For the QSO TodaY Expo, the login is the email address that you used when you bought your ticket.
Sent from my iPad > On Mar 22, 2021, at 9:17 PM, Rick Hiller via BVARC <[email protected]> wrote: > > I paid $10 months ago, but for the on demand stuff I do not know. The BVARC > NEWS BLAST from yesterday has info on how to get to the site so the sign in > might tell you. > > RH > > On Mon, Mar 22, 2021 at 8:45 PM Mark Brantana via BVARC <[email protected]> > wrote: >> What is the price of admission? >> >>> On Mar 22, 2021, at 7:37 PM, Rick Hiller via BVARC <[email protected]> wrote: >>> >>> Mark, >>> Have a read in an ARRL Antenna Handbook about antenna measurements, test >>> site set up, absolute gain and pattern measurements. Might shed some >>> light on your project. >>> Also near field versus far field distances and characteristics. >>> >>> That forum’s presentations are on demand online until April 15th. Working >>> my way thru. I’ve only seen a few so far. >>> RH >>> >>> >>> On Mar 22, 2021, at 5:32 PM, Mark Brantana via BVARC <[email protected]> >>> wrote: >>> >>>> FSD = Field Strength Drone >>>> >>>> We have had some fun discussions about this idea. I wish I could have >>>> visited the forum held recently, but I had to miss it. I understand >>>> someone had someone talked about a related topic, and I have looked at the >>>> article Jeff kindly sent me. I hope I did not miss anything else, but I >>>> have tried to read and follow up on all the comments. This educational >>>> jaunt has given me some help in better understanding field strength meters. >>>> >>>> Antenna Orientation: I was especially struck by one very old and classic >>>> demo showing the response of a receiver in a non-aligned configuration >>>> with the antenna orientation. For example, a horizontal receiving antenna >>>> and a vertical transmitting antenna, or vice versa. This demo showed >>>> clearly that the antenna needs to be properly oriented, and that a 90 >>>> degree disorientation gave no response at all. So, an FSD would have to >>>> have 360 response in order that the orientation does not introduce falsely >>>> attenuated response simply due to the antenna orientation. It might look >>>> something like a Van der Graff ball somehow; and possibly this is why it >>>> the dangling antenna looks like a ball in Jeff’s reference. >>>> >>>> Antenna Length: Then, there is the question; how big does it need to be. >>>> Since a field strength indication is really a relative reading, this may >>>> not be an issue. It does introduce a complication in that the field >>>> strength meter would need to be tightly tuned to a testing frequency, even >>>> if the antenna is really inefficient. Without tuning, the field strength >>>> antenna will very strongly tend toward resonation on shorter wavelengths, >>>> and thus provide false readings. >>>> >>>> In other words, the little wire coming off of the field strength meter we >>>> may have, but have never used, may qualitative only and not quantitative, >>>> since the reading will depend on the orientation and length of its >>>> antenna. An antenna for the Field Strength Drone would have additional >>>> requirements to satisfy the measurement requirements. It is not going to >>>> be a matter of just flying a field strength meter through the field. >>>> >>>> Food for thought. Opinions? >>>> >>>> Mark >>>> N5PRD >>>> >>>> >>>>> On Mar 10, 2021, at 5:36 PM, Mark Brantana <[email protected]> >>>>> wrote: >>>>> >>>>> Thanks for all the great comments. The real question at this time is, >>>>> does anyone have an interest in working with me on this project? It is a >>>>> purely ham project and we get paid in bragging rights. >>>>> Mark >>>>> N5PRD >>>>> >>>>>> On Mar 10, 2021, at 5:17 PM, Mark Brantana <[email protected]> >>>>>> wrote: >>>>>> >>>>>> Rick, >>>>>> >>>>>> Agreed. And it is beginning to look like there is a need to build and >>>>>> test such a thing to really learn it’s value. For instance, I never knew >>>>>> how useful an my nanoVNA would be until I bought one. Sure, I could do >>>>>> an SWR study the old way, but the new widget enables me to do a lot >>>>>> more, faster and easier. >>>>>> >>>>>> I just threw this question out this morning for discussion, and got my >>>>>> money’s worth from