And just how do you think they do a "double make" contact? :)
Bridge the two armature contacts on a dpdt or dpst relay and you get a double
make spdt or spst.
On Sep 27, 2010, at 8:39 PM, "Ron W8RJL" <youngron@verizon.net> wrote:
> For anyone who might be confused by the armature and parasitic verbage here
> is what Allan Bradley has to say about Form X relays:
>
>
> A Form X contact arrangement is one which has single-pole, single-throw,
> normally open double-make contacts. The function of this arrangement is to
> close a circuit when actuated.
>
> Forget about parasitics and armatures. It is just a contact configuration.
>
> 73,
> Ron W8RJL
>
>
>
>
> ----- Original Message -----
> From: "Jim Lux" <jimlux@earthlink.net>
> To: <richard@karlquist.com>
> Cc: "Van K7VS" <wa7fab@cdsnet.net>; <towertalk@contesting.com>
> Sent: Monday, September 27, 2010 11:20 PM
> Subject: Re: [TowerTalk] X99KP 12VDC RELAY FOR AMERITRON REMOTE ANTENNA
> SWITCHES
>
>
>> W8JI mentioned tat they have form X contacts. That is the two contacts on
>> the armature are bridged permanently, and there's no separate connection
>> to the armature. Sort of like a rf transfer switch. Reduces parasitic c
>> from armature to coil, etc.
>>
>> On Sep 27, 2010, at 10:55 AM, "Rick Karlquist" <richard@karlquist.com>
>> wrote:
>>
>>> Van K7VS wrote:
>>>> THE X99KP 12VDC RSCo. SPDT RELAYS ARE MANUFACTURED BY A COMPANY IN
>>>> CHICAGO
>>>
>>> The company is probably Magnecraft, in my old home town of
>>> Des Plaines, IL, a suburb of Chicago. They show some
>>> nice off the shelf relays for antennas. Maybe the
>>> Ameritron has gold plated contacts as a special. That's
>>> the only thing I can think of where the OTS relays
>>> are less than optimum.
>>>
>>> Rick N6RK
>>>
>>> _______________________________________________
>>>
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>
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