K2 - grounding of RCVR filter Xtals
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Hi all
My K2 s/n 5361 is coming together nicely, up to now I've encountered no problems whatsoever. I just installed the receiver filter Xtals X7 through X11 and now I've arrived at the point where these Xtals have to be grounded (page 53, last step). The manual states that a special grounding technique is required for the grounding of X7-X11. Instead of soldering a grounding lead to the top of the Xtal housings the manual states that the grounding wires need to be soldered to the sides of the housings. There are 2 grounding pads for each Xtal. My question is: is it absolutely imperative to use 2 grounding leads for each Xtal? I don't see too many problems soldering the leads near the outer edge of the PC board, but the soldering points at the opposite sides of the housings are awfully close to RP4 and RP5... Any suggestions as to how I should go about soldering the grounding leads at those sides of the Xtal housings? Thanks for any advice. 73 de Glenn ON4WIX _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K2 - grounding of RCVR filter Xtals
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Hi
Yes it is important to ground on both sides. Here is how I do it. First make sure the crystals are down all the way on the board. Press on the top and heat the crystals leads to make sure there is no space between the crystal and the board. Turn the RF board bottom side up. Drop a clipped component lead into each of the ground holes. I like to use the leads from the 1n4007 diodes but a resistor or cap lead is OK. The leads should go through and rest on the work bench underneath. Solder all of the leads to the board. Now flip the board over and using a small flat blade screwdriver bend the ground leads at the base of each crystal so the lead is parallel to the side of the case of the crystal and touching. Clip each lead so it extends up about 3/4 of the height of the crystal. Now lay the hot iron on the side of the crystal along the lead and feed a little solder. As soon as it flows quickly lay the iron on the other side of the lead so you get a smooth fillet on both sides of the lead. Do all of the ground leads on one side of the crystals first. Then go back and do the other side after the crystals have cooled. Flip the board back over and trim any excess ground wires flush with the board. You should also clip all of the resistor pack leads near the crystals flush with the board. I know this all sounds like a lot of trouble but I you want to get every last ounce of performance out of you K2 it is necessary. It does make a measurable difference. Don Brown KD5NDB ----- Original Message ----- From: "ON4WIX" <[hidden email]> To: <[hidden email]> Sent: Tuesday, February 28, 2006 2:27 PM Subject: [Elecraft] K2 - grounding of RCVR filter Xtals Hi all My K2 s/n 5361 is coming together nicely, up to now I've encountered no problems whatsoever. I just installed the receiver filter Xtals X7 through X11 and now I've arrived at the point where these Xtals have to be grounded (page 53, last step). The manual states that a special grounding technique is required for the grounding of X7-X11. Instead of soldering a grounding lead to the top of the Xtal housings the manual states that the grounding wires need to be soldered to the sides of the housings. There are 2 grounding pads for each Xtal. My question is: is it absolutely imperative to use 2 grounding leads for each Xtal? I don't see too many problems soldering the leads near the outer edge of the PC board, but the soldering points at the opposite sides of the housings are awfully close to RP4 and RP5... Any suggestions as to how I should go about soldering the grounding leads at those sides of the Xtal housings? Thanks for any advice. 73 de Glenn ON4WIX _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: K2 - grounding of RCVR filter Xtals
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In reply to this post by ON4WIX
Glenn,
Tilt the board at about a 45 degree angle so gravity will help solder flow, and more importantly, so you can see what you are doing. Use a large flat area of your soldering tip on the side of the crystals to provide a better heat path and heat until the crystal case itself melts the solder. I use an 800 degree F. iron to accomplish the soldering in about 3 seconds. Yes, solder the xtals on both sides and as low on the xtal sides as you can manage - it provides a lower impedance path to ground resulting in a filter with a smoother shape and better stopband attenuation. 73, Don W3FPR > -----Original Message----- > > My K2 s/n 5361 is coming together nicely, up to now I've > encountered no problems whatsoever. > I just installed the receiver filter Xtals X7 through X11 and now > I've arrived at the point where these Xtals have to be grounded > (page 53, last step). > The manual states that a special grounding technique is required > for the grounding of X7-X11. Instead of soldering a grounding > lead to the top of the Xtal housings the manual states that the > grounding wires need to be soldered to the sides of the housings. > There are 2 grounding pads for each Xtal. My question is: is it > absolutely imperative to use 2 grounding leads for each Xtal? I > don't see too many problems soldering the leads near the outer > edge of the PC board, but the soldering points at the opposite > sides of the housings are awfully close to RP4 and RP5... > Any suggestions as to how I should go about soldering the > grounding leads at those sides of the Xtal housings? > > Thanks for any advice. > > 73 de Glenn ON4WIX > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: K2 - grounding of RCVR filter Xtals
