The problem and solution are also present on the higher bands and reducing
drive has no effect. I'm just going to leave the filter inline, where it
normally sits. I reported this info to potentially help others who haven't
found their own solution. If I had a good multi-trace high bandwidth scope (I
don't), I might try to isolate the problem further out of curiosity.
73,
Barry N1EU
"Michael Tope" <W4EF@dellroy.com> wrote:
>It might be the extra group delay from the filter, Barry. You might try
>substituting a long piece of coax for the Dunestar filter. A generic
>5 pole high-pass with a 1.7 MHz cutoff will have about 100
>nanoseconds of delay at 3.5 MHz. That's equivalent to about 70
>feet of RG-8.
>
>Have you checked to see if the problem is consistent across
>all bands from 160 thru 10 (the delay of the Dunestar filter should
>go down as you go up in frequency away from the cutoff)
>
>Also, have you tried reducing drive from the exciter to compensate
>for the insertion loss of the Dunestar filter.
>
>Sounds like an interesting problem.
>
>Mike, W4EF........................................
>
>----- Original Message -----
>From: "Barry N1EU" <n1eu@netscape.net>
>To: <tentec@contesting.com>
>Sent: Friday, December 31, 2004 5:22 PM
>Subject: [TenTec] Acom/Orion
>
>
>> I just wanted to share some anecdotal data on Orion/Acom compatibility.
>>
>> For the past few months I've been using the Orion/Acom2000A combination in
>qsk/keying loop mode with no problems whatsoever. This evening, I suddenly
>started seeing Arc Faults when attempting to transmit cw. I realized that
>the only change I made today to my setup was pulling my Dunestar 400-HPF
>filter out of the line between Orion and Acom. I went back and forth and
>every time the Dunestar was inline, there was no problem transmitting and
>when I removed the Dunestar, I had Arc Faults. Perhaps this is why I've
>never before seen the problems others have reported. I'll leave it to the
>experts as to why the Dunestar filter (used primarily to fight the strong
>BCB signals at my qth) makes the Orion and Acom play together.
>>
>> 73,
>> Barry N1EU
>>
>>
>>
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