[TenTec] Need advice about OVP for 262G

[Bob McGraw - K4TAX]

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.

http://www.bussmann.com/pdf/b040436b-cbc7-495d-95a6-99fe85202786.pdf


73
Bob, K4TAX




----- Original Message ----- 
From: "Hulett, Russell" <rhulett1 at consolidated.net>
To: <tentec at contesting.com>
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 
> job.
>
> 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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