[TenTec] Corsair audio prob? 160m

[Edward Crawford]

I would try a different mic. I have seen the D-104's exhibit symptoms like you have described in the past. Could be a faulty mic element. GL. 73. Ed/w4wvw
  ----- Original Message ----- 
  From: Bob Stephens<mailto:bstephens1 at mindspring.com> 
  To: tentec at contesting.com<mailto:tentec at contesting.com> 
  Sent: Sunday, February 29, 2004 9:12 AM
  Subject: [TenTec] Corsair audio prob? 160m


  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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