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@consolidated.net>
To: <tentec@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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