1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

Help debugging Kenwood TM-D710a dropout issue

Discussion in 'Ham Equipment' started by mmccurdy, Apr 1, 2010.

  1. mmccurdy

    mmccurdy
    Expand Collapse
    Member

    Joined:
    Jan 12, 2010
    Messages:
    10
    Likes Received:
    2
    Hoping someone can help me track this down. Over the past couple of days, my new Kenwood TM-D710a saw its first heavy use operating 2m simplex between four vehicles in a caravan.

    The issue I'm seeing is that on a fairly regular basis (maybe every 3-4 transmissions) I am getting about one second dropouts in RX audio. The S-meter also goes to zero during this time. Someone will just be talking, then nothing, then the signal and audio will come back about a second later. Highly annoying.



    We have been fairly close together, and none of the other folks are reporting any dropouts, so I'm pretty sure it's on my end.

    Other things I've been trying to eliminate: It does not appear to be correlated with physical vibration, bumps in the road, etc. It happens fairly consistently from the time I turn the rig on, so I don't think it's a thermal problem, though my cooling fan does sound a little gimpy. Besides, it's mainly an RX problem, which seems less likely to be caused by heat (right?). I believe the power to the unit is clean, though I do have it running through a relay so I can switch it with the ignition. I do not see any other symptoms that would indicate flaky power (display stays fully illuminated, etc.) The other units in the caravan are a Yaesu FTM-350 and two other identical Kenwoods.

    I'm not really sure where to start debugging here. I would greatly appreciate any leads anyone here could provide. Thanks a lot in advance!
     

  2. Moleculo

    Moleculo
    Expand Collapse
    Administrator
    Staff Member

    Joined:
    Apr 14, 2002
    Messages:
    8,807
    Likes Received:
    813
    Weather Alert turned on? Or a priority watch feature turned on?
     
  3. kd-5-bgt

    kd-5-bgt
    Expand Collapse
    W9WDX Amateur Radio Club Member

    Joined:
    Nov 10, 2007
    Messages:
    1,177
    Likes Received:
    88
    weather alert will cause that to happen,

    had the same thing happening with my icom 2200H and I had to turn off the alert system
     
  4. ke7vvt

    ke7vvt
    Expand Collapse
    Active Member

    Joined:
    May 15, 2009
    Messages:
    149
    Likes Received:
    1
    Could be that you have and APRS packet auto transmitting. If the radio transmits (APRS ~ 1 second TX) the RX on both sides turns off until the TX is done.

    Reset the radio and see if it still acts up. That would narrow it down to software or hardware problem.
     
  5. JandG

    JandG
    Expand Collapse
    W9WDX Amateur Radio Club Member

    Joined:
    Jan 31, 2010
    Messages:
    13
    Likes Received:
    0




    When the Kenwood transmit a beacon from the A-side, then the B-side is shut down for a short period for obvious reasons.

    I have two TM-D710's and they both do it as well as others I have seen.

    Hope this helps,

    Gerard
    VK2JNG
     
  6. mmccurdy

    mmccurdy
    Expand Collapse
    Member

    Joined:
    Jan 12, 2010
    Messages:
    10
    Likes Received:
    2
    Yep, this is exactly what's going on. It does make sense in retrospect, just something a little unexpected.

    Would be really nice if the smart beaconing feature were just a *little* smarter such that it waited for the radio to be idle before transmitting, but I can live with it I suppose.

    Thanks a lot for everyone's help on this.
     

Share This Page