Home › Forums › temp › SSTRAN Now Accepting Orders for the New AMT5000 High Efficiency AM Transmitter Kit › Action Central
Total posts : 45366
Encouraged by solving the “how to get a peak” situation, I will now conduct a comparison test between the AMT3000 and AMT5000. It will only be semi-scientific, but I will describe significant steps so that maybe we will be able to end up with a rough sketch.
To begin with, my antenna is “unapproved” in the real technical world, but it does the job I want it to do. The point here is that it is NOT an ideal antenna, and therefore the field of measurement will be in a smaller area than would be expected with a great antenna. There is no point describing the antenna in detail. The main thing about it is that it is less than perfectly efficient.
This morning I attached the AMT3000 and tuned it by setting my Zenith Transoceanic Radio for Manual RF Gain, turned the RF Gain down until I could just barely hear my signal at 1550kHz. At first the transmitter output tuning range was set for 82uH, an ordinary setting for this frequency. I tuned C5 until I heard the signal on the Zenith jump up to a louder level. But I noticed that C5 was fully inter-meshed, and changed the RF jumper range to 56uH, and was able to get an even louder RF level from the Zenith with C5 more in the middle of its range.
In a short time I will drive away, noting the distance not in feet, which would only be a wild guess, but in terms of “lots,” or “households.” I will be driving west, and in the past I have heard the signal at 1550 for a distance of 3-lots plus one cross-street.
But we are starting fresh with a newly modified antenna and a better-tuned AMT3000. The result could be different from before.