I have several 10811.
Pin 6 on the edge connector is EFC input, Pins 2, 4 and 5 are GND.
The HP Service Manual is out there on the web. It's worth a search.
One of my units spent several years on the shelf. I put it back in service
using a
Motorola UT+ GPS receiver and Brooks Shera regulator
I have found two HP10811s where the EFC did not work.
When I opened them if found a teflon insulated silver plated tubular rivet
with the resistor, varicap diode and the lead from the crystal threaded
through the hole, but they had not been soldered.
A touch of resin cored solder to the point and
Hi Perry, I worked in the HP frequency counter section in the 1980's
when the 5335A was developed. I was the project manager for the
5334B counter. Basically, no counter that we ever made AFAIK had
any provision for EFC. The basic concept is that you can get the
frequency close enough with the
Yo Bubba Dudes!,
I bought a HP 10811 from ebay for $36 and shipping.
I installed it in my HP 5335a counter. After running continuously for about 90
days it was down to about 4 to 6 parts in -10. I couldn't adjust it for
better accuracy as HP in their infinite and inscrutable wisdom provided a
Hi All,
Has there been any advances on the failing chips (5088-7061/5088-7062) on
the 5370B?
Jim
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Chris,
I'll post photos of my Trak 8810 if it will help with your restoration.
Yes, it contains a Magnivox MX 4200 OEM GPS receiver with serial
interface and 1PPS via SMA connector.
I fired up the 8810 for the first time since maybe the late 1990's and
after about 20 minutes it's tracking 6