everyone. It was academic at that time, but now I am >>>>>> wondering all the more why there isn’t some video on YouTube showing >>>>>> some ham who has built such a device. It seems like this is something >>>>>> wanting to be made, at least for ham use. >>>>>> >>>>>> Mark >>>>>> >>>>>>> On Mar 10, 2021, at 2:59 PM, Gary Sitton via BVARC <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>> Rick: >>>>>>> >>>>>>> I really agree especially since I've looked into the drone motor >>>>>>> controllers. >>>>>>> They typically emit so much onboard and radiated hash that special >>>>>>> by-pass >>>>>>> precautions are taken with some of the onboard sensors, e.g. >>>>>>> accelerometers >>>>>>> for orientation sensing. I disagree that modelling software is >>>>>>> adequate for >>>>>>> the typical antenna environment, e.g. antennas below a wavelength. Also >>>>>>> conformation of directional antenna's front-to-back and forward gain for >>>>>>> optimization purposes would be nice if even perhaps extravagant. >>>>>>> >>>>>>> 73, Gary K5AMH >>>>>>> >>>>>>> PS: Most drone controllers use the STM ARM processors for which there >>>>>>> is free open source drone software: https://betaflight.com/ >>>>>>> >>>>>>> >>>>>>> On 3/10/2021 2:34 PM, Rick Hiller via BVARC wrote: >>>>>>>> Comment: Is an FSD applicable? >>>>>>>> >>>>>>>> Although an FSD would provide a close-in Far Field pattern of an >>>>>>>> antenna antenna installation, which is very cool indeed. Is it really >>>>>>>> necessary in the world of Ham Radio? >>>>>>>> >>>>>>>> We already have antenna modeling software based on the NEC which is >>>>>>>> quite accurate, depending on the set up parameters provided, of >>>>>>>> course. That model analysis provides us with a pattern and a fair >>>>>>>> amount of operational information. >>>>>>>> >>>>>>>> But what do we (I) really want? I want to know what and how my >>>>>>>> antenna is performing in the real world outside of my QTH. Is it >>>>>>>> getting to Europe or VK? When is the best time and frequency to get >>>>>>>> to Japan or South Africa? Questions like this are not to be answered >>>>>>>> by a FSD. >>>>>>>> >>>>>>>> What we really need is a world wide system to detect our signals >>>>>>>> wherever they may occur. So let's start thinking of that. We just >>>>>>>> need a few hams on every continent to participate........Wait! Not so >>>>>>>> fast.......there is already a system that does this. WSPR and it is >>>>>>>> available from a local amateur radio dealer -- SOTA Beams >>>>>>>> https://www.sotabeams.co.uk/wsprlite-classic. QST Dec 2018 even >>>>>>>> has a review of this system. >>>>>>>> https://www.sotabeams.co.uk/content/QSTREVIEW.pdf >>>>>>>> >>>>>>>> Now look, I am not poo pooing the FSD concept , ideas, discussion, >>>>>>>> etc. Very cool indeed to get a group of folks excited and discussing >>>>>>>> antenna stuff. Woo Hoo! I'm all for it, being the antenna phreak >>>>>>>> that I am. I'm just taking a step back and seeing if it is >>>>>>>> necessary, practical or even applicable for Hams. Plus, maybe some >>>>>>>> don't know about WSPR. >>>>>>>> >>>>>>>> 73...Rick -- W5RH >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Virus-free. www.avast.com >>>>>>>> >>>>>>>> On Wed, Mar 10, 2021 at 1:57 PM Jeffery MacMillian via BVARC >>>>>>>> <[email protected]> wrote: >>>>>>>>> Here is a good paper on this very topic..... >>>>>>>>> >>>>>>>>> https://www.narda-sts.com/en/selective-emf/srm-3006-field-strength-analyzer/eID/pd/pdce/9063/pdfr/9500/ >>>>>>>>> >>>>>>>>> have Fun, >>>>>>>>> Jeff >>>>>>>>> KC5TT >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Wed, Mar 10, 2021 at 1:31 PM Tom Watson via BVARC >>>>>>>>> <[email protected]> wrote: >>>>>>>>>> Brilliant! >>>>>>>>>> >>>>>>>>>> On Wed, Mar 10, 2021, 12:22 AM Mark Brantana via BVARC >>>>>>>>>> <[email protected]> wrote: >>>>>>>>>>> OK, what is an FSD? It is a Field Strength Drone. It’s an idea I am >>>>>>>>>>> sure others have had, and I don’t expect to get around to designing >>>>>>>>>>> or patenting such a thing. But inventions are often just the >>>>>>>>>>> merging of new technologies, and this is not much different. I >>>>>>>>>>> don’t see any YouTubes about this or any other reference, so here’s >>>>>>>>>>> the idea: >>>>>>>>>>> >>>>>>>>>>> With all the capabilities