I meant -- how does the VNA work in the presence of strong AM signals. My
vertical has worked great when used as an antenna on 160 for the past 30
years. I know how the vertical works.
K4TO
On Fri, Nov 30, 2018 at 8:17 AM Herbert Schoenbohm <
herbert.schoenbohm@gmail.com> wrote:
> I am within 3 miles from a 5KW AM station on 970 kHz without a problem. I
> do pick up the second harmonic on 1940 but never go that high in the band.
> You may have second or third harmonic IX but that depends on the AM
> frequency. If the AM station, for example, is on 610 kHz 1830 kHz will be
> bad for you for 5 kHz each side of their harmonic.
>
> Herb Schoenbohm, KV4FZ
>
> On Fri, Nov 30, 2018 at 8:50 AM Dave Sublette <k4to.dave@gmail.com> wrote:
>
>> Any info on how it might do on a quarter wave vertical for 160, operating
>> within two miles of an AM broadcast station?
>>
>> Dave, K4TO
>>
>> On Fri, Nov 30, 2018 at 4:28 AM Jim Brown <jim@audiosystemsgroup.com>
>> wrote:
>>
>> > Here's another nice new toy from DL-land by way of the UK. The designer
>> > is DG5MK.
>> >
>> > https://www.sdr-kits.net/VA5_Page
>> >
>> > $235 got the analyzer and a better quality cal kit shipped to my door
>> > just before CQWWCW. The better Cal kit was $20 of that cost. It took
>> > less than two hours to put it together (as I get older I get slower).
>> > It's a single-port true vector analyzer, and runs either stand alone on
>> > two internal AAs or from VNWA software via a USB port. Decent build
>> > quality, BNC is soldered to the board and bonded to the case at the
>> > point of entry. The case is a 2-piece metal clamshell, screwed together
>> > at four places. In other words, it's well shielded and has no Pin One
>> > Problem!
>> >
>> > There's a beautifully printed manual that covers building and operation,
>> > with excellent color photos. Text is excellent in the building section,
>> > pretty good in the button-pushing area, a bit weak in the concepts area,
>> > and badly disjointed to point of being awful in its description of
>> > calibration. The latter is a big deal, because it's the first thing you
>> > do once you turn it on!
>> >
>> > As near as I can tell,when running from VNWA software (FREEWARE), it can
>> > do almost everything the VNWA can do with S11 (single-port)
>> > measurements, except that choices of sweep rates and dwell time at each
>> > data point are a lot more limited. That means I can use the excellent
>> > TDR function built into the VNWA software! I don't know yet if I can
>> > import complex data made stand-alone. BTW -- the measurement plane is at
>> > the end of a 5 ft piece of RG142 from my stash. I find that a convenient
>> > length for getting to where I can measure antennas from my shack.
>> >
>> > This box is designed to be the one you use in the field and at the top
>> > of the tower, but with the VNWA software, you can make measurements in
>> > the shack, including TDR, then export antenna data to SimSmith to
>> > transform it to the antenna ffeedpoint, then use SimSmith to design
>> > matching networks and compute loss in the feedline and matching
>> networks!
>> >
>> > This is a VERY nice unit, and a real bargain!
>> >
>> > 73, Jim K9YC
>> >
>> >
>> > _______________________________________________
>> >
>> >
>> >
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>> >
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>>
>>
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>
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