[time-nuts] Recommendations for a newbie?

[Said Jackson]

Charles,

Not sure why this is confusing to you, he clearly explains all the differences in the description, and what is shown in the photos is exactly what I received.

The z3805A based units cost more than Z3801As, and the ones with one or two 1pps and 10Mhz outputs cost slightly more.

He upgraded all of them to 58503A firmware and put rubber grommets on the outside, and the units I got have 10811As in them just as shown in the photos. And he has fantastic feedback.

The two recent units I got have 5 dB better phase noise than the Thunderbolts I have seen, especially close-in, and about 3x better ADEV. They come with Satstat.

Not to mention great packaging and ultra fast shipping, and no shipping charge.

If one can afford them, they will outperform a Thunderbolt by far. Also these are units using leaded solder, the Thunderbolt is RoHs, so they will eventually die from tin-whiskering..

And they can be easily run from a battery.

What more can one ask for $550?

Bye,
Said



On Sep 8, 2012, at 10:32, "Charles P. Steinmetz" <charles_steinmetz at lavabit.com> wrote:

> Said wrote (re: eBay 58503As):
> 
>> they work well for me, look brand-new, and came with power supply, rs-232
>> cable, and antenna. I think it's a 5V antenna. The unit had about 37000 on
>> the lifetime.
>> 
>> The seller has close up photos, that's what the units look like. I plugged
>> in the power, ran GPSCon to start an Auto-Survey, and they just worked.
> 
> Looking at the current and completed eBay listings for the 58503As from Hong Kong, I notice that the seller seems to have conversion units based on the Z3801 and on the Z3805, and some that may be factory 58503As.  The listing text for all of them says they have 6-channel receivers.  Some have no PPS outputs, some have one, and some have two.  Some have internal AC power supplies, some have external supplies.  There appear to be at least two different rear-panel layouts.  They are priced from $260 to $999, and it does not seem obvious what justifies the radically different prices (aside from different antennas).  Based on these confusing listings, I'd be very reluctant to count on finding anything specific inside the housing (e.g, a particular OCXO) if I bought one, except possibly the $999 units that may be factory 58503As.
> 
> Best regards,
> 
> Charles
> 
> 
> 
> 
> 
> 
> 
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