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Texas Star DX500V how much drive?

Discussion in 'Amplifiers' started by TruckerKevin, Jun 28, 2019.

  1. TruckerKevin

    TruckerKevin Active Member

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    Hello fellow radio chaps

    I have acquired a Texas Star 500 (does NOT have the variable dial on it.) It is old, but clean.

    I currently have it hooked to my Galaxy Saturn on a 60 amp power supply.



    I do NOT want to burn this thing up. My radio dead keys at 3 watts and swings to 8 watts on rf power turned all the way down on low without the amp on.

    I have read that these Saturns should swing to more. That is the most I can get out of it adjusting the high then low pots.

    With the amp on, My meter shows a dead key of 200 watts and swings to 300.

    Does this sound about right? Just looking for some experience to chime in here. Pretty much a noob with amps.

    Oh, I do have the fan kit to keep it cool

    Thanks again
     
    #1 TruckerKevin, Jun 28, 2019
    Last edited: Jun 28, 2019
    Shadetree Mechanic likes this.

  2. 999

    999 Well-Known Member

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    What meter are you using? What power supply are you running?
     
  3. TruckerKevin

    TruckerKevin Active Member

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    The meter is an MFJ 868B, (the large one) and the power supply is a Delta 60 amp
     
  4. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    The website says it will do 500w with a 20w input. That being said, people put them behind the Stryker 955 and they seem to take it ok. I would only give it about 40w like a Galaxy 99v. You should be able to give it a little more peak but it would be nice to keep the dead key low so it is only 1/4 of the peak.

    http://www.texasstar.com/export/specifications.html
     
  5. TruckerKevin

    TruckerKevin Active Member

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    There’s no way I can get mine to do 500 watts. I can’t even get 250 on an 18 watt dead key.

    I searched for that info last night but couldn’t find it Shadetree. Thanks for digging it up
     
  6. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    No problem TK, I think the transistors are rated for 10w pep input and a 1w dead key each. I run a 350HD on my President Madison with a 3w dead key swinging to about 16w peak. The amp outs out about 150w dead key and almost 400w peak.
     
  7. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    Also something to check is the SWR between the radio and amp. My 350 had crazy SWR on the input and I had to replace an input tuning cap with a variable cap to get it right.
     
  8. TruckerKevin

    TruckerKevin Active Member

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    Hmmmmmm That’s a good point. I know something has to be wrong somewhere because I really think this amp should be putting out a whole bunch more than what it is
     
  9. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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  10. NightThumper

    NightThumper Active Member

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    The last Texas star 500 I had with Toshiba transistors did the following: With a 1-2 watt dead key swinging 30-35 watts at 14 volts showed 600 PEP bird.
     
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  11. TruckerKevin

    TruckerKevin Active Member

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    There’s no way mine is getting that kind of output. Unless my meter is really messed up
     
  12. NightThumper

    NightThumper Active Member

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    Your MFJ meter isn’t a bad unit. It only gets a 3.5 rating out of 5 on Eham.net. Reading the reviews one stated it was 10% off others claim it’s dead on. Even if it was 10% off you should be seeing higher numbers.
     
  13. TruckerKevin

    TruckerKevin Active Member

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    I just talked with some people far away. About 55 miles north of me. After fine-tuning, they said I sounded nice and loud and clear and was not clipping anymore with my amplifier turned on and my RS power turned all the way down .

    My radio dead keys around 4 watts and only swings to about 7 on my meter turned down. With the amp on I dead key about 200 and swing to 250 or so, these numbers fluctuate a tad bit .

    Maybe there isn’t an issue here?
     
  14. 543_Dallas

    543_Dallas Sr. Member

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    There used to be a chart on the Texas star website that showed the expected output power at different drive levels but I wasn't able to find it. Maybe its in the manual if cbtricks.com has it.You're making about half of the rated power with less than half of their 20 watts input power so it seems like the amp is ok.

    Can you borrow another meter? It almost sounds like the pep function isn't working properly. I would think the saturn would do 15 to 20 pep easily.
     
  15. 543_Dallas

    543_Dallas Sr. Member

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    Your radio is a saturn and not a Saturn turbo correct? The reason I ask is a friend had a turbo that he tried to turn down to drive an amplifier. When the carrier was turned down so low it had very weak modulation. He had to disconnect the internal amp in the Saturn turbo to make it play.
     
    Shadetree Mechanic likes this.

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