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I prefer to pre-tin the crystal cans before installing the crystals. That
way I can concentrate on doing one thing at a time. Like Don, I use about an 800F iron with a flat tip. Once there's a thin area of solder on the can where I'll want to put the ground wire, it's much easier and faster to solder the wires concentrating on getting the wires positioned and avoiding touching things with the iron that I don't want melted <G>. (Sure I can multitask! I can screw up any number of things at once!) Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K2 - grounding of RCVR filter Xtals
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In reply to this post by ON4WIX
Hi Glenn,
I was at the same point 2 days ago. It was really not a big deal to solder this crystals. I made a couple of pictures that you can find here : http://martinrath.info/wp-gallery2.php?g2_view=core.ShowItem&g2_itemId=562 http://martinrath.info/wp-gallery2.php?g2_view=core.ShowItem&g2_itemId=565 Don has explained the best way of doing. Don't worry about R5/R6 you wont hit them ! 73's Martin F4UKP / DD4UKP _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K2 - grounding of RCVR filter Xtals
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In reply to this post by ON4WIX
Hi Glenn. Here is the approach I used and it worked fine for me. I held each
xtal in one of those extra hands devices that has several alligator clips on it. Then I put the ground wire in the other alligator clip and positioned it so the wire is on the side of the xtal then solder. I did it this way on the side of each xtal so when I put it on the board all I had to do was solder the four leads on the board and trim. The alligator clip serves as a nice little heat sink too. Harvey KN6VP ----- Original Message ----- From: "ON4WIX" <[hidden email]> To: <[hidden email]> Sent: Tuesday, February 28, 2006 12:27 PM Subject: [Elecraft] K2 - grounding of RCVR filter Xtals Hi all My K2 s/n 5361 is coming together nicely, up to now I've encountered no problems whatsoever. I just installed the receiver filter Xtals X7 through X11 and now I've arrived at the point where these Xtals have to be grounded (page 53, last step). The manual states that a special grounding technique is required for the grounding of X7-X11. Instead of soldering a grounding lead to the top of the Xtal housings the manual states that the grounding wires need to be soldered to the sides of the housings. There are 2 grounding pads for each Xtal. My question is: is it absolutely imperative to use 2 grounding leads for each Xtal? I don't see too many problems soldering the leads near the outer edge of the PC board, but the soldering points at the opposite sides of the housings are awfully close to RP4 and RP5... Any suggestions as to how I should go about soldering the grounding leads at those sides of the Xtal housings? Thanks for any advice. 73 de Glenn ON4WIX _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.1/271 - Release Date: 2/28/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.1/271 - Release Date: 2/28/2006 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: K2 - grounding of RCVR filter Xtals
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I turned the board on edge and inserted the ground leads through the
board from the back side. I then clamped the end with a pair of locking jeweler's tweezers and just let the tweezers hang down the side of the board. This made it easy to solder the lead. I then trimmed the lead and used a dental pick to form it appropriately along the side of the crystal. On 2/28/06, Harvey Howell <[hidden email]> wrote: > Hi Glenn. Here is the approach I used and it worked fine for me. I held each > xtal in one of those extra hands devices that has several alligator clips on > it. Then I put the ground wire in the other alligator clip and positioned it > so the wire is on the side of the xtal then solder. I did it this way on the > side of each xtal so when I put it on the board all I had to do was solder > the four leads on the board and trim. The alligator clip serves as a nice > little heat sink too. > > Harvey > KN6VP > ----- Original Message ----- > From: "ON4WIX" <[hidden email]> > To: <[hidden email]> > Sent: Tuesday, February 28, 2006 12:27 PM > Subject: [Elecraft] K2 - grounding of RCVR filter Xtals > > > Hi all > > My K2 s/n 5361 is coming together nicely, up to now I've encountered no > problems whatsoever. > I just installed the receiver filter Xtals X7 through X11 and now I've > arrived at the point where these Xtals have to be grounded (page 53, last > step). > The manual states that a special grounding technique is required for the > grounding of X7-X11. Instead of soldering a grounding lead to the top of the > Xtal housings the manual states that the grounding wires need to be soldered > to the sides of the housings. > There are 2 grounding pads for each Xtal. My question is: is it absolutely > imperative to use 2 grounding leads for each Xtal? I don't see too many > problems soldering the leads near the outer edge of the PC board, but the > soldering points at the opposite sides of the housings are awfully close to > RP4 and RP5... > Any suggestions as to how I should go about soldering the grounding leads at > those sides of the Xtal housings? > > Thanks for any advice. > > 73 de Glenn ON4WIX > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 268.1.1/271 - Release Date: 2/28/2006 > > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 268.1.1/271 - Release Date: 2/28/2006 > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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