Check your parts boxes - crystal needed

[N8YX]

For those that are completely stupid (ME) as to what you are talking about, could you post a picture? I have a bunch of old crap around here. Would this crystal only be in a radio?

Here's a size reference:

CR1.jpg

The -18 can either have wire leads or pins.

Can you adapt a SMT xtal? If so, Digikey has some for a couple of bucks.

I noticed the Digikey and Mouser carry devices of the required frequency, but the load capacitance (10pF series) is wrong. Needs to be on the order of 25-32pF parallel.

12.900? Will it work?

Unfortunately, no. The 12.800MHz oscillator is divided down by a series of 7493 counters to get a 2.5Hz gating frequency; if the gating window is longer or shorter than this by even a small amount then the counter isn't accurate. The trimmer circuit as designed won't allow a 12.900MHz rock to be pulled enough to work.