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ESCO and Amphenol RF Coaxial Switches

Amphenol SPDT Manual RF Coaxial Switch (BNC females) Model 318-10401

Manufacturer:                       Amphenol
MFR Part Number:              318-10401
Impedance:                           50 ohms
Number of connectors:     1 Common (Center), and 2 positions, toggle-switch selected.
Connector Type:                  BNC female, silver plated; NOTE: Unselected connector is shorted to case. 

Important Dimensions:
              Max Depth:             1.476in / 37.49mm
              Max Width:              2.004in / 50.91mm
              Max Height:             1.505in / 38.25mm
              Weight:                     3.6oz / 102g

Mounting: Two drilled and tapped holes on bottom of panel and one nut around the switch lever.
Condition:  New, old stock.  

Order as stock # SW-BNC-06  Price each: $59.00
( Order Now!!! )

(Click image to enlarge.)

Max-Gain Systems has recently purchased the remaining inventory of a super-high end manual RF coaxial switch from the former Electronic Switch Company, (no longer in business) .  This coax switch series was the "top of the line" custom manufactured in Germany to very high specifications, and aimed at the commercial and military markets as well as for higher-end amateur users .

The switch wafer used is of German manufacture, and is similar in size, appearance, and function to the famous Radio Switch Corporation of America # 86 . This switch uses true wiping, self-cleaning contacts, heavily plated with coin silver .  The voltage rating and isolation are further increased by using every other position, skipping one between each one that is used . The connectors are installed directly on the switch contact terminals, for essentially "zero" internal lead length . (A must at higher frequencies!)  The double - opposing, wiping contacts make this switch perfect for switching anything from fractions of a microvolt to several kilovolts . (See specs below.)

There are three models of this switch, all of which have six connectors; one input, and five selectable outputs . The enclosure is custom made of all aluminum, and is RF tight . The indexing is the smoothest, most precision that we have ever seen, and we have seen quite a few! All connectors are top quality silver plated, with gold center contacts.

All connectors are mounted axial, not radial . The coax connections are all on the back panel, not the sides, for neat station appearance and easier positioning on the radio table .  Two aluminum mounting angle brackets are included if you wish to mount the switch semi-permanently (by screwing the brackets into the shelf or table) . The design and weight of this switch, together with the smooth, easy switching make this unnecessary in most applications.

The large knob of modern design clearly indicates current position, and is of perfect size for easy position selection . The switch position may be rotated in either direction, for the quickest path to the desired new position.

The power rating on these switches is limited by the connector type chosen, in that the switch itself is capable of more power than any of the three connector types . For both type "N"and type "UHF"connectors, the maximum power handling capability is about 6 kilowatts at 30 mhz into a matched load . Maximum power handling of course decreases with increasing frequency . BNC connectors are rated at far lower power handling than are the "N" and "UHF" types .

Type UHF connectors are not recommended at over 400 mhz maximum .

Laboratory measured insertion loss specs are:

14 . 275 mhz : -37 . 4 dB
51 mhz : -24 . 87 dB
145 . 6 mhz : -16 dB
440 . 6 mhz : -27 . 93 dB
500 mhz : -18 dB

At 30 mhz, the insertion loss equates to an swr of  1 . 074 to 1 !!! WELL better than 1 . 1: 1

Here at MGS, we hipotted one if the model N-105C's, to see what maximum voltages the switch could stand .  When we tested from the center pin of one "N" connector to the center pin of an adjacent, (not selected) position, the switch withstood just over 6,000 volts! When we tested one of the silver-Teflon type "N" connectors from center pin to ground, the connector withstood 4,000 volts . The connectors themselves are the limiting factor as to voltage for this switch, as the switch withstands more than the best of these series of connectors .

The three models are:

Model U-105C 5 position, UHF female connectors (SO-239's) (Sorry . . . this model is sold out! No more will be available . )
Model N-105C 5 position, Type N female connectors
Model B-105C 5 position, type BNC female connectors (Sorry . . . this model is sold out! No more will be available . )

The switch measures 4.75 inches wide X 4.75 inches high X 2.25 inches deep (front panel to end of connectors . ) 

Overall depth, including connectors and knob is approximately 3.125 inches .Weight is 1.6 pounds


Model U-105C (UHF connectors) $155 each (Sorry . . . this model is sold out! No more will be available . )
Model N-105C (N connectors) $155 each
Model B-105C (Sorry . . . this model is sold out! No more will be available . )

 (Order Now!)


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.

Visa and Mastercard accepted!

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