Er...one moment, please.
The gentleman who wrote that, and, might I say, the engineer or
academic who might favor that approach, does not have dirt under the
finger nails. The hard fact is that in Big City; saturated as it is by
truly stupendous microvolt per meter levels from a.m. broadcasting,
television broadcasting and no end of communication services clamoring
to get in; a non linear stage like that ahead of the receiver is a
mixer. That the diodes are not conducting does not mean that there is no
mixing going on.
Yes, those without practical experience of the elevated noise floor,
up and down the h.f. bands, that such an arrangement produces will be a
hard sell but the mixing effect is no less real.
John
at radio station VE7AOV? ?
On 2019-09-20 4:35 a.m., erik@... wrote:
slide 11
Simple and cheap: Back to back diodes
? Protection not dependent upon configuration
? Diode type is not critical (except, don¡¯t use PIN diodes)
? Limited to low input power levels => receive only applications
? +30 dBm = 1 watt max (when using ? watt diodes)
? If either diode fails open => receiver front end not protected
? Spurious signals in receiver can be a problem
? Some mfgs offer choices on spurious levels (DX Engineering RG-5000 series)
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