[time-nuts] what is acceptable harmonic content & level for a 10Mhz standard?

2016-01-26 Thread walter shawlee 2
I have been working on a compact portable 10Mhz bench standard using both an FE FE5680A Rb oscillator and an Oscilloquartz ovenized crystal oscillator. I was curious to see how their short and long term stability would work out, and I needed something to drive my 6502 amp to pipe the signal to

Re: [time-nuts] what is acceptable harmonic content & level for a 10Mhz standard?

2016-01-26 Thread paul swed
Walter that OCXO sure looks odd I would expect unfiltered to be a lot better then that. I would guess that several possibilities exist. The actual crystal is a 5 MHz and it feeds a doubler. The chain has something thats gone non-linear. -5dbm seems low to me. Oscilloquartz have a very fine

Re: [time-nuts] what is acceptable harmonic content & level for a 10Mhz standard?

2016-01-26 Thread Richard (Rick) Karlquist
On 1/26/2016 11:52 AM, walter shawlee 2 wrote: I have been working on a compact portable 10Mhz bench standard using both an FE FE5680A Rb oscillator and an Oscilloquartz ovenized It is important for a 10 MHz source to launch a pure sine wave and also to have an accurate 50 ohm impedance at

Re: [time-nuts] what is acceptable harmonic content & level for a 10Mhz standard?

2016-01-26 Thread Bob Camp
Hi If your OCXO is putting out less than 0 dbm, it’s broke. Given the way these parts are treated in the salvage loop, damage is not unusual. There are a *lot* of examples of surplus OCXO’s with low output. Normally it’s a damaged output cap or something like it. I’ve seen roughly half the