开云体育For temporary, I would just install a Comet GP3? dual band antenna.? We had one at about 250 ft for 30 yrs with no problems in operation.? When our DB224 antenna failed we moved the repeater over to the comet GP3 diplexed with a UHF link and it played just fine for 10 years until we could fund a climb. The replacement for the db224 was a Telewave with both VHF and UHF loops on the same mast. ????? ? John Lock KF0M Kf0m@... ? From: [email protected] <[email protected]> On Behalf Of Bill Davis AE via groups.io
Sent: Monday, March 31, 2025 7:51 AM To: [email protected] Subject: [repeater-builder] Antenna Thoughts and Suggestions ? We are a new ham radio club (RRARC) in TX with currently 60 members living in a 55 and over retirement community.? As you can imagine, we are tightly governed by HOA rules.?? ? We are about to install our repeater on the roof of the community clubhouse.? The clubhouse is on a hill with line of sight to the north and east approximately 8 miles.? To the west and south approximately 25 miles. ? Being new, we do not have a repeater pair allocation yet.? Currently we are operating crossband, receiving on 144.650 and transmitting on 441.350.? These are test frequencies until we can get a permanent installation site and do some ERP mappings in order to request a frequency allocation.? Currently we are operating on a dual band antenna using a diplexer and a Yaesu DR-2x repeater. ? Here is the question and our plan.? Since we will get one shot at antenna installation, we plan to install a Kenwood DB-408-B (450) antenna.? It is 8' 5" tall.? We plan to remove the top plug and install an ARX-2b Ringo on top.? It is 12' 5" tall.? We plan to receive on the Ringo and transmit on the DB-408.? This will be a temporary solution until we and do site surveys on both 440 and 2mtr in order to request our allocation. ? Looking for opinions on how well this temporary crossband setup is going to work, using the top antenna for receive and the bottom for transmit with no diplexer since we'll have dual feed lines, and using the vertical stack to negate some desense.? We will be likely using 20 watts. ? ? TIA ? Bill? kg5ie ? ? |
