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Author Topic: Watt Meter Replacement Diodes  (Read 3793 times)
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W8UJX
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« on: December 19, 2012, 07:20:32 PM »

I have a Yaesu YS-500 SWR/Watt meter.  The meter covers 140 to 525 MHz.  The diodes in the RF pickup section are burned out.  The schematic only shows a block for this section and does not give a part number for the diode.

Does anyone have a sugestion for replacement diodes?

Thanks,
Jerry, W8UJX since 1954
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KM1H
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« Reply #1 on: December 19, 2012, 09:00:59 PM »

Likely a matched pair of germanium similar to the 1N60, 1N191, 1N270, etc. A pair of modern Schottky should work and they will have zero leakage and be well matched, 1N5711 is a common one I use everywhere in place of germanium.

Carl
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Steve - K4HX
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« Reply #2 on: December 19, 2012, 09:02:40 PM »

Did you call Yaesu repair? The diodes in the YS2000 are 1N60s.
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W8UJX
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« Reply #3 on: December 19, 2012, 10:13:31 PM »

Why didn't I think about calling Yaesu...  I will give the 1N5711 a try and if that doesn't work I will  give Yaesu a call.

I need to order some diodes that I can use in broken watt meters and other RF projects.  The 1N5711 looks like a good candidate.

Thanks,
Jerry
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Steve - K4HX
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« Reply #4 on: December 19, 2012, 10:53:49 PM »

I haven't called them recently but in the past they were very helpful. I was asking for info and parts on much older radios, FT101 and FT102.
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