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.

dx99v2 issue

Discussion in 'CB and Export Equipment and Accessories' started by rumblefish, Feb 15, 2017.

  1. rumblefish

    rumblefish
    Expand Collapse
    Member

    Joined:
    Nov 26, 2011
    Messages:
    35
    Likes Received:
    3
    I've had this radio into the shop twice now for alignment issues. For some reason when i'm on am or fm if I tune the radio 2 khz lower people come in louder with more signal. I also come in louder and have more signal to them. ssb doesn't have this problem. The tech that work on it said it's probably due to the way the crystal is cut and the circuitry that controls it. The only other person I know who runs this radio has the same issue. Any other dx99v2 owners notice this? As far as I can remember my 949 and the older 99v didn't have this problem. steve.


     

  2. sp5it

    sp5it
    Expand Collapse
    Master of puppets

    Joined:
    Jul 9, 2009
    Messages:
    622
    Likes Received:
    188
    Looks misaligned for me.
    Mike
     
    Robb likes this.
  3. sonoma

    sonoma
    Expand Collapse
    Well-Known Member

    Joined:
    Sep 14, 2005
    Messages:
    1,198
    Likes Received:
    367
    if SSB is fine he may just need to align AM and FM a little better. this is the 1st i have heard of any one having this problem. can not see how SSB is fine and not AM. I am at a loss on this without seeing the radio. so a guess is about all I can think of.
    go along with Mike on the alignment.
     
  4. Robb

    Robb
    Expand Collapse
    Yup

    Joined:
    Dec 18, 2008
    Messages:
    9,908
    Likes Received:
    1,854
    Either/both the loop osc AM coil and AM output osc coil - are set off center freq.
    But to be ~2khz is considerably way off.

    Strange that the AM is off and SSB is correct, since AM is easier to adjust and SSB is a bit trickier to adjust.

    Just a guess; but it appears that the tech took AM for granted and focused only on SSB.
     
    #4 Robb, Feb 15, 2017
    Last edited: Feb 15, 2017
    CrazyD likes this.
  5. rumblefish

    rumblefish
    Expand Collapse
    Member

    Joined:
    Nov 26, 2011
    Messages:
    35
    Likes Received:
    3


    I've had it to two different technicians and an rf engineer. The radio is on frequency. If the meter displays 27.185, I am transmitting and receiving at that frequency.

    The engineer saw this problem first hand. He said It might be remedied by getting a better crystal for it ,but there was no guaranty
    I think if the radio was used in a mobile set up, you wouldn't notice the difference.
    I'm using mine as a base station.and the other gentlemen who has the same problem is using his as a base station also. It still doesn't make any sense to me.
    I will try to take a video of it and post it here if possible. 73
     
  6. nomadradio

    nomadradio
    Expand Collapse
    Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    597
    Likes Received:
    137
    I see a lot of radios made by RCI that have an off-frequency ceramic filter in the 455 kHz AM-FM section of the receiver.

    A signal generator that can feed 455 kHz into the receiver will reveal an off-frequency ceramic filter. Just sweep the signal frequency up and down until the noise has the lowest pitch. You'll probably find that the filter is tuned to 456.5 or 457 kHz.

    This puts the AM receiving frequency off the center of the clarifier even though all the SSB adjustments are dead on the money.

    Only cure is to replace the CFU455H ceramic filter.

    RF Parts has them, part number is "GALXFLTR-1".

    73
     
    BBB likes this.

Share This Page

Members Online Now

  1. sp5it,
  2. Sarasota Slim,
  3. 222DBFL,
  4. pencreggy,
  5. trees,
  6. 928bolo
Total: 362 (members: 9, guests: 263, robots: 90)