Abbreviation for RL-Monitor ＝Reverse・Look・Monitor(Reverse side direct viewing device).
This is the logo mark (the currently popular emblem) of this machine.
It was designed by a local station.
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Abbreviation for RL-Monitor ＝Reverse・Look・Monitor(Reverse side direct viewing device). This is the logo mark (the currently popular emblem) of this machine. It was designed by a local station. |
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December 25, 2015: Cases arrived,
boxed and ready
November 8, 2015: Design/production completed. The case is still in production and not yet completed, but the contents are complete. Some constants have changed, so the documents have been updated.
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| Basically, I use parts that can be purchased online. A mixer is required for TX-MODE and a modulator is required for RX-MODE, but since the analog SW requires the modulator's carrier balance to be performed at two points, I decided to use an analog modulator/mixer. Since 612/614 etc. are difficult to obtain, I used NJM2594, which is also an old IC but is still available online. |
| As the name suggests, SSB (Single Side Band) signals are ideally centered around the carrier point, with only the LSB (lower side signal) and only the USB (upper side signal). However, when generating SSB signals using PSN technology these days, especially when using analog PSN technology, the phase and amplitude conditions must be satisfied within the passband. However, when actually creating a signal, it is difficult to satisfy the phase/amplitude conditions within the passband, for example, from 100Hz to 3KHz. Because this amplitude/phase condition has a frequency characteristic, the opposite side characteristics actually become unstable. Most people who have made a signal have probably experienced this, but it would be good if the characteristics were theoretical during adjustment, but they have various slope characteristics, and when this happens, you get stuck in a rut and can't get out. It is hardly noticeable in actual use, but it is not interesting mentally. This device was created as a tool to directly view the opposite side band characteristics of the transmitter/receiver. |
| specification １. There are three modes: TX, RX, and SG. TX-MODE = When looking directly at the characteristics of the opposite side of the transmitter. RX-MODE = When looking directly at the characteristics of the opposite side of the receiver. SG-MODE = Used as a general-purpose signal generator. ２. In TX mode, the AF output is maximum 2Vpp, variable by VR. The optimum input level for the TG is set by the VR while watching the display. ３. In RX mode, the MOD output is fixed at -10 dBm. The optimum level of the AF input is set with the VR while watching the display. ４. In SG mode, output is fixed at 0 dBm for frequencies from 1 Hz to 30 MHz.   Block Diagram |
| September 13, 2015 Measurement results in TX-MODE (TX-Uranus reverse side characteristics) |
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TG-OUT signal OUT signal (right) when Center=3.602MHz, Span=5KHz, Resolution=30Hz = 2.5KHz-0-2.5KHz repeating signal. Maximum 2.2Vpp |
Click on the image below to play the video. |
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As expected, the opposite side
characteristics of the hybrid type transmitter (TX-Uranus) are
outstanding. (Excessive quality) Please refer to the direct observation results below. |
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| Center=3.602MHz、Span=5KHz、resolution＝30Hz | Center=3.602MHz、Span=10KHｚ、resolution＝30Hz |
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| October 9, 2015: Now that this year's rice harvest is over, I'm going back to designing this machine. This machine is effective for homemade PSN machines, and I adjusted and checked the 455KHz PSN detector characteristics using a 6-stage (-70dB) all-pass filter in RX-MODE. I'm trying to get champion data for a 455KHz PSN generator using a 6-stage all-pass filter (-90dB) in TX-MODE. |
| The theoretical characteristics of a 6-stage all-pass filter, and below are the results of adjusting a 455KHz PSN detector using this. |
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| Reverse side characteristics without adjustment | Adjusted opposite side characteristics |
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October 12, 2015 Challenge of 8-stage -90dB all-pass filter |
| Someone (JA4ABY) once brought me a champion data (instantaneous maximum wind speed) for the opposite side direct view data with an 8-stage -90dB all-pass filter and showed it to me, so I tried to compete somehow. I tried with an 8-stage -90dB all-pass filter attached to a 455KHz-PSN generator, but no matter how many times I tried, the champion data was as follows. I tried to avoid looking above 90dB, but it was impossible. The average was -85dB. I'm impressed that I was able to do it. From this, the hybrid machine is stable and wonderful. |
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