Discussion in 'Antennas, Feedlines, Towers & Rotors' started by KK4OBO, Dec 12, 2013.

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  1. KK4OBO

    KK4OBO Ham Member QRZ Page

    I have just received my 897 and am having some trouble getting it tuned.
    I am using a G5-RV
    Radio is set to USB 20 meter
    I am running an ext power supply set at 13.8v
    I am also running through an AT-200 pro tuner

    Now, my problem when i start the tuning process I hear all the relays clicking but the radio is showing HSWR on the screen.
    and the AT-200 is also reporting an out of range SWR.

    Question 1. How long can I key the mike without smoking something? I have power set to 20 watts

    2. The AT-200 manual says that since the G5-RV has ladder line feed that I must use a 1:1 balun, is this true?
    I have seen other posts that have said different.

    I have been able to receive a few calls but have made no contact.

    Thanks for any help
  2. W4ITX

    W4ITX Ham Member QRZ Page

    A few basics first...how high is the swr? Is it over 3:1? Have you checked your coax or coax connectors. Take an ohm meter and check between shield and center conductor. That's the first steps I would take.
  3. KV4PI

    KV4PI Ham Member QRZ Page

    At least long enough to let the tuner complete it's tuning cycle. Since you mention keying the mic, I assume you are using am or fm mode, not SSB correct? What status is the LED bar giving you once the cycle is complete? (how many blinks?)

    Don't worry. It's likely something simple you've overlooked. I've had 4 LDG tuners, and they work really well as long as you follow the instructions (ask me how I know.)

    How are you currently transitioning to coax from the ladder line?
  4. N7WR

    N7WR Subscriber QRZ Page

    If you are trying to tune by keying the mic with the radio set to either upper or lower sideband it won't work, the tuner can't tune, and both the tuner and the radio will show high SWR. You need a steady carrier such as key down CW or AM or FM. And, I would set the radio's power output to 10 watts.
  5. M0GVZ

    M0GVZ XML Subscriber QRZ Page

    Buy the optional LDG Yaesu control cable for that tuner. It'll basically automatically do all the above as soon as you hit the tune button. Do that for several places on each band you want to use and then next time its just a case of keying up and talking and it'll pull the tuning solution from memory.
  6. KK4OBO

    KK4OBO Ham Member QRZ Page

    Lowest SWR I could get out of my AA-54 was 4.3
    Antenna is 35 feet high with ladder line hanging straight down, then coax goes straight down to the ground.
    it then travels across the ground (on top of ground) to the house approx 8 feet. Next it goes back up and into
    the soffit and into radio room approx 10 feet.
    I have checked for and shorts but all seems fine.
    I am testing on USB around 14.200 and while keying mike saying my call sign and repeating that I am testing my
    set up.
    The status of tuner looks like all kights on top bar and then all lights on bottom row blink, it happens kinda fast.
    I hope I have made it a little more clear this time.
    Again I thank you for all the help

    And I will get one of those cables, I just want to try what I have right now

  7. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Change from USB to FM and try it again.

    Tuner can't ever tune with a USB signal.

    Once it's "tuned," then switch back to USB. The optional LDG-Yaesu control cable which will allow the rig to produce a carrier when you hit the tune button is something I wasn't aware of (see post #5 above) but if that exists and works with your rig, then that would do the job also.
  8. KV4PI

    KV4PI Ham Member QRZ Page

    That's exactly where I was going too Steve. While the manual actually states you can use SSB by talking into the mic, it's much easier to keep the tuning cycle going using a steady carrier with cw, am or fm.

    Dennis, pages 16-19 of the manual will also really come in handy. It details how to read the status of the tuning cycle once completed.

    The optional interface cable is pretty nice, but not an absolute must. The one benefit it has, other than the obvious convenience of pushing a button on the face of the rig, is that you don't have to manually set the power down to Low in order to tune up. It will automatically reduce power and transmit a CW signal until the tuning cycle is complete.

    Good luck Dennis. Let us know if you get it worked out! These tuners are a breeze to use once you get them figured out..... even for dummies like me.

