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Post by broadcastpro on May 24, 2008 23:21:43 GMT -5
I am about to do our first real use of the PowerAim. Any recommended methods for looking at the Z of a broadcast tower? I am most interested in the tower, rather than the ATU
Thanks
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Post by Bob on May 25, 2008 7:56:55 GMT -5
I am about to do our first real use of the PowerAim. Any recommended methods for looking at the Z of a broadcast tower? I am most interested in the tower, rather than the ATU Thanks This will be an interesting application. Use the 'custom cal' function to cancel the effect of any transmission line that's used to get from the PowerAIM to the feed point. The frequency step size can be 5 or 10 KHz while covering the BC band. The start/stop/step values can later be changed to anything you like and you can still use the same cal data file. When making measurements in the BC band, custom cal is recommended because the standard cal procedure only takes data at 1MHz intervals. If you're interested in swr symmetry, contact me about the latest PowerAIM routine to do IBOC evaluation. This is being beta tested now. -- 73/Bob |
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Post by radtek on Jul 29, 2008 20:45:52 GMT -5
Hi,
Can we sweep the tower and to find out the resonat length before matching it to ATU by using the AIM 120 abd How? thanks
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Post by Bob on Jul 29, 2008 22:57:57 GMT -5
Hi, Can we sweep the tower and to find out the resonat length before matching it to ATU by using the AIM 120 abd How? thanks Yes, you can find the resonant frequency of the antenna without the ATU. You can find the impedance at the desired frequency and then calculate the values for the ATU. Also, you can manually adjust the ATU while the AIM is in the recycle mode. There is an example of measuring a 160meter antenna and using the raw data to design the tuning coil on my website. www.w5big.com. The principles are the same for the PowerAIM. -- Bob |
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Post by radtek on Jul 30, 2008 0:08:51 GMT -5
thanks, very much.
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