[TenTec] PA current control

[Kevin Purcell]

Excellent thread highlighting a unique TT feature.

So TT introduced this feature after the Delta/Cosair (and the Argosy)  
which seems to put the timeframe in the mid-1980s (perhaps) with the  
Paragon 1 being the first? That's a useful feature that not often  
mentioned in those rigs.

Is this feature only in the "top of the line" desktops?

Or is it used in the:

Argonaut II/Delta II
Scout 555
Argo Scout 556
Pegasus
Jupiter

If anyone can inspect the schematic for these rigs and say yeah/nay  
that might help the "global pool of Ten Tec Knowledge".

TT lineage is at ...

<http://lists.contesting.com/archives//html/TenTec/2001-01/ 
msg00777.html>

I also note that the ALC for the Argosy 525D is derived from the  
forward power in the SWR detector and the finals assembly the +13v in  
line is easy to get too so a similar sort of mod is possible without  
hacking the boards (add a sensing resistor in thePA power line and  
amplifier to generate generate an ALC signal.

It looks possible in other rigs of the same era (like my 546C Omni D  
rev C) which use the same scheme.

Having this thread in mind one can see the "backstory" behind the  
comments in about SWR in the manuals of the early 1980s models.

So an Airpax circuit breaker is needed with all of these earlier  
models if you don't use the original TT PSU.

On Sep 24, 2007, at 1:34 PM, Bob McGraw - K4TAX wrote:

> As I recall, and I don't have a manual in front of me, the Corsair  
> series and the Delta series did not use current sensing the similar  
> way that the Omni and Paragon series of implementation.

--
73 DE N7WIM / G8UDP
Kevin Purcell
kevinpurcell at pobox.com