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  1. M

    2970n2 and 98vhp owners fan question

    I just acquired a heatsink amp combo off a 2970n2, repaired it etc. Now i'm thinking someone reversed the fans on this unit to pull air in?. Do your units pull air in or push air out from inside the unit. I have it up and running on a dx 959, just wondering if the fans are set backwards.
  2. M

    Uniden 980 feedback with turner mic

    Well the thing is it only does it on the later 980ssb's.....The talk back is off but you can still hear audio through the speaker faintly which is what causes issues. This is a design flaw to me.
  3. M

    IMAX 2000 best practice?

    I have setup many IMAX 2000s I open the box put em together and put em up with no adjustments and never have I had an issue and they all talk skip and hear as we'll as transmit well. Remember it also is location location location
  4. M

    Uniden 980 feedback with turner mic

    It was probably the amplifier more than the radio's fault lol...I've gotten compliments on my audio. I'm thinking I am going to have to remove the talkback circuit...kinda tough to do without a schematic as smt stuff is just cramped in there.
  5. M

    Uniden 980 feedback with turner mic

    I have a uniden 980 radio that will feedback when my turner mic is hooked to it if gain is turned past 1/6th , as well as any power mic if turned up enough. It is as if talkback is always on very very slightly. Has anyone else noticed this or is this just the current batch as I don't recall my...
  6. M

    New Refurb Dx 959 Power output choked?

    I got it ...they had a 1n4148 in where the 5.6v gate to source diode is...i dunno wtf they were thinking...I can now key and get decent forward modulation...I dropped the gate voltage to 3.5 , worked fine at 3.4 but at 3.5 ssb sounded much better and looked better on the scope.
  7. M

    New Refurb Dx 959 Power output choked?

    changed to irf520n genuine international recitifier i dunno what the hell they had in there. It swings a little better now and works a little better but still not the same...i checked gate volts 3.8 on each. i studies the schematic more..looks like the 2 diodes is to replace one with a 1.4v drop
  8. M

    Cobra 2000GTL Carbon dating

    I have one here made in 1994, it is stamped on the back serial number plate jan 1994 made in phillipines
  9. M

    New Refurb Dx 959 Power output choked?

    I just got a refurb 959, I noticed it was not up to par with my other 959's that would swing 15w out of the box and when turned up a bit 20-25 or so. First I noticed D72 has a double diode instead of single, and D71 has some kind of double diode I believe on it also. Then d145 also has a...
  10. M

    2970n2 issue

    Sounds like the amplifier is going into self oscillation... I would check the amp board to see if it has the two feedback boards in it...some of the early 2970n2's didn't and caused alot to blow up when they would self oscillate and finally destroy then it costs ya 8 irf520's lol
  11. M

    Motormouth Maul Locking Down 28 today.....

    Alot of the older ranger 2950's and 70's do that as well as many of the general lees and such...depending what channel you are on, it throws out birdies everywhere..poor design
  12. M

    Super Wack Pack II

    Radioactive used to be a good shop. Back when the 158edx first came out they set one up for me and boy was that radio LOUD but besides being loud it was clean even on a spectrum analyzer. Now....They are just looking to make a buck, I had a friend buy a 2995dx from them..while it works great and...
  13. M

    69ffc4 conversion

    Thank you very much!! I appreciate it!
  14. M

    69ffc4 conversion

    I have an opportunity to buy one of these....how is one of these converted? Is it via the ekey or just a wire.jumper.?
  15. M

    2 radios killed because of static on antenna?

    Yeah I hear ya haha..just replaced the driver and all is well...I guess I'll make sure this radio is not connected during a storm.
  16. M

    2 radios killed because of static on antenna?

    I hope it was just a fluke but for now, I'm going to say those mitsubishi devices are not the strongest....I have an imax 2000 on a tower and the whole thing is properly grounded, it must have just been the buildup of static due to lightning nearby. I know the sony icf 2000 i believe had the...
  17. M

    2 radios killed because of static on antenna?

    That is all I can think of right now is that they are very touchy , seems odd to me the 2 radios with that mosfet both die in the same night and it is a dead fet in the 200 as I checked it out...I go know that 2 legs have to be swapped as the rd16hhf1 has a weird layout.
  18. M

    2 radios killed because of static on antenna?

    Well first of all I never had an issue using my radio equipment during a mild electrical storm until today. I had a 980ssb hooked up got a phone call , came back and went to tx ..no output..the radio was hotter than hell on the back..I thought to myself..power supply..checked it..13.8v. Put a...
  19. M

    Uniden 980ssb Thoughts

    As far as ssb stability, mine does not drift from cold to warm at all...right out of the box it was dead on frequency. There is another guy running a uniden grant here and never has to retune throughout the whole night...I guess that means it is pretty stable:thumbup1: , For what it is and...
  20. M

    Uniden 980ssb Thoughts

    I tell ya, the receiver is pretty good, very sensitive, I think uniden is back on the right track.