I note that you are testing across 50 ohms. A lot of receivers are nowhere near
50 ohms resistive input.
Did you test these levels across 250 or 1000 ohm termination? Or with no
termination except the measiromg device? The levels may be quite higher and
would form the basis of Autek's warnings.
73, Guy.
>
> From: "K0FF" <K0FF@ARRL.NET>
To: <towertalk@contesting.com>
> Date: 2001/01/19 Fri PM 03:10:56 EST
> To: "Tower Talk (mail list)" <towertalk@contesting.com>
> Subject: [TowerTalk] More analyzer reading DE K0FF
>
> If anyone is keeping track of this, I tested the RF-1, RF-5 and MFJ 259 (not
> B) and found:
>
> MFJ 259...+3.5 dBm all frequencies. Quite steady ( I think the simple
> resistive bridge in there needs that constant level for accurate readings)
>
> RF-1 ...-1 dBm
>
> RF-5 .... +.5 dBm
>
> Where the untuned voltmeter is terminated across 50 Ohms. 0 dBm = 1 mW into
> 50 Ohms.
>
> I've heard the MFJ 20 over 9 when my nearest HAM neighbor was testing a 6M
> dipole I made for him. A distance of 5 miles, on little over 2 mW.
>
> As a comparison, I get a reading of 0 dBm from a 5 kW AM station, only a
> mile or so away, on my 160M sloper( measured on HP 3586 selective level
> meter). That's enough to drive my 3 knob crystal radio into distortion. So
> much in fact that it has a passive S-meter, so that I can accurately null
> out the local with a trap circuit .
> ALL BCB (AM, FM, SW) signals in total give me about +5 dBm in the shack from
> that same sloper.
>
> Happy Homebrewing, Geo>KØFF
> http://homepages.dstream.net/K0FF
>
>
>
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>
>
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