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feb 22

MOTOR FAIL when tuning to 6,600kHz

1 commento

After having replaced a faulty actuator and updating to the latest firmware (Version 3.29) I noticed an occasional 'MOTOR FAIL' error when attempting to tune to 6,600kHz. The short story is that this error can be provoked depending upon how the actuator is driven into its lower electrical limit.


Using the Test/Debug feature by pressing and holding the '/' key for 3 seconds, and starting by driving the antenna well away from its lower electrical limit, if the antenna is then driven into its limit at high speed by pressing and holding the '3' key, when the motor stops and the resonant frequency measured it is 6,547kHz. If the antenna is again positioned well away from its limit, and now driven at medium speed by pressing and holding the '2' key, the resonant frequency when the motor stops is now 6,588kHz, and if this is repeated but at slow speed with the '1' key the frequency is only 6,593kHz.


This latter frequency is very close to the lower limit of 6,600kHz, and if the electrical limit is reached during a fine tune operation, then a 'MOTOR FAIL' message will be triggered.


Repeating this experiment at the upper electrical limit gives 30,319kHz at high speed, 30,199kHz at medium speed, and 30,189kHz at slow speed. This shows that the setting is much less critical at the upper end of the tuning range as these frequencies are well removed from the upper limit of 29,800kHz.


The obvious cure for this is to drive the actuator into its electrical limit using 24V, but now alter the gap of the plates to compensate for the overrun, and I suggest 14mm instead of 15mm. I will shortly be re-locating my antenna, and I will experiment and see if I can determine the optimum spacing. Adrian Ryan, 5B4AIY

ago 24

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  • gm7eey
    5 giorni fa

    Anyone suffer from poor tune on 20m when the Midi loop gets wet? When I build this one I noticed that the Gamma match tubing had a badly seated cap, when I removed it to inspect a few drops of water came out of the tube. Am going to take the loop down today and inspect this again as its been quite wet recently but am interested to know if this is a known issue. This is a used loop and as far as I know it was stored indoors prior to my assembly and when I did the build, the loop was only outdoors for about 2 days before it went on the mast. Was rather surprised to see the water and trying to tun last night when raining, 20m was nothing below 2.1, today now its dry kinda back to normal at 1.6 ish. Real concerned that water is getting into the co-ax section and thats bound to be bad news. 73s Pete
  • Robert Carswell
    ott 23

    Hi I have a brand new Baby Loop and have a problem straight away. After assembly I went through the installation First Turn On process. Set the loop type and moved to using the star key and setting the frequency as advised to 7050 pressing the enter key looks as though it will do something but the ATU just shuts down and restarts. I have attempted the Auto Detect routine and it fails with same issue the ATU just shuts down and restarts. The display shows 18000 khz with a SWR of 1.6 which is presumably after the factory tested the loop. The firmware is 3.29 and the board is 1.06.0663. I have downloaded the firmware again as per the manual and it doesn't appear to do any upgrading as presumably it already knows the firmware installed on the ATU is version 3.29 I have checked the twin core cable I am using with a 12volt battery and it checks out with the volt meter. I have checked the antenna cable which is mini 8 and that checks out. I have attempted the procedure for manual testing of the motor control as per the manual on page 70 entering the frequency of 7050 pressing enter which shows TEST: Duty 21% 7050khz SWR: 9.9 Pressing 9 to open the loop just shuts down and restarts the ATU During the manual testing I have checked across the motor cable plug on the rear of the ATU and there is no voltage at the terminals during any of the setup procedures or the manual testing of the motor control. This is a brand new never used before Baby Loop and fails at the first turn on stage. I have contacted the supplier but being the weekend there is no one available to help Any one any idea of the issue?
  • jeffsmithchicago
    set 19

    I received the Baby loop last week and assembled it. After setting it up a few feet away from the desk I decided to connect it and run some tests to give it a shake down. It worked perfectly considering it was only a few feet away from my radio desk and then it just seemed to die with no error messages or anything. The loop is "open" all the way and will not move at all. When manually entering a frequency it goes thru the normal message of tuning but does nothing else, no motor sound or anything. Any advice to get me going in the right direction?

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