of little drones I wonder if anyone has >>>>>>>>>>> designed one which can carry a field strength meter and fly a grid >>>>>>>>>>> around an antenna to evaluate antenna performance. The guts of my >>>>>>>>>>> little Radio Shack FSM would have weighed way less than an ounce. >>>>>>>>>>> >>>>>>>>>>> Ideally, the field strength meter could communicate to the base >>>>>>>>>>> through the drone transmitter, reducing weight. Software at the >>>>>>>>>>> base could link the drone 3D location data with the FS reading. The >>>>>>>>>>> drone would have to wait at test locations for the operator to >>>>>>>>>>> transmit, and ideally would move to the next location. Finally, the >>>>>>>>>>> software might be able to link with existing simulation software >>>>>>>>>>> for comparison with theory and allow for simulation model >>>>>>>>>>> improvement. This looks like it would take a small team to develop. >>>>>>>>>>> >>>>>>>>>>> This sounds like it would have many uses besides antenna >>>>>>>>>>> evaluation, like RFI evaluation. >>>>>>>>>>> >>>>>>>>>>> What about it? Has anyone done this? >>>>>>>>>>> >>>>>>>>>>> Mark >>>>>>>>>>> N5PRD >>>>>>>>>>> ________________________________________________ >>>>>>>>>>> Brazos Valley Amateur Radio Club >>>>>>>>>>> >>>>>>>>>>> BVARC mailing list >>>>>>>>>>> [email protected] >>>>>>>>>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>>>>>>>>> Publicly available archives are available here: >>>>>>>>>>> https://www.mail-archive.com/[email protected]/ >>>>>>>>>> ________________________________________________ >>>>>>>>>> Brazos Valley Amateur Radio Club >>>>>>>>>> >>>>>>>>>> BVARC mailing list >>>>>>>>>> [email protected] >>>>>>>>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>>>>>>>> Publicly available archives are available here: >>>>>>>>>> https://www.mail-archive.com/[email protected]/ >>>>>>>>> ________________________________________________ >>>>>>>>> Brazos Valley Amateur Radio Club >>>>>>>>> >>>>>>>>> BVARC mailing list >>>>>>>>> [email protected] >>>>>>>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>>>>>>> Publicly available archives are available here: >>>>>>>>> https://www.mail-archive.com/[email protected]/ >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> Rick Hiller >>>>>>>> e-mail: [email protected] >>>>>>>> Cell: 832-474-3713 >>>>>>>> Physical: 9031 Troulon Drive >>>>>>>> Houston, TX 77036 >>>>>>>> >>>>>>>> >>>>>>>> ________________________________________________ >>>>>>>> Brazos Valley Amateur Radio Club >>>>>>>> >>>>>>>> BVARC mailing list >>>>>>>> [email protected] >>>>>>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>>>>>> Publicly available archives are available here: >>>>>>>> https://www.mail-archive.com/[email protected]/ >>>>>>> >>>>>>> -- >>>>>>> Gary Sitton, K5AMH >>>>>>> [email protected] >>>>>>> SDR/DSP Consultant, >>>>>>> "Have FFTs, Will Travel." >>>>>>> ________________________________________________ >>>>>>> Brazos Valley Amateur Radio Club >>>>>>> >>>>>>> BVARC mailing list >>>>>>> [email protected] >>>>>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>>>>> Publicly available archives are available here: >>>>>>> https://www.mail-archive.com/[email protected]/ >>>> >>>> ________________________________________________ >>>> Brazos Valley Amateur Radio Club >>>> >>>> BVARC mailing list >>>> [email protected] >>>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>>> Publicly available archives are available here: >>>> https://www.mail-archive.com/[email protected]/ >>> ________________________________________________ >>> Brazos Valley Amateur Radio Club >>> >>> BVARC mailing list >>> [email protected] >>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>> Publicly available archives are available here: >>> https://www.mail-archive.com/[email protected]/ >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> Publicly available archives are available here: >> https://www.mail-archive.com/[email protected]/ > > > -- > Rick Hiller > e-mail: [email protected] > Cell: 832-474-3713 > Physical: 9031 Troulon Drive > Houston, TX 77036 > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Publicly available archives are available here: > https://www.mail-archive.com/[email protected]/
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