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[TenTec] Corsair audio prob? 160m

To: tentec@contesting.com
Subject: [TenTec] Corsair audio prob? 160m
From: Bob Stephens <bstephens1@mindspring.com>
Reply-to: tentec@contesting.com
Date: Sun, 29 Feb 2004 09:12:13 -0500
List-post: <mailto:tentec@contesting.com>
I operated My Corsair on 160m last night. This was my first time on 160. Some of the reports included "something is wrong with your audio". One said there was a high pitched whine, one said "you're breaking up, and one contact started out ok but could not be completed because my "audio disappeared." I looked for some calling stations that were not "busy" and asked for an audio report and they said I sounded fine. I called a local up and he listened to me and said the audio sounded excellent! So I guess I have one of those intermittent varmints. At one point I lost transmit audio entirely (needle did not move) After 30 minutes of scratching my head the audio came back on. The only real change is that I moved to the other end of the band and re tuned.

Here are all the variables I can think of:

-This is a portable temporary station.

-no decent station ground was available

-The antenna was an inverted 1/4 wave L, with the vertical section hung by the side of a (wood) house. The vertical section was about 40 feet, the horizontal ( slight sloper) section was about 60 feet , then it turned and sloped at the end section. The vertical section was about 3 feet away from the side of the (wood) house. There were two 1/4 wave radials plus 2 short radials which gave a for of about 370 feet of radials. (that's about the best I could do in the space and time)

-antenna wire connected directly to MFJ 200 watt mini tuner sitting in the window sill. Radials connected directly to the ground of the tuner.

-The antenna is rather narrow banded and tuner settings changed during the night. I accidentally transmitted at 4:1 once and probably often transmitted at 2.5 to 1 before re tuning to around 1.5 to 1 .

-I reduced power to about 60 watts and turned off the processor. This appeared to solve the problem but 2 hours later I got another "intermittent bad audio" report.

- The D-104 mic seems to work ok with my other rig (Scout) . (but I'm not positive about that)

-The last time I used the Corsair was a short QSO with no problems. However, before that I attempted to use the Corsair mobile in the Scout's usual position in my car. I got reports of audio whine. After I reduced power to 50 watts I got good reports. I assumed it was just a mobile problem. Not sure if that is a separate issue from the problem on 160m last night.

Unless I fall asleep this afternoon <g> I'll try to check into the 20 meter net and let you guys listen.

tnx & 73
Bob
KB1CIW

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