[Elecraft] New xtals

Tue Nov 5 12:43:01 2002

Hi Mike, and all

Thanks for the reply. No, I'm not changing the rf\af gain settings. I've
tried "pushing, wiggling" the xtals but no change.
When listening to the bands, the filters are working nicely but way toooo
much loss on. It appears they have a nice shape but too much insertion loss.
I'm hoping its not a bad xtal. Any other help or ideas?

73
Larry
WA2DGD
K2 #1672
ARCI QRP #11215
NJ-QRP# 395
----- Original Message -----
From: "Mike McCoy" <[email protected]>
To: "Larry - WA2DGD" <[email protected]>
Sent: Tuesday, November 05, 2002 12:34 PM
Subject: Re: [Elecraft] New xtals

> Hmm... that doesn't sound right at all.
>
> I know it sounds stupid, but you are not changing the audio/RF gain when
> switching between filters are you? (Of course not but I had to ask)
>
> Presuming you are not, if Spectrograms amplitude is dropping that much
> something is definately wrong somewhere. If you adjust your gain (via
audio
> gain with RF gain as low as possible) to establish a 'baseline' amplitude
> for spectrogram and change filters you should not be seeing such a large
> drop.
>
> Look here for my spectrogram plots post retrofit of the new xtals. Note I
> arbitrarily chose 40 dB as my 'baseline').
>
> http://home.austin.rr.com/cofr/
>
> Unless I'm seeing things, my plots indicate a couple dB GAIN when
switching
> from FL1 to FL2, 3 & 4.
>
> Remember, only FL1 is switched for OP1 when switching in the SSB filter.
> FL2, FL3 & FL4 will be the same. That is probably why you are seeing the
> similar results with SSB.
>
> While assuming (as you say) you don't have a bad solder joint (I would
> reflow anyway just to be safe) and if this was not the case before
changing
> the xtals I would almost think you may have got a bad CW xtal?
>
> Mike
>
> ----- Original Message -----
> From: "Larry - WA2DGD" <[email protected]>
> To: "Elecraft Reflector" <[email protected]>; "Elecraft Support"
> <[email protected]>
> Sent: Tuesday, November 05, 2002 10:44 AM
> Subject: [Elecraft] 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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