February 19, 2012 2:33 pm . On top of the Switch box is his homebrew Antenna Switch Box using the Far Circuits PCB for the KO4NR Antenna Switch published in the April 2005 QST. And there are two ways to power a remote antenna switch. Homebrew RX 75Ω Antenna Switch Fred #176 . following info. I had another box that had 6 inch wire and it didn't affect it. When the switch is in the non-connected position, the tube lights up and discharges the antenna (both poles) if an appropriate amount of static charges has been built upon it. Homebrew 1kw universal antenna tuner with balanced and unbalanced output using Guanella Current transformer. It is listed under "Repeater, Controller, and Station Accessories". You can use this . The Ultimate is a HIGH PASS filter, with an input capacitor, a roller inductor to ground, and an output capacitor. About Mobile Dual-Band 2m/440 -- Roger K6XQ advises-Can I build a 2m/440mhz 5/8 mobile antenna? This way and by using 2- pole relays, the design only has two LPF switching relays instead of 4 or 10. . It is NOT compatible with the 2MCP8A, or any other M2 antenna. You can use a separate control wire from your operating position. ( 1 ) Estimated Ship Date: Apr 22, 2022 (if ordered today) Documentation. Nice Job Jim, Please bring it to the next meeting for Show + Tell. ANTENNA IMPEDANCE MATCH (see end note 2): This is the impedance that will terminate the coax lead-in cable from the antenna. CN88xc [Extra] 5 minutes ago. For scanner use, I wouldn't worry about this. I regulary run the full UK legal limit of RF power through it with no signs of any problems, Its usable upto 30 mhz. Construction on this rig began in the early '80s and finished (almost) by 1990. New New New. ANTENNA SWITCH 2x2. A home brew remote switched array of L-Networks. The FRI-MatchforA Homebrew Antenna Tuner Instead of using link coupling to the antenna, his design uses capacitive couplingto the main coil. The SixPak is to help enable an exploratory foray into SO2R operating. $80.00. . HOMEBREW. Mobile Dual Band VHF/UHF Antenna-- Homebrew Project from VE3RGW Mobile HF Antenna By HB9ABX 10-80m MOBILE HF MULTIBAND ANTENNA PROJECT - From Mark D. Lowell, N1LO Moxon Antenna Projects-- 17M and 20M Via KD6WD. Hold the board only by the edges from now until it is etched. When Nintendo officially ended production of the 3DS in September 2020, it wasn't exactly a surprise. If you're only using one rig and just need to switch between two antennas, go to Lowes or Home Depot and buy a light switch and a metal junction box. I haven't seen any real difference I live in a noisy area so maybe that's why. The two . High Isolation T/R Relay. Switch the antenna path to either my HF antenna, 4m & 6m dual band Yagi, or possibly a transverter. Dose anyone know how homebrew a switch. . 73, Bob - W3YY -----Original Message----- From: towertalk-bounces@contesting.com [mailto . This is the homebrew Murch style transmatch I built to work with the new K7DYY AM transmitter for 160 and 80 Meters. I don't. The central (VERO) board is the band decoder and driver unit for the antenna switch. It must be a high band isolation switch to meet my Triplexer with BPFs specification; It must provide 50 Ohm load to every unused port for a triplexer setup; Below is a partial schematics of one band of the 2×6 antenna switch. Homebrew Remote Antenna Switch. I haven't seen any real difference I live in a noisy area so maybe that's why. Also switches should be of high quality with rotary ceramic types being preferred. Coax Cable Antenna Switch, homebrew - KO4NR coax cable antenna switch construction by ve3cgc [ Hits: 4476 | Votes: 5 | Rating: 3.6 ] Five Antennas Switch Box - A project of a 5 Antennas Relay Switch Box, all Switches & Relays have both contacts wired in parallel to improve reliability of operation, to prevent static build up, when an antenna is . There is an extra relay to control 50 Ohm . B&W 595 Antenna Switch as Received. • Port five is connected to the RF feed line by default and a control signal must be present to Simple Two Position Remote Antenna Switch. This most often includes ham radio and CB antennas. Vote. I would never attempt a homebrew remote antenna switch project again, given the good availability of remote switches from a number of commercial sources. Home made antenna switcher, The box came from Maplins, The