[TenTec] Hi all...(Omni-D power connector)

[Clayton Brantley]

Tom:  

The exact opposite will happen to the zener.  I have used a 15v 10 watt zener diode and a 20 amp fusefor years.  There is no current limiting resistor for the diode.  When the voltage exceeds 15 volts, the diodeconducts and the diode shorts blowing the fuse and the equipment is protected.
Clayton N4EV


      From: A R <raf_3 at msn.com>
 To: "tentec at contesting.com" <tentec at contesting.com> 
 Sent: Monday, January 2, 2017 11:14 AM
 Subject: Re: [TenTec] Hi all...(Omni-D power connector)
   
Tom,

What are you using for a power supply? The Ten Tec 255 (companion supply for OMNI-X's) and 280 supplies provide overvoltage protection. The 251 and 252 supplies do not provide ovp. TenTec did offer an outboard OVP (TT 1150) that's installed between the supply and OMNI. It's fitted with the 4-pin AMP mate-n-lok connectors...making it a plug-n-play installation for TT 251 and 252 supplies. If your supply doesn't provide OVP, Bel Power Systems (Power One) makes a compact OVP board for installation in the supply. Their p/n is OVP-12G, and they're available from Allied Electronics (for example) for less than $20. The OVP-12G's are easily installed,and have adjustable over-voltage threshold

My guess is that a (shunt) 15v 10W zener isn't going to last long with 20A available... best (but unlikely) case, long enough to trip the (latching?) over-current protection before vaporizing zener "open".

73,
Allen--W7GIF
----- Original Message -----
From: tfr001 at myfairpoint.net<mailto:tfr001 at myfairpoint.net>
To: tentec at contesting.com<mailto:tentec at contesting.com>
Sent: Monday, January 02, 2017 6:50 AM
Subject: Re: [TenTec] Hi all...(Omni-D power connector)

Another question would be - anyone ever try to replace that connector
with something more rugged?

I also ordered a new-old-stock 1N2979A (big 15V zener) off of Ebay to
replace the big diode where the power comes into the chassis.
Not sure why TenTec didn't do that orginally. The manual says something
about it being there to blow the fuse for reverse polarity - why not
make it a zener and
get an over voltage crowbar too?
-Tom N1OOQ

On Mon, 02 Jan 2017 08:32:14 -0500, tentec-request at contesting.com wrote:

      >Yes, AMP Mate-n-Lock. It should be available from Mouser and Digi-Key.
>
> Bob WB2VUF
>
>
> On 12/30/2016 8:50 AM, shawn via TenTec wrote:
>> Molex Mate n Lock comes to mind.
>>
>> shawn kb1ckt
>>
>> Sent from my iPad
>>
>>> On Dec 30, 2016, at 8:44 AM, tfr001 at myfairpoint.net wrote:
>>>
>>> Newbie on the list.
>>> I have an Omni-D that I'm currently troubleshooting for flaky
>>> connections that seem to come and go with warmup.

>>> My question to the list is: does anyone know the part number of the
>>> 4-pin power connector? With all of my messing around, the plastic
>>> ears on that thing are taking a beating. It looks like a Molex.
>>> -N1OOQ

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