Small world David, I was in Costa Mesa (3 miles from Santa Ana, still have a house there) and converted an OLD Motorola 80D Edison radio (1950's?) to a 2 channel 2M ham radio for repeater access. Johnstone Peak (.22-.82) 146??? Then .94 simplex to talk to my lifetime ham buddy. I heard of Cal Crystal, but allways read that Int Crystal was the "hams" friend. I still have this radio out side there waiting to go to the dump! Crystals and Crystal Ovens too! I was run with a dynamotor or vibrator off 6V? I put a TV power transformer in it for 110VAC. I weights about 50 Lbs! Mike, WA6ISP ----- Original Message ----- From: "David VanHorn" To: "Microcontroller discussion list - Public." Sent: Sunday, January 08, 2006 8:42 AM Subject: Re: [EE] Crystal capacitance > On 1/8/06, Mike Hagen wrote: >> >> Many moons ago I used International Crystal in Ok. for ham radio >> crystals. >> They have a pretty good website and used to be real helpful on the phone? >> They made me several crystals at nearly $15 each 30 years ago! Ouch! > > > Cal Crystal Labs made me some one afternoon. Talk about rush, I was in > Santa > Ana at the time, and before I could drive up there, they had them built. > No > guarantees on aging though, but that was a given. At the moment I'm using > West in BC Canada, because they know how to make the crystals for the > Daniels repeater gear that I'm putting on the air here. > > Basically, when you're specifying things (rather than selecting a crystal) > the tradeoff in shunt capacitance is stability and startup time. Lighter > cap values start faster, but also are more subject to variability. The > parasitic value in your circuit isn't something you can control all that > well, so the larger C values make that number less important. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist