An old fashion door buzzer operated on AC does about the same thing only
"nasty-er"
73
Bob, K4TAX
----- Original Message -----
From: "Stuart Rohre" <rohre@arlut.utexas.edu>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Wednesday, October 10, 2007 6:06 PM
Subject: Re: [TenTec] Scout question
> Ten Tec told me the way they test the noise blanker for the Scout is to
> cycle a relay whose normally closed contact carries the initial power to
> the
> relay coil..
>
> The normally closed contact wires power to the relay coil and when the
> coil
> power is turned on by an external switch, the relay pulls in breaking the
> power to the coil. The coil releases the contact and it falls back,
> remaking the power connection to the coil. Thus the relay continuously
> cycles until you turn off the switch. The sparking of the contacts is
> used
> as their standard of noise to be blanked. They use a short wire on the
> antenna coax center connector, (on a banana plug) to act as antenna for
> noise pickup for this test. This is easy to replicate with 12 volt supply
> and relay near the short antenna wire, and thus you can test your blanker.
>
> There are many noises the blanker will not help, like most "noise
> limiters"
> or blankers on ham radio gear they are best for spark like impulses.
>
> -Stuart
> K5KVH
>
>
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