Homebrew vhf atu

Homebrew 1kW UNIVERSAL TUNER T-type tuner design in order to make it universal with a high quality Guanella current Balun (T240-43 toroid). Since i am using external Guanella balun , this is the ratio i build into a 2 separated plastic box : 1:1 , 4:1 and 1:4 (reverse ports balance/unbalanced) This antenna tuner is… lg recall check Kenwood TS-50S 100W HF Tranceiver matching atu Watson w-25sm 25AMP 100% working . $474.11 + $88.41 shipping . YAESU FT-100D HF/VHF/UHF All Mode Transceiver . $498.74 + $76.65 shipping . Yaesu FT-817ND HF/VHF/UHF Portable QRP Radio w/ New Alpha Antenna . $365.00 + $22.45 shipping .Checking out an Icom 746PRO on 2 meters using a copper J-pole antennaon the tower I found the SWR of the J-pole was 3.5 to 1.0 quite high . We had high win... 36 Gifts for People Who Have EverythingAmateur Radio Short Wave bands, VHF, UHF, amprnet wireless and internet links. ... VHF ATU Homebrew Design G8MNY Aug 2005 ... farmall m stroker crank The ATU enables me to use the 40-metre dipole on 20, 40 and 80 metres, and the 12AVQ ground-plane on 10, 15, 20 and 40 metres --all with a SWR of 1.0 as seen by the transceiver. So much so, the ATU is useful even when a resonant antenna is used for the band of operation. On 20 metres and the higher bands, I normally use the 12AVQ ground-plane.70 MHz Antenna Tuning Unit for the 4 Meter Band by: Mike M0MTJ. The Idea: M0MTJ VHF Antenna Matching unit. Here's a real 'Heath Robinson' piece of home brew experimentation all made from components found after a rummage in the junk box! I have a little Wouxun 70 MHz handheld which I would really like to connect to a dedicated external antenna, but unfortunately I have no more space for further antennas outside! 6movies net CABLE X-PERTS, INC. – coax and more. WireMan Inc – Wires & Coax A Bunch. AF4K’s HOMEBREW: Projects, Parts & Kits from soup to nuts. to Amateur Radio Homebrew. eHam.net homebrew topics A selection of various homebrew items. Fox Delta Amateur Radio Projects & Kits Amateur Radio Projects & Kits. as much as its first local oscillator.This ATU, I call my design FRI-Match, has been devised in 1972 as an unbalanced tuner for improving the SWR at the transmitter end of coaxial feeders to resonant antennas (eg verticals, dipoles, trapped dipoles, G5RVs, Yagis, loopquads etc.). Basically the same features of the current internal automatic antenna tuners. glow plug light flashing audi q5Search: Homebrew Qrp Transceiver. Going along the same vein of "radio kits", this one is a little bit different 6m SSB & CW QRP transceiver by S56AL The concept of the 6m SSB & CW transceiver is similar to the 80m SSB & CW transceiver , described on this web site with some minor changes in AGC and audio PA Save this search A brief tap of a push ... Nov 11, 2022 · · Homebrew Portable HF-VHF- 40m to 2m antenna 6/mar/2015 - PowerWave360 Custom Antennas encontrou este Pin Homebrew Multiband Vertical HF Antenna Pin My Homebrew Vertical Multiband Hf Antenna On3jt on Pinterest 450 x 600 · 80 kB · jpeg 40 Meter Vertical Antenna Homebrew Home-brew Compact 6dBi Collinear Antenna What I don't like. The Annecke high power Symmetrical Koppler is a much better matchbox, but you will NEVER find one. free juicy vegas casino free spins On VHF and UHF the “tuning” of an antenna is far less critical than on HF. The wavelengths at 144 MHz and above provide a naturally wide bandwidth so that you assemble the antenna and, in most cases, it just works. Nearly all transmitting antennas at VHF and above are resonant types. There are basically only two classes of HF antennas ...The resource is currently listed in dxzone.com in 2 categories. The main category is Antenna and feed lines that is about Antenna feed lines and coax cables. This link is listed in our web site directory since Saturday May 6 2006, and till today " A T-Match ATU " has been followed for a total of 31429 times. So far received 20 votes for a total ...NEW, USED, or HOME-BREW: You have three sources of high power symmetrical matchboxes. Unfortunately new high-power