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Date Posted by Category User IP

2013-11-18 (UTC)

N1JR

Switches

ip72-221-88-80.ri.ri.cox.net

ESCO U105C RF Switch

This RF Coaxial Switch is from MAX-Gain Systems. This model (UHF) is sold out by them. This unit is unused. It is 1P5T. This is the text from their site:

"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 .

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"

Price: $145 plus shipping
Email: jsrobbins@earthlink.net

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