I want to build an ladder SSB filter using 8 MHz quartz resonators. I don't have frequency meter but I have NWT-70. How can I match crystals to build a good filter? What kind of parameters should I take into account?
One good option here would be to buy and build a crystal tester and frequency counter kit. These are available on eBay for under $20, and take less than two hours to assemble. It's only a 4 digit counter, however, so if you need a closer match than 1 kHz you'll need one with more precision. Still available as a kit, though likely without the direct crystal testing function, and the kit will cost a bit more.
Alternately, if the control software lets you directly control the frequency on that sweep generator, you should be able to spot the amplitude peak when you hit the crystal's frequency; the peak will be a good bit wider than the 1 Hz resolution claimed for the NWT-70, but you if you can sweep a narrow range, you ought to be able to read the peak well enough to at least equal a 4-digit frequency counter, if not get down to a few tens of Hz.