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Recent content by Turn it to the right

  1. Turn it to the right

    Help Identifying this amplifier

    I don’t know. Only have this picture. No more information on it.
  2. Turn it to the right

    Help Identifying this amplifier

    Anyone seen one of these? What are it’s specifications?
  3. Turn it to the right

    Tuning the MFJ SPT500 Super Penetrator

    Ok on the math as that's not the overall issue. Ok on the SPT500 from 1976. Now let's talk today's SPT500. First matching network is physically smaller in overall dimensions and attachment to Gnd plane and driven element is slightly different. Bottom insulator is clocked different. Overall...
  4. Turn it to the right

    Tuning the MFJ SPT500 Super Penetrator

    Ok took mine down and tried your measurements. Results were very poor. Antenna at 23' without capacitance hat has too much inductive reactance. Now granted my SPT500 has an enlarged matching system so this maybe a possible reason I couldn't duplicate your findings. Anyway I did further tweaks to...
  5. Turn it to the right

    super penetrator 500

    Normal. If you watch the swing you can compensate by shifting your center frequency to minimize the shift or use an antenna tuner to at least protect the exciter. You tuned your SPT500 for which band?
  6. Turn it to the right

    Tuning the MFJ SPT500 Super Penetrator

    Never got it resonant but the feed point resistance was low enough with the given reactance to achieve a 1.3:1 but the bandwidth seem to suffer. Centered about 27.455Mhz is where it was about 1.3:1 VSWR. New matching network solves this and now your 1.5:1 VSWR bandwidth is over 600khz with the...
  7. Turn it to the right

    Tuning the MFJ SPT500 Super Penetrator

    Kinda getting off the topic. First S-meter readings are relative and not absolute. Maybe a little subjective depending on who's looking. A true 5/8 GP tuned properly should present about 3Dbd of gain. So the EIRP is effectively double the RF applied. Now granted these cheap CB S-meters are...
  8. Turn it to the right

    Tuning the MFJ SPT500 Super Penetrator

    Yes still using capacitance hat as it necessary for keeping the feed point resistance fairly consistant. I found anything over 23' on the driven element as measured from top of the bottom insulator could not be tuned for near 0 reactence. Always too inductive as shown by both the MFJ269 and...
  9. Turn it to the right

    New Super Penetrator 500

    i have tried to tune these new Hygain SPT500's for use on 11 meters with marginal results. The existing matching network used by Hygain on these antennas needs modifications to tune properly for 27Mhz. Just look at a picture of the original Super Penetrator and you'll observe a noticeable...
  10. Turn it to the right

    Tuning the MFJ SPT500 Super Penetrator

    Attempted tuning on 11 meters using MFJ269C. Antenna reactance with existing Beta matching shipped with these new SPT500's is poor. I did manage to get close to 1.3:1 but the bandwidth seemed to narrow. Others on this and other forums have noted the significant difference in the matching network...
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    DEI Transistors

    I own both a TS Sweet Sixteen with Toshiba transistors and a newer unit with the DEI transistors. Running both at 14 vdc there's about a 150 watt difference in output with the same drive level into a 50 ohm dummy load. DEI's draw less current. Running the collector voltage to 15.5 vdc the...
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    DEI Transistors

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    Purchased new Texas Star DX1600X

    Yes 15.5vdc. Using a Ranger 6900F 150 to excite the DX1600X. My SWR at the output of the amp is 1.06:1. Amp input tuning is very good. Voltage drop is .07 vdc at 1400 watts output. No issues with the DEI transistors. I know of several folks running 16 vdc on this and the TS SweetSixteen with no...
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    Purchased new Texas Star DX1600X

    Hello all just wanted to give a short review of this brand new Texas Star DX1600X. In a word fantastic! Yes it has the DEI 2SC2879's. It is very well made with very good parts and very good soldering. Modification is necessary before it will operate, but it's a very simple modification. Not the...
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    Antenna Painting ?

    Don't use chrome paint as it has some conductive stuff in there, but it looks good on the Harley approved verticals.............