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#11
November 17th 07, 11:18 PM
posted to rec.radio.amateur.antenna
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Low Noise receiving Loop antenna
Owen Duffy wrote:
Tony Giacometti wrote in news:suednRqSYJd58aLanZ2dnUVZ_uDinZ2d@hawaiiantel. net: also, if these loops don't work then why do these designs exist? Tony, A few questions: 1. With a 50 load on the preamp input, when tuned to a quiet spot in the band, RF gain full, preamps on, telephony bandwidth, does the S meter deflect at all? not noticeable 2. If no s meter deflection, note the receiver audio output voltage. 125mv 3. With the loop connected on the preamp input, when tuned to a quiet spot in the band, RF gain full, preamps on, telephony bandwidth, does the S meter deflect at all? not noticeable 4. If no s meter deflection, note the receiver audio output voltage. 150mv 5. What is the ratio of the voltage at 4 to the voltage at 3? If it is more than about 3:1, you have achieved nearly as good a S/N ratio as is possible. Owen |
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