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Narda model 776B-20 20 db fixed attenuator

These brand new, unused Narda 776B-20 fixed attenuators are 20 db, and rated 50 watts CW continuous dissipation. Frequency range is DC-18 Ghz. These attenuators feature type "N" connectors, Male on one end, female on the other.  Length overall is 6.5 inches. Diameter of heatsink fins is 1.75 inches. Weight is 10 ounces (280 grams).  Again, these are brand new, unused units!  

Order as:  Narda 7776B-20 attenuator      Price: $195 each!   
(Order Now!)

(Why pay up to $275 each for USED?)

HP8495H-K01 and HP8494H-K01 diode suppressors with control cables

We have a few extra control cables that were removed from the HP8494H and HP88495H step attenuators that did not meet our standards.  Each cable includes the associated optional diode suppressor. Total length is approximately one foot.  We do not have the wiring diagrams or pin-outs for these cables, but they were wired properly for the associated attenuators from which they were removed.  
  $19.00 each (Your choice. SPECIFY) (Order Now!)

Hewlett Packard model 33321H programmable step attenuator, option H09

Above photo shows (at top) the 33320H and 33321H removed from equipment.

We have good supply of these beautiful Hewlett Packard (Agilent) programmable step attenuators available, all of which were removed from new / unused equipment. They are therefore essentially unused, in perfect operational condition. The HP 33321H is programmable 0-70 db in 10 db steps. Rated DC to 18 Ghz, the HP 33321H offers exceptional repeatability and reliability. Precision gold-plated leaf springs ensure long life (rated over 5 million cycles). Fast switching time of 20 ms, including contact setting speeds automatic testing.

Frequency range:  DC to 18 Ghz.
Attenuation range:  0 to 70 dB, 10 dB steps
Insertion loss at 0 db: 0.4 dB + 0.07 dB/Ghz.
Maximum SWR: 1.35 to 8 Ghz., 1.5 to 12.4 Ghz., 1.7 to 18 Ghz.
Repeatability life: 0.03 dB maximum, 5 million cycles per section.
Connector type:  SMA female
Programming connector:  We understand that option H09 is solder terminals via RF feedthrough capacitors (best for high RF environments)
Control voltage: 24 VDC Power rating: 2 W CW max.
***May be cascaded in series with the model 33320H to achieve 0-81 dB in 1 dB steps!
Measures: 4 5/8" long, including connectors, 1" wide, and 2" high.
Weight: 9.5 ounces

Why pay well over $500 each? 
Our price

Expanded instructions for HP programmable attenuator, model 33321H

To use the HP model 33321H programmable attenuator, you need a regulated, filtered power supply to provide 24 volts DC.

Connect the POSITIVE (+) lead to terminal # 4, and leave it connected .  If you make an error and connect negative (-) to this lead, it probably will not do damage, as these units provide some reverse polarity protection, but the unit will of course not operate if polarity is incorrect . Again, this unit has common POSITIVE (+), not common negative!

Terms: When we say to pulse, we mean to apply voltage only for a moment. Do not leave voltage supplied to the (-) terminals.

This may easily be accomplished by putting a SPST (single pole, single throw), MOMENTARY, normally open switch in series with the (-) supply wire. This is basically the same type of switch you would use on a doorbell. It is closed only as long as you hold it closed.

To switch IN the 10 db attenuator, PULSE 24 volts DC (-) to pin # 1.  

The 10 db will stay active until you remove it by  pulsing pin # 2 with 24 volts dc (-).

To switch IN the 20 db attenuator, PULSE 24 volts DC (-) to pin # 3.  

The 20 db will stay active until you remove it by  pulsing pin # 5 with 24 volts dc (-).

To switch IN the 40 db attenuator, PULSE 24 volts DC (-) to pin # 6.  

The 40 db will stay active until you remove it by  pulsing pin # 7 with 24 volts dc (-).

If all three attenuators are switched in, you will get the total of the three, or 10 + 20 + 40, or 70 db total.

NEVER exceed 2 watts of power through this attenuator. If you do, you will burn it out.


To order, use our secure online order form, or call us Monday through Friday 7 AM - 4 PM Eastern time at 770-973-6251.

You may also print the order form using your browser's print button and fax your order to us at 815-461-7730. PLEASE give us your email address so that we can easily contact you in case we have a question.

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RF and Microwave Components Online Catalog










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