Low Cost RF Power Meter

[VK3YNV]

Not too bad for the money, and if you arrange an external in-line attenuator to keep in the range -40 dB to 10 dB or so, it's accurate up to a few GHz.

Search for "RFpower meter 10 GHz" on Aliexpress.

100K-10GHZ N-type RF power meter V7 TYPE-C USB communication data Power TTL serial communication software FOR Ham Radio - AliExpress 1420

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[VK3YNV]

What value in-line attenuator would be needed to handle 100W? The unit appears to handle +20dB at least, and +30dB for short periods.

100 mW = 20 dB
1W = 30 dB
10W = 40 dB
100W = 50 dB
1000W = 60 dB

So +50dB in +20dB out means a 30 dB attenuator rated at 100W or better should be ok.

I think 3 or 4 of these in series mounted on a big heatsink would do the job.

10DB Attenuator 100Watt ATTENUATORS FLANGED 100Watts 10DB DC-3Ghz Full Flange 50OHM DC-3.0Ghz LOW VSWR - AliExpress 13

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[VK3ZYZ]

They look like a pretty good deal.