Comet SBB-5NMO 2M/70cm Dual Band Mobile Antenna
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No, the whip's base does not have a spring. Because of the loading coil in the center of the whip, the antenna can bend slightly. There is also a pulley on this antenna. fold up and up- Allows for low ceilings in a garage by using the over feature. SS-Comet is a comet that orbits the Earth. The base of the 680SBNMO is springy. Check out that antenna, if that's something you're interested in.
Yes, but there will be a lot of SWR. You could always trim it down to 151-inch length. 155, but the SWR for 2m and 440 would be ruined.
Yes, they are, in my opinion. By the way, it's now been three years and is still going strong. It appears to be an excellent antenna - Mechanically and electrically, it's at the top of its game. It's also very sensitive to simplex communication over long distances (around 40 miles).
Not in my case. NMO mounts that fold over are available.
Selected User Reviews For Comet SBB-5NMO 2M/70cm Dual Band Mobile Antenna
I don't have a lot of time to use the antenna, but I did a SWR analysis and attached the results. Basically, it's around 1. The antenna was not adjusted (tuned) in any way. On my unit, these are the stock readings. The values are satisfactory, but they could be improved. br>The NMO mount was my first choice. Because the NMO mount has a low profile, I had to adjust my mount to catch enough threads to keep it secure. br>The folding mechanism isn't very good, so I won't be using it. I'll simply unscrew as required. br>I like the size; it's just over a meter long, so I can store it in my trunk when I'm not using it. If you're going to use a magnetic base, I recommend using either 5 or 6. 5" (also known as a tri-) magnet. My 3. The 5" base is just about adequate.
I use this on my NMO mount all the time and have yet to jacked anything up. The vehicle performs admirably on the highway at 80 miles per hour. However, it has a loud profile and can be heard at speeds of more than 30 miles per hour. I have excellent SWR and can hear clearly for miles when using a 50W Yaesu. I've heard receivers crackling through in the mountains from over 50 miles away.
Right out of the box (plastic sleeve), this antenna performed admirably. With a little tinkering, I was able to increase the SWR @144mhz from 2:1 to 2:2. From one to one, Because I use APRS rather than CW or SSB, I was only interested in the lower frequencies in the 2M band. The SWR is at one at the point where repeater frequencies begin (145mhz and up). 1 (or higher). br>The SWR on 2M was between 1. 1 to 1. The SWR ranged from 1 to 70CM. 1 to 1. 1 (for frequency performance, see the accompanying charts). A truck mirror antenna mount is used to mount this antenna on a roof rack cargo basket. To make a good electrical connection for the ground plane, I didn't want to scrape the powder coating off the basket. So I went with a 1/2 wave antenna because they don't require a ground plane and it has a lot of positive reviews on Amazon. I'm satisfied with this antenna based on the nanoVNA results and performance thus far.
Just like the rest. My bike has an NMO mount on an aluminum extension from the luggage rack, so I'm bicycle mobile n0eq- The structure appears to be of adequate quality. The whip isn't very "springy," which is a good thing for bicycles. While bouncing through the trails, you don't want a springy whip "whipping" you in the back of the head. Without the use of tools, the "Tilt Over" feature is nearly impossible to use. To get the thing to pull out far enough to fold, I had to mount it in a vise. In terms of RF performance, it is identical to any other half-wave antenna. Some hams appear to be perplexed by this. No half wave "outperforms" another half wave, and every 2m antenna is also resonant on 440, making them all dual band.
SWR is a little bit high. I'm in the middle of a two-year project. On 446, it's 08 SWR. between a thousand and one On 146, there are 83 SWRs. 520 I wanted to use this antenna for GMRS as well, but with an SWR of 11, it's not possible. yikes. Fortunately, I did not cause any damage to my radio. For GMRS, I'm experimenting with a 6db midland antenna. I'm not sure what I'll use as a dualband antenna, but I might be able to find something similar. Because another antenna at the same mounting point received a 1, I know it's the antenna. 06 SWR.
259 end. What I got was an antenna with a NMO connection, which isn't a big deal, but it means I'll have to buy a new coax cable and re-install the antenna. Rerun the entire process. The antenna appears to be of good quality and solid construction, but I cannot comment on its performance because I am unable to mount it on my vehicle until I obtain the necessary parts.
road. It worked fine until I went off road and the unit broke in the first 15 minutes of a four-day trip at the hinge pin. This isn't the antenna for you if you want to make contact with it with anything. It was fine as long as I was on the highway or in my driveway at home.
It's quite effective. This antenna works well for my repeater use on 2 meters, which is what I mostly use. The black finish, as well as the pull-string closure, are appealing. over. For my needs, this is a good height. Getting a good, clean signal and successfully connecting to the repeaters. br>I intend to/would purchase another. br>br>Recent changes - After a couple of days on the road, I double-checked my SWRs. This time I wrote them down: (Can't complain)br>br>144. 0 > > 4
144. 5 > > 3
145. 0 > > 1
145. 5 > > 0
146. 0 > > 0
146. 5 > > 1
147. 0 > > 2
147. 5 > > 2
148. 0 > > 3
148. 5 > > 4
149. 0 > > 5br>br>It's still a good business.
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