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ATU TUN power levels
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Mike Kopacki
The K3S owner's manual and the Fred Cady manual both say that when the [ATU TUN] button is tapped, the output power is either 5 or 10 watts and is controlled internally. I can't find anything, anywhere, that says what determines whether it is 5 or 10 watts. Anyone know the answer and where it is written?
Thanks, Mike NJ2OM |
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5 Watts is used for the early ATU tuning phases to avoid the need to roll back drive due to reflected power. When we get to the fine-tune phase where SWR is known to be 3:1 or better, we switch to 10 watts. This improves resolution of the bridge a bit, allowing us to accurately measure down to 1.0:1.
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73, Wayne N6KR On Nov 28, 2022, at 5:33 PM, Mike Kopacki <mikekopacki@...> wrote: |
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With the KPA3 in NOR, I find the ATU TUNE power to be 5.0 watts. With the KPA3 in BYP, I find the ATU TUNE power to also be 5.0 watts. Now with the TUNE PWR set to NOR, I find the ATU TUNE power to be 10 watts.
See page 174 in the Fred Cady manual, TUN PWR 73 Bob, K4TAX |
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Mike Kopacki
Wow thanks, Wayne!
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Thanks, Mike On Nov 28, 2022, at 8:56 PM, Bob McGraw - K4TAX <rmcgraw@...> wrote:
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Mike Kopacki
Bob, P. 174 doesn’t say anything about tuning….
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Thanks, Mike On Nov 28, 2022, at 9:00 PM, Mike Kopacki via groups.io <mikekopacki@...> wrote:
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My comments apply to ATU TUNE, not regular TUNE, which as Bob noted is controlled by CONFIG MENU: TUNE PWR.
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Wayne On Nov 28, 2022, at 6:00 PM, Mike Kopacki <mikekopacki@...> wrote: |
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In the Fred Cady book, page 174 has the table in which one item is TUN PWR. The box to the right of that does explain how 5 watts or 10 watts is selected. In order to have 10 watts of tune power one must have TUN PWR set to NOR.
That's the way I read the description and that is the way I have confirmed my radio works. 73 Bob, K4TAX |
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Mike Kopacki
Bob, maybe we have different versions of the Cady manual? Page 174 is about connecting a PC with the K3 serial port cable. I do see what you are saying on Page 167 though. My original question was about what internally was making the switch from 5 to 10 watts which Wayne explained.
I have the third edition... Thanks, Mike NJ2OM |
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Mike:
My Cady is the first printing, Revision 1.4. I didn't think about different versions. For 10 watts of power for the ATU TUNE, set the CONFIG menu TUN PWR to NOR. For 5 watts of power for the ATU TUNE, set the CONFIG menu TUN PWR to some other value. I use 20 watts. 73 Bob, K4TAX |
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Mike Kopacki
Thanks, Bob. I understand it now!
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Thanks, Mike On Nov 29, 2022, at 8:35 PM, Bob McGraw - K4TAX <rmcgraw@...> wrote:
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