[TenTec] Using Non-TT Supply

[Jerry Haigwood]

Hi Rick,
    Don't forget that in the early days, TenTec used to use magnetic circuit
breakers to protect finals.  I am not sure how fast the breakers were but
they can't be faster than electronic current limiting.  I use a smaller
Astron switcher power supply.  It is rated at 18 amps maximum and will go
into current limiting at 20 amps.  So far (2 years now), I have not had any
problems.
Jerry W5JH
"building something without experimenting is just solder practice"

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Rick -
DJ0IP / NJ0IP
Sent: Tuesday, August 27, 2013 11:29 PM
To: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] Using Non-TT Supply

Paul,

The over current protection in your RSM 35 is not the same as the over
current protection used in the Ten-Tec power supplies.  The RSM 35's over
current protection is to protect the power supply itself.  The Ten-Tec power
supplies had their over current protection set to exactly the maximum
permissible current for the transceiver's finals, and that helped protect
the final transistors.  Ten-Tec used this method for almost 20 years.  I
think the Omni VI was the first transceiver which did not rely on the power
supply for the extra protection.

There is nothing special about the Ten-Tec circuit, other than the point at
which it shuts down.  Older models ceased at 18A, later ones at 20A (as the
new transceivers required more current).    Any good power supply with an
adjustable current parameter would also work like the Ten-Tec power
supplies.  However how often do you see someone using a P.S. with an
adjustable current limit?

Bottom line, your suggestion is only good for the newer transceivers.  Don't
use it with the older Omni's or Corsairs.

73
Rick, DJ0IP


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Paul
Kraemer
Sent: Tuesday, August 27, 2013 11:46 PM
To: tentec at contesting.com
Subject: Re: [TenTec] Using Non-TT Supply

John
I use Astron RSM 35 with all my solid state radios including OMNI VI Very
good supply with overvoltage and over current protection Paul


--------------------------------------------------
From: "John Farler" <k4avx1 at windstream.net>
Sent: Tuesday, August 27, 2013 3:21 PM
To: <tentec at contesting.com>
Subject: [TenTec] Using Non-TT Supply

> My supply for the TT Omni V or VI has problems.  When I tune up, even 
> to a dummy load, the pilots in the radio dim and output is not where 
> it should be on 40 meters and up.
> Current is less than 20 A, but I haven't checked the voltage drop yet.
> 
> My question is can I use a non-TT supply with the Omni VI safely?  I 
> remember someone on the list saying TT stopped using the original type 
> of power supply like the one with the old Triton which kicks of at a 
> certain current, but I can't remember which radio it is that doesn't 
> depend on the "circuit breaker" type of protection.
> 
> I have several non-TT supplies that will provide the current and more
> - is it safe to use them with the Omni V, VI??
> 
> I'm guessing the filters in the power supply have gone bad...actually 
> it has 3 in parallel.
> How can I check for one bad one, or can I?
> 
> Thanks, and I hope my post is not too confusing....
> 
> John, K4AVX
> k4avx1 at windstream.net
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