| Author |
Message |
    
Delerius
| | Posted on Sunday, July 07, 2002 - 9:42 am: | 
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Just curious, would I run into any troubles if I would leave a Dosy meter connected inline all the time? What about placing the meter after the linear? |
Dx431
| | Posted on Sunday, July 07, 2002 - 2:14 pm: |
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Answer to your first question is, no.You should keep a meter inline to monitor output power and SWRs to insure your system is oppertating correctly.If there is a problem, you will know right away.And as far as placement of the meter. place the meter BETWEEN the radio and the amp.
amp/meter/radio. |
Highlander
| | Posted on Sunday, July 07, 2002 - 7:03 pm: |
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I think the meter should go after the amp. Yes you can leave it inline. |
Dx431
| | Posted on Sunday, July 07, 2002 - 11:22 pm: |
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Delerius, sorry, my mistake. After thinking about it for awhile, Highlander, you are right, it is ant/meter/amp/radio. |
Marconi
| | Posted on Monday, July 08, 2002 - 12:50 pm: |
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I think you are all correct. But consider this.
If your system shows a good SWR result without your amp in line, it is probably a very good idea to place a meter between the radio and the amp or better still, if you have an onboard meter, keep an eye on the SWR's in this area. This helps determine on how things are working as you move up or down frequency away from resonance and how well the transmitter is seeing the line.
If you see a high SWR between your radio and the amp, you might have some loading problems with the amp. Latter, if something happens to the line between the amp and the antenna or to the antenna itself, then the SWR should show a problem wherever the meter is located.
Another consideration is that most meters do not reflect the SWR very well if located after a typical 11 meter amp, even if you have a well matched load and are resonant. This probably has to do with some mismatch of output to the load, harmonics, or such. I understand that transistor types seem to be more guilty of this than the tune and load type tube amps.
Of course it is always a good idea to take an occasional note of your output from the amp so having a meter after the amp is the usual setup.
IMHO, and assuming that the system is sound, the biggest problem, while using an amp, seems to occur with high SWR between the radio and the amp. How do we solve that? Another post maybe or has that already been discussed?
Marconi |
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