[time-nuts] Hp Family GPS DOs vs. Tbolts Rev 3 SW and Trimble VCXO

Bob Camp kb8tq at n1k.org
Sun Nov 30 20:02:51 EST 2014


As has been mentioned, there are a variety of HP boxes, each with their own pluses and minuses. Compared to a T Bolt:

1) They all are bigger

2) They all pull more power

3) None of them work with Lady Heather (which is a big deal to me)

4) None of them have coefficients you can modify

5) Some of the outputs on the HP’s are (much) better for spurs than the T Bolt’s output.

6) The phase noise on the T Bolt is better than / at least as good as any of the HP’s (pretty useless on the T Bolt with all the spurs)

7) The ADEV on an un-modified T Bolt is much worse than on an HP. Tuned up the T Bolt can be pretty good.

8) The temperature stability of the 260 series HP’s is better than a T Bolt. The single oven with heater 10811’s are not that great. (either way - pretty much a useless thing when locked to GPS).

9) The GPS in the T Bolt is better than the GPS in the HP’s. That’s not of much use, but it’s a better GPS.

I’d get a couple of KS’s while they are out there …


> On Nov 30, 2014, at 6:42 PM, johncroos via time-nuts <time-nuts at febo.com> wrote:
> With all of the discussion of the recent availability of various HP family
> GPS DO devices, I was wondering if I should get a couple. Presently I have
> a couple of T-bolts that seem to serve me well. What wold be the advantages
> gained by going to the HPs. Need 10 MHz output though. Any thoughts?
> -73 john roos k6iql
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