Hf dipole

Author: s | 2025-04-25

10 meter dipole Loaded Dipole. All-Band OCFD. HOA HF Vertical. NVIS dipole. 160M End-Fed. 160M Windom. Carolina Windom. HF Vertical. HF Military. Design Software. Antenna

HF/VHF Dipole - vk6ysf.com

Discone antenna mounted on my roof (~20 metres from the ground) for the RTL-SDR profiles. I am using a dipole tuned for the marine band for the RTL-SDR3 profiles. If someone else is using one SDR, please use the other SDR or ask before changing a profile. (RTL-SDR/RTL-SDR3).MLA-30 Loop Antenna for the MLA-30 HF profiles. Contact: soundsofatc.com/contact ‎ ‎‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ This portable HF VHF UHF is a resonant and legal limit rigid dipole and vertical antenna that covers 2 to 40 meters plus 220MHz & 440MHz. Rated the #1 best portable Vertical and Horizontal Dipole antenna by eHam users for over 5 years.SpecificationsPower: Full legal limitRF Connection: SO-239Frequency: 2 – 40 Meters, plus 220MHz, & 440MHz80 ounces is the maximum weight when deployed as a dipolePackable at a size of 24 x 4 1/2 inchesEnvironmental operating parameters: -15 to 130 degrees Fahrenheit and winds up to 35 Mph when guyed, otherwise 15 Mph.We listen!Suggest a price without Options for marketing to review your expectations.Included2 – 5.41 meter (17′ 9″) telescopic stainless-steel whips (with “Alpha Antenna” laser engraved)1 – HexTenna hub2 – 30/40 meter wire clip-on 18′ elements (one set)1 – 31 foot counterpoise for use on 12-20 metersPlease note that Counterpoise are highly efficient tuned elements that are deployed at resonant lengths by rolling out the coil of wire.1 – HD Surveyor TripodDeploymentFor temporary outdoor use, deployment can be achieved using the included Top of Mast Mount, which can be affixed to any sized pipe between 1 to 1 1/4 inch outside diameter. It is recommended that you ALWAYS guy this system. For guying options see the Mast Guying Adapter to stabilizes deployments.NOTE – There is no upgrade path to the HexTenna Yagi, as it has a different design, and the hubs are physically mounted on the boom.AnalysisDownload the Scans for the AntScope application: Download Scans hereDIPOLE CONFIGURATIONVERTICAL CONFIGURATIONBandSWRBandSWR2 Meters1.01:1440

Hf Dipole Antenna for sale

GeomAnalyzerBase that computes directorvec2 – a GeomAnalyzerBase that computes descriptorTypically both director and descriptor return Nx3 vectors for eachframe, where N depends on the context. In this case, one should makesure that the orders of these vectors match. For example, if bothdirector and descriptor give one vector per molecule, then theimplementation should guarantee the molecule orders are the same invec1() and vec2().For axis director which returns 1x3 vector, reduction with descriptoris taken care of by numpy broadcasting. For more complicated caseswhere director and descriptor have incompatible dimensions, the userneeds to provide special-purpose reduce function, seeSmartsDirector.reduce_vec for example.__call__()¶Call self as a function.__class__¶alias of builtins.type__delattr__¶Implement delattr(self, name).__dict__ = mappingproxy({'__module__': 'schrodinger.application.desmond.packages.analysis', '__doc__': '\n Given the director (local or global), and the descriptor (local or global),\n calculate the order parameter for each frame\n S = 1/N sum_i ((3 * (n dot m_i)^2 -1) / 2)\n Where n is the director vector and m is the descriptor vector.\n For example, n is the z axis and m is the electric dipole moment.\n\n Typical usage includes\n Director Descriptor result\n Axis Lipid avg over carbon type\n Axis Smarts avg over bond type\n Axis Dipole avg over molecule\n SystemDipole Dipole avg over molecule\n Dipole Smarts avg over bond type\n\n To extend its functionality, implement to the `GeomAnalyzerBase` interface\n and provide the reduction rule as callable.\n ', '__init__': , '_precalc': , '_postcalc': })¶__dir__() → list¶default dir() implementation__eq__¶Return self==value.__format__()¶default object formatter__ge__¶Return self>=value.__getattribute__¶Return getattr(self, name).__gt__¶Return self>value.__hash__¶Return hash(self).__init_subclass__()¶This method is called when a class is subclassed.The default implementation does nothing. It may. 10 meter dipole Loaded Dipole. All-Band OCFD. HOA HF Vertical. NVIS dipole. 160M End-Fed. 160M Windom. Carolina Windom. HF Vertical. HF Military. Design Software. Antenna Diamond Antenna HFV-5 HF Rotatable Dipole Antennas answer the need for limited space multi-band dipole antennas. These rotatable dipoles cover the classic HF bands

