Systron Donner
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Systron Donner 6244

Frequency Counter


The Systron Donner 6244A is a 4.5Ghz counter.  This instrument is compact, well made and easy to use.  Readout on a 8 digit LED display (best resolution 0,1 Hz) with leading zero suppression and display storage.  The Instrument is in excellent physical and electrical condition.  It has been tested and passed in all bands.

This is a well made instrument.  The case is a high quality casting, clam shell construction.  It has the oscillator is mounted to the top half.  The Overair oscillator appears to be a very high quality 10MHz worth well more then our starting bid by itself.  The unit uses teflon wire through out.   I do not know if the Ovenair is the standard or optional oscillator,  but the unit does include option 11.

- Input A: 20 Hz to 100 MHz - 10 mV rms - 1 MOhm
- Input B: 100 MHz to 512 MHz - 10 mV rms (-27 dBm) - 50 Ohm
- Input C: 0,5 GHz to 4,5 GHz - 50 mV rms (-13 dBm) - 50 Ohm


  • For input signals up to +20 dBm (2,25 Vrms)

  • Built-in Overload Protection.

  • Display resolution may be selected from 0,1 Hz bis 1 kHz in decade steps from front panel pushbutton selectors.



As our many customers will attest, we will do our very best to resolve any customer problems.  But our official policy is: All items sold are guaranteed against D.O.A. only. All claims must be made within 3 days of receipt.   All warranties are void if the calibration / warranty seals are broken. 

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 & acting 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 or call Thomas @ 1-303-554-0307 with any Technical questions. Please feel free to email at 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 in house calibration equipment and will make every effort to test and verify performance on equipment we sell.  However we do not warranty any items shipped outside the United States.  All equipment we sell comes with a three day right of return unless stated otherwise.

Shipping Policy

Buyer will pay 35.00 packing & shipping in Continental USA.  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 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.


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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