[Elecraft] Re: WA2DGD: RE: New xtals

Tue Nov 5 14:50:01 2002

The Elecraft instructions I have say to ground the crystals at the TOP
of the cans using a wire, NOT at the bottom. As I understand it, the
reason for that is to avoid damaging a crystal with heat from soldering.

The suggestion to ground the cans at the bottom anyway came from some
ops who wanted to improve the ultimate stop-band attenuation of the
filter.

 Most of them (and me most of the time) got away with soldering to the
bottom of the cans, but I've fried some crystals that way and soldered
my K2 crystals at the top like Elecraft recommends. 

I hate to mention it, but you mentioned "I grounded the xtals at the
bottom on both sides (just like the original xtals)."  Perhaps you
cooked a crystal this time? 

By the way: Does everyone realize that if you hit "reply to all" Gary
Surrency is getting copied on all of these messages! (Not this one - I
took it out).

It's NOT NICE to cc [email protected] or gary with board chatter,
from what I understand. 

Ron AC7AC
K2 # 1289
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Larry - WA2DGD
Sent: Tuesday, November 05, 2002 10:28 AM
To: Elecraft Reflector; Gary Surrency
Subject: [Elecraft] Re: WA2DGD: RE: New xtals

Hi Gary,

Thanks for the reply. Keep in mind this is a fully functioning K2 with
the old xtals. I removed the SSB module and shorted the appropriate
pins. Now the CW filters work great, no attenuation and a great shape.
CW and CW rev look and sound excellent. I was easily able to run
spectrogram. I put the SSB module back in and.....everything works
great...go figure. Maybe I didn't have the SSB module seated well.
Thanks for all the help. 73 Larry WA2DGD K2 #1672 ARCI QRP #11215
NJ-QRP# 395

----- Original Message -----
From: "Gary Surrency" <[email protected]>
To: "'Larry - WA2DGD'" <[email protected]>
Cc: "CSinfo (E-mail)" <[email protected]>
Sent: Tuesday, November 05, 2002 12:43 PM
Subject: WA2DGD: RE: New xtals

> What filter is FL2-FL4 set to? These are often the CW variable filter 
> on
the
> RF PCB, and not the OP1 fixed filter on the SSB option.
>
> If this is the case, then you may have a problem with the CW variable 
> filter, or the PIN diode switching on the SSB option that selects 
> either filter.
>
> It could also be just a poor alignment on the CW variable filter too. 
> When CAL FIL BFO settings are correct, there is only a 3-6dB loss at 
> the
narrower
> CW filter bandwidths.
>
> Be sure the T1, T2, RFC1, RFC2 toroids on the KSB2 option are 
> correctly built and installed, and there are no poorly tinned toroid 
> leads or short circuits in those areas. A close inspection of the SSB 
> option should show
if
> there is a problem.
>
> Place jumper wires in the 3 pin connectors, and a .001uF cap across P1
pins
> 7 & 12. See if the rig then works normally, and if you can get CAL FIL
done
> well for the CW filter.
>
> --
> 73, Gary AB7MY
> =========
> [email protected]
> Elecraft Technical Support
>
> -----Original Message-----
> From: Larry - WA2DGD [mailto:[email protected]]
> Sent: Tuesday, November 05, 2002 9:44 AM
> To: Elecraft Reflector; Elecraft Support
> Subject: New xtals
>
>
> Hello all,
>
> I just finished replacing xtals X5 - X11 and the 7 xtals on the ssb 
> board. I'm trying to use Spectrogram and the noise generator to 
> realign the
filters
> (cal fil). I'm finding that FL2 and FL3 are down at least 20db and FL4

> is down over 30db compared to FL1. I get similar results on SSB. Am I 
> forgetting to do something else? I've rechecked the xtals under 
> magnification and all connections are fine, no shorts, etc. I grounded

> the xtals at the bottom on both sides (just
like
> the original xtals).
> What's happening here? Your help will be greatly appreciated. 73
> Larry
> WA2DGD
> K2 #1672
> ARCI QRP #11215
> NJ-QRP# 395
>
>
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