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 audio voltmeter to the audio out on the receiver.
Have the other station transmit a carrier and switch the amp in and out.
You will be able to read to better than .5 db signal difference on the
audio meter and it is quite linear.
But you must be able to disable the agc or it won't work.
73
Gary K4FMX
Joe Isabella wrote:
> 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 level is always hotter.
> I've always dismissed it for crappy S-meter linearity, but who knows...
>
> Joe, N3JI
>
>
> David Kirkby <david.kirkby@onetel.net> wrote:
> John T. M. Lyles wrote:
>
>>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
>>appeared. They were using the full 960 kW beam,
>>from 4 -6 MHz, with 7.5 seconds on and then 7.5
>>second off time. Operating QRO. Look it up, its
>>pretty neat. I have a text version I can forward
>>upon request.
>>73
>>John
>>K5PRO
>
>
> 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 non-linear change in received signal as the transmitter
> power is adjusted. I'm still highly suspicous of Rich's claims, but are
> a little less inclined to totally dismiss them now.
>
> Clearly if the could visually affect the aurora, it is possible it
> would have had some change on its radio properties.
>
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