Topband: F fitting adaptors

[Ronald Gorski]

Bruce, if you insist on using the Ameritron, PL259 to F adapters are
available at Tower Electronics in Green Bay, WI
They have an online catalog.
Ron N9AU

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Tom
W8JI
Sent: Tuesday, December 04, 2012 5:25 AM
To: Bruce; topband at contesting.com
Subject: Re: Topband: F fitting adaptors

> When using a Ameritron remote antenna switch with SO-239 fittings, 
> does anyone know a supplier for female F fitting to PL-259 adaptor ?
>
> Thanks,
> 73
> Bruce-K1FZ

Bruce,

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



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