Re: TX protection on RX Loop

W0LEV All Messages By This Member #21122 Guessing and throwing ill conceived "fixes" at an ill defined and misunderstood problem is certainly the average amateur method of "solving" misunderstood glitches and possible damaging conditions.? Why not invest $100 in one of the NANOVNAs and actually MEASURE the isolation over frequency between antennas.? Then you will 1)? solidly conclude you do or do not have a potential problem, and 2) you will know how much protection is required, if any.? Hopefully, one can add and subtract (grade school exercises) simple values of attenuation.?? Dave - W?LEV toggle quoted message Show quoted text On Fri, Feb 28, 2025 at 7:51?AM Fred M via <dl4zao=[email protected]> wrote: On Fri, Feb 28, 2025 at 01:55 AM, <biastee@...> wrote: I have seen hams using 1N4007 for attenuating and switching, but I think it is premature to decide on a suitable application without first measuring the minority carrier lifetime. Or has someone already measured them? Sure, there are several measurements available in the web: ? The use of an 1N4007 as P.I.N. diode for low frequencies is also well documented ? QRP-labs is using 1N4007 as a PIN diode substitute in its successful QDX digital TRX https://qrp-labs.com/images/qdx/schem4.png ? -- Dave - W?LEV

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