Condition: Used

Tested and fully functional. Excellent condition, minimal usage, supplied as pictured.

Refer to image 17 showing:

• Almanac Status: OK
• Correct time
• Phase lock
• Oscillator mode: 4
• Satellites: 5 

Refer to image 18 for reference results showing a clean 10.000MHz (100.00ns) output.This test was conducted in house with less than ideal conditions, but still yielding excellent results.

Included in the sale:

• Spectrum Instruments TM4-M+ Rubidium Time Frequency Reference System 21351-102
• GPS antenna with cable
• USB cable (JDSU P/N 21130024)
• Coaxial cables (various types, including JDSU P/N 80-30662-01)
• BNC and RF adapters
• USB adapter
• Power cable
• Soft carry case (JDSU branded)

The Spectrum Instruments TM4-M+ is a high-precision rubidium time and frequency reference system, delivering stable and accurate timing signals for calibration, synchronisation, and testing in laboratory or field environments. It supports multiple output channels and offers GPS integration for improved long-term stability.

Shipping & Returns Policy

Shipping Policy

• Processing Time: Orders are typically processed and dispatched within 1 business day.
• Shipping Methods: We offer Expedited Shipping to all destinations using UPS/DHL/Fedex/Royal Mail and other reputable carriers.
• Shipping Times: Mainland UK: 1-2 Business Days / Mainland Europe and USA: 2-3 Business Days / Rest of the World 5-7 Business Days.
• Shipping Costs: These are calculated at checkout based on the shipping method, destination and package dimensions.
• CUSTOMS AND TAXES: It is YOUR responsibility to liaise with customs in your country and ensure your package is cleared and any taxes are paid.
• Shipping Destinations: We ship worldwide.
• Tracking: Once your order is shipped, we will provide you with a tracking number via email.
• Insurance: All shipments are insured. In case of damage, please contact us via email within 48 hours of receiving the product with photographic evidence, please also ensure a report is logged with the delivery driver.

Returns Policy

• Return Period: In the event of an item being received which is 'not as specified', you can return your purchase within 14 days of delivery.
• Condition of Items: Items must be returned unused and in their original packaging.
• Return Method: All returns must be notified in writing to hello@ttinstruments.com, the email should accompany the order number, date and reason for return and must be within 14 days of delivery.
• Restocking Fees: A restocking fee of up-to 20% is applicable for items returned for any reason other than 'not as specified'.
• Refund Method: Refunds are processed to the original method of payment within 5 business days of receiving the return.
• Exchanges: We do not offer exchanges. It will either be a replacement or a refund.
• Return Shipping Costs: Return shipping costs will be borne by the customer unless the item is 'not as specified', in this case we will arrange for the return by way of a prepaid shipping label.