----- Original Message ----- From: "Les Rayburn" les@highnoonfilm.com To: "AMSAT Mailing List" amsat-bb@amsat.org; starcom-bb@star-com.net Sent: Friday, October 04, 2013 4:18 AM Subject: [amsat-bb] Crushcraft A144-10T "VHF Twist" Antenna
I just acquired a "new" in the-box, never assembled Crushcraft A144-10T "VHF Twist" antenna. It includes the cabling to allow the user to select left or right hand polarization. My questions are numerous:
1.) How is the performance on this antenna, compared to more modern designs?
Hi Les,N1LF from Domenico, i8CVS
1) I have used the A144-10T since 1973 and compared to modern type it works no so well because the phasing harness to switch polarizations uses crimped PL connectors and you get water and humidity into it.
2.) If I were going to install it inside my attic, should I chose left or right hand polarization?
2) To switch between RHCP and LHCP you must screw and unscrew by hand the phasing harness connectors and since the antenna is not equipped with a polarization switching relay you have not the time to switch polarization while operating the satellite.
3.) Any caveats or things to watch out for?
3) Do not use the above Cushcraft A144-20 T for the above reason. Buy a modern model of crossed yagi with polarization switching relay between RHCP to LHCP possibly from 2M
Any information that could be provided would be great. I was thrilled when a friend stopped by and asked me if I'd be interested in the antenna. Good price too.
I understand a good price because it is a old model of antenna wich designe is almost back 30 yars ago. BTW the aluminum is a good quality and witstand on the environment for many years.
-- 73,
Les Rayburn, N1LF 121 Mayfair Park Maylene, AL 35114 EM63nf
6M VUCC #1712 AMSAT #38965 Grid Bandits #222 Southeastern VHF Society Central States VHF Society Life Member Six Club #2484
Active on 6 Meters thru 1296, 10GHz & Light
73" de i8CVS Domenico