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Re the activity jumps ,a year or more back I was testing a homebuilt VHF crystal oscillator at home, doing thermal runs and noticed extreme frequency variations over a small temperature range. It was repeatable. The source of crystals I was using then, also showed some severe frequency jumps...
Hi,
I will outline a typical crystal specification I use. Just a note first that I am a radio technician, (to component level) by trade and I also order crystals for personal use. Sometimes I have to work out the crystal specification from measurements on an original crystal, but thats another...
Thats the company.
I dont know if they do SC crystals, but its worth an email.
I havent had any issues, with 20 to 30 overtone crystals ordered at different times for my own use.
Good reliable product, with documentation.
Good communication. No problems
I pay by Telegraphic transfer
I am...
Hi,
The noise on the first plot is a function of Bandwidth settings of the Spec An (470 kHz) and multiplier function (x14) and noise floor of the Oscillator/Multiplier Output.
In high order multiplication, such as with SRD the level of the output can be many dB down and this deterioates the...
Hi,
Looking at **broken link removed** , they seem to state that the crystal should have some capacitive loading specification, to resonate on frequency.
I was under the impression that the crystals were series resonant in that type of circuit, (neglecting any component in series for...
Hi,
In Oscillators where active devices ( eg bfr93 and others) have gain up into the multi - GHz region, there is always the possibility of unwanted oscillations/ parasitics occuring.
I notice in some oscillators (only a few designs) have various extra low value resistors to reduce the...
From my work on VHF crystal oscillators ( Butler two transistor oscillator-amateur radio ones), it pays to look at the possible noise sources in oscillators. I found gains were made by extra decoupling, replacing noise generating resistors by inductors, making the transistors operate in a...
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