switch is a double pole, Double throw and is rated for 16 amps, The connectors are SO-239's.The switch is arranged so that the un-used socket is shorted (Grounded). The main category is Antenna switches that is about Antenna switch projects. I guess I haven't posted in a long time . Is there a homebrew, I could make? This was a Networking (data) Switch with 3 sockets on the back and an A/B switch on the front. RA-20A-1 Remote Antenna Switch W5BWC Electronics 9108 FM 1972 Gilmer, TX 75645 February 2009 2 • The RA-20A-1 is designed to remotely switch five 50 unbalanced antenna ports to a single RF feed line using a weather resistant, tower mounted assembly. Right is the power supply (13.5V - 0.5 amp regulated). The 21 pictures herefollow it from where it now leaves an antenna switch connected to the KX3 antenna connector utilizing the built-in KX3 tuner instead of the homebrew antenna tuner shown in the picture, out the shack window, in the attic window, through the attic, out the back attic window down to the end at a post in the back yard. The remote antenna switch selects from 3 dipoles, 2 inverted Ls, and a dummy load. A Homebrew Antenna Tuner 3-30m Ok, so my goal for a long while has been to homebrew a complete station, from antenna to tuner, transmitter and receiver. OK1RR also has some good technical chops. The switch is quite easy to fabricate. Dual Inverted L Housing for Switch/UNUNs and Tuner Use a separate antenna switch. A Homebrew High Voltage Knife Switch. An easy and inexpensive antenna coax switch for antennas using the S0-239 connectors. Additional information on the author's web site. Have the RF switching part separate from the switching logic. It would also be useful to have the ability to use more than one resonant antenna on a given band. The LPFs used here, were selected by the antenna in use; a 20-15-10 m tribander. An automatic T/R switch for break in CW like the Johnson 250-39 does it all for you, except the muting. Local Antenna Switches for HF, 6m, 2m 3 Position Coax Switch DC - 1 Ghz Connector: SO239 Power rating 2kw DC-30Mhz 1kw 30-200Mhz 500w 200-500Mhz 250w 500Mhz-1Ghz Insertion loss: DC-500 Mhz < .05db 500Mhz-1Ghz < .1db Isolation: DC-500 Mhz > 70db 500Mhz-1Ghz > 60db VSWR DC-500. What kind of Ant. KIT 6:1 remote antenna switch for SO-239 complete KIT without the box and SO239. It is the circuit board and a full set of the required Zettler relays (az755-1c-12DE). #1. I'm building a couple of receiving antenna switches. ( Pic of my completed band decoder. I played with cutting the coax to the right length and finally decided against this method.Instead I started looking at a . With the addition of a second radio into the shack the need to switch the rigs between the antenna became a problem. Here is a couple of pictures of the "business end" of my antenna switch. Only reason i made a different one is because i wanted to make the desk look cleaner and have everything with in arms reach. $16.00 + $3.80 shipping + $3.80 shipping + $3.80 shipping. Recognizing this problem, even the Dow Key Relay series later introduced a model with high isolation contacts. toggles the antenna amplifier on and off. 60-62 A T/R switch that also mutes the receiver and allows for monitoring the CW sidetone—perfect for your vintage station. Antenna Switch . 1. It costs $55, though. More information on this item will be . I'm still looking for a design for a 12v antenna rotator. The little Z . Some have been plastic boxes and others have been metal. I have been playing with and experimenting with lots of circuits getting my head around what works and what does not work and coming up with a design that will be usable. Far Circuits has the KO4NR project from QST, April 05antenna switch project. 1. A Homebrew Condenser Microphone by Sam Kennedy KT4QW QST December 2003 p. 28-32. Introduction PE1ITR suggested me to make a switch that would allow both horizontal, vertical, Left Hand Circular Polarization (LHCP) and Right Hand Circular Polarization (RHCP) for the 2x6 elements DK7ZB cross yagi that I made. The buttons operate a system of latches (74HCT75) that feed drivers (ULN2803A) that then perform the same function as the rotary switch. XP. I Built A Remote Antenna Switch. Performance- In this way, the RUN station uses the main antenna(s) while the Inband station is looking for new multipliers or QSOs and uses an RX antenna . Clean/de-grease the copper thoroughly using a scourer and detergent or solvent (isopropanol, ethanol/meths, acetone .). save. Other words, using the same antenna. 