  9. KK4OBO

    KK4OBO Ham Member QRZ Page

    ok, tried it on FM.
    SWR lamps maxed out 3+, dropped down to 2 then back up several times.
    Pwr was 10 watts on tuner 20 in radio settings.
    So, still no working.
    Thanks for the ideas so far but please don't give up on me

  10. M3KXZ

    M3KXZ XML Subscriber QRZ Page

    Dennis, how long are you allowing it to tune? According to the manual it can take up to 6 seconds. I have an SG237 tuner and sometimes (often!) that will go through combinations for a fair few seconds trying to find a match. Sometimes I think it'll never get there, but usually it does.
  11. KK4OBO

    KK4OBO Ham Member QRZ Page

    Did it 3 times..longest was mayne 10 sec
  12. KV4PI

    KV4PI Ham Member QRZ Page

    Is 20 meters your only problem? Does it tune other bands ok?

    Don't worry..... you will get it worked out. If the issue is not the tuner, I'm sure you will find the help here on QRZ you need.
    Last edited: Dec 13, 2013
  13. KV4PI

    KV4PI Ham Member QRZ Page

    Assuming this is the LDG AT200Pro II, I would still also suggest reading page 16 and 17 of the manual.

    If the tuner won't tune, it blinks an error indication at the end of the cycle, telling you why.....

    Copied and Pasted from the manual:
    Error Indication
    When performing a tuning cycle, there are several conditions that may occur that cause the
    tune to fail. All are reported as an error, via blinking the front panel LEDs in a particular fashion.
    The following errors are reported:

    Unable to find a suitable match. Upon completing an entire full
    tuning cycle, no combination of inductors and capacitors was able to bring the SWR below

    No RF power was present at the beginning of a tuning cycle. In other
    words, the
    button was pressed to request a tune cycle, but the transmitter was not keyed

    RF power disappeared before the tuning cycle completed. You must
    continue to key the radio until the tuning cycle completes.

    Unable to determine operating frequency. In order to store a memory
    match, the frequency of the transmitted RF must be known.

    Relay protection activated. Because the relays
    may be damaged if they are switching during high power operation, software prevents the
    relays from toggling under certain conditions. Relays will not toggle if the SWR is over 3.0:1
    and the power is over 100 watts, and will not toggle if the power is over 150 watts regardless
    of the SWR.
    The diagrams on the next page show what the various error indications look like.

  14. K1BXI

    K1BXI Ham Member QRZ Page

    The G5RV will show around a 2:1 SWR on 20 meters at the end of the ladder line. You might try electrical half wave lengths of coax for 20 meters. This will change the reactive components that the tuner sees.

    Also if there is too much common mode on the outside of the coax this may upset the tuning. So a 1:1 choke at the junction of the coax/ladder line connection is not a bad idea.

    A change in coax length will not change the SWR of the system, but it will change the reactive components that the tuner sees. Of course a change in coax length may upset a different band tuning.

    Good luck...............John
  15. KK4OBO

    KK4OBO Ham Member QRZ Page

    Thanks to everyone for your help.
    Kv4pi lookz like what i was doing wrong was not keying before hitting tund key and not holdinh
    Long enough.
    Actually took about 20 seconds but swr dropped to around 1:2.

    Again thanks to all of you.
    And im sure you havent heard the last from me.
  16. NA0AA

    NA0AA Ham Member QRZ Page

    Don't be so impatient, keep the key down until the LDG stops chattering and give you the LED's to the center, per the manual - the machine switches inductors and caps in and out really fast, and the SWR moves UP AND DOWN all the time during the tune cycle, until it give you the thumbs up, then it displays the final tune result in the lower display and the power in the upper, IIRC - mine is currently in storage.

    I can take 20 seconds to achieve a match, at 20 watts, your radio is safe, so don't be worried.

    Keep in mind, once the tuners learns your antenna, it will match with SSB when at or near the learned frequencies - I 'teach' mine every band from end to end, then it retunes really quickly.
  17. K3LFC

    K3LFC Ham Member QRZ Page


    The antenna tuner must be grounded to AT LEAST A DAMN COLD WATER PIPE....USE WIRE AND AN ALLIGATOR CLIP WRAPPED AROUND coaxx connector.. To put on connector use thin rubber or electrical tape and snug it on. I had a Yaesu ft-857d before...talked alotta 75m phone band. GOOD EQUIPMENT. Photo0069.jpg Photo0069.jpg Photo0044.jpg 73s ...FCaruso909@aol.com k3lfc
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