The approach you describe is for transit suppression and is not suitable for
over voltage protection. I urge you to build the proper OVP circuit and
install it in your power supply.
With regard to depending on a fast blow fuse, typically the rating of a fast
blow fuse is 135% of its stated value in amps and for a duration of up to 60
minutes. It is rated at 200% of the amp rating for 120 seconds. Your radio
won't last that long.
----- Original Message -----
From: "Hulett, Russell" <firstname.lastname@example.org>
Sent: Wednesday, April 01, 2009 8:22 AM
Subject: Re: [TenTec] Need advice about OVP for 262G
> Evidently several years ago, someone suggested installing a 1.5KE15A
> transient suppression diode with a fuse at the PS output. This seems like
> a simple solution to me compared to SCRs, added circuits etc. One
> question, since these diodes will clamp, thus protecting the load ( my
> Triton IV ) why won't the 4A slow blow on the transformer input do the
> I'm thinking of building the zener and an in-line fuseholder into the
> cable between the 262G and the 540. That's to avoid modifying either the
> power supply or the radio. Wonder if anyone else has used that approach,
> and whether I'm missing something crucial.
> 73, Curt KB5JO
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