$29.95 Buy It Now or Best Offer
free,30-Day Returns
Seller Store radiodan-w7rf
(14352) 99.7%,
Location: Fort Collins, Colorado
Ships to: US,
Item: 325869783066
All returns accepted:ReturnsNotAccepted
Compatible Brand:Universal
Non-Domestic Product:No
Custom Bundle:No
Band:HF
MPN:1:49 49:1 EFHW
Compatible Product:FIeld or portable,SOTA,Base station
Bundle Listing:No
Modified Item:No
KM4CFT:KM4CFT
Type:Antenna matching transformer
EFHW unun kit:EFHW unun kit
Frequency Band(s):HF
Country/Region of Manufacture:United States
Back in stock and shipping on the same or next day orders received! Tnx to all the Youtubers (and others) who reviewed and showed videos enjoying their KM4CFT EFHW and EFRW antenna implementations. TNX to all of our supporters! C U on SOTA, POTA and anywhere fun QRP can be had! NOTE: POSTAL INCREASES COMING (AGAIN) January 21, 2024! Thank the USPS for this! This has been a VERY popular kit and well reviewed by Thomas K4SWL of QRPER com. See Youtube videos (search for “KM4CFT) made by various users and their installations. Over 200 sold at this writing! So, if you’re wondering if this is the one to buy – YES, it is well loved in the QRP community. This is the KM4CFT End Fed QRP unun kit, very small (1 7/8″L x 5/8″W and very light (0.4 ounce)! Look at the pictures to see how small this truly is. Perfect to add to your QRP radio adventures! Perfect for SOTA, POTA, backpacking or just seeing what you can work in a minimalist way. You build this kit to feed your EFHW (End Fed Half wave) or EFRW (End Fed random Wire) antenna depending on how you build it (instructions for both ways build in manual)Want qty 10+ at a discount for your club project? See —>>> https://www.ebay.com/itm/325870942685 Easy to build KIT. Complete Instructions at radiodan.com/pdf Power rating : 10 watts SSB, 5 watts CW/digital . Discussion of unun use: Antenna TypesThis antenna unun kit is designed to be built for one of the two types of end fed antennas described below: End Fed Half WaveThe End Fed Half Wave (EFHW) is known as a resonant antenna. This means it is designed to be usedwithout an antenna tuner. They are designed to be resonant on half wave multiples of its resonantfrequency. So an 80 meter EFHW is (theoretically) resonant on the 80, 40, 20, and 10 meter bands. Thisisn’t completely true though since the bands aren’t exactly multiples of each other. To remedy this, youcan use a loading coil along the wire to bring other bands into resonance. However, many users find trimming the antenna for best SWR on the lowest half wave band will work well enough on even multiples. These antennas should bedeployed in the same fashion as a dipole, sloper, inverted vee, or even vertical if you use a feedline of at least 10 feet (longer is better as the shield of the coax can act as a counterpoise. A short counterpoise can be added on the “ground” wire, usually 5-15 feet is fine. Some users only use the coax shield as the counterpoise. It is absolutely amazing how well this. works! While giving away many dB in QRP power, at least the antenna is worthy of that QRP power! Make every milliwatt count! End Fed Random WireThe End Fed Random Wire (EFRW) antenna is not resonant and is designed to be used with an antennatuner. The antenna is essentially designed to be equally “out of tune” on a large range of frequencies,such that a tuner can be used to bring the antenna into a match, and therefore be usable on many bands.This is a great option for radios that have a built-in ATU like the Elecraft KX2, KX3, KH1 and theXiegu X6100 and X5105. With this type of antenna, you want to prevent the antenna from beingresonant on any particular band. For finding the length you want, I recommend looking at an articlethat the University of Delaware posted. It can be easily found by doing an internet search for “End fedrandom wire antenna lengths” Manual at radiodan.com/pdf Quarter shown for size comparison and not included
Frequently Asked Questions About End Fed Half-Wave EFHW QRP antenna unun kit EFRW End Fed Random KM4CFT 200 sold! in My Website
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