Home Top Page 1



HP 58503A

GPS Time & Frequency

Reference Receiver

w/Datum GPS Reference Timing Antenna


The Hewlett-Packard 58503A GPS receiver provides a primary standard level of time & frequency accuracy in a true Plug-n-Play, portable package that can quickly lock on GPS signals in virtually any location.   All these features combined provide a time base far more versatile then the Cesium standards they were designed to replace.  The HP 58503A generates precise 10MHz and 1pps signals using HP's proprietary SmartClockTM technology utilizing a precision quartz oscillator and incorporates an RS232 port for monitoring and control.

The auction includes several version of software for use with the HP 5805A and manuals for the HP 58503B which is almost identical to the HP 58503A

This is a very late model HP 58503A.  It is the later Agilent grey color.  It's performance is exceptional. It is perhaps the best performing GPS receiver we have ever tested in our lab.   It's physical condition is perfect.



This unit includes a Datum GPS Reference Timing Antenna.  Although this system is Plug-n-Play, many additional features can be accessed through the RS232 port from your computer using the included Operations Software.  Also included on the software CD is the manuals and additional technical information for the 58503B.   The accuracy of this GPS receiver's 10MHz output can be seen in the photos with the 53131A counter disciplined to our Cesium standard.

This setup demonstrates not only the receivers accuracy but exceptional sensitivity since the lab and antenna are on a sub floor of our building (below ground) and still provided an excellent GPS lock. 



58503A Performance Characteristics
Form Factor: Benchtop
Type: Quartz/GPS
GPS Receiver: 6-Channel Parallel Tracking
Frequency: 10 MHz      1pps
10 MHz Output Characteristics < 1x10-12  Locked
Hold Over Aging: < 1x10-10/24 Hours
Root Allan Variance 1 sec    5x10-12
Phase Noise: -85 dBc/Hz        -125dBc/10 Hz
Amplitude 10MHz: 1 Vrms
Impedance: 50 Ohm
58503A Programmability/Connectivity
User Interface: Proprietary
Ports to Peripheral Devices: RS232C
58503A Power Requirements
Input Power: Universal 90-260 Vac  & 50-60Hz



Warranty -

This item is sold with a 3 Day Satisfaction Guarantee.

 So bid with confidence.

As our many customers will attest, we will do our very best to resolve any customer problems.  But our official policy is: 

  • This item comes with a 3 day right of return policy.
  • All returns must be made within 3 days of receipt. 
  • All warranties are void if the calibration / warranty seals are broken.
  • Equipment must be shipped correctly and returned with all accessories.
  • Customer is responsible for all shipping charges on returns.
  • Foreign Buyers please be aware:  We offer no warrentee or returns on items shipped outside the USA.



Shipping Policy

Buyer will pay $35.00 packing and shipping in the continental United States.  We will make every effort to ship within 24 hours of receipt of payment.  We ship with FedEx & UPS only.  We will be glad to ship with other carriers using the purchasers shipping account.  Please contact us to make any special shipping arrangements. For shipping rate research, our shipping address is Boulder, CO USA ---- Zip Code is 80305.

Foreign buyers:  Unless special provisions have been made, you are responsible for making your own shipping arrangements and all costs related to customs, duties & special packaging requirements.  Please do not ask us to quote you international shipping rates.  Use the address information above to research you own shipping rates.  You can email waltwhite@ascentconcepts.com to get the packaging fee, package weight and size for your research.  Items sold outside the USA are sold as is.  



 Payment Policy

We accept Credit Card payment through Paypal.   We accept Cashiers Check or Money Orders.


Ascent Concepts and Technologies is a Research & Development Lab.  As a service to the companies and institutions we work with, we broker their excess equipment & act as application specialists on their new equipment needs.  We are now offering quality used equipment to the public with the same level of professionalism and service.   Please feel free to email at thomasknox@ascentconcepts.com or call Thomas @ 1-303-554-0307 with any Technical questions.  Please feel free to email at waltwhite@ascentconcepts.com or call Walt @ 1-720-276-8288 with any Shipping or Logistical questions. We make every effort to evaluate and guarantee our equipment.  Although we do not provide NIST traceable calibration, we do have extensive in house calibration equipment and make every effort to test and verify performance on equipment we sell.  However we do not warranty any items shipped outside the United States. 

Check Out Our Other Auctions Here



The equipment shown is a representation only.  We often have multiple units in stock so please email us with your needs.  We have a large inventory and can usually find any test and measurement item in a short time frame.------Inquires info@ascentconcept.com