DB224... no access to the antenna. We got to live with it as it is ... just trying to make the transmitter happy till a time comes when we can either tweak the antenna or replace it.
Thanks , dave ----- Original Message ----- From: allan crites To: [email protected] Sent: Sunday, May 09, 2010 10:13 PM Subject: Re: [Repeater-Builder] Commercial VHF antenna on 2m Dave, Is this a 154 MHz colinear antenna you are wanting to use on 146 MHz or one like a DB 224 with 4 exposed dipoles? If the 4 exposed dipole type, just what makes you suspect that there is "a lot of loss" when an antenna made for 154 MHz is used at 146 MHz and how do you expect to tune the dipoles without compensating for the harness impedance matching sections mismatch also. Allan Crites wa9zzu --- On Sat, 5/8/10, WA3GIN <[email protected]> wrote: From: WA3GIN <[email protected]> Subject: [Repeater-Builder] Commercial VHF antenna on 2m To: [email protected] Date: Saturday, May 8, 2010, 11:13 PM Hi folks, Several weeks ago I posed the question of using a Commercial VHF antenna that was resonant on 154Mhz on 146.745Mhz. We tried it today. The SWR was a bit over 2:1 on the repeater freq. We installed a T connector after the cans and used an open stub to try to match the line...got it down to 1.5:1, wouldn't go any lower. We think the height of the antenna makes up for what we suspect is a lot of loss in the antenna. The previous location of the repeater antenna was 100ft ASL and this location is 525ft ASL. Maybe one day we'll get a chance to retune the four dipole antenna. Thanks to all that provided ideas for this project. 73, dave wa3gin
