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
>
>
>
> __________________________________________________________________
> Switch to Netscape Internet Service.
> As low as $9.95 a month -- Sign up today at
http://isp.netscape.com/register
>
> Netscape. Just the Net You Need.
>
> New! Netscape Toolbar for Internet Explorer
> Search from anywhere on the Web and block those annoying pop-ups.
> Download now at http://channels.netscape.com/ns/search/install.jsp
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|