1 comment. but i may have just gotten lucky on that one. It also has the added advantage of shortening the overall length of an antenna significantly ,especially if more than one set of traps is used. The best you can do it to either keep the antenna/radio leads short, or use coaxial cable. Simple toggle switches will work but are far from the preferred type. 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… Switch the RF paths using suitable RF antenna relays. I was immediately intrigued. From there, a seperate feedline goes to each of the Driven Element feedpoints. First box I built inside I used RG179 to the contacts. Here is a couple of pictures of the "business end" of my antenna switch. Homebrew Open-Folded W8JK 2 elements beam Antenna 30m to 6m. The two antennas are mounted in a socalled 'X' configuration. It is working at 7,500 volts RF. It's operated by a 12V control line. It uses Glassfibre arms (a must). Traps can be one way round multiband coverage without the need of an atu. The circuit proved so popular that it was also featured in generations of the ARRL Handbook from the 1970s. 984. Place the PCB face-up on an ironing board or similar surface. Construction on this rig began in the early '80s and finished (almost) by 1990. The front panel is 17" x 7", attached to a 3"x 17" x 12" chassis for lots of elbow room. For less than $10 you can buy enough material to build two masts using his method. save. When is used alone with transceiver without PC control (CAT software, any logging software with CAT functionality), the "CI-V transceive" option in TRX setup shall be set to "ON". WA4GEG's scratch built home-brew ham station equipment. I opened up the switch and did a visual inspection. I needed to switch antennas to avoid some multipath on a couple repeaters and didn't want to run another coax. There will likely be some loss inside the relay (if you aren't using coax relays) from the impedance mismatch. The replacement? I'm building a couple of receiving antenna switches. . share. All of the copper parts are made from flattened 3/8" diameter copper refrigeration tube. a 12 volt rotator but, alas no controller. Homebrew 1kW UNIVERSAL TUNER T-type tuner design in order to make it universal with a high quality Guanella current Balun (T240-43 toroid). I've built a few in the past and they seem to work just fine. So far received 5 votes for a total score of 3.60/10 This was built with items that I collected at ham fests and a couple of proto boards from Radio Shack. 4:1 remote antenna switch bare PCB DIY cheap fit SO-239 or N-connectors. This was built with items that I collected at ham fests and a couple of proto boards from Radio Shack. This link is listed in our web site directory since Tuesday Sep 9 2008, and till today " Coax Cable Antenna Switch, homebrew " has been followed for a total of 4468 times. The front panel is 17" x 7", attached to a 3"x 17" x 12" chassis for lots of elbow room. Homebrew RX 75Ω Antenna Switch Fred #176 . Even though the logic is fast enough to catch the pulse, capacitance in the wiring, and a little residual RF, can cause a miscount. For matching the impedance of single ended antennas . Homebrew L-C-L Antenna Tuner This homebrew transmatch is similar to the design of the famous Murch Ultimate Transmatch, which is the basis for nearly all commercial transmatches in production today. 6 Number 6 screws and nuts with attached star washers 3 SO-239 coax connectors 1 DPDT toggle switch 3 Four inch RG-8X Jumpers The box bottom.. A camera is mounted inside the housing so the tuner is observed from the shack. The reason is, most antenna reed switches only switch states (off to on, and back off) for only a fraction of a second; typically less than 100 msec. This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. The clip is at the bottom of this page. The Triple-Play Transmit-Receive Switch QST October 2002, pp. HOMEBREW. Antenna Polarization Switch . come to the conclusion that the only way imma be able to keep the switch from being updated is by unplugging the wifi antenna but I was wondering if unplugging the wifi antenna would disable his ability for local play. Enjoy! Can I switch the 40/80 meter tuned transmitter antenna over to the Kenwood receiver? Then dig up three SO 239 chassis mount connectors They fit almost perfectly in the punch holes of the box. