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Automatic Tuning Unit
Bruce - KL7JDR
Member
Does the Flex 6000 series Automatic Tuning Unit work in the Receive mode ? 73's , Bruce - KL7JDR
1
Answers
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Yes, it does. Currently only ANT 1 is supported for TX, therefore ATU, also.0
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also, the ATU does not seem to tune on CW; if you switch to SSB, it WILL tune, and seems to stay tuned when you switch back to CW...known bug in xx.17 i think..0
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This is a great conversation that's separate from the main topic, so I created a new "Report a Problem" topic to continue the discussion. Please reference the new topic here: ATU does not tune in CW mode0
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ATU tunes fine in CW if the Tune button is selected prior to hitting atu but tune must be manually turned off after tuning. Carl/K5HK0
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The ATU is located on the PA board in the radio and, when enabled, is inline with either ANT1 or ANT2 (depending on which antenna was used for tuning). The transmitter is required to initiate the tuning algorithm in the ATU. Once the ATU has been tuned and it has been selected (ensure that the tune was successful and the ATU is not in bypass), it will also be in line with the receiver for any slices or panadapters connected to the antenna that the tune was initiated on. So the ATU does work for receive also, but only for the antenna selected when the tune was initiated. Steve3
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so, under ...17 software, 'tune' should be backed off to ?? 10 ?? i HATE hot switching good relays, dude...0
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For the ATU, we reduce the power out of the PA down to around 10W (sometimes lower). This is a low power level and we've had no issues related to switching antennas at this power level. Steve0
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under xx.17 software, i BETTER turn TX drive down from 100%, huh ?? NOT default....0
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Steve, my 6700 with v.0.15.13 does not tune on 20M. Always reverts back to by-pass. Problem reported or just me. Owen KB5XE0
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The tuner measures the SWR before and after a tune and makes decisions about the right final setting. If you have a 1.1 SWR before the tune and a 1.2 after because switching in any additional components yields a worse match, it will revert back to bypass after the tune to give you the best SWR. Do you think this is what is happening or do you have a poor match on 20m? Steve0
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I have two radios and auto tuners that tune my antenna 3.5 to 52mhz 1.1. My flex 6500 will not tune anywhere 3 of the bands. so I am using a ldg for tuner.0
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Check your antenna... You have a high SWR... and the ATU will not tune that frequency. I seen this on160 meter... however, when I go to higher frequency. It works like peanut butter and jelly. SWEET!0
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