[BVARC] Comet CHA-250B mistake
Bill Hornbeak
k5gjq.40 at gmail.com
Fri Apr 16 17:01:47 CDT 2021
Comet CHA-250B now available if anyone is interested in checking it out.
Very simple to set up.
Bill - K5GJQ
On Fri, Apr 9, 2021 at 7:17 PM Jack C via BVARC <bvarc at bvarc.org> wrote:
> Hey Bill:
>
> I have one of those Comet CHA=250B antennas also.....
>
> Right now it's on a 10' mast on the back of my house. I also have a off
> center dipole on my wooden fence and it is quieter and hears better than
> the Comet.
>
> Right now I'm feeding it with 8X coax. I can't go up 35' since it would
> require guying that I don't have room for.
>
> My plan is... I am going to ground mount it and run radials (as many as I
> can in my small back yard) and I purchased some LMR 400 UF from ABR to feed
> it. Other factors involved in all of this, one of which is totally ripping
> my communications room apart and moving PC and HAM equipment to different
> places and rerouting coax though the attic.
>
> I did email Comet to verify the max wattage on digital and they said 75
> watts, the paperwork says 60 watts. They said that is the number one
> failure for this antenna is too much wattage.
>
> I will set it up as described, if that doesn't work I'll shop for
> something different. The powers that be say that radials are key to any
> antenna and I'm about convinced of that.
>
> Friends are recommending Hustler antennas but they admit they are a pain
> to tune. Zero Five antennas makes a multi band 10-40m that has radials
> (sort of like the old CB verticals). It is non resonant so requires a
> turner but got good reviews... we'll see.
>
> I'll keep you updated.
>
>
> On 4/9/2021 4:49 PM, Bill Hornbeak via BVARC wrote:
>
> I sadly purchased the above antenna, hoping to be able to have a little
> better reception/transmission than I currently have. My area is restricted,
> with only a backyard (20'x50') available. There's a huge live oak situated
> in the center and two feet from the fence which doesn't help with
> deployment. Ground radials are not feasible.
> The antenna as per spec provides a very low SWR across all bands without a
> tuner. There are background noises from 160m to 20m at which point it goes
> deaf and mute 17m to 6m. On the Monday night 10m net I can barely hear or
> be heard by a HAM about 5 miles away.
> So if any of you adventurous souls have a hankering to try something new
> as soon as I've replaced it (very soon) it will be available to try out.
> Just contact me.
>
> Notes:
> 1. Recommended height is 35' and I have it at 20', manufacturer's email
> (available) told me that even at 20' it should respond better.
> 2. Same email from the manufacturer indicated it uses the coax shield and
> recommended 50' to 100'. So I added length and found no changes.
> 3. Decided to try 4 radials 12' to 15' long attached just below the coax
> termination and stretched out (angled down), also resulted in no changes.
>
> Bill - K5GJQ
> --
> vs: Habakkuk 3:17-18
>
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>
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--
vs: Habakkuk 3:17-18
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