Posted by
Dick Dickinson on
Aug 28, 2010; 5:38pm
URL: http://elecraft.85.s1.nabble.com/Need-K3-dB-Measurements-on-new-160M-Antenna-tp5468244p5473159.html
Jim -
Give www.w4mq.com a try!
73,
Dick - KA5KKT
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On 19:59, Jim Brown wrote:
> Crew,
>
> I've put up a pair of new antennas for 160M that are predicted to have
> about 3dB of gain over my existing vertical. Without going into a lot of
> detail, each antenna is a wire sloping off of my 120 ft tower, one going
> east, one going west. The tower acts as a reflector. The tower and each
> wire have 4 elevated radials. The antenna is working -- I've made four
QSOs
> with VK, one with FK8, and one with FO in about two hours -- but I need to
> figure out if it's working better than my existing omni vertical.
>
> By doing a lot of listening, I can clearly confirm the predicted 6dB or so
> of front to back, but QSB makes it hard to get a handle on gain, and I'm
> only expecting 2-3dB. That's where the dB meter in the K3 comes in handy.
>
> My method is to key down on one antenna for a while, let you get a
reading,
> switch to the other and do the same, then back and forth between them,
> again for long enough for you to get a good reading. There IS a lot of QSB
> on the band, so you'll need to do a lot of mental averaging. Please let me
> know, OFFF THE LIST, if this is something that you would like to help me
> with. I need reports from stations that are between about 30 degrees
> azimuth and 120 degrees azimuth of my QTH south of San Francisco. In other
> words, my antenna is aimed at about 75 degrees (ENE), and I need reports
> that are within 50 degrees of being on axis. I could also use measurements
> from KH6 of the antenna that goes in that direction.
>
> BTW -- to access the dB meter in the K3, you need to hit the Display
button
> once, then rotate the second VFO knob clockwise until you see a reading in
> mV. Let the knob in that position for about 15 seconds, then rotate it one
> more position clockwise. Now, the dB reading will be relative to whatever
> the average IF output was when the knob was in the mV position. Note also
> that the reading goes plus and minus.
>
> 73, Jim K9YC
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