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Peter Duffett-Smith
mag 21

Connecting a Baby Loop to an MB1

3 commenti

Hi - I have an MB1 transciever, which uses the Kenwood TS480 protocol on its serial interface. I wish to use it with my Baby Loop antenna in semi-auto or full-auto mode. I have connected the com ports together using a straight-through female-female connector, and have matched the serial parameters at both ends. However, the Loop Antenna ATU does not respond to changes in the MB1 frequency. Has anyone made this work? - best regards - Peter

mag 23

Hi, Peter,

If you look at the User Manual of your MB1 you will find that the RS-232 port has Receive Data on pin 2, Transmit Data on pin 3, and Ground on pin 5. Equally, the RS-232 port on the back of the Ciro-mazzoni loop controller is a male DB9, the same as your MB1, and its pin connections are the same, Receive Data on pin 2, Transmit Data on pin 3, and Ground on pin 5. You need to use either a NULL Modem, or rewire your cable to cross the transmit and receive data lines over. When you set up your C-M controller, you need to select CAT 1 as this is the mode where it will respond to the ASCII control commands as used by your MB1. With the speed correctly set, it should work correctly.

73, Adrian, 5B4AIY

Peter Duffett-Smith
mag 23

Hi Adrian - many thanks indeed. I was misinformed about the cable I needed, but have now ordered the null-modem replacement - best regards - Peter

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  • gm7eey
    un giorno 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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