Date: Tue, 28 Sep 2010 20:40:19 -0400
From: "Gene Fuller" <w2lu@rochester.rr.com>
Subject: Re: [TowerTalk] Fwd: Fwd: X99KP 12VDC RELAY FOR AMERITRON
REMOTE ANTENNASWITCHES
To: <towertalk@contesting.com>, <hanslg@aol.com>
Message-ID: <223C47AEC0C349F8A59B49072D9CBFC0@FamilyRoom>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Not quite on the voltage, I think. Whether open or closed wouldn't the
first in the series have full voltage to ground or to the coil ? Onl;y if
they were indeed mechanically and electrically daisy chained (difficult to
do) would the voltage divide up through the series.
Gene / W2LU
----- Original Message -----
From: <hanslg@aol.com>
To: <towertalk@contesting.com>
Sent: Tuesday, September 28, 2010 6:00 PM
Subject: [TowerTalk] Fwd: Fwd: X99KP 12VDC RELAY FOR AMERITRON REMOTE
ANTENNASWITCHES
> Obviously, if any of the contacts weld together, that's it. I know that
> there are problems paralleling diodes
## I have never had problems paralleling diodes...or anything else, like caps,
bandswitch wafer's, etc.
The secret is, you require equal lengths' going in an out of the contacts on
relays. Inputs have
to be the same, and outputs have to be the same. For stuff like 3 x pole
relays, or a mess of diodes
all in parallel.. the trick is to go in on the top left hand corner, then exist
the bottom right hand corner...
or enter the bottom right hand corner, and exit the top right hand corner.
That way the TOTAL in and out
length is the SAME for each device. THEN the current will split equally
among all the deices you are paralleling.
## In a remote switch box, You are not hot switching, so no issues. You are
NOT turning a 2 hp motor on/off.
The peak V with 1.5 kw is so low [388 v peak /275v rms] that V is not an
issue. And yes, you can series contacts
from 2 x relays to increase V rating.
Jim VE7RF
but I don't know if, and don't
> believe, the situation is the same for relays. If you don't switch under
> power, which you normally don't do with antenna relays, I believe you, at
> least almost, double the current capacity by doubling the number of
> connectors. You have to be careful how you parallel the connectors, same
> length,same inductance etc. You might even be able to control the current
> sharing with the "right" lay-out. The voltage capacity is not changed
> though, and I would trust putting several contacts in series.
>
> Hans - N2JFS
>
>
>
>
>
>
> -----Original Message-----
> From: jimlux <jimlux@earthlink.net>
> To: hanslg@aol.com
> Cc: towertalk@contesting.com
> Sent: Tue, Sep 28, 2010 4:33 pm
> Subject: Re: [TowerTalk] Fwd: X99KP 12VDC RELAY FOR AMERITRON REMOTE
> ANTENNASWITCHES
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