What HF Antenna is Best? The HF Vertical, Dipole, or

Yagi Calculator adalah sebuah software yang dikemas oleh John Drew (VK5DJ) yang metode dasarnya dibuat oleh Gunther Hoch (DL6WU) yang legendaris itu. Bagi teman-teman pemula, penulis merekomendasikan software ini dengan alasan:Metode perhitungannya dibuat oleh Gunther Hoch (DL6WU), seorang hebat dan sedemikian terkenal melalui perhitungan long yagi-nya, yang sampai sekarang masih di-amin-i oleh para ilmuwan terlebih yang hanya sekedar praktisi tentunya.Software jadi yang langsung memberikan hasil perhitungan berdasarkan input yang diberikan oleh operator (frekuensi offset, diameter elemen, dan kondisi/posisi elemen terhadap boom).Bagi non pemula, software ini bisa dijadikan batu loncatan utuk mendisain antena sesuai keinginannya, dengan melakukan optimasi disana-sini. Walaupun memiliki keterbatasan yang hanya mampu untuk tipe antena turunan yagi (dengan driver dipole) dan folded dipole. Untuk bentuk-bentuk yang lain, sofware ini tidak mampu.Menyambung poin di atas, kelebihan software Yagi Calculator ini mampu berkorelasi dengan software lain yang memiliki fitur lebih komplit (misalnya fitur optimasi, frekuensi sweep, dll), seperti Yagi Optimizer (YO) by Simone Mannini (IW5EDI) dan MMANA-GAL, melalui opsi "create" file. File dengan ekstensi yo untuk Yagi Optimizer (YO) dan ekstensi maa untuk MMANA-GAL. Setelah kita memiliki software Yagi Calculator, untuk memulainya cukup dengan dengan memasukkan data atau kriteria antena yang akan kita buat. Untuk mempermudah, penulis akan menjelaskan langkah-langkahnya melalui gambar. * Tampilan antar muka software Yagi Calculator * Pilih Task, Design Yagi. Kemudian isi/ubah field-field yang perlu diubah (tidak semua field harus diisi/diubah) disesuaikan dengan model yang kita kehendaki. Keterangan Gambar:1. Frekuensi yang dikehendaki.2. Diamater lingkar driver. Ini hanya untuk model FOLDED DIPOLE, abaikan field ini bila Anda ingin membuat driver model DIPOLE.3. Jarak antar pole (FEED POINT).4. Jumlah direktor.5. Diameter Boom.6. Bentuk Boom (bulat atau kotak).7. Bentuk direktor dan reflektor (umumnya bulat).8a. Pilih bonded (untuk model pemasangan reflektor & direktor di tepi/bibir boom).8b. Pilih insulated (untuk model pemasangan reflektor & direktor yang menembus boom tapi tidak konek With the 40 meter dipole. That isn't always possible or effective use of time and materials, especially for the size of a 40 meter yagi element.With exact measurements of the feed point impedance and gamma match dimensions there are several methods to calculate the dipole impedance of the antenna:Reverse the gamma match design equations and solve for the feed point: Z₀ = R + jXBuild equations from the fundamentals to calculate the dipole impedance Z₀Using an existing gamma match calculator, manually enter R and X values until the design parameters match the dimensions of the built gamma match; alternatively, automate the process with a software algorithmI gave up on the gamma match calculator distributed with the ARRL Antenna Book because it is difficult to use. Each iteration requires re-entry of all the parameters, which is absurd. It is also not possible to inspect the algorithm. For my most recent calculations I used the TNL (Tolles, Nelson, Leeson) algorithm programmed by Cebik in an Excel spreadsheet. Cebik is gone but his articles and files have been archived in several places. I won't give any URLs because they likely have a short lifetime. Use a search engine to locate copies extant at the time of your search. After all, you could be reading this article years after it was written.I converted the Excel spreadsheet to Open Office and plugged in the dimensions of the gamma match. I hoped to see the best fit with the NEC2 model of the yagi's dipole impedance. That didn't happen.I manually adjusted the dipole Ra and Xa values in the spreadsheet until it churned out the measurements of the matched antenna to within a few percent. The final values of Ra and Xa that resulted in the actual gamma match dimensions do not look realistic (see the screenshot below). Even so, the TNL algorithm's estimate based on the modelled impedance was a pretty good starting point to build and adjust the yagi's gamma match. As previously discussed, there are anomalies introduced by the cylindrical gamma capacitor and other components of the built antenna and match. For example, the precise location of the feed point (coax connector and wire leads) and using 2" as the average DE diameter. I found that small changes to Ra and Xa cause relatively large changes to the gamma rod length Lgr and gamma capacitor Cs.The values of Ra and Xa are not correct. Ra ought to be closer to 20 Ω and Xa nearly twice as large. But I don't really know, and that's why I want the ability, with reasonable accuracy, to reverse the gamma match equations. I copied out the equations from the spreadsheet cells to see how difficult it

