| Electronics > Repair |
| Boonton 41-4B power sensor repair advice |
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| xrunner:
--- Quote from: edpalmer42 on October 31, 2023, 08:25:46 am --- Being able to see the wire at the end of the pin tells you little about whether you got a good joint or not. --- End quote --- Well let's move on, but seeing the solder work even at the end of a pin like that is better than not seeing it. Seeing something is better than seeing nothing. That's been my avowed policy for quite a number of years. :P Anyways ... here's the input impedance plots from both Boonton sensors I have. The top plot is a Boonton 41-4A which to my knowledge is original and not repaired. The bottom plot is the repaired 41-4B. Smith chart and S11. Draw your conclusions as you will. :popcorn: |
| factory:
Another Boonton 41-4B power sensor, this one is a little older than the one repaired in this thread, it came with a 1970s 42AD microwattmeter. I'm going to need to do some surgery to this one, as there is a short across the input capacitor, this is the one between the 100Ω resistors & the two diodes, to me it looks as if someone made some repairs and accidentally shorted it with solder. It would be interesting to see if anyone else has an older 41-4B & some pictures of the insides for comparison. The sleeving for one of the output leads needs replacing too, it's worn through where it goes into the connector section, this was intermittently shorting on the casing. David |
| xrunner:
This will be a good contribution to the thread. I'll be watching with great interest. :popcorn: |
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