I was hoping that Burt would chime in. Chuck WB2EDV
----- Original Message ----- From: "Burt Lang" <b...@gorum.ca> To: <Repeater-Builder@yahoogroups.com> Sent: Sunday, November 15, 2009 11:57 AM Subject: Re: [Repeater-Builder] Re: Building Low Band Loop Antennas (DB-212) > The low-band loop from Sinclair (SRL 110) was not nearly as wide band as > the Hi band (SRL210) and UHF models (SRL310). The latter were designed > to be mounted either half wave or quarter wave from the tower or mast. > In the case of the low band loop a half wave would have put the loop 10 > ft from the mast, which would be structually unsound. The SRL110 were > normally mounted about 3 ft or so from the mast which is 1/8 wave. This > would result in a lower impedance (<200 ohms loop impedance) requiring > 93 ohm coax as an internal matching transformer (the SRL210 and 310 > series use 125 ohm matching coax). It also would be much more sensitive > to spacing from the mast or tower. > > At least that has been my experience with the low band loops. > > Burt VE2BMQ >
