Tohtsu RF Relay - VHFUHF Forum at eHam.net

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eHam.net Forum : VHFUHF : Tohtsu RF Relay

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Tohtsu RF Relay	Reply
by K3SZY on October 27, 2009	Mail this to a friend!
I am now using two old Dowkey 60-22284 UHF connector relays back to back to switch between xmit/rcv at my AM-6155 144 MHz amp. I want to retire these relays to a single Tohtsu CZX-3500 N connector. Max output of the amp is 400w. From what I see the Tohtsu's spec. is 65dB isolation at 150 MHz vs 70dB for the pair of Dowkeys. Will this be enough isolation? I don't believe a single Tohtsu CX-600N would be enough isolation. Thanks Ron K3SZY

RE: Tohtsu RF Relay	Reply
by WB2WIK on October 28, 2009	Mail this to a friend!
What are you trying to do? Is this the T-R bypass relay to switch an amplifier in and out of line between a transceiver and an antenna? 65 dB down from 500W is about 140 microwatts. That can't hurt anything, or any kind of receiver front end that I've ever seen (this is about 80mV at 50 Ohms). Every RX I have including sensitive GaAsFETs and MESFETs can handle >1V at 50 Ohms. I think 65 dB would give you more than 10 dB margin on that. If that's what you're trying to accomplish! WB2WIK/6

RE: Tohtsu RF Relay	Reply
by K3SZY on October 30, 2009	Mail this to a friend!
WB2WIK/6 Thanks Yes it is the T/R bypass switching for the amp. After further review I have decided to go with a CX-800N relay. That will do what I want and give me plenty of head room in case I go QRO. k3szy

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