I had the new clock running for about two weeks (new clock uses a temperature compensated crystal), calculated out how much slower it was running, and sped it up ( changing the clocks speed in its software). I have now recorded almost two full weeks after being calibrated, since the calibration, its kept absolutely perfect time. its really appears to be perfect as compared to the reference time that i'm using. I find that amazing.
so I thought that my Sven was really good, it seems to me, its likely going to be around +6 sec / year. but TXCO clock might go less then +2 sec/year. I'll keep recording its time difference and see.
Answer to the question, is the TXCO worth the extra cost.. I think so. I think very accurate clocks are more interesting then less accurate clocks... with that said.. I think Sven is plenty accurate enough for almost anyone and my ITS1 clock seems to be just as accurate, which makes sense, as its similar. I record the same thing for my QTC clock, but I suspect its very similar to the Sven clock. I really appreciate that you can speed up or slow down the clocks via a setting in its software.
I will attach a graph of the new clock when I remember to get it from work (Every morning when I start work, I record the time difference from the reference time on the internet).
Not too surprising to me that the TCXO clock is that accurate. In my experience TCXOs are extremely stable over long periods of time. I share your interest in "super" accuracy so of course I consider them to be worth the money when designing & building for myself. If I was making a product for sale I might not use TCXO since I'd be competing with products that have been engineered to meet a price point rather than engineered and then priced.
Look into it later when the dust is clearing off the crater.
I'm really impressed with TXCO now.. So far I have been running the clock for 1 1/2 months, and it seems to be within 1/10 of a sec. I would guess at this rate its not going to be off more than .2 sec a year.
I honestly can't decide if its any different from the time I'm checking it against.
I had no idea I could make a clock this accurate. at this level of accuracy, I'm not sure that a GPS receiver would help, maybe after a year or so of running it might be a tad closer to perfect time.
I haven't seen much posted, I thought I would give a small update on my TXCO clock.
At 100 days since its been running its now about .25 sec fast. Its really difficult for me to eye exactly how fast it is, but something close to that. that makes it about 3/4 sec - 1 sec fast per year.
I think that is REALLY good.
attached is a small
picture of it on my desk at work, next to a brand new Sven clock that I made as a Christmas present