MULTIBAND HF DIPOLE - Wireless Girl

Controls, the effects of which are illustrated in figure 19. Page 19 The DIP switches should be set as follows, where ON is down: ���� � ������ � ��������� �� �� ����� ����� ���� ����� ���� ������� ��� �� ����� ����� ���� ���� ������� ������ � ������ � ��������� �� ��� �� ������� �� ��� �� ���... Page 20: Configure The Ct800 Xo To The Speaker However, a special package that includes a suitable microphone, USB sound card and a cut- down version of the software that includes everything required for tuning a CT800 system may be obtained directly from B&W. Contact your country distributor for details. Page 21: Configure The Dipole Lobe For A Ct8 Ds C10 C11 C12 Figure 21 Setting the Subwoofer gain Disconnect the speakers from the power amplifiers. Connect the MF/HF power amplifier to the Subwoofer output of the unit. Set the output level of the oscillator to zero and connect it to the appropriate test input socket. Set the oscillator frequency to 25Hz. Page 22: Configure The Equalisers The Theory A number of response measurements R to R are taken and the average or mean response R is calculated. The microphone is left at position and further measurements are taken as adjustments are made to the equalisation. If the measured equalised response at position (called R ) is multiplied by R... Page 23 Connect the output of the sound card to a front test input socket of the CT8 XO and the microphone to the input of the sound card. Open WinMLS2004 From the menu, select Setup…Load… and load the setup called “B&W CT800” from the “Sound System” folder. Click the button to open the “Volume and Input Levels” window. Page 24 Figure 24 Figure 25 Place the microphone at the chosen measurement position that is closest to the speaker under test (where it will measure the highest sound pressure level). Set the “Input Ch.1” slider to maximum. Set the “Output” slider to zero and switch on the test signal by clicking the Ch.1”... Page 25 Figure 26 Figure 27 Figure 28 To set this curve as a multiplier, press the F5 key. In this dialog box, select the file you just saved (Average_resp) and, under ‘Compensation of Level’, check the ‘Tune EQ (multiply)’ box as shown (figure 26). This curve is now the reference and all subsequent measurements will be multiplied by this

