The Z3815A has the famous hockey puck OCXO designed by Rick Karlquist.
I have one Z3815A from the seller you mention: it works but, inside,
there was heavy rust on the Furuno GPS receiver case. The old Furuno
receiver in the Z3815A has the GPS week rollover bug as all the
surplus Z-series HP
On 11 Feb 2016 08:05, "Joseph Gray" wrote:
> The less expensive Z3805A's look like they have been beat to crap,
> before or after being pulled from the scrap pile. I'd worry about
> damage to the OCXO in these. For more money, yixunhk has some nicely
> packaged units and AFAIK