Hi Dick, The Elecraft list does not accept attachments. Send to me directly.
John KN5L On 12/2/18 4:14 PM, Dick Dickinson wrote: > Hi John, > > Per your suggestion, I ran a sweep of my 40 meter vertical with the K3 / > K3EZ software. > > I then measured at ~20 kHz steps with my MFJ-259B. > Both sets of measurements were taken from the PL-259 that plugs into the rig > or 259B. > > Conditions were ~60 degrees F, ground nearly saturated. > > Attached is an image of the results. > > Kindly, > Dick - KA5KKT > > ---------------------------------------------------------------------------- > ----------- > > Hi Dick, > > An EZNEC and SimSmith model of the on ground 1/4 wave vertical: > https://www.kn5l.net/images/SS-KA5KKT-vertical.png > > SimSmith R1 represents ground loss, the value set to establish a 50 ohm load > at the transmitter, G in SimSmith. > > According to the models, the 7 to 7.3 MHz SWR is a little below 1.3. > > A flat measurement using the K3 SWR meter seams reasonable. My suggestion is > to use a Antenna Analyzer to measure the antenna and system. > > John KN5L > > On 12/2/18 12:16 AM, Dick Dickinson wrote: >> I have a full-size monoband vertical for 40 meters. Simple >> architectural aluminum tapering from 1 �� (?) in 6� telescoping >> sections. The radial field is designed to provide a 50 ohm match at >> the feed point�12 � 13�+ radials. It is fed directly�no matching >> device with RG-213 from the remote antenna switch about 50� away at my >> tower. The coax from the rig to the remote antenna switch is >> estimated to be ~ 50� in length. A lot of the time running K3EZ to >> sweep the band (typically 20 watts), it will indicate a >> 1.0:1 SWR from 7.0 MHz to 7.3 MHz in 20 kHz steps. Occasional >> deviation from one K3EZ run to another might be due to variations in >> moisture content of the ground or less than perfect connection to the >> vertical�an uncommon situation. The K3 shows the same readings. >> >> Is this 1.0:1 SWR across the entire 40 meter band curious or remarkable? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
