[TowerTalk] X99KP 12VDC RELAY FOR AMERITRON REMOTE ANTENNA SWITCHES

[Jim Lux]

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 at 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 at earthlink.net>
> To: <richard at karlquist.com>
> Cc: "Van K7VS" <wa7fab at cdsnet.net>; <towertalk at 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 at 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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