2024 Efhw swr

Efhw swr

Author: lmbn

August undefined, 2024

WebThe EFHW transformer box from outside. One cable is the coax feedline, the second is the supply to the cooling fan and control of relays. The 1:64 transformer is wound on 3 stacked FT240-52 toroids, this provides same. inductance as one FT240-43 and is able to withstand 1kW 50/50% duty cycle with help of a cooling fan... WebEFHW high SWR. I have created an efhw antenna with a 49:1 transformer and 34.7 feet of speaker wire and used 3 feet of RG316 coax. The coax is turned 9 times around a ferrite …

Antenna Challenge #2: K6ARK End-Fed Half-Wave paired with

WebMay 6, 2024 · This is a reading from my RigExpert AA-35 ZOOM of my EFHW 40-10 inverted L with radials, and feedpoint 2 feet above the … WebEFHW antennas MyAntennas.com 40415 Chancey Rd, STE 105, Zephyrhills Florida 33542, USA 3 Installation Tips Weather you bought one of our multiband models like the … indian mirrored pillows

EFHW high SWR : r/amateurradio - Reddit

WebEFHW high SWR. I have created an efhw antenna with a 49:1 transformer and 34.7 feet of speaker wire and used 3 feet of RG316 coax. The coax is turned 9 times around a ferrite core which helps with the SWR however I still get reflected power in the antenna. Im not sure what im doing wrong with this antenna. does anyone have any suggestions? WebJan 24, 2024 · The EFHW (end fed half wave) needs to be classified as a specific case of the class of end fed wire antennas. ... With my installation, a ground rod was excellent to sufficient for most bands and 2 rods were slightly better for SWR. You may try adding additional .25 counterpoise wires for problem bands if you really don't want to use a … WebWant to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content. Link to this page: locating property boundaries

Multiband End-fed Half-wave EFHW Antenna

WebThe EFHW performs similarly to a resonant, half-wavelength dipole on 80 meters, radiating best broadside to the antenna. As long as the impedance at the end of the antenna is suitably high, the SWR will be low enough to be used on the higher HF bands without an antenna tuner. As operating frequency WebFeb 24, 2024 · All I need to see is the MyAntennas EFHW SWR graph. Probably 99% of users think it's great. But consider this: any time we see successive SWR peaks diminish with an increase in frequency, the reduction in SWR is attributed to loss. In the case of the MyAntennas (and typical of all toroid transformer EFHW designs), that represents … locating property corners for salehttp://www.vibroplex.com/techdocs/EF/ALLBAND_KW_MANUAL.pdf indian mirror cloth

"WebIssues with high SWR on HF Kits EFHW 49:1 UnUn kit. I recently tried assembling a EFHW kit, and some problems came up in testing. I believe this is the kit; I bought it through … " - Efhw swr

Efhw swr

WebFeb 14, 2024 · A VSWR sweep of the unun after adding a 100pF capacitor shows an SWR <5:1 from 160M to 10M. In theory, my LDG Z100 Plus autotuner should be capable of matching the impedance of this 49:1 … WebMay 27, 2024 · SWR for 80-10 meter EFHW with no capacitor SWR for 80-10 meter EFHW with 100 pfd capacitor The above data from K1RF shows that the SWR for 20 meters (my dark red markings - SWR scales differ in …

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WebMay 4, 2015 · Also, I use an ALS-600 no-tune amp and having an antenna with low SWR on multiple bands makes operation convenient. The EFHW-8010 can easily handle the …

WebAug 12, 2024 · W9HJ QRZ Lifetime Member #294 Platinum Subscriber Life Member QRZ Page. Here is a little comparison between my homemade Terminated End Fed antenna and a traditional EFHW antenna. The difference in receive signal is night and day different. Also, contrary to popular opinion, transmitting on it is good also. I've gotten over 22,000 … WebFeb 28, 2024 · Our Low band transformers for 1.8-8Mhz such as MEF-105-5K, MEF-107-4K, and MEF-107-2K-Plus feature insertion losses of only 0.07-0.25dB. For increased power handling on digital modes such as FT8, we developed also a MEF-330-2K-Plus transformer for 3-30MHz with an average loss of only 0.47dB. See some of our Insertion loss charts …

WebThe new antenna is great and I can use 40 & 15 without any tuner, SWR is under 3:1 on all non-WARC bands. The biggest performance difference is on the 30 meter band on both receive and transmit the random wire outperformed the EFHW by a lot. Now the 30m band even sounds very muffled and my signal barely gets out according to the RBN. WebMar 21, 2024 · Issues with high SWR on HF Kits EFHW 49:1 UnUn kit. I recently tried assembling a EFHW kit, and some problems came up in testing. I believe this is the kit; I …

WebMar 29, 2024 · Adam includes instructions for building an EFHW with a counterpoise, without a counterpoise, or a random wire antenna. The coil can be configured as a a 49:1 Unun, 9:1 Unun, or 1:1 Balun. ... Since I configured the K6ARK kit as a counterpoise-less EFHW, I wasn’t entirely sure how stable the SWR would be in the field. For this reason, I … indian minted cucumber salad recipeWebReviews For: MyAntennas EFHW-4010 4-Band End Fed Dipole Category: Antennas: HF: Verticals; Wire; Loop. ... 40M resonated near 7.0 MHz and 20 and 15 exhibited under 2:1 SWR throughout each band. On 10 the 2:1 SWR bandwidth covered from 28.0 to 28.9 MHz, so I stopped there. On 40 I can go up to 7.3 MHz and be right at 2:1 so basically all … indian mirror newspaper upscWebThe EFHW performs similarly to a resonant, half-wavelength dipole on 80 meters, radiating best broadside to the antenna. As long as the impedance at the end of the antenna is … indian mint yoghurt dressingWebItem Details: The advantage of an EFHW is the ease of construction, it’s versatility in a variety of installation configurations (sloping, horizontal, L, etc.), no tuner is needed, and this one works on 4 bands: 10, 15, 20, and 40 meters. We chose a 250-watt rated antenna so you can comfortably transmit the full... View More. Tel: 1-860-594-0200. locating property ironsWebUnlike the dipole antenna, which is comprised of two quarter-wavelength wires and fed at its center, the EFHW is a half-wavelength antenna with the coaxial cable for your transceiver attached at one end. It has become … indian mirror newspaper editorWebJun 6, 2024 · A capacitor across the primary is recommended f or EFHW antennas operating at multiple half wave harmonics. The capacitor significantly improves minimum SWR and 2:1 SWR BW. The flattening of the SWR curve above 20 meters is significant with largest effect at 10 meters with a 100 pfd capacitor. indian mirror founderWebMar 26, 2024 · The fact that you're hearing more "stuff" on the EFHW could actually imply it's more sensitive. I was simply pointing out that a 20M EFHW should not have anything remotely like a nice SWR on 40 or 15. When I run a 20M wire on my 49:1 ununs (one commercial QRP, one home-made for high power), the SWR is over 30:1 on 40 and 15M. locating property lines with iphone