There is an Interesting paper in Nature (#433, page 498-500, 3 Feb, 2005) in which high power HF radio transmissions from HAARP were used to cause visible changes in the aurora, where speckles appear
An intereting paper. I downloaded the PDF from the Nature site, where of course you can see the graphs and pictures. It does give some credability to the people like Rich who has said he has observed
While I have yet to measure it with an accurate tool, I have yet to see a 10dB increase in power give only a 10dB increase at the receiver. It seems that whatever the increase is, the received signal
But if you rely on S-meter calibration, you can't draw any valid conclusions. PERIOD. Rich has given a more detailed analysis, based on the use of calibrated attenuators. I still feel he is wrong, an
An easy way to measure pretty close: You need a receiver that you can turn off the agc. Get a good audio voltmeter like an HP 400E with a nice db scale. You can find them for $10.00 or so. Hook the a
Which is why accurate readings are done with a calibrated step attenuator - using the S-meter only as a relative indicator. The most accurate S-meter that I ever encountered was on a TS-820S. Richard
But you must be able to disable the agc or it won't work. You must also make sure that the receiver audio dynamic range is sufficient. F'r instance, if the the AF output is set to 50mW without the am
Which is why accurate readings are done with a calibrated step attenuator - using the S-meter only as a relative indicator. But what is the resolution of the S meter? Most S meters have S9 at half sc
With the AGC off, and the RF gain backed down, there's plenty. The step-attenuator method is the gold standard. Richard L. Measures, AG6K, 805.386.3734. www.somis.org ________________________________
With the AGC off, and the RF gain backed down, there's plenty. I don't see it. If you have a meter that at S9 is reading half scale, and you want to reset a signal level to1 dB, you need to be be abl
With the AGC off, how does your S meter function at all? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
With the AGC off, even a 1db change makes a noticable change in S-meter deflection. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing
When the RF gain is backed down and the AGC off, the S-meter reads on-scale. For receivers that don't have an AGC switch, forgetaboutit. cheerz, Gary Richard L. Measures, AG6K, 805.386.3734. www.somi
When the RF gain is backed down and the AGC off, the S-meter reads on-scale. So what drives the S meter if there's no AGC? I haven't seen an rx yet that had a functional S meter with the AGC off. Ple
What kind of receiver do you have that the S meter gives signal strength response on with the AGC turned off? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@cont