[R-390] Crystal resurrection

[Mark Richards]

Good point.

I measured at the output connector of the oscillator into a high 
impedance frequency counter with 10db attenuator.

Y401 (1 and 17MHz) yields 20.9804 MHz
Y413 (16 MHz) yields 18.9964 MHz

Measuring all the crystals, I find that the oscillator output frequency 
trends 1 or 2 KHz low.  But the 20Khz difference of Y401 seems to have 
no impact on performance.  Measurement to follow will tell more.

If it's awful, I will try to remove excess solder and tinker a bit with 
the mount...

Question: might corroded solder joints in the case account for weaker 
crystal output from some?  I was about to tinker with changing out mica 
capacitors, but it looks to be an awful job in tight spaces with great 
risk of damaging more than might be fixed.

/m

On 03/19/2014 13:57, Glenn Little wrote:
> At what frequency does the repaired crystal oscillate.
> I would suspect is lower than intended because of the additional mass 
> added to the crystal.
> The original crystal was probably sealed in an inert atmosphere.
>
> I hope that you now have a fully functional crystal.