into my store and pick the category for easy shopping. Best to you and Many Thanks, Mike
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