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). ACOM 2000SW 10 Port 5kW Remote Antenna Switch and 2000S Selector Console, Auto Antenna Bandswitch Interfaced with 2000A Amplifier RCU, 120 VAC, Set. . . Homebrewing Traps. Dow Key Relays were popular and cheap following WW2. The rotator has a 12v connection and a pot, but I'm not sure how the pot fits into the picture. (In this case, my receiver is a KX3). Array Solutions AS-RXFEP Receiver Front End Protector. Antenna Coax Switch. With a metal box all you have to do is wire the centre pins to the switch and not worry about the grounds as the box takes care of that. Homebrewing Traps. Borrow a clothes iron. Not bad. It covers six bands, 20m-10m on HF, and also 6m. Is it as straightforward as my drawing shows providing a metal enclosure is used for screening, a switch with a high enough current rating is used and the connections are made using copper wire that is thick enough or is there more to it than that? One inductance - a coil with taps on an iron powder toroid. Provide visual indication of which antenna is "active" and if the transverter is "active". It worked first go, with no problems. There are two-relays-in-series to each radio leg to increase an isolation. Control unit Traps simply act like a switch electrically cutting off the rest of the antenna at its design frequency, and . The knife switch is installed in the WC2XSR/13 antenna tuner. And I think that was a mistake.No, that's just fine if the shields have that common point near the switch. With the recent addition of my homebrew dummy load to the . Homebrew 1kw Mac Coy antenna tuner . originally from WalMart. 900Mhz 8640b admin ansr Antennas Arduino Boatanchor C3 Capacitor Tester Contests Dummy Load echolink ERC field day Ham-IV homebrew HW-16 HyGain IG-42 kd1jv Kenwood Kits Microcontrollers MKARS80 mmr40 PCB Fabrication portable Power Supply Programming QRP . SpugEddy said: 4)Can I use 14awg solid wire for connections or should I use short 1/2. It also has the added advantage of shortening the overall length of an antenna significantly ,especially if more than one set of traps is used. The latches are connected so that pushing one of the red buttons selects an antenna and, at the same time, cancels any other selection. It uses a single coax line to a homebrew antenna switch. Low loss, cheap, and you get to fire up the soldering iron. following info. A simple and cheap solution would be to purchase a commercial antenna switch and use the switch backwards to operate the two rigs on one antenna. This tuner can be remotely controlled with WIFI; Homebrew Magnetic loop antenna for 40 up to 10m. Originally designed for NASA for many of their 100 to 500 MHz satellite and space craft applications, the PS-2M is now used by many amateur VHF enthusiasts to . A high isolation T/R switch is essential to protect the receiver from excessive RF during transmit mode. They are still around, but need service and adjustment. 0 comments. Set it to its maximum heat and let it get hot. K9AY 80/160 Meter Switchable Loop Antenna System After operating a couple 160 Meter contests last Winter, I realized I needed to do something to improve my receiving performance. WA4GEG's scratch built home-brew ham station equipment. There is a homebrew Choke Balun at each feedpoint. The current plan is to incorporate a SixPak into the antenna switching scheme here in the KazShack. Enjoy! switch would you get? Switch is intended for use with ICOM CI-V protocol. It is a Boomless (spider quad, gem quad)design. Some have been plastic boxes and others have been metal. While copper pipe works well, DIY (Do It Yourself) steel tubing will work to. And CAT5 is small conductors, so could be too much IR drop in long runs. London. It uses the ON4AOI pcb) I built Guy ON4AOI's original design. The Parts: 1 Recycled metal data switch box painted flat black. For an initial test, I hooked it up to the famous—in my mind, at least—WB3GCK Downspout Antenna. I built a prototype today of a high voltage variable capacitor for the 40m Magnetic Loop antenna I am building. share. 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