A Quick Modification!
I recently read several articles about CHA-250B installations and realized I had not grounded the antenna as some of the articles had suggested. The CHA-250 owners manual doesn’t indicate a ground connection. I was following the owners manual when I installed the antenna. I was curious to see if it would have any effect on performance. So I bought some supplies and started the Comet CHA-250B ground rod installation. I first realized I was missing the ground connection when I found this schematic on the G8JNJ website:
The ground wire is connected to the coax shield using a hose clamp. The copper wire under the clamp is doubled over, to make better surface contact. An idea I got from K3DAV’s website.
All connections to the copper ground rod were doubled over, and clamped, to create more surface contact I’ve had success with the clamping idea, so I used those clamps again.
I run FT8 using a Flex 6500 barefoot into the CHA-250B. It puts out 86 watts. The CHA-250B does not disappoint! Over the past two days I have worked JA, UA0, 9Y, SP, OH, VK, UT, and KH6! Just to name a few! I now have thousands of FT8 contacts across 6 bands!
The antenna is a bit quieter, noticeably so on 30m, and the SWR is roughly the same on all bands. I can’t claim any big improvements. Static charge build-up, caused by high winds, will go to ground. Installing the Comet CHA-250B ground rod was definitely a worthwhile endeavor.