Hi Scott NX7U -
You have indicated that the release times indicated are after 0vdc; so, the
following obviously won't be the answer if you are getting an accurate 0vdc
measurement at the coils.
Anyway, 1/2 second could be the length of time required for a filter
capacitor in a small 12vdc supply to discharge enough for a relay to
release. So, be sure that you are not switching the 12vdc in and out on the
transformer side of the capacitor.
Since the relays have no markings, are you sure that both coils are 12vdc?
If not and the above is the problem, then different voltage coils could
account for the difference in release times. Like other types, coaxial
relays identical in appearance often have totally different coils.
73, Lu K5YP
----- Original Message -----
From: "Scott Townley" <nx7u@arrl.net>
To: <amps@contesting.com>
Sent: Sunday, May 28, 2000 23:41
Subject: [AMPS] Slow coaxial relays
>
> I recently acquired some coaxial relays very similar to the DK-60 type
(but
> there are no markings on them). They have 12VDC coils. I was surprised
to
> find that although these relays "make" quickly (not measured but, you
know,
> apparently right when coil voltage switched on) they "break" VERY slowly,
> at least 500msec after 0VDC and one of them literally 2+ sec after 0VDC.
>
> Not being a coaxial relay expert, is this how DC coils act? Do relay
> manufacturers have an option for slow break that I don't know about? Any
> suggestions on how to address the issue? I don't expect QSK operation but
> I think we'd all agree that 1/2 sec break is pretty darn slow.
>
> PS I have some marked DK-60 relays with 6VAC coils and they are
> "instantaneous".
>
> TIA,
> Scott Townley
> nx7u@arrl.net
>
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