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Re: Topband: F fitting adaptors

To: "Bruce" <>, <>
Subject: Re: Topband: F fitting adaptors
From: "Tom W8JI" <>
Reply-to: Tom W8JI <>
Date: Tue, 4 Dec 2012 06:24:54 -0500
List-post: <">>
When using a Ameritron remote antenna switch with SO-239 fittings, does anyone know a supplier for female F fitting to PL-259 adaptor ?



IMO, you have the wrong switch. A transmitting type high-power switch is a terrible device for receiving. The larger the relays (has a general rule) the greater the problem, and it has nothing to do with sealed (enclosed) or unsealed (open) relays.

High current relays are very problematic when only used at low power. The problem surrounds the large contact area and lack of wetting currents, and no significant voltage and current ever being applied to burn through any film on the contact. There are hundreds of papers by relay manufacturers or others detailing this problem, and it even occurs with brand new sealed or enclosed relays.

The only high power relays immune to this issue are vacuum type relays.

I think you are heading for long term problems with adaptors and a transmitting switch.

73 Tom

Topband reflector -

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