[TenTec] possible power supply for Herc II?

[Tom Macon]

At first look, it seems like this supply is a fairly good match but the 
devil may be in the details.  The 9420 is made up of 4 - 25amp supplies 
while the AA978 contains 5 - 20 amp supplies.  While both add up to 100 
amps, there's more to the story.  As you probably know, the Herc contains 
four parallel rf amplifiers, each fed by one of the four supplies in the 
9420.  The first question is whether you can get by with 20 amps instead of 
25 for each amplifier.

The 9420 also has a fifth small supply that's always on.  Maybe the fifth 
supply in the AA978 could be adapted for this or add a separate, small 14v 
supply.  After that, there are many questions as to how the control and 
overvoltage protection circuitry can be adapted.  This would all take some 
work to figure out - hopefully someone out there has already done this. 
While I have a Herc, I have no experience running it on anything but the 
9420.

Hope this helps a little.

 - Tom, K9BTQ


----- Original Message ----- 
From: "Peg Haese KB9LIE" <kb9lie at yahoo.com>
To: <tentec at contesting.com>
Sent: Wednesday, August 05, 2009 10:26 AM
Subject: [TenTec] possible power supply for Herc II?


>
> I have an Omni V rig and HERC II amp with the companion 9420 power supply. 
> They work great.
>
> Paul K9OT liked it so well he got another Herc II but no PS. Now we have 
> found a used Audio Authority Model 978-100 switching power supply. Will 
> this work okay for the second HERC II which would be used for a Corsair II 
> or possibly other rigs?
>
> The fellow selling it uses them for a VHF repeater system. He says it may 
> need filtering for HF but didn't have any details. Does anyone know if 
> this will actually work out and what to do, or should we look elsewhere?
>
> 73 de Peg KB9LIE in sunny SW Wisconsin USA
>
>
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec