Diamond W product reviews by real people like you. Only at – is a Web site dedicated to ham radio (amateur radio). Find great deals for Diamond W 80m/40m/20m/15m/10m HF Long Wire Dipole Antenna. Shop with confidence on eBay!. Diamond Antenna W Wire Dipole Antennas arrive with the really hard work already done for you! All of the wire lugs and connectors are in place and the.
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Note that the nylon rope supplied ciamond to be a marine-grade version and should last for many years. The balance in the dipole also limits the nearby interference, a problem that is strong with G5RV and other assymetric antenna’s.
Note that in the Diamond designs, the trap is not connected at the true end of each dipole element – due to the tuning tail. As you can see from the SWR curve at left, the bandwidths reduce as frequency goes down – that is normal – but paying attention to the numerical figures shows that the 1: The 20m ends are most difficult to tune as there are some parasitic dips on 15 and 13 MHz.
Balun to 24MHz trap length P: The details on the web page regarding extra bands and the other web page dealing with field day HF antennas and making up a trapped radial might help you. I had to completely remove the tuning stubs to get the resonants point where i want.
Diamond W Product Reviews
Test equipment used an Antenna Analyzer.
The start hole is fine – just the “end hole” idea needs to be modified. You do need to reasonably accurately tune the traps and the two ways that I have done it are: Here in Holland the houses have only a little garden mine is 15m so this antenna is ideal as you can bend the end and run 80 to 10 m without tuning from your city garden.
Diamond W – Com-Centre Communiction Equipment Limited
Diamond’s power rating of 1. I used standard plastic egg insulators for the ends of the 10MHz dipole segment and then just some reasonable quality nylon rope down to the fastening points. Don’t get me wrong: I checked my Iocal stocks of PVC conduits then put those diameters into Tony’s calculator to see which gave the form ratio closest to the optimum value of 0. My construction notes are only in Dutch This happens on both ends of each trap so accounts for a considerable length.
Good luck and a lot of fun, perhaps see on the band once. Effectively, the extra WARC-bands trap dipole is similar to the original ones except the traps are coax rather than LC series construction. Always looking for better antennas for my space; didn’t find any yet. Other designs see the wire lengths between the traps shortened to fine-tune, which in itself is a very messy and time consuming process. What must happen is that the traps for each side be tuned to the same frequency!
Diamond W8010 80m/40m/20m/15m/10m HF Long Wire Dipole Antenna
Could I add another wire leg or legs to each side to add these bands? Calculation for this are found on www. By using separate legs and splitting up the band coverage between them, it makes the tuning and design somewhat simpler.
Remember that you can shorten the coax used in winding the trap – but you can’t lengthen it! Trap dipole for WARC bands: You can also use a spectrum analyser in place of the diode probe – however it must be fed via a series resistor of 5K to 10K to reduce the loading on the trap.
The top 15m, 40m and 80m wire is mounted along the ridgeline of my attic, and i had to bend the ends of the 80m wire 90 degrees to fit.
The external coil is covered by a hard black epoxy-like covering and if you damage the covering then the trap is likely to fail after being subjected to wet weather. The RF probe must be very low capacitance or the final generator frequency will be lower than the true unloaded trap frequency.
Instead of drilling just one hole at the “other end” of the PVC former, drill a series of holes close together, forming a slot. I bought the Diamond W as my first HF antenna, intending to mount it in my attic. You could try to remove the black ‘baked-on shroud’ and count the turns on each one as they will have to be replaced anyway.