Kim:
I would look at the low-pass filter board for the problem, especially if it
also happens on 17 meters as well as 15, but not on other bands. My first
suspicion would be a cold solder joint on K10 or K11 on the A1 board, or on
any of the associated components: C 21, 23, 48, 78 or L 12 or 16. K10 or
K11 could also have bad contacts.
Since this happens on CW and on both an antenna and dummy load, I would tend
to discount an RFI related problem, although it certainly is a possibility.
Try transmitting with the covers removed and tap the various components with
a non-conducting tool and see if that makes the problem come and go.
Are there any other symptoms, such as more of a problem at 100 Watts than at
a lower power?
Ron N6IE
www.N6IE.com
----- Original Message -----
From: "Kim Elmore" <cw_de_n5op@sbcglobal.net>
To: <tentec@contesting.com>
Sent: Tuesday, April 27, 2010 6:20 PM
Subject: [TenTec] Orion II 15 m CW Transmit Power Fluctuation
I have noticed a subtle characteristic with my OII on 15 m CW
transmit: the power output varies in a random fashion key down CW.
This happens whether I use a dummy load, tuner, or antenna. I noticed
this with the V2.041XL firmware, and so went to the 2.039d firmware.
Using V2.041XL on 15 m, with the power output is set to 100 the ALC
light didn't illuminate, but did using V2.039d. I still, however, see
the power output fluctuation with either firmware version. Using
V2.041XL, I see this a bit on 12 m, too. I only see it on 15 m using
V2.039d.
Has anyone else noticed this?
Kim Elmore N5OP
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