Just to clarify, the thread title does ask about the HP 346A and so I gave estimated VSWR data for the HP 346A. The 346A has much lower VSWR than the 346B. You can typically expect to see less than 1.02:1 VSWR at 10MHz with the 346A and this will degrade to about 1.05:1 by about 300kHz. It might degrade to 1.06:1 by 100kHz.
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I did also say I couldn't remember how much worse the 346B VSWR was. I would guess that the 346B has maybe 9dB less attenuation after the diode because it has a higher ENR at its output. So the VSWR will obviously be worse than the 346A in this respect.
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