off its battery. On its fundamental freq and harmonics, the radio will
hear it as an unmodulated carrier.
the same room, typically due to RF coupling to the mains power lines.
a 60 Hz ground loop between it and the radio.
On 4/21/2011 12:03 AM, Edward R. Cole wrote:
> Wayne,
>
> I connected the XG3 directly to my sub-Rx via the aux ant and the
> signal is a clean CW note. I did a quick calibration check at 14.020
> with -73 dBm and s-meter reads S-8 so pretty good (uncalibrated since
> I got the radio a year ago). I did another test transmitting 0dBm
> thru the air and can see that it is 60-Hz hum from something (I hear
> the CW note in there). I checked for ripple on my bench PS and see
> nothing at .005 with the scope. It ran for about half an hour with
> no detectable drift in the tone frequency. That is impressive
> considering the K3 has the K3EXREF.
>
> I wanted to report back so that my earlier report was not seen as a
> negative about the XG3. BTW be careful switching to -33 dBm into the
> K3 it really clears out the dust in the speaker. Running -107 dBm
> shows S-2 (36 dB less than S8). That really shows off the linearity
> and accuracy of the K3 s-meter. I set up all the recommended
> settings for receiver sensitivity measurement.
>
> Later I will connect my Sinader meter to do a S+N/N measurement on
> 28-MHz (my freq of interest as IF for 2m and 1296 transverters). Be
> interesting to compare with the internal audio meter in the K3. I
> will also compare the XG3 with my 1296 signal source.
>
> XG3: very nice!
>
> Ed - KL7UW
>
> ------------------------------
>
> Message: 44
> Date: Wed, 20 Apr 2011 17:30:30 -0700
> From: Wayne Burdick<
[hidden email]>
> Subject: Re: [Elecraft] XG3 Arrived
> To: "Edward R. Cole"<
[hidden email]>
> Cc:
[hidden email]
> Message-ID:<
[hidden email]>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> Ed,
>
> You should not hear a hum or buzz when listening to the XG3 on a
> receiver. The fact that's it's not a sinewave doesn't mean that it has
> audio-frequency modulation; it is a pure carrier. You might be hearing
> 60-Hz pickup due to the lack of a common ground, etc.
>
> Wayne
> N6KR
>
>
>
>
>
> 73, Ed - KL7UW, WD2XSH/45
> ======================================
> BP40IQ 500 KHz - 10-GHz www.kl7uw.com
> EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter?
> DUBUS Magazine USA Rep
[hidden email]
> ======================================
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