Your First HF Dipole - eHam.net

AcDve monsoon as having mean westerly zonal winds to 500 hPa and mean easterly zonal winds above 300 hPa. MSLP (contours) and 900 hPa vorDcity (shading) during acDve monsoon on 23 March 2006. Figure 9F1.3(b) 4. Variability of the monsoon Tropospheric Biennial Oscilla.on (TBO) § The TBO is a major mode of interannual variability of the Asian-Australian monsoon (a) Weak Aus monsoon§ The tendency is for a relaDvely strong Indian or Australian monsoon to be followed by a relaDvely weak one, and vice versa. § Asian-Australian monsoon intensity is modulated by both the TBO and ENSO. (b) Strong Indian monsoonFigure 3.54 (c) Strong Aus monsoonMeehl et al. (2003) El Niño-Southern Oscilla.on (ENSO) § ENSO influences the South Asian summer monsoon through the strength of the Walker CirculaDon. Generally, El Niño brings a weak monsoon and La Niña brings a strong monsoon, but the correlaDon varies over Dme. § ENSO has a significant impact on the Australian monsoon, with drier condiDons expected over north-east Australia during El Niño. The monsoon onset is generally later during an El Niño, with overall reduced rainfall. Figure 3.55 Indian Ocean Dipole (Zonal Mode) § The Indian Ocean Dipole (IOD) or Indian Ocean Zonal Mode is an east-west oscillaDon in SST anomalies that is accompanied by a shia in precipitaDon anomalies. § The posiDve IOD phase is associated with heavier rainfall over Africa, less over Indonesia; the reverse paiern occurs during the negaDve phase. § Generally, the dipole develops in June-July, reaches its peak in October-December,. 10 meter dipole Loaded Dipole. All-Band OCFD. HOA HF Vertical. NVIS dipole. 160M End-Fed. 160M Windom. Carolina Windom. HF Vertical. HF Military. Design Software. Antenna Diamond Antenna HFV-5 HF Rotatable Dipole Antennas answer the need for limited space multi-band dipole antennas. These rotatable dipoles cover the classic HF bands

Reviews For: KELEMEN HF DIPOLE - eHam.net

Tuner. That kind of coverage requires a lot of wire and space, but shorter versions can be made, e.g. 80-6 Meters, or 40-6 Meters, if you don't need the lower frequencies or have space restrictions. --> TFD stands for Terminated Folded Dipole. Tilted, because the original intent was to install it with one end much higher than the other. But a tilted installation is not requied. When the TFD is installed horizontally it is often referred to as a Balanced, Termination Folded Dipole (BTFD). --> The TFD antenna is similar in construction to the Folded Dipole. The main difference is that, at the point opposite the feed point, is broken and a terminator is added. --> However, some hams have a preference to using 50/75Ω coaxial cable. When feeding the TFD with coax, the high feed impedance of the antenna neest to be transformed to the low impedance of the coax. The transformation radio require is 16:1 for 600Ω feed, 9:1 for 450Ω feed, or 4:1 for 300Ω feed. Some refer to these transformers as Baluns (Balanced to Unbalanced). However, most are in fact Ununs (Unbalanced to Unbalanced). Because of this, the coax would become part of the antenna. This can cause feedline radiation and RFI. This may also skew the radiation pattern. To help prevent the feedline radiation, a choke is needed at the impedance transformer's input. T2FD Sloper with 300 Ω Twin-Lead --> --> It has also been suggested, in Monitoring Times, May 1994 by William Clem Small, KR6A, that a good way to create a T2FD and antenna is with 300 Ω Twin-Lead and erecting it as a Sloper that is slanted between 20 to 40 Degrees, from the vertical. -->