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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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10th Feb 2010, 7:07 pm | #21 | |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,763
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Re: Help with Eddystone 888A
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FWIW, 6dB per S-point ranges from -150dbW for S1, to -100dbW for S9. However, most amateur radio receivers/transceivers using an AGC feedback voltage derived S-meter, have meters that are very non-linear, often as little as 3dB per S-point in the S2 - S9 region. S meters look appealling, but I don't think they serve much practical purpose, certainly when amateurs give signal reports to each other, which are invariably flattering - 5 x 9 - maximum readabilty, maximum signal strength. Sometimes they gild the lilly - "10 dB over 9". Huh - what next - "wall to wall and tree top tall"? David, G4EBT |
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10th Feb 2010, 11:37 pm | #22 | |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Help with Eddystone 888A
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These receivers of yesteryear used "S" meters in such a way that the deflection of the "S" meter needle followed the AGC - which followed the strength of the carrier of an A.M. or C.W. transmission. With the slow replacement of A.M. by SSB, they have largely become obsolete - except of course for C.W. transmissions. Al. / Skywave. |
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10th Feb 2010, 11:52 pm | #23 |
Retired Dormant Member
Join Date: Mar 2006
Location: Sheffield, South Yorkshire, UK.
Posts: 1,587
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Re: Help with Eddystone 888A
Dave
I agree with your sentiments, I still like to use the "S" meter for quick checks on the receiver sensitivity often using the in built calibrator if it has one. I never take any notice of S meter reports I am more concerned that they can read me without any problems. In earlier days in my youth I remember messing arond with differing antennae being very disappointed with the "S" meter readings on received signals but extremely happy with the readability ( quiet no noise ). You soon learn by experimenting.It is like everything understanding is the key to it all Mike |