>Thank you, gentlemen, for your responses re my questions pertaining to the
>suitability of a transformer with a 106 Ohm secondary at 5300 volts and a
>120 volt primary. BTW I rechecked the primary resistance and it appears to
>be about 0.1 Ohms + - .
>
>My next question is, what would be considered a decent secondary
>resistance at that voltage?
>
? 106-ohms is decent for some finite load R, depending on the
rectification circuit used.
- For FWD service, using a C-filter, multiply the secondary R by a
constant of c. 300 to arrive at the usuable intermittent load R for SSB
service. 105-ohms x 300 = 31k-ohms. The output V in FWD service is c.
2.5DCV per RMS volt of AC input, so the under load potential would be 2.5
x 5300v or c. 13,000V. The safe load R = 13,000v/31,000-ohms = 420mA.
- For FWB service using a C-filter, the output V is c. 1.3 x the RMS
input V, or c. 6900V, and the safe load R is approximately 70x
thesecondary R. 70 x 106-ohms = 7400-Ohms. The safe load R is
6900V/7400-ohms = 900mA. However, these ratings only apply to
intermittent SSB service. For RTTY service, divide the current
calculatioms by c. 2.
>Actually that voltage is a bit high. What if I used a full wave ct
>rectifier scheme? Then the voltage would be about half and the secondary
>resistance would also be 1/2. Would a 53 ohm secondary be considered
>suitable for a 1500 watt amp?
>
6900V is ideal for an 8166/4-1000A amplifier.
>Since I have access to all the winding leads, what if I paralleled the
>secondary windings and used a bridge rectifier? Now the secondary
>resistance would be about 26 Ohms.
>
3500V would work with an 8877, 4-400As or 3-500Zs.
>...
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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