Comet CHA- 2. 50. BX - N6. PET - My Ham Radio Journal. Posted by N6. PET - Pet Natividad on Nov 9, 2. Comet Ant Analyzer; Power Supplies. Switching Power Supplies; Coax Switches; Dealers; contact us; warranty; N A V NEW! Order #2396 List Price: $469.00 Your Price: $439.95. Amateur Antennas : The Comet CHA250B broadband vertical antenna will amazingly cover 75/80 meters through 6 meters with no gaps! COMET CHA-250B Vertical base antenna for 6m-80m, 24ft. Sold by America's Largest Independent Ham Radio Dealer! More items related to comet cha 250b antenna. Advance Electric & Relay Co. 21B090 28 VDC 250 Watt Antenna Dow. To fully familiarize yourself with the CHA—250B. Also, please keep this manual in. CHA-250B Broadband GP antenna Instruction and assembly manual. 4-18-2 TSUJI, MINAMI-KU. Review ? Is it really necessary to have ground radials, traps, counterpoise elements, reflectors and directors on antennas to provide usable communications? Even better, what if an antenna never needed tuning or adjustment on any frequency in the HF spectrum? Comet Antennas has a CHA- 2. B HF vertical antenna a straight, aluminum pipe with no parasitic elements, designed for continuous (no gaps) transmit coverage from 3. MHz (claimed voltage standing wave ratio less than 1. MHz (claimed VSWR 3: 1 at 1. MHz). Its power- handling capacity will accommodate most any conventional HF transceiver 1. AM/FM/CW) and 2. 50 watts single side band. A hermetically- sealed matching unit at the base is affixed with a standard SO- 2. PL- 2. 59 terminated coax cable. This lightweight antenna (7 lbs.) is 2. Released their new CHA-250B HF vertical antenna – a straight. Comet CHA-250B Broadband Vertical Antenna By Bob Grove W8JHD. For additional information on the Comet CHA-250B HF vertical, contact NCG Com-. MPH without permanent deformation. Nonetheless, it’s going to sway in the breeze! Another HF antenna, really ? Many might be wondering why I would need another HF antenna. I purchased this antenna for 4 good reasons. He must have a good reason and there’s only one way to find out. I also have to admit that there is a 5th reason that probably sealed the deal. This antenna has always been pricey for what it is. It’s listed at $4. HRO + tax. A hundred bucks more could get me a better performing GAP antenna. Then again, the simplicity and no- radial design has always caught my attention for my apartment living situation. I told myself, for maybe half the price I can consider getting one. Well, what do you know? A brand new in a box CHA2. Bay. Unfortunately, it ended without reaching its seller’s reserved price. Although I was the highest bidder, I was only willing to pay $2. Surprisingly enough the seller offered me a “second chance” to buy it for the price I bid for. Perfection ! The antenna arrived today and there’s no time to waste ! The Specifications. Electrically, the vertical element has the following lengths: 3. MHz 0. 0. 84. Hole alignments are accurate and burr- free; the entire assembly procedure takes about 1. Measurement unit is in metric/mm when determining how much length is needed to be inserted so be prepared to do some conversion if you don’t have a cm or meters on your ruler . The Two husky U- clamps allow the antenna to be attached to any mast pipe of up to nearly 3 inches in diameter. The instructions are very straight forward and clear. This is probably the simplest antenna I have ever assembled for HF that covers such a broadband, and the best part is that there is no tuning required! You start with the base unit element (1) by inserting element (2) inside it with the specified length of 2. Move on to inserting element (3) inside element (2), which is easily guided with 3 holes for the 3 wing nuts. Now grab element (4) and insert it 1. The final element (5) inserts to (4) and with a 2 ring clamp that screws through the element pre- drilled holes. Now knowing this simple procedure before hand would take me less than 5 minutes next time I need to re- assemble this on the field. That’s it, you’re done and ready to install this puppy on a mast. Manufacturer recommends that the antenna be installed to a mast 3. Until then, this will do. I was totally blown away with the results! Majority of the bands (6m- 8. SWR, except 4. 0m, which climbed as high at 1. SWR at 7. 2. 5Mhz, which is still amazingly good. I didn’t waste any time screwing in my PL- 2. This is also why I never was able to document or video the antenna analyzers result while I was sweeping the bands. I wanted to make sure I don’t over drive the antenna with more more than it can handle by plugging it into the Yaesu FT- 4. D (1. 00w). This radio uses an LDG AT- 1. Pro. II with an interanl A/B switch antenna. I have the Ulitmax DXtreme 5. First test was setting the LDG to bypass and the FT- 4. ATU off. SWR went up a bit but still within specifications, below 1. I checked every band and was surprised that I was able to tune it for 1. ATU. Although no tuner is required, the LDG ATU automatically kicks in when SWR goes beyond its 1. I see some band edges are measuring at 1. Enough of the SWR findings, now on to some QSOs. Comparing Comet CHA- 2. Vertical VS. This is unusual since generally horizontal or sloped orientation performs better with 2. This tests shows the CHA- 2. Georgia station (1,9. S2- S3 units better than the Endfed 5. Another very impressive observation I had was that the CHA- 2. B had an SWR below 1. This video demonstrates that. My Thoughts. Although not a competitive DX antenna, and with the full understanding that more cumbersome antennas have better performance, there are applications for the CHA- 2. B. Its full- HF, continuous- frequency- coverage capability without tuning or adjustments, light weight, minimal composition, ease of assembly, and no power- supply requirement like that of active antennas, make the Comet antenna appealing for Field Day, emergency deployment, portable operating, DXpeditions, low- profile receiving and two- way installations, local HF communications, and scene of disaster communications. Reviews. I have read mixed reviews about this antenna. Again, just like anything you read on the internet, this being an exception . People either love it or hate it. This really depends on your expectations. This is no miracle antenna that will outperform a 3- element Yagi nor Titan DX GAP antenna. It has its limitations but the 3 biggest thing I really like about this antenna is its simplicity in design, quick assembly and broadband capabilities. A HF vertical is perfect for DX or stations beyond 3. Now I can easily switch between a horizontal, sloped, and vertical polarization. Besides e. Ham’s review, below are three other publications ( QST, CQ Magazine & Practical Wireless) you can read more on and decide if this is an antenna you will be investing on. Good luck and 7. 3s! QST Magazine Review. February 2. 00. 6CHA- 2. QST- Review. CQ Magazine Review. June 2. 00. 5CHA- 2.
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