[minima] Re: Does the size of the Crystal Oscillators matter?
- From: gurudatta panda <gurudattabam@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Tue, 11 Mar 2014 20:14:08 +0530
@Joe: That means, there will be lot of relaxation from Crystal Matching in
comparison to BITX?
On Tue, Mar 11, 2014 at 7:37 PM, Joe Rocci <joe@xxxxxxxxxx> wrote:
> The filter bandwidth in this radio is so wide that typical crystal
> variations shouldn't have a significant effect.
> If you want the nicest shape, then:
>
> 1) Buy a batch of 10-15 crystals from the same manufacturer, supplier &
> model. Here in the US, these crystals are available from Digikey and Mouser
> for about $.40/ea., as are higher frequency fundamental mode crystals all
> the way to 50 MHz.
> 2) Build a test oscillator and select the 8 crystals that are closest
> together in frequency. Try to get a set that are within about 150 Hz of
> each other. Absolute frequency isn't so important as frequency match.
> 3) If you want to get the last few percent of performance possible, you
> can Google ways to match crystals for their Q and loss resistance.
>
> The filter in this radio is so wide that only #1 & #2 above are really
> critical. Random crystals will probably function, but the passband shape
> won't be optimum. Low profile crystals should work as long as their series
> loss resistance isn't too high. Even if it is higher, it will mostly affect
> filter loss. In the ones I've looked at, it seems OK.
>
> Joe
> W3JDR
>
>
> ----- Original Message -----
>
> *From:* hcker2000 <hcker2000@xxxxxxxxx>
> *To:* minima@xxxxxxxxxxxxx
> *Sent:* Tuesday, March 11, 2014 9:45 AM
> *Subject:* [minima] Does the size of the Crystal Oscillators matter?
>
> Is it ok to use low profile ones?
>
> --
> Mike "hcker2000" Ashcraft
> http://bigironinteractive.com
>
> <http://www.linkedin.com/in/mikeashcraft>
>
>
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