John,
The results of my newly rewired T501 measurements are a bit confusing:
- With 50 ohms on the secondary winding and the NanoVna on the primary I am getting an SWR of 2.74
- I guess this is reasonably close to the calculated SWR of 2.25? ? Due to the design of RWTST can this result be deemed acceptable?
- With 108.7 ohms across the primary winding and the NanoVna on the secondary I am getting an SWR of 4.53
- Is the math supposed to be 108.7 / 2.25 = 43.48 ohms should be seen at the secondary due to the step down?
- If that is correct, then should the SWR be 50/43.48 = 1.15 ?
- Do you have any idea why the measured SWR seems to be so far off?
- What would be the likely outcome by putting the load across one side of the primary and the center tap?
?[108.7 ohms is the closest I could get to the optimum calculated 112 ohms]
I also measured the circuit board pad output of T501 to ground and got an open (so it doesn't seem to be shorted).
[Just to confirm the output of T501 is the lower right pad with the BNC connector oriented to lower right and up]
I am very interested in reattaching T501 onto the circuit board, but I don't know how much more heat abuse the T501 board pads can take...
Therefore I want to be as sure as I can be that this transformer is wired correctly.
What advice can you offer on how to proceed?
Thank you.
Mike
