Frank are you saying that if VFO A and VFO B are on the same frequency and the
amp is tuned to that freq, you get an ARC fault if TX-VFOA and RX-VFOB and you
don't get an ARC fault if TX-VFOA and RX-VFOA, or is it a more complicated
scenario to induce an ARC fault?
73,
Barry N1EU
"I2DMI" <i2dmi@contestvolta.it> wrote:
>
>
>Hi Rick,
>I think you mean a single band (e.g. 14Mhz only) "bandpass filter" because a
>wide one (1-30Mhz) doesn't solve the problem.
>
>After a full power transmission with RX+TX on VFOA a strange ARCF event
>happens when I tried to tune after I have selected the RX (I said RX not TX)
>as VFOB.
>It seems illogical because the ACOM was previously tuned on the TX frequency
>and both displays show the correct TX frequency!
>Ciao Frank I2DMI
>
>
>
>
>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
>
>
>
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>
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