symmetrical matchboxes are quite expensive. Hams in the US will pay a lot less than hams in Europe, but the hams in Europe have a broader portfolio to choose from. A magnifying glass. It indicates, "Click to perform a search". fu. emA magnifying glass. It indicates, "Click to perform a search". fu. em cr touch auto home not working ATU, Artificial Ground, ASU and RF Transformers ... VHF ATU. 3.7. Artificial Ground ... Home-Brew Technics in Antenna Tools. PSU for Amateur Radio from Computer ... Jul 5, 2015 · This dipole was constructed as follows: Cut 6 or 7 feet of 1″ thin-wall PVC. Cut two 38″ lengths of aluminum tape. Put one edge of the first tape on the pipe, nice and straight. Slide fingers along the tape, rotating the pipe slightly with each slide. Try to make no wrinkles. Apply the second tape, starting with about a 1/8 th ″ overlap. The ATU enables me to use the 40-metre dipole on 20, 40 and 80 metres, and the 12AVQ ground-plane on 10, 15, 20 and 40 metres --all with a SWR of 1.0 as seen by the transceiver. So much so, the ATU is useful even when a resonant antenna is used for the band of operation. On 20 metres and the higher bands, I normally use the 12AVQ ground-plane. VHF / UHF / Beyond: Diamond D-130 Discone antenna with 25-1300 MHz coverage at 20′. It is located at the 80-20 meter vertical location in the map below. The MAC 200 ATU is designed to cover 1.8 to 30 MHz and is capable of handling 200W however on the 160m band it battles to match the impedance and becomes unstable. craigslist wenatchee pets achieve an ideal match the ATU brings the feed line and antenna combination into resonance there by removing the systems reactance and then correctly loads the transceiver to allow maximum power transfer. Construction This has been a long term project that has had the key components such as 500pfQST April 2002, pp. 40-43 This could be one of the most versatile homebrew antenna tuners ever created. The EZ-Tuner Part 2 QST May 2002, pp. 28-34 The EZ-Tuner Part 3 QST June 2002, pp. 33-36 Simplified Design of Impedance-Matching Networks, Part I of III by George Grammer W1DF. drink menu outback 4 Sep 2015 ... M0MTJ VHF Antenna Matching unit. Here's a real 'Heath Robinson' piece of home brew experimentation all made from components found after a ...Jul 5, 2015 · Cut two 38″ lengths of aluminum tape. Put one edge of the first tape on the pipe, nice and straight. Slide fingers along the tape, rotating the pipe slightly with each slide. Try to make no wrinkles. Apply the second tape, starting with about a 1/8 th ″ overlap. Find the exact center of the tapes and cut away ¼″. kahoot it create free Checking out an Icom 746PRO on 2 meters using a copper J-pole antennaon the tower I found the SWR of the J-pole was 3.5 to 1.0 quite high . We had high win... Vintage Amateur Radio equipment. Class D Wavemeter 6 volt AC, Absorption Wavemeter 3.5-35MHz ,and field strength meter home brew HF. All the item's are untested.Homebrew Antenna Tuner - A Best of Breed Version. After having studied many possible ... ANTENNA propagation QRP SOTA RADIO STATION VHF 817 705 eme. kahoot bots spam Sep 5, 2015 · 70 MHz Antenna Tuning Unit for the 4 Meter Band by: Mike M0MTJ. The Idea: M0MTJ VHF Antenna Matching unit. Here's a real 'Heath Robinson' piece of home brew experimentation all made from components found after a rummage in the junk box! I have a little Wouxun 70 MHz handheld which I would really like to connect to a dedicated external antenna, but unfortunately I have no more space for further antennas outside! WX Broadcast Circuit Home Brew, Wx Radio, Reset Circuit Home Brew, VHF 1/4 wave Weather Radio Antenna Home Brew, Notch, 1/2 wave stub filter. ... HARDROCK-50 ATU Kit; HARDROCK-50 QSK Mezzanine Kit; 0. The performances of this band filter are very comparable. Maybe a BLP-1000, followed by a MMIC buffer, followed by a PHP-1000; total cost about.since attenuation with only one setting over the 3.5-3.8MHz band As it is shown, it covers 3520-3520kHz within the -5dB points, but was not more than 15dB weaker on 3800kHz when tuned for the cw band - without using the switch facility. See the remote tuned frame antennas for 136kHz and MW on page L2, pick a part monrovia inventory Search: Homebrew Qrp Transceiver. Going along the same vein of "radio kits", this one is a little bit different 6m SSB & CW QRP transceiver by S56AL The concept of the 6m SSB & CW transceiver is similar to the 80m SSB & CW transceiver , described on this web site with some minor changes in AGC and audio PA Save this search A brief tap of a push ...This ATU, I call my design FRI-Match, has been devised in 1972 as an unbalanced tuner for improving the SWR at the transmitter end of coaxial feeders to resonant antennas (eg verticals, dipoles, trapped dipoles, G5RVs, Yagis, loopquads etc.). Basically the same features of the current internal automatic antenna tuners. A Homebrew Antenna Tuner Instead of using link coupling to the antenna, his design uses capacitive coupling to the main coil. I was immediately intrigued. The parts count of this idea was as low as it could get: Two dual-section air variable capacitors - 470 pf per section. One inductance - a coil with taps on an iron powder toroid. No switches! chobani recall 2022 MFJ Makes one for around $400 and it goes up in price from there. If your starting off, I would suggest on building a Ground Plane Antenna and see how it works with the meter in your radio. then work your way up. There are programs for antenna design. I use 4NEC2 which will simulate your design so you have a good idea if your antenna will work. C1: 50 - 500pf Variable Capacitor: S1: Ceramic rotary switch. 1P3T. Radio selection: C2: 50 - 500pf Variable CapacitorThe ATU enables me to use the 40-metre dipole on 20, 40 and 80 metres, and the 12AVQ ground-plane on 10, 15, 20 and 40 metres --all with a SWR of 1.0 as seen by the transceiver. So much so, the ATU is useful even when a resonant antenna is used for the band of operation. On 20 metres and the higher bands, I normally use the 12AVQ ground-plane. wellspan.org A magnifying glass. It indicates, "Click to perform a search". fu. em Checking out an Icom 746PRO on 2 meters using a copper J-pole antennaon the tower I found the SWR of the J-pole was 3.5 to 1.0 quite high . We had high win... in the cockpit and input the wanted frequency, either VHF or HF. Most modern control panels are designed to ... Antenna-system: What is an antenna tuner? wake forest class of 2026 acceptance rate HOMEBREW HF ANTENA TUNING UNIT ( ATU ). ATU ini hanya memebutuhkan sedikit komponen saja dan mudah didapatkan, Variable Capasitornya saya ambil dari bekas ...Technically a true "longwire" needs to be at least one wavelength long. but Hams commonly call any end-fed wire a longwire or more correctly random wire antenna. Figure 1 Typical ATU and long wire antenna configuration with an earth or earth plus counterpoise. Figure 2 Typical 9:1 voltage unun and long wire antenna configuration with an earth ... drug slang from the 70s This tuner was indeed capable of matching my antenna to a 1.0:1 SWR throughout the entire 6 meter band (and even worked on 10 meters). However, hand capacitance was severe enough at 50 MHz to be quite troublesome. At 28 MHz hand capacitance was minimal. The schematic of this circuit is shown below. Second Attempt.This dipole was constructed as follows: Cut 6 or 7 feet of 1″ thin-wall PVC. Cut two 38″ lengths of aluminum tape. Put one edge of the first tape on the pipe, nice and straight. Slide fingers along the tape, rotating the pipe slightly with each slide. Try to make no wrinkles. Apply the second tape, starting with about a 1/8 th ″ overlap. redm farming An homebrew antenna tuner project Category : Antennas/Feed Lines Hits: 31429 | Votes: 20 | Rating: 5.85 About A T-Match ATU The resource is currently listed in dxzone.com in 2 categories. The main category is Antenna and feed lines that is about Antenna feed lines and coax cables.9 Mei 2012 ... ... ketimbang radio VHF dan UHF , atau istilah kerennya di sebut radio home brew (radio buatan sendiri di rumah), di samping ada radio ... ibm ess QRP Manual Antenna Tuner Tune 1-30Mhz Kit For HAM RADIO * CW DIY Set ... MFJ MFJ-921 144/220 VHF Antenna Tuner Watt Meter C MY OTHER HAM RADIO GEAR NEW.Dec 21, 2016 - QRP / SW antenna tuner ATU for HF ham radio shortwave homebrew - £14.99. FOR SALE! You are bidding on the following, no reserve item:- QRP / SW antenna tuner ATU for HF ham radio shortwave homebrewThanks for looking! Please take a moment to read and understand my Terms & Conditions BEFORE bidding. My Terms & Conditions.I have personally built my own hf wire and vhf/uhf yagi and omni antennas using my own designs or derivative designs after modelling them in the 4nec2 program as someone else mentioned. It's doable. On another forum, someone is throwing around the concept that antennas are a 90% mechanical engineering problem and after having made a couple of handfuls of antennas I'd have to agree. VHF Masthead Preamps RF Switched: RX SPC ATU: 100kHz to 4MHz Receive Converter: QRP TX SPC ATU: VLF/LF to 4MHz Receive converter: HF Tuneable Preamp 1.8-30MHz: VHF Receive converters 2m, 4m, & 6m: HF Switched Preamp 1.8-30MHz: Clara 2 Receiver: VHF Receive Preamp: Transverters 2m, 4m, & 6m: 110-400MHz Scanner Preamp: VHF Transmit Amplifiers, 25. 1 day ago · Making a Coaxial Dipole If you start with a common half wave (λ/2) stainless whip and extend it all the way down through a λ/2 long ...7 Agu 2021 ... VHF- Antennas ... Part- 3. ATU, Artificial Ground, ASU and RF Transformers ... Home-Brew Technics in Antenna Tools. kroger refill prescription An homebrew antenna tuner project Category : Antennas/Feed Lines Hits: 31429 | Votes: 20 | Rating: 5.85 About A T-Match ATU The resource is currently listed in dxzone.com in 2 categories. The main category is Antenna and feed lines that is about Antenna feed lines and coax cables.If you are searching about printable preschool calendars you've visit to the right web. We have 8 Pictures about printable preschool calendars like printable preschool calendars, 2022 calendar templates download printable templates with holidays and also calendar discovery monthly calendar worksheets calendar worksheets.The circuit consists of 2x each of the following: Fixed inductors, switched with relays in 128 steps, 0.25 uH per step, from 0.25 to 32 uH. All inductors are air-core coils. A toroid is only used in the 1:1 balun on the TX side. Fixed capacitors, switched with relays in 256 steps, 3 pF per step, from 3 to 800 pF. This dipole was constructed as follows: Cut 6 or 7 feet of 1″ thin-wall PVC. Cut two 38″ lengths of aluminum tape. Put one edge of the first tape on the pipe, nice and straight. Slide fingers along the tape, rotating the pipe slightly with each slide. Try to make no wrinkles. Apply the second tape, starting with about a 1/8 th ″ overlap. yeehaw junction news WX Broadcast Circuit Home Brew, Wx Radio, Reset Circuit Home Brew, VHF 1/4 wave Weather Radio Antenna Home Brew, Notch, 1/2 wave stub filter. ... HARDROCK-50 ATU Kit; HARDROCK-50 QSK Mezzanine Kit; 0. The performances of this band filter are very comparable. Maybe a BLP-1000, followed by a MMIC buffer, followed by a PHP-1000; total cost about. natalee holloway full movie 123movies First Attempt My first attempt was a simple T-Network circuit, using two 14-250 pF variable capacitors and a 0.2 uH air wound coil. The coil was constructed using #14 solid copper wire wrapped around a 3/4" bolt (0.2 uH = about 3 - 4 turns). I housed the circuit in a plastic enclosure to reduce stray capacitances.The ATU enables me to use the 40-metre dipole on 20, 40 and 80 metres, and the 12AVQ ground-plane on 10, 15, 20 and 40 metres --all with a SWR of 1.0 as seen by the transceiver. So much so, the ATU is useful even when a resonant antenna is used for the band of operation. On 20 metres and the higher bands, I normally use the 12AVQ ground-plane. Jan 21, 2023 · Price: £500.00. No additional import charges on delivery. This item will be sent through the Global Shipping Programme and includes international tracking. Learn more - opens in a new window or tab. Postage: £70.60 Express Delivery to United States. Postage help - opens a layer. craigslist homes for sale owner finance The EZ-Tuner - The "EZ-Tuner" is a homebrew automatic legal-limit antenna tuner that covers all amateur HF bands from 160-10 meters. Using a T-network design and controlled by a BASIC Stamp BS2sx microcontroller, the EZ-Tuner will match at least a 16:1 VSWR for either unbalanced or balanced transmission lines. A magnifying glass. It indicates, "Click to perform a search". fu. em30m ATU for endfed halfwave sloper has 10 turns coil, 55mm dia. 48mm long (Airdux), tapped at 1 and 8 turns. Capacitor is 50pF high voltage (Johnson). The measures are not critical, the only importance is to get resonnance and keep the turns-ratio between antenna- and TX-terminals almost like shown. kvd21 bridge modeATU, Artificial Ground, ASU and RF Transformers ... VHF ATU. 3.7. Artificial Ground ... Home-Brew Technics in Antenna Tools. PSU for Amateur Radio from Computer ...CABLE X-PERTS, INC. – coax and more. WireMan Inc – Wires & Coax A Bunch. AF4K’s HOMEBREW: Projects, Parts & Kits from soup to nuts. to Amateur Radio Homebrew. eHam.net homebrew topics A selection of various homebrew items. Fox Delta Amateur Radio Projects & Kits Amateur Radio Projects & Kits. as much as its first local oscillator. A magnifying glass. It indicates, "Click to perform a search". fu. em sofa macys Shakespeare 5400-XT Little Giant 4' VHF Antenna $132 Very simple to make VHF covers channels 2-13, while 14-51 are UHF Title: Portable_VHF_antennas This completes the assembly of the radio This completes the assembly of the radio. See it The ClearStream Flex is pricier than the ClearStream Eclipse, and larger The best UHF-only antennas are much. The band switching may be exercised manually by ...Designed originally in 1978, while at KLM electronics, this spectacular design holds it own with any of the multibanders on the market today. In 1998-9 the KT34A and. HF loop antenna HF Portable & Flexible Receive Loop Antenna Covers HF frequencies (10 kHz to 30 MHz) Usable on VHF up to 300 MHz as a folded Dipole. Home.I therefore wondered if I had a few parts in the 'junk box' that I could use to make an Antenna Matching Unit ("ATU"). The Design: I decided that I would try a Pi Match circuit, which I drew out as can be seen in the diagram below: M0MTJ VHF ATU: VHF Antenna Matching Unit for 70MHz - could be adapted for 50MHz tractor supply wood splitter ATU, Artificial Ground, ASU and RF Transformers ... VHF ATU. 3.7. Artificial Ground ... Home-Brew Technics in Antenna Tools. PSU for Amateur Radio from Computer ... class="scs_arw" tabindex="0" title=Explore this page aria-label="Show more">. 2022. 2. 6. · Homebrew Remote ATU MFJ993. Okay, so technically I'm using a commercial atu.The homebrew part has been to mount it in a waterproof case & make an atu that's supposed to sit in your shack, work as an exterior atu at the feedpoint of my aerial. Similiar idea to an SGC atu, but with the ability to handle ...The ATU enables me to use the 40-metre dipole on 20, 40 and 80 metres, and the 12AVQ ground-plane on 10, 15, 20 and 40 metres --all with a SWR of 1.0 as seen by the transceiver. So much so, the ATU is useful even when a resonant antenna is used for the band of operation. On 20 metres and the higher bands, I normally use the 12AVQ ground-plane.since attenuation with only one setting over the 3.5-3.8MHz band As it is shown, it covers 3520-3520kHz within the -5dB points, but was not more than 15dB weaker on 3800kHz when tuned for the cw band - without using the switch facility. See the remote tuned frame antennas for 136kHz and MW on page L2,This ATU, I call my design FRI-Match, has been devised in 1972 as an unbalanced tuner for improving the SWR at the transmitter end of coaxial feeders to resonant antennas (eg verticals, dipoles, trapped dipoles, G5RVs, Yagis, loopquads etc.). Basically the same features of the current internal automatic antenna tuners. maryland high school state championships NEW, USED, or HOME-BREW: You have three sources of high power symmetrical matchboxes. Unfortunately new high-power symmetrical matchboxes are quite expensive. Hams in the US will pay a lot less than hams in Europe, but the hams in Europe have a broader portfolio to choose from. This homebrewed antenna tuning unit also incorporates a 50-ohm QRP dummy load, power meter (1 or 10 Watts full scale), and SWR meter Switched inductor L match tuner A 10 to 80 meters band qrp antenna tuner by KC8AON, based on Steve Weber, KD1JV "ALT or Altoids L Tuner" Antenna Tuner LinksThis homebrewed antenna tuning unit also incorporates a 50-ohm QRP dummy load, power meter (1 or 10 Watts full scale), and SWR meter Switched inductor L match tuner A 10 to 80 meters band qrp antenna tuner by KC8AON, based on Steve Weber, KD1JV "ALT or Altoids L Tuner" Antenna Tuner Links tmc2209 v3 They're really very simple to build. I over-built this one to make it clear for the video, but you could make it smaller, put it in a nice box with label...Vertical hf antennas a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters) IK1ZYW Vertical antenna A vertical antenna for stationary-mobile HF-VHF operation Antenna tuner, matching network, matchbox, transmatch, antenna tuning unit (ATU), antenna coupler,. 11 hours ago · Search: Hf Vertical Antenna No Radials Homebrew. G0KSC Antennas - free yagi designs for ham radio The Titan is the ONLY antenna marketed with total continuous ...The atu may be able to match the modified load when a 4:1 balun is in circuit, but I m not sure how efficient this combination actually is. As part of these discussions a UK Amateur (Steve Hunt, G3TXQ) has suggested that I try taking some thermal images of a 4:1 voltage balun and a 1:1 current balun connected to the output of an atu when ... wisconsin drug bust 2022 Checking out an Icom 746PRO on 2 meters using a copper J-pole antennaon the tower I found the SWR of the J-pole was 3.5 to 1.0 quite high . We had high win... This tuner was indeed capable of matching my antenna to a 1.0:1 SWR throughout the entire 6 meter band (and even worked on 10 meters). However, hand capacitance was severe enough at 50 MHz to be quite troublesome. At 28 MHz hand capacitance was minimal. The schematic of this circuit is shown below. Second Attempt. freightliner straight pipes An homebrew antenna tuner project Category : Antennas/Feed Lines Hits: 31429 | Votes: 20 | Rating: 5.85 About A T-Match ATU The resource is currently listed in dxzone.com in 2 categories. The main category is Antenna and feed lines that is about Antenna feed lines and coax cables. Demo of a scratch built 8 band HF SSB transceiver.This video shows the receiver, transmitter to follow. Design by EI9GQ. Build by VK3HN. Blog post:https:/. HF Transceiver.This page will describe the construction of a multi band SSB transceiver.Because I do 99% of my operating on my four favourite bands, I decided to build a four band rig with provision for adding a fifth band later. how to set shader cache size to unlimited I therefore wondered if I had a few parts in the 'junk box' that I could use to make an Antenna Matching Unit ("ATU"). The Design: I decided that I would try a Pi Match circuit, which I drew out as can be seen in the diagram below: M0MTJ VHF ATU: VHF Antenna Matching Unit for 70MHz - could be adapted for 50MHz accident on dallas north tollway last night A Homebrew Antenna Tuner Instead of using link coupling to the antenna, his design uses capacitive coupling to the main coil. I was immediately intrigued. The parts count of this idea was as low as it could get: Two dual-section air variable capacitors - 470 pf per section. One inductance - a coil with taps on an iron powder toroid. No switches!achieve an ideal match the ATU brings the feed line and antenna combination into resonance there by removing the systems reactance and then correctly loads the transceiver to allow maximum power transfer. Construction This has been a long term project that has had the key components such as 500pfHomebrew sdr transceiver mindshare pcie training cost. bokeh axis. bin checker cc checker live or dead. lilo and stich porn movies. ey transaction diligence reddit. certmetrics cisco. annabelle 1 full movie download. formula vee transmission. tcl c635 vs c735. nas kengan ashura ...ATU, Artificial Ground, ASU and RF Transformers ... VHF ATU. 3.7. Artificial Ground ... Home-Brew Technics in Antenna Tools. PSU for Amateur Radio from Computer ... 3d snake game unblocked I have personally built my own hf wire and vhf/uhf yagi and omni antennas using my own designs or derivative designs after modelling them in the 4nec2 program as someone else mentioned. It's doable. On another forum, someone is throwing around the concept that antennas are a 90% mechanical engineering problem and after having made a couple of handfuls of antennas I'd have to agree.ATU, Artificial Ground, ASU and RF Transformers ... VHF ATU. 3.7. Artificial Ground ... Home-Brew Technics in Antenna Tools. PSU for Amateur Radio from Computer ...A Homebrew Antenna Tuner Instead of using link coupling to the antenna, his design uses capacitive coupling to the main coil. I was immediately intrigued. The parts count of this idea was as low as it could get: Two dual-section air variable capacitors - 470 pf per section. One inductance - a coil with taps on an iron powder toroid. No switches! I therefore wondered if I had a few parts in the 'junk box' that I could use to make an Antenna Matching Unit ("ATU"). The Design: I decided that I would try a Pi Match circuit, which I drew out as can be seen in the diagram below: M0MTJ VHF ATU: VHF Antenna Matching Unit for 70MHz - could be adapted for 50MHz how to hurt your ex boyfriend with words VHF / UHF / Beyond: Diamond D-130 Discone antenna with 25-1300 MHz coverage at 20′. It is located at the 80-20 meter vertical location in the map below. The MAC 200 ATU is designed to cover 1.8 to 30 MHz and is capable of handling 200W however on the 160m band it battles to match the impedance and becomes unstable.This ATU, I call my design FRI-Match, has been devised in 1972 as an unbalanced tuner for improving the SWR at the transmitter end of coaxial feeders to resonant antennas (eg verticals, dipoles, trapped dipoles, G5RVs, Yagis, loopquads etc.). Basically the same features of the current internal automatic antenna tuners. The circuit consists of 2x each of the following: Fixed inductors, switched with relays in 128 steps, 0.25 uH per step, from 0.25 to 32 uH. All inductors are air-core coils. A toroid is only used in the 1:1 balun on the TX side. Fixed capacitors, switched with relays in 256 steps, 3 pF per step, from 3 to 800 pF. skytils rat MAKE A HOMEBREW HF-VHF ANTENNA TUNER (It really isn't all that difficult.) This page details several T-match tuners. By comparing them, you should be able to construct a tuner to your own particular requirements. Now that a number of people have built them and provided feedback, several things to look out for have been identified. THIS PAGE how to fog a 2 stroke outboard motor nanovna HF VHF UHF nano vna mini vector network analyzer antenna tuner filter antena duplexer ... ATU-100 DIY Kit 1.8-50M Hz Automatic Antenna Tuner + OLED. budget unraid build 2022 C1: 50 - 500pf Variable Capacitor: S1: Ceramic rotary switch. 1P3T. Radio selection: C2: 50 - 500pf Variable Capacitor This homebrewed antenna tuning unit also incorporates a 50-ohm QRP dummy load, power meter (1 or 10 Watts full scale), and SWR meter Switched inductor L match tuner A 10 to 80 meters band qrp antenna tuner by KC8AON, based on Steve Weber, KD1JV "ALT or Altoids L Tuner" Antenna Tuner LinksC1: 50 - 500pf Variable Capacitor: S1: Ceramic rotary switch. 1P3T. Radio selection: C2: 50 - 500pf Variable CapacitorThe ATU enables me to use the 40-metre dipole on 20, 40 and 80 metres, and the 12AVQ ground-plane on 10, 15, 20 and 40 metres --all with a SWR of 1.0 as seen by the transceiver. So much so, the ATU is useful even when a resonant antenna is used for the band of operation. On 20 metres and the higher bands, I normally use the 12AVQ ground-plane. ac odyssey crit damage while full health engraving