++++++++++++++++++ See also Crystal Grounding ++++++++++++++++++ Date: Sat, 16 Mar 2002 16:12:20 -0500 From: "Mike Yetsko" To: , "Low Power Amateur Radio Discussion" Subject: [122265] Re: where can I find? While you can get actual sheets for this, the suggestion of tape is a good one. If it was a 'one-time' deal, you can cut it and stick to the xtal, but if you're doing a lot, then I'd put it on the board and 'poke' the xtal leads through it. Regular tape would work, but you can get 'packing tape' that is MUCH tougher than regular tape. This might be recommended when you have something like a surface mount cap 'right there' too close to the xtal and you're afraid that if the xtal gets bumped it might bend over a bit and pop through regular tape. Mike ----- Original Message ----- From: "Bruce Rattray" > > I'm looking for a small amount of very thin mylar or teflon to put > underneath crystals so as to avoid the shorting problem...having a heck of > a time trying to find some locally...maybe I'm not asking the right > people...any ideas from anyone please?...thank you... > > ..72/73 - Bruce (VE5RC+VE5QRP) QRP-C#1 QRP-L#886 ARCI#9683 Zombie#272 +++++++++++++++++ Date: Sat, 16 Mar 2002 16:15:32 -0500 From: "Ed Tanton" To: "'Low Power Amateur Radio Discussion'" Subject: [122266] RE: where can I find? Hi Mike... I expect that Bruce is talking about the metal case of the crystal shorting pc board runs underneath it. 73 Ed Tanton N4XY Ed Tanton N4XY 189 Pioneer Trail Marietta, GA 30068-3466 website: http://www.n4xy.com LM: ARRL QCWA AMSAT & INDEXA; SEDXC NCDXA GACW QRP-ARCI OK-QRP QRP-L #758 K2 (FT) #00057 +++++++++++++++++ Date: Sat, 16 Mar 2002 21:46:55 +0000 From: Arthur Moe To: rattray at gpfn.sk.ca Cc: Low Power Amateur Radio Discussion Subject: [122269] Re: where can I find? Bruce and all, Try here http://www.mcmaster.com/ Art KB7WW Bruce Rattray wrote: > > I'm looking for a small amount of very thin mylar or teflon to put > underneath crystals so as to avoid the shorting problem...having a heck of > a time trying to find some locally...maybe I'm not asking the right > people...any ideas from anyone please?...thank you... > > ..72/73 - Bruce (VE5RC+VE5QRP) QRP-C#1 QRP-L#886 ARCI#9683 Zombie#272 > A-1 Operator Club - 10/10# 944 - QRP Borg#1 - Whiner#10 - > - VE5QRP SOC#11 - VE5RC SOC#12 - oo#148 - K2#2032 - COG#15 - > "QRP! How sweet it is!" "I am da man wit "DAH" paddle!" +++++++++++++++ Date: Sat, 16 Mar 2002 16:49:46 -0500 From: wb4mnf To: rattray at gpfn.sk.ca Cc: Low Power Amateur Radio Discussion Subject: [122271] Re: where can I find? Bruce- Get your butt over to the local hardware store. In the plumbing department you'll find these nifty rolls of teflon tape. It has no adhesive. It's just a long strip of thin Teflon and comes in a couple of different widths. Plumbers, and guys like me who live in old houses and so can't afford plumbers use it all the time. It makes threaded pipes go together, 'O'so easily. -bob WB4MNF Bruce Rattray wrote: > I'm looking for a small amount of very thin mylar or teflon to put -- snip -- +++++++++++++++++ Date: Sat, 16 Mar 2002 20:01:47 EST From: K5BDZ at aol.com To: rattray at gpfn.sk.ca, qrp-l at lehigh.edu Subject: [122285] Re: where can I find? In a message dated 03/16/2002 2:00:51 PM Central Standard Time, rattray at gpfn.sk.ca writes: > I'm looking for a small amount of very thin mylar or teflon to put > underneath crystals so as to avoid the shorting problem. Would fiberglass tape work as well? Bill K5BDZ +++++++++++++++++++ Date: Sat, 16 Mar 2002 19:35:53 -0500 From: "Jim Kortge, K8IQY" To: rattray at gpfn.sk.ca Cc: qrp-l at lehigh.edu Subject: [122303] Re: where can I find? At 02:00 PM 3/16/02 -0600, you wrote: >I'm looking for a small amount of very thin mylar or teflon to put >underneath crystals so as to avoid the shorting problem...having a heck of >a time trying to find some locally...maybe I'm not asking the right >people...any ideas from anyone please?...thank you... > >..72/73 - Bruce (VE5RC+VE5QRP) QRP-C#1 QRP-L#886 ARCI#9683 Zombie#272 > A-1 Operator Club - 10/10# 944 - QRP Borg#1 - Whiner#10 - > - VE5QRP SOC#11 - VE5RC SOC#12 - oo#148 - K2#2032 - COG#15 - > "QRP! How sweet it is!" "I am da man wit "DAH" paddle!" Bruce, Go to a drafting supply house and ask for some mylar drafting film. I use it all the time for that purpose. 72, Jim, K8IQY +++++++++++++++++ From: "Lyle Johnson" To: "Elecraft" Subject: RE: [Elecraft] Removing Crystals Date: Tue, 5 Nov 2002 12:26:19 -0800 Hello Steve! > I wonder what most are using to remove the old crystals? Most > components you can cut out on the top and then use a solder > pullit or solder wik (I prefer solder wik) unfortunately the > crystals cannot be cut off, like a resistor or cap. The most important thing is to preserve the PC board - so plan to sacrifice the old crystal. I have used solder wick for this. Just use the right temp on the iron (700 degrees F is fine, but NOT 800!). Once you have the solder removed from the hole, clip the ground lead and see if the crystal comes out. If it does, proceed to the next one :-) If it doesn't, heat one of the two pins and push the crystal away from the heated pin. Then repeat from the other side on the other pin, back and forth, rocking the crystal until it comes free. +-----+ <-- push here | | | | | | +-----+ Crystal ========|===|=== PCB \<---- heat here If you keep the iron temperature low enough (and high enough!), and don't apply heat too long, you'll preserve the board and the crystal will come out easily. If you use too much pressure and not enough heat, the lead may pull out the plate-through in the PCB or lift a pad. If you use too high a temperature, you're likely to lift a pad. Neither problem is unrepairable, but both are avoidable. 73, Lyle KK7P +++++++++++++++ From: "Bob - AG5Q" To: "Bruce D. McLaughlin" , Subject: Re: [Elecraft] Grounding crystal filters Date: Fri, 14 Mar 2003 17:34:01 -0600 Hi Bruce, You can do it before or after putting the xtals on the board. Perhaps easiest is to put the wires in the holes on either side of the xtal and solder them first and tin the upper end of the wires. Bend the wires so the xtal can be easily inserted. It may be easier to tin the sides of the xtal before putting it on the board, depending on the surrounding components. One tool I've found handy for holding small parts for soldering is to put a rubber band around the handles of regular pliers. This makes a nice little vise and you can adjust the holding force by winding the rubber band around the handles. After putting the xtal on the board, bend the leads into position and solder them quickly. The alternative is to put the leads on the xtal first, but then you have to wiggle four leads into position at the same time. If the xtal is close to a tall component, you may have to do it this way. 73/ Bob - AG5Q ----- Original Message ----- From: "Bruce D. McLaughlin" To: Sent: Friday, March 14, 2003 5:06 PM Subject: [Elecraft] Grounding crystal filters > Does anyone have a good suggestion or two as to how best to handle the > crystal grounding? > Bruce - W8FU ++++++++++++++++++