| Electronics > Repair |
| Wiltron / Anritsu 69147A 20 GHz Sweep Generator - Error 113 YIG Loop Osc Failed |
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| EggertEnjoyer123:
I'd suspect the amplifier. Since everything is relatively low frequency (before the SRD), you can probably use a scope to check whether the amplitude is increasing after each amplifier. What is probably happening is that one amplifier IC has failed, and the output of the sampler is too low for the loop to lock at some frequencies. The sensitivity varies a lot for the PLL, and generally some frequencies would lock and others wouldn't. I had a similar issue in one of my RF generators where some frequencies wouldn't lock and some would, and it turned out to be a dead RF amplifier. |
| metrologist:
--- Quote from: metrologist on September 13, 2024, 09:29:13 pm --- A7J1 goes to U8 MAR-3S -> U9 MAV-11S -> U10 MSA0520 -> J4 to the sampler. J2 and J3 are +/- IF --- End quote --- It should work with -4dBm input to U8 +10dBm out, U9 +17dBm, U10 +23dBm Low noise supplies are +10, +10, +15V |
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