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WTB: FT-243 3885 KHz Crystal
Wanted FT-243 3885 KHz crystal
Thanks for reading --------------- HAMGUY |
WTB: FT-243 3885 KHz Crystal
HAMGUY wrote:
Wanted FT-243 3885 KHz crystal Thanks for reading --------------- HAMGUY If you can find one of the original military test frequency crystals for 3885, that's fine. If not, I can recommend MH Crystals in Rancho Cucamonga, CA. I've tried some of those miniature xtals stuffed inside FT-243's and found that some kind of work, others don't. Also, its almost impossible to use oscillator keying when you use them as they whoop and stumble into oscillation (IF they oscillate, at all). MH uses a large blank crystal in an HC-6 holder with FT-243 pins. I use them in the BC-669, etc. which have high crystal current. They do just fine. The cost is about $14 each. Just ask for the standard FT-243 spec with 32pf capacitance. -- Posted Via Newsfeeds.com Premium Usenet Newsgroup Service ---------------------------------------------------------- http://www.Newsfeeds.com |
WTB: FT-243 3885 KHz Crystal
Or, grind your own. Simple and rewarding. Find an old novice crystal and
start grinding. Any of the old Handbooks will give you all the information you need. I have used sandpaper and had good results, when nothing better is handy. You can also etch with chemicals - same stuff that is used to etch glass. Always better to roll your own. 73, Colin K7FM |
WTB: FT-243 3885 KHz Crystal
I second K3HVG's assessment. MH is excellent.
Also, don't rule out grinding your own. I tried it as a novice in the 60s and it never worked. Last winter I started playing around again with some old FT-243s. Put a few drops of water on a piece of 0000 grit emery or sandpaper laying on top of the glass from an old picture frame and, voila, it actually worked! I've reground about 7 crystals successfully now. Very satisfying. But be sure to use the technique described in an older publication like Bill Orr's Radio Handbook or even one of the EARLY Newington books. Good luck. WA9VLK "k3hvg" wrote in message ... HAMGUY wrote: Wanted FT-243 3885 KHz crystal Thanks for reading --------------- HAMGUY If you can find one of the original military test frequency crystals for 3885, that's fine. If not, I can recommend MH Crystals in Rancho Cucamonga, CA. I've tried some of those miniature xtals stuffed inside FT-243's and found that some kind of work, others don't. Also, its almost impossible to use oscillator keying when you use them as they whoop and stumble into oscillation (IF they oscillate, at all). MH uses a large blank crystal in an HC-6 holder with FT-243 pins. I use them in the BC-669, etc. which have high crystal current. They do just fine. The cost is about $14 each. Just ask for the standard FT-243 spec with 32pf capacitance. -- Posted Via Newsfeeds.com Premium Usenet Newsgroup Service ---------------------------------------------------------- http://www.Newsfeeds.com |
WTB: FT-243 3885 KHz Crystal
Smokey wrote:
I second K3HVG's assessment. MH is excellent. Also, don't rule out grinding your own. I tried it as a novice in the 60s and it never worked. Last winter I started playing around again with some old FT-243s. Put a few drops of water on a piece of 0000 grit emery or sandpaper laying on top of the glass from an old picture frame and, voila, it actually worked! I've reground about 7 crystals successfully now. Very satisfying. But be sure to use the technique described in an older publication like Bill Orr's Radio Handbook or even one of the EARLY Newington books. Good luck. WA9VLK I just finished the somewhat pricey book "Crystal Clear", a tome about the crystal industry and the Signal Corps in WWII. Its incredibly interesting and illuminating. I now know why I had a difficult time with home-brew crystal grinding! The thing is, I recently have seen write-ups about the same subject, with recommendations and methods wholly debunked by Army and crystal industry way back in 1943. Too bad this book is so expensive. I'll have to check out Orr's handbook and see what he said. I have a couple of DC-35's to bring up a bit.... Where is Leo Meyerson when you need him? (Hi!!!) de K3HVG -- Posted Via Newsfeeds.com Premium Usenet Newsgroup Service ---------------------------------------------------------- http://www.Newsfeeds.com |
WTB: FT-243 3885 KHz Crystal
Toothpaste used to work too...
On Mon, 17 Nov 2008 09:08:33 -0600, "Smokey" wrote: I second K3HVG's assessment. MH is excellent. Also, don't rule out grinding your own. I tried it as a novice in the 60s and it never worked. Last winter I started playing around again with some old FT-243s. Put a few drops of water on a piece of 0000 grit emery or sandpaper laying on top of the glass from an old picture frame and, voila, it actually worked! I've reground about 7 crystals successfully now. Very satisfying. But be sure to use the technique described in an older publication like Bill Orr's Radio Handbook or even one of the EARLY Newington books. Good luck. WA9VLK "k3hvg" wrote in message ... HAMGUY wrote: Wanted FT-243 3885 KHz crystal Thanks for reading --------------- HAMGUY If you can find one of the original military test frequency crystals for 3885, that's fine. If not, I can recommend MH Crystals in Rancho Cucamonga, CA. I've tried some of those miniature xtals stuffed inside FT-243's and found that some kind of work, others don't. Also, its almost impossible to use oscillator keying when you use them as they whoop and stumble into oscillation (IF they oscillate, at all). MH uses a large blank crystal in an HC-6 holder with FT-243 pins. I use them in the BC-669, etc. which have high crystal current. They do just fine. The cost is about $14 each. Just ask for the standard FT-243 spec with 32pf capacitance. -- Posted Via Newsfeeds.com Premium Usenet Newsgroup Service ---------------------------------------------------------- http://www.Newsfeeds.com |
WTB: FT-243 3885 KHz Crystal
Jim wrote:
Toothpaste used to work too... Takes forever, though. Ajax cleanser is faster, then you can use toothpaste to fine-tune it. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
WTB: FT-243 3885 KHz Crystal
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