[TowerTalk] TowerTalk Digest, Vol 191, Issue 11

[Drew Vonada-Smith]

John,


My experience over 10+ years with the amp is that A2000 faults are a pain, but always end up identifying real issues.  I have found bad UHF F-F adapters, almost shorted PL259 terminations, carbon tracks in coax flying leads, corroded SO239 center pins, bad baluns, and a few other things.  If the fault goes away with a dummy load, there is something on the other side of that connection that is normally OK but breaks down at power.  Sometimes they will be arcs that are very brief and you'd never otherwise notice...a typical amp will ignore them.  Check all adapters and all solder terminations, including the center connection of the dipole and any balun used.  If you cant find anything, take the next step....cut off and reterminate all junction points.  Replace coax that has been crushed or too tightly radiused.

Paying attention to the A2000 complaints over the years has created work, but improved the reliability of my station.

73,
Drew K3PA

----------------------------------------------------------------------

Message: 1
Date: Fri, 9 Nov 2018 12:45:51 +0000
From: W1JCW John <W1JCW at hotmail.com>
To: "towertalk at contesting.com" <towertalk at contesting.com>
Subject: [TowerTalk] Arc fault Acom 2K
Message-ID:
        <DM5PR10MB15773F4C163847BA06AE21D0F7C60 at DM5PR10MB1577.namprd10.prod.outlook.com>

Content-Type: text/plain; charset="us-ascii"

Have a strange problem in the shack.

Run the same antennas and had no issues, put in line my Yaesu 5000 and palstar AT.
All antennas tune flat 1:1 but when I run QRO the Acom 2K comes up with arc fault even with low drive of 20watts.

I can place a load at the end of the coax outside and have no issues but when I got to any antenna 260' center fed dipole or a vertical I get a fault and the amp shuts down.

Sounds like an RF issue but why now when nothing has changed outside?

Have not seen anything like this in 40yrs I've been operating.


73-
W1JCW
John



------------------------------

Subject: Digest Footer

_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk


------------------------------

End of TowerTalk Digest, Vol 191, Issue 11
******************************************