[TenTec] Orion / ACOM 2000A problem solved

[NJ0IP]

Frank,

Several have found a work-around by placing a bandpass filter (e.g.,
Dunestar, ICE, etc.) between the Orion and the ACOM.  One guy actually used
an MFJ-914 matchbox extender.  He found by setting it for an SWR of 2:1
between the Orion and the ACOM, the Arc Fault failure ceased.

The bandpass filter is an expensive fix and doesn't permit cross-band work.
The matchbox extender would permit cross-band work.

I'm not recommending you do any of this.  I'm only relaying what some others
are doing to enable them to use their ACOMs with the ORION.

AT THE SAME TIME, MANY PEOPLE ARE NOT HAVING ANY PROBLEMS AT ALL.
(You guys in this group, consider yourselves lucky.)

The mod you refer to improves the situation considerably, but several who
have performed the mod report that they still get the ARCF problem too often
to be satisfied.

You can effectively desensitize the ARCF detection by placing a 50K Ohm
resister from base to ground of the resistor which triggers the ARCF
condition (i.e., Q13 on the 2000A) but ACOM is warning NOT to do this
because it fears the protection may not be adequate.

There are several people actively working the issue so maybe the "real" cure
will be known soon.  When it is, it will be publicized here.

73
Rick

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of I2DMI
Sent: Tuesday, December 28, 2004 5:46 PM
To: tentec at contesting.com
Subject: [TenTec] Orion / ACOM 2000A problem solved

HI,
 
Yes it is in the ACOM. I have full instruction to do that mod. I can send
via mail instructions and photos.
It requests to be experienced because of high voltage into the ACOM. 
 
Today, while testing, I got an "ARC FAULT" error when I selected TX and RX
buttons on different VFOs (which were not in  the same band).
 
It seems that if TX freq. and RX freq. are different something wrong happens
.. also if you swap only the receiving VFO (!!!).
 
Any idea? thank you
 
73 Frank I2DMI
 
 
 
 
 
C82 and the 200K rsistor are in the ACOM 2000.  This is an ACOM mod and not
an Orion mod.
 
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Tommy" < <http://lists.contesting.com/mailman/listinfo/tentec>
aldermant at alltel.net>
To: < <http://lists.contesting.com/mailman/listinfo/tentec> tentec at
contesting.com>
Sent: Tuesday, December 28, 2004 4:49 PM
Subject: Re: [TenTec] Orion / ACOM 2000A problem solved
 
 
> Frank,
>
> Thanks for you info.
>
> Where was the C82 and the 220k resistor that you changed located? On
> the ACOM or the Orion?
>
> Thanks.
>
> Tom